Raspberry Pi KMS-only driver

Raspberry Pi KMS-only driver

[Eric Anholt]

Here's the first patch series for graphics on the Raspberry Pi.  It
brings up fbcon on KMS, and the xf86-video-modesetting driver runs so
you can do X with no further userspace drivers.

Right now this series doesn't support changing video modes away from
the firmware boot setup, because when I set the pixel clock using the
rpi-dt-clocks series I end up with a black display. even on no-op
modesets.

I've dropped all of the 3D bits from this series, to simplify this
review stage.  See vc4-kms-v3d-rpi2 for a series that works with the
current Mesa driver, based on downstream 2709.  I squashed all of my
messy KMS series down, but kept Derek's patches separate to make sure
he gets credit.

This code can also be found at:

https://github.com/anholt/linux/tree/vc4-kms-squash

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Eric Anholt]

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 .../devicetree/bindings/gpu/brcm,bcm-vc4.txt       | 83 ++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt

diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
new file mode 100644
index 0000000..2b13e61
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
@@ -0,0 +1,83 @@
+Broadcom VC4 GPU
+
+The VC4 device present on the Raspberry Pi includes a display system
+with HDMI output and the HVS scaler for compositing display planes.
+
+Required properties for VC4:
+- compatible:	Should be "brcm,vc4"
+- crtcs:	List of references to pixelvalve scanout engines
+- hvss:		List of references to HVS video scalers
+- encoders:	List of references to output encoders (HDMI, SDTV)
+
+Required properties for Pixel Valve:
+- compatible:	Should be "brcm,vc4-pixelvalve"
+- reg:		Physical base address and length of the PV's registers
+- interrupts:	The interrupt number
+		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
+
+Required properties for HVS:
+- compatible:	Should be "brcm,vc4-hvs"
+- reg:		Physical base address and length of the HVS's registers
+- interrupts:	The interrupt number
+		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
+
+Required properties for HDMI
+- compatible:	Should be "brcm,vc4-hdmi"
+- reg:		Physical base address and length of the two register ranges
+		  ("HDMI" and "HD")
+- interrupts:	The interrupt numbers
+		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
+- ddc:		phandle of the I2C controller used for DDC EDID probing
+- crtc:		phandle to the pixelvalve CRTC the HDMI encoder is attached to
+
+Optional properties for HDMI:
+- hpd-gpio:	The GPIO pin for HDMI hotplug detect (if it doesn't appear
+		  as an interrupt/status bit in the HDMI controller
+		  itself).  See bindings/pinctrl/brcm,bcm2835-gpio.txt
+
+Example:
+/ {
+	soc {
+		pv0: brcm,vc4-pixelvalve at 7e206000 {
+			compatible = "brcm,vc4-pixelvalve";
+			reg = <0x7e206000 0x100>;
+			interrupts = <2 13>; /* pwa2 */
+		};
+
+		pv1: brcm,vc4-pixelvalve at 7e207000 {
+			compatible = "brcm,vc4-pixelvalve";
+			reg = <0x7e207000 0x100>;
+			interrupts = <2 14>; /* pwa1 */
+		};
+
+		pv2: brcm,vc4-pixelvalve at 7e807000 {
+			compatible = "brcm,vc4-pixelvalve";
+			reg = <0x7e807000 0x100>;
+			interrupts = <2 10>; /* pixelvalve */
+		};
+
+		hvs: brcm,hvs at 7e400000 {
+			compatible = "brcm,vc4-hvs";
+			reg = <0x7e400000 0x6000>;
+			interrupts = <2 1>;
+		};
+
+		hdmi: brcm,vc4-hdmi at 7e902000 {
+			compatible = "brcm,vc4-hdmi";
+			reg = <0x7e902000 0x600>,
+			      <0x7e808000 0x100>;
+			interrupts = <2 8>, <2 9>;
+			ddc = <&i2c2>;
+			hpd-gpio = <&gpio 46 GPIO_ACTIVE_HIGH>;
+			crtc = <&pv2>;
+		};
+
+		vc4: vc4 at 0x7e4c0000 {
+			compatible = "brcm,vc4";
+
+			crtcs = <&pv0>, <&pv1>, <&pv2>;
+			encoders = <&hdmi>;
+			hvss = <&hvs>;
+		};
+	};
+};
-- 
2.1.4

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Stephen Warren]

On 08/12/2015 06:56 PM, Eric Anholt wrote:
> Signed-off-by: Eric Anholt <eric@anholt.net>

This one definitely needs a patch description, since someone might not
know what a VC4 is, and "git log" won't show the text from the binding
doc itself. I'd suggest adding the initial paragraph of the binding doc
as the patch description, or more.

> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt

> +Required properties for VC4:
> +- compatible:	Should be "brcm,vc4"
> +- crtcs:	List of references to pixelvalve scanout engines

s/references to/phandles of/ would be more typical DT language.

> +- hvss:		List of references to HVS video scalers
> +- encoders:	List of references to output encoders (HDMI, SDTV)

Would it make sense to make all those nodes child node of the vc4
object. That way, there's no need to have these lists of objects; they
can be automatically built up as the DT is enumerated. I know that e.g.
the NVIDIA Tegra host1x binding works this way, and I think it may have
been inspired by other similar cases.

Of course, this is only appropriate if the HW modules really are
logically children of the VC4 HW module. Perhaps they aren't. If they
aren't though, I wonder what this "vc4" module actually represents in HW?

> +Required properties for HDMI
> +- compatible:	Should be "brcm,vc4-hdmi"
> +- reg:		Physical base address and length of the two register ranges
> +		  ("HDMI" and "HD")

I'd add "in that order" right before ")".

> +Example:
> +/ {
> +	soc {

Minor nit: Examples often don't include any nodes "above" the nodes
whose bindings are being documented.

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Eric Anholt]

Stephen Warren <swarren@wwwdotorg.org> writes:

> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>> Signed-off-by: Eric Anholt <eric@anholt.net>
>
> This one definitely needs a patch description, since someone might not
> know what a VC4 is, and "git log" won't show the text from the binding
> doc itself. I'd suggest adding the initial paragraph of the binding doc
> as the patch description, or more.
>
>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt

>> +- hvss:		List of references to HVS video scalers
>> +- encoders:	List of references to output encoders (HDMI, SDTV)
>
> Would it make sense to make all those nodes child node of the vc4
> object. That way, there's no need to have these lists of objects; they
> can be automatically built up as the DT is enumerated. I know that e.g.
> the NVIDIA Tegra host1x binding works this way, and I think it may have
> been inspired by other similar cases.

I've looked at tegra, and the component system used by msm appears to be
nicer than it.  To follow tegra's model, it looks like I need to build
this extra bus thing corresponding to host1x that is effectively the
drivers/base/component.c code, so that I can get at vc4's structure from
the component drivers.

> Of course, this is only appropriate if the HW modules really are
> logically children of the VC4 HW module. Perhaps they aren't. If they
> aren't though, I wonder what this "vc4" module actually represents in HW?

It's the subsystem, same as we use a subsystem node for msm, sti,
rockchip, imx, and exynos.  This appears to be the common model of how
the collection of graphics-related components is represented in the DT.
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[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Rob Herring]

On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
> Stephen Warren <swarren@wwwdotorg.org> writes:
>
>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>>> Signed-off-by: Eric Anholt <eric@anholt.net>
>>
>> This one definitely needs a patch description, since someone might not
>> know what a VC4 is, and "git log" won't show the text from the binding
>> doc itself. I'd suggest adding the initial paragraph of the binding doc
>> as the patch description, or more.
>>
>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>
>>> +- hvss:             List of references to HVS video scalers
>>> +- encoders: List of references to output encoders (HDMI, SDTV)
>>
>> Would it make sense to make all those nodes child node of the vc4
>> object. That way, there's no need to have these lists of objects; they
>> can be automatically built up as the DT is enumerated. I know that e.g.
>> the NVIDIA Tegra host1x binding works this way, and I think it may have
>> been inspired by other similar cases.
>
> I've looked at tegra, and the component system used by msm appears to be
> nicer than it.  To follow tegra's model, it looks like I need to build
> this extra bus thing corresponding to host1x that is effectively the
> drivers/base/component.c code, so that I can get at vc4's structure from
> the component drivers.
>
>> Of course, this is only appropriate if the HW modules really are
>> logically children of the VC4 HW module. Perhaps they aren't. If they
>> aren't though, I wonder what this "vc4" module actually represents in HW?
>
> It's the subsystem, same as we use a subsystem node for msm, sti,
> rockchip, imx, and exynos.  This appears to be the common model of how
> the collection of graphics-related components is represented in the DT.

I think most of these bindings are wrong. They are grouped together
because that is what DRM wants not because that reflects the h/w. So
convince me this is one block, not that it is what other people do.

Rob

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Rob Clark]

On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
> On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
>> Stephen Warren <swarren@wwwdotorg.org> writes:
>>
>>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>>>> Signed-off-by: Eric Anholt <eric@anholt.net>
>>>
>>> This one definitely needs a patch description, since someone might not
>>> know what a VC4 is, and "git log" won't show the text from the binding
>>> doc itself. I'd suggest adding the initial paragraph of the binding doc
>>> as the patch description, or more.
>>>
>>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>>
>>>> +- hvss:             List of references to HVS video scalers
>>>> +- encoders: List of references to output encoders (HDMI, SDTV)
>>>
>>> Would it make sense to make all those nodes child node of the vc4
>>> object. That way, there's no need to have these lists of objects; they
>>> can be automatically built up as the DT is enumerated. I know that e.g.
>>> the NVIDIA Tegra host1x binding works this way, and I think it may have
>>> been inspired by other similar cases.
>>
>> I've looked at tegra, and the component system used by msm appears to be
>> nicer than it.  To follow tegra's model, it looks like I need to build
>> this extra bus thing corresponding to host1x that is effectively the
>> drivers/base/component.c code, so that I can get at vc4's structure from
>> the component drivers.
>>
>>> Of course, this is only appropriate if the HW modules really are
>>> logically children of the VC4 HW module. Perhaps they aren't. If they
>>> aren't though, I wonder what this "vc4" module actually represents in HW?
>>
>> It's the subsystem, same as we use a subsystem node for msm, sti,
>> rockchip, imx, and exynos.  This appears to be the common model of how
>> the collection of graphics-related components is represented in the DT.
>
> I think most of these bindings are wrong. They are grouped together
> because that is what DRM wants not because that reflects the h/w. So
> convince me this is one block, not that it is what other people do.

I think, when it comes to more complex driver subsystems (like drm in
particular) we have a bit of mismatch between how things look from the
"pure hw ignoring sw" perspective, and the "how sw and in particular
userspace expects things" perspective.  Maybe it is less a problem in
other subsystems, where bindings map to things that are only visible
in the kernel, or well defined devices like uart or sata controller.
But when given the choice, I'm going to err on the side of not
confusing userspace and the large software stack that sits above
drm/kms, over dt purity.

Maybe it would be nice to have a sort of dt overlay that adds the bits
needed to tie together hw blocks that should be assembled into a
single logical device for linux and userspace (but maybe not some
other hypothetical operating system).  But so far that doesn't exist.
All we have is a hammer (devicetree), everything looks like a nail.
End result is we end up adding some things in the bindings which
aren't purely about the hw.  Until someone invents a screwdriver, I'm
not sure what else to do.  In the end, other hypothetical OS is free
to ignore those extra fields in the bindings if it doesn't need them.
So meh?

BR,
-R


> Rob
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Rob Herring]

On Tue, Aug 25, 2015 at 3:42 PM, Rob Clark <robdclark@gmail.com> wrote:
> On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
>> On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
>>> Stephen Warren <swarren@wwwdotorg.org> writes:
>>>
>>>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>>>>> Signed-off-by: Eric Anholt <eric@anholt.net>
>>>>
>>>> This one definitely needs a patch description, since someone might not
>>>> know what a VC4 is, and "git log" won't show the text from the binding
>>>> doc itself. I'd suggest adding the initial paragraph of the binding doc
>>>> as the patch description, or more.
>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>>>
>>>>> +- hvss:             List of references to HVS video scalers
>>>>> +- encoders: List of references to output encoders (HDMI, SDTV)
>>>>
>>>> Would it make sense to make all those nodes child node of the vc4
>>>> object. That way, there's no need to have these lists of objects; they
>>>> can be automatically built up as the DT is enumerated. I know that e.g.
>>>> the NVIDIA Tegra host1x binding works this way, and I think it may have
>>>> been inspired by other similar cases.
>>>
>>> I've looked at tegra, and the component system used by msm appears to be
>>> nicer than it.  To follow tegra's model, it looks like I need to build
>>> this extra bus thing corresponding to host1x that is effectively the
>>> drivers/base/component.c code, so that I can get at vc4's structure from
>>> the component drivers.
>>>
>>>> Of course, this is only appropriate if the HW modules really are
>>>> logically children of the VC4 HW module. Perhaps they aren't. If they
>>>> aren't though, I wonder what this "vc4" module actually represents in HW?
>>>
>>> It's the subsystem, same as we use a subsystem node for msm, sti,
>>> rockchip, imx, and exynos.  This appears to be the common model of how
>>> the collection of graphics-related components is represented in the DT.
>>
>> I think most of these bindings are wrong. They are grouped together
>> because that is what DRM wants not because that reflects the h/w. So
>> convince me this is one block, not that it is what other people do.
>
> I think, when it comes to more complex driver subsystems (like drm in
> particular) we have a bit of mismatch between how things look from the
> "pure hw ignoring sw" perspective, and the "how sw and in particular
> userspace expects things" perspective.  Maybe it is less a problem in
> other subsystems, where bindings map to things that are only visible
> in the kernel, or well defined devices like uart or sata controller.
> But when given the choice, I'm going to err on the side of not
> confusing userspace and the large software stack that sits above
> drm/kms, over dt purity.

I wasn't implying that this should get exposed to userspace as
components. V4L2 has gone that route with media controller and
sub-devs. Perhaps that is needed for DRM, perhaps not. For the moment,
I definitely agree the kernel should hide most/all of those details,
but I don't think that means DT has to hide the details or know what
components are handled by a single driver. My point was that on the DT
side we have a mixture of OF graph usage, parent-child nodes or custom
phandles (this case) to describe the relationships between h/w
components. That's not necessarily wrong, but we should have some
rules around how certain relationships are described. Then in the
drivers we have a mixture of deferred probe, component API, and custom
inter-module APIs to control init order. We then have a mixture of all
those which leads to very few if any drivers having the same overall
structure that could be shared. Should we mandate using the component
API for h/w that is discrete blocks? Should we throw out the component
API for something else? Can we tie the graph parsing and component API
together with common code?


> Maybe it would be nice to have a sort of dt overlay that adds the bits
> needed to tie together hw blocks that should be assembled into a
> single logical device for linux and userspace (but maybe not some
> other hypothetical operating system).  But so far that doesn't exist.

OF graph is supposed to do this. OF graph is a double edged sword. It
is very flexible, but then each platform can do something different.
We need to have some level of requirements around how the OF graph is
used. As an example, any system with an HDMI connector should have an
"hdmi-connector" compatible node or encoder/bridge chips/blocks must
have certain ports defined.


> All we have is a hammer (devicetree), everything looks like a nail.
> End result is we end up adding some things in the bindings which
> aren't purely about the hw.  Until someone invents a screwdriver, I'm
> not sure what else to do.  In the end, other hypothetical OS is free
> to ignore those extra fields in the bindings if it doesn't need them.
> So meh?

We really want to err on the side of fewer bindings, not more as once
used they are an ABI.

Rob

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Daniel Vetter]

On Tue, Aug 25, 2015 at 04:42:18PM -0400, Rob Clark wrote:
> On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
> > On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
> >> Stephen Warren <swarren@wwwdotorg.org> writes:
> >>
> >>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
> >>>> Signed-off-by: Eric Anholt <eric@anholt.net>
> >>>
> >>> This one definitely needs a patch description, since someone might not
> >>> know what a VC4 is, and "git log" won't show the text from the binding
> >>> doc itself. I'd suggest adding the initial paragraph of the binding doc
> >>> as the patch description, or more.
> >>>
> >>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> >>
> >>>> +- hvss:             List of references to HVS video scalers
> >>>> +- encoders: List of references to output encoders (HDMI, SDTV)
> >>>
> >>> Would it make sense to make all those nodes child node of the vc4
> >>> object. That way, there's no need to have these lists of objects; they
> >>> can be automatically built up as the DT is enumerated. I know that e.g.
> >>> the NVIDIA Tegra host1x binding works this way, and I think it may have
> >>> been inspired by other similar cases.
> >>
> >> I've looked at tegra, and the component system used by msm appears to be
> >> nicer than it.  To follow tegra's model, it looks like I need to build
> >> this extra bus thing corresponding to host1x that is effectively the
> >> drivers/base/component.c code, so that I can get at vc4's structure from
> >> the component drivers.
> >>
> >>> Of course, this is only appropriate if the HW modules really are
> >>> logically children of the VC4 HW module. Perhaps they aren't. If they
> >>> aren't though, I wonder what this "vc4" module actually represents in HW?
> >>
> >> It's the subsystem, same as we use a subsystem node for msm, sti,
> >> rockchip, imx, and exynos.  This appears to be the common model of how
> >> the collection of graphics-related components is represented in the DT.
> >
> > I think most of these bindings are wrong. They are grouped together
> > because that is what DRM wants not because that reflects the h/w. So
> > convince me this is one block, not that it is what other people do.
> 
> I think, when it comes to more complex driver subsystems (like drm in
> particular) we have a bit of mismatch between how things look from the
> "pure hw ignoring sw" perspective, and the "how sw and in particular
> userspace expects things" perspective.  Maybe it is less a problem in
> other subsystems, where bindings map to things that are only visible
> in the kernel, or well defined devices like uart or sata controller.
> But when given the choice, I'm going to err on the side of not
> confusing userspace and the large software stack that sits above
> drm/kms, over dt purity.
> 
> Maybe it would be nice to have a sort of dt overlay that adds the bits
> needed to tie together hw blocks that should be assembled into a
> single logical device for linux and userspace (but maybe not some
> other hypothetical operating system).  But so far that doesn't exist.
> All we have is a hammer (devicetree), everything looks like a nail.
> End result is we end up adding some things in the bindings which
> aren't purely about the hw.  Until someone invents a screwdriver, I'm
> not sure what else to do.  In the end, other hypothetical OS is free
> to ignore those extra fields in the bindings if it doesn't need them.
> So meh?

I thought we agreed a while back that these kind of "pull everything for
the logical device together" dt nodes which just have piles of phandles
are totally accepted? At least that's the point behind the component
helpers, and Eric even suggested to create dt-specific component helpers
to cut down a bit on the usual boilerplate. dt maintainers are also fine
with this approach afaik. From my understanding tegra with the host1x bus
really is the odd one out and not the norm.

Given that and with the hope that we'll eventually see a dt-enabled
component functions to standardize this even more the overall concept is

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Cheers, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Thierry Reding]

On Wed, Aug 26, 2015 at 01:52:29PM +0200, Daniel Vetter wrote:
> On Tue, Aug 25, 2015 at 04:42:18PM -0400, Rob Clark wrote:
> > On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
> > > On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
> > >> Stephen Warren <swarren@wwwdotorg.org> writes:
> > >>
> > >>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
> > >>>> Signed-off-by: Eric Anholt <eric@anholt.net>
> > >>>
> > >>> This one definitely needs a patch description, since someone might not
> > >>> know what a VC4 is, and "git log" won't show the text from the binding
> > >>> doc itself. I'd suggest adding the initial paragraph of the binding doc
> > >>> as the patch description, or more.
> > >>>
> > >>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> > >>
> > >>>> +- hvss:             List of references to HVS video scalers
> > >>>> +- encoders: List of references to output encoders (HDMI, SDTV)
> > >>>
> > >>> Would it make sense to make all those nodes child node of the vc4
> > >>> object. That way, there's no need to have these lists of objects; they
> > >>> can be automatically built up as the DT is enumerated. I know that e.g.
> > >>> the NVIDIA Tegra host1x binding works this way, and I think it may have
> > >>> been inspired by other similar cases.
> > >>
> > >> I've looked at tegra, and the component system used by msm appears to be
> > >> nicer than it.  To follow tegra's model, it looks like I need to build
> > >> this extra bus thing corresponding to host1x that is effectively the
> > >> drivers/base/component.c code, so that I can get at vc4's structure from
> > >> the component drivers.
> > >>
> > >>> Of course, this is only appropriate if the HW modules really are
> > >>> logically children of the VC4 HW module. Perhaps they aren't. If they
> > >>> aren't though, I wonder what this "vc4" module actually represents in HW?
> > >>
> > >> It's the subsystem, same as we use a subsystem node for msm, sti,
> > >> rockchip, imx, and exynos.  This appears to be the common model of how
> > >> the collection of graphics-related components is represented in the DT.
> > >
> > > I think most of these bindings are wrong. They are grouped together
> > > because that is what DRM wants not because that reflects the h/w. So
> > > convince me this is one block, not that it is what other people do.
> > 
> > I think, when it comes to more complex driver subsystems (like drm in
> > particular) we have a bit of mismatch between how things look from the
> > "pure hw ignoring sw" perspective, and the "how sw and in particular
> > userspace expects things" perspective.  Maybe it is less a problem in
> > other subsystems, where bindings map to things that are only visible
> > in the kernel, or well defined devices like uart or sata controller.
> > But when given the choice, I'm going to err on the side of not
> > confusing userspace and the large software stack that sits above
> > drm/kms, over dt purity.
> > 
> > Maybe it would be nice to have a sort of dt overlay that adds the bits
> > needed to tie together hw blocks that should be assembled into a
> > single logical device for linux and userspace (but maybe not some
> > other hypothetical operating system).  But so far that doesn't exist.
> > All we have is a hammer (devicetree), everything looks like a nail.
> > End result is we end up adding some things in the bindings which
> > aren't purely about the hw.  Until someone invents a screwdriver, I'm
> > not sure what else to do.  In the end, other hypothetical OS is free
> > to ignore those extra fields in the bindings if it doesn't need them.
> > So meh?
> 
> I thought we agreed a while back that these kind of "pull everything for
> the logical device together" dt nodes which just have piles of phandles
> are totally accepted? At least that's the point behind the component
> helpers, and Eric even suggested to create dt-specific component helpers
> to cut down a bit on the usual boilerplate. dt maintainers are also fine
> with this approach afaik. From my understanding tegra with the host1x bus
> really is the odd one out and not the norm.

I agree that in many aspects Tegra is somewhat special. But the same
principles that the host1x infrastructure uses could be implemented in a
similar way for other DRM drivers. You can easily collect information
about subdevices by walking the device tree and matching on known
compatible strings. And you can also instantiate the top-level device
from driver code rather than have it in DT. It should still be possible
to make this work without an artificial device node in DT. The component
and master infrastructure is largely orthogonal to that, and as far as I
remember the only blocker is the need for a top-level device. I wonder
if perhaps this could be made to work by binding the master to the top-
level SoC device.

Obviously adding the node in DT is easier, but to my knowledge easy has
never been a good excuse for mangling DT. Perhaps that's different these
days...

Thierry
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[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Rob Herring]

On Wed, Aug 26, 2015 at 7:09 AM, Thierry Reding
<thierry.reding@gmail.com> wrote:
> On Wed, Aug 26, 2015 at 01:52:29PM +0200, Daniel Vetter wrote:
>> On Tue, Aug 25, 2015 at 04:42:18PM -0400, Rob Clark wrote:
>> > On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
>> > > On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
>> > >> Stephen Warren <swarren@wwwdotorg.org> writes:
>> > >>
>> > >>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>> > >>>> Signed-off-by: Eric Anholt <eric@anholt.net>
>> > >>>
>> > >>> This one definitely needs a patch description, since someone might not
>> > >>> know what a VC4 is, and "git log" won't show the text from the binding
>> > >>> doc itself. I'd suggest adding the initial paragraph of the binding doc
>> > >>> as the patch description, or more.
>> > >>>
>> > >>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>> > >>
>> > >>>> +- hvss:             List of references to HVS video scalers
>> > >>>> +- encoders: List of references to output encoders (HDMI, SDTV)
>> > >>>
>> > >>> Would it make sense to make all those nodes child node of the vc4
>> > >>> object. That way, there's no need to have these lists of objects; they
>> > >>> can be automatically built up as the DT is enumerated. I know that e.g.
>> > >>> the NVIDIA Tegra host1x binding works this way, and I think it may have
>> > >>> been inspired by other similar cases.
>> > >>
>> > >> I've looked at tegra, and the component system used by msm appears to be
>> > >> nicer than it.  To follow tegra's model, it looks like I need to build
>> > >> this extra bus thing corresponding to host1x that is effectively the
>> > >> drivers/base/component.c code, so that I can get at vc4's structure from
>> > >> the component drivers.
>> > >>
>> > >>> Of course, this is only appropriate if the HW modules really are
>> > >>> logically children of the VC4 HW module. Perhaps they aren't. If they
>> > >>> aren't though, I wonder what this "vc4" module actually represents in HW?
>> > >>
>> > >> It's the subsystem, same as we use a subsystem node for msm, sti,
>> > >> rockchip, imx, and exynos.  This appears to be the common model of how
>> > >> the collection of graphics-related components is represented in the DT.
>> > >
>> > > I think most of these bindings are wrong. They are grouped together
>> > > because that is what DRM wants not because that reflects the h/w. So
>> > > convince me this is one block, not that it is what other people do.
>> >
>> > I think, when it comes to more complex driver subsystems (like drm in
>> > particular) we have a bit of mismatch between how things look from the
>> > "pure hw ignoring sw" perspective, and the "how sw and in particular
>> > userspace expects things" perspective.  Maybe it is less a problem in
>> > other subsystems, where bindings map to things that are only visible
>> > in the kernel, or well defined devices like uart or sata controller.
>> > But when given the choice, I'm going to err on the side of not
>> > confusing userspace and the large software stack that sits above
>> > drm/kms, over dt purity.
>> >
>> > Maybe it would be nice to have a sort of dt overlay that adds the bits
>> > needed to tie together hw blocks that should be assembled into a
>> > single logical device for linux and userspace (but maybe not some
>> > other hypothetical operating system).  But so far that doesn't exist.
>> > All we have is a hammer (devicetree), everything looks like a nail.
>> > End result is we end up adding some things in the bindings which
>> > aren't purely about the hw.  Until someone invents a screwdriver, I'm
>> > not sure what else to do.  In the end, other hypothetical OS is free
>> > to ignore those extra fields in the bindings if it doesn't need them.
>> > So meh?
>>
>> I thought we agreed a while back that these kind of "pull everything for
>> the logical device together" dt nodes which just have piles of phandles
>> are totally accepted? At least that's the point behind the component
>> helpers, and Eric even suggested to create dt-specific component helpers
>> to cut down a bit on the usual boilerplate. dt maintainers are also fine
>> with this approach afaik. From my understanding tegra with the host1x bus
>> really is the odd one out and not the norm.
>
> I agree that in many aspects Tegra is somewhat special. But the same
> principles that the host1x infrastructure uses could be implemented in a
> similar way for other DRM drivers. You can easily collect information
> about subdevices by walking the device tree and matching on known
> compatible strings. And you can also instantiate the top-level device
> from driver code rather than have it in DT. It should still be possible
> to make this work without an artificial device node in DT. The component
> and master infrastructure is largely orthogonal to that, and as far as I
> remember the only blocker is the need for a top-level device. I wonder
> if perhaps this could be made to work by binding the master to the top-
> level SoC device.
>
> Obviously adding the node in DT is easier, but to my knowledge easy has
> never been a good excuse for mangling DT. Perhaps that's different these
> days...

I agree we should avoid the virtual node if possible. It is certainly
possible as I started out with one and removed it. At least in my
case, it essentially required the drm_device and crtc to be a single
driver rather than 2 components. However, I'm more concerned that we
are consistent from platform to platform where it makes sense than
whether we have a somewhat questionable node or not.

Rob

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Dave Airlie]

On 27 August 2015 at 00:30, Rob Herring <robherring2@gmail.com> wrote:
> On Wed, Aug 26, 2015 at 7:09 AM, Thierry Reding
> <thierry.reding@gmail.com> wrote:
>> On Wed, Aug 26, 2015 at 01:52:29PM +0200, Daniel Vetter wrote:
>>> On Tue, Aug 25, 2015 at 04:42:18PM -0400, Rob Clark wrote:
>>> > On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
>>> > > On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
>>> > >> Stephen Warren <swarren@wwwdotorg.org> writes:
>>> > >>
>>> > >>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>>> > >>>> Signed-off-by: Eric Anholt <eric@anholt.net>
>>> > >>>
>>> > >>> This one definitely needs a patch description, since someone might not
>>> > >>> know what a VC4 is, and "git log" won't show the text from the binding
>>> > >>> doc itself. I'd suggest adding the initial paragraph of the binding doc
>>> > >>> as the patch description, or more.
>>> > >>>
>>> > >>>> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>>> > >>
>>> > >>>> +- hvss:             List of references to HVS video scalers
>>> > >>>> +- encoders: List of references to output encoders (HDMI, SDTV)
>>> > >>>
>>> > >>> Would it make sense to make all those nodes child node of the vc4
>>> > >>> object. That way, there's no need to have these lists of objects; they
>>> > >>> can be automatically built up as the DT is enumerated. I know that e.g.
>>> > >>> the NVIDIA Tegra host1x binding works this way, and I think it may have
>>> > >>> been inspired by other similar cases.
>>> > >>
>>> > >> I've looked at tegra, and the component system used by msm appears to be
>>> > >> nicer than it.  To follow tegra's model, it looks like I need to build
>>> > >> this extra bus thing corresponding to host1x that is effectively the
>>> > >> drivers/base/component.c code, so that I can get at vc4's structure from
>>> > >> the component drivers.
>>> > >>
>>> > >>> Of course, this is only appropriate if the HW modules really are
>>> > >>> logically children of the VC4 HW module. Perhaps they aren't. If they
>>> > >>> aren't though, I wonder what this "vc4" module actually represents in HW?
>>> > >>
>>> > >> It's the subsystem, same as we use a subsystem node for msm, sti,
>>> > >> rockchip, imx, and exynos.  This appears to be the common model of how
>>> > >> the collection of graphics-related components is represented in the DT.
>>> > >
>>> > > I think most of these bindings are wrong. They are grouped together
>>> > > because that is what DRM wants not because that reflects the h/w. So
>>> > > convince me this is one block, not that it is what other people do.
>>> >
>>> > I think, when it comes to more complex driver subsystems (like drm in
>>> > particular) we have a bit of mismatch between how things look from the
>>> > "pure hw ignoring sw" perspective, and the "how sw and in particular
>>> > userspace expects things" perspective.  Maybe it is less a problem in
>>> > other subsystems, where bindings map to things that are only visible
>>> > in the kernel, or well defined devices like uart or sata controller.
>>> > But when given the choice, I'm going to err on the side of not
>>> > confusing userspace and the large software stack that sits above
>>> > drm/kms, over dt purity.
>>> >
>>> > Maybe it would be nice to have a sort of dt overlay that adds the bits
>>> > needed to tie together hw blocks that should be assembled into a
>>> > single logical device for linux and userspace (but maybe not some
>>> > other hypothetical operating system).  But so far that doesn't exist.
>>> > All we have is a hammer (devicetree), everything looks like a nail.
>>> > End result is we end up adding some things in the bindings which
>>> > aren't purely about the hw.  Until someone invents a screwdriver, I'm
>>> > not sure what else to do.  In the end, other hypothetical OS is free
>>> > to ignore those extra fields in the bindings if it doesn't need them.
>>> > So meh?
>>>
>>> I thought we agreed a while back that these kind of "pull everything for
>>> the logical device together" dt nodes which just have piles of phandles
>>> are totally accepted? At least that's the point behind the component
>>> helpers, and Eric even suggested to create dt-specific component helpers
>>> to cut down a bit on the usual boilerplate. dt maintainers are also fine
>>> with this approach afaik. From my understanding tegra with the host1x bus
>>> really is the odd one out and not the norm.
>>
>> I agree that in many aspects Tegra is somewhat special. But the same
>> principles that the host1x infrastructure uses could be implemented in a
>> similar way for other DRM drivers. You can easily collect information
>> about subdevices by walking the device tree and matching on known
>> compatible strings. And you can also instantiate the top-level device
>> from driver code rather than have it in DT. It should still be possible
>> to make this work without an artificial device node in DT. The component
>> and master infrastructure is largely orthogonal to that, and as far as I
>> remember the only blocker is the need for a top-level device. I wonder
>> if perhaps this could be made to work by binding the master to the top-
>> level SoC device.
>>
>> Obviously adding the node in DT is easier, but to my knowledge easy has
>> never been a good excuse for mangling DT. Perhaps that's different these
>> days...
>
> I agree we should avoid the virtual node if possible. It is certainly
> possible as I started out with one and removed it. At least in my
> case, it essentially required the drm_device and crtc to be a single
> driver rather than 2 components. However, I'm more concerned that we
> are consistent from platform to platform where it makes sense than
> whether we have a somewhat questionable node or not.
>
http://lists.freedesktop.org/archives/dri-devel/2013-July/041159.html

So can we at least have some continuity of decision making,
bikeshedding this every time we submit a driver isn't giving me any
hope going forward.

Dave.

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Rob Herring]

On Wed, Aug 26, 2015 at 3:59 PM, Dave Airlie <airlied@gmail.com> wrote:
> On 27 August 2015 at 00:30, Rob Herring <robherring2@gmail.com> wrote:
>> On Wed, Aug 26, 2015 at 7:09 AM, Thierry Reding
>> <thierry.reding@gmail.com> wrote:
>>> On Wed, Aug 26, 2015 at 01:52:29PM +0200, Daniel Vetter wrote:
>>>> On Tue, Aug 25, 2015 at 04:42:18PM -0400, Rob Clark wrote:
>>>> > On Mon, Aug 24, 2015 at 9:47 AM, Rob Herring <robherring2@gmail.com> wrote:
>>>> > > On Mon, Aug 17, 2015 at 1:30 PM, Eric Anholt <eric@anholt.net> wrote:
>>>> > >> Stephen Warren <swarren@wwwdotorg.org> writes:
>>>> > >>
>>>> > >>> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>>>> > >>>> Signed-off-by: Eric Anholt <eric@anholt.net>
[...]
>>>> > >>>> +- hvss:             List of references to HVS video scalers
>>>> > >>>> +- encoders: List of references to output encoders (HDMI, SDTV)
[...]
>>>> > >>> Of course, this is only appropriate if the HW modules really are
>>>> > >>> logically children of the VC4 HW module. Perhaps they aren't. If they
>>>> > >>> aren't though, I wonder what this "vc4" module actually represents in HW?
>>>> > >>
>>>> > >> It's the subsystem, same as we use a subsystem node for msm, sti,
>>>> > >> rockchip, imx, and exynos.  This appears to be the common model of how
>>>> > >> the collection of graphics-related components is represented in the DT.
>>>> > >
>>>> > > I think most of these bindings are wrong. They are grouped together
>>>> > > because that is what DRM wants not because that reflects the h/w. So
>>>> > > convince me this is one block, not that it is what other people do.
>>>> >
>>>> > I think, when it comes to more complex driver subsystems (like drm in
>>>> > particular) we have a bit of mismatch between how things look from the
>>>> > "pure hw ignoring sw" perspective, and the "how sw and in particular
>>>> > userspace expects things" perspective.  Maybe it is less a problem in
>>>> > other subsystems, where bindings map to things that are only visible
>>>> > in the kernel, or well defined devices like uart or sata controller.
>>>> > But when given the choice, I'm going to err on the side of not
>>>> > confusing userspace and the large software stack that sits above
>>>> > drm/kms, over dt purity.
>>>> >
>>>> > Maybe it would be nice to have a sort of dt overlay that adds the bits
>>>> > needed to tie together hw blocks that should be assembled into a
>>>> > single logical device for linux and userspace (but maybe not some
>>>> > other hypothetical operating system).  But so far that doesn't exist.
>>>> > All we have is a hammer (devicetree), everything looks like a nail.
>>>> > End result is we end up adding some things in the bindings which
>>>> > aren't purely about the hw.  Until someone invents a screwdriver, I'm
>>>> > not sure what else to do.  In the end, other hypothetical OS is free
>>>> > to ignore those extra fields in the bindings if it doesn't need them.
>>>> > So meh?
>>>>
>>>> I thought we agreed a while back that these kind of "pull everything for
>>>> the logical device together" dt nodes which just have piles of phandles
>>>> are totally accepted? At least that's the point behind the component
>>>> helpers, and Eric even suggested to create dt-specific component helpers
>>>> to cut down a bit on the usual boilerplate. dt maintainers are also fine
>>>> with this approach afaik. From my understanding tegra with the host1x bus
>>>> really is the odd one out and not the norm.
>>>
>>> I agree that in many aspects Tegra is somewhat special. But the same
>>> principles that the host1x infrastructure uses could be implemented in a
>>> similar way for other DRM drivers. You can easily collect information
>>> about subdevices by walking the device tree and matching on known
>>> compatible strings. And you can also instantiate the top-level device
>>> from driver code rather than have it in DT. It should still be possible
>>> to make this work without an artificial device node in DT. The component
>>> and master infrastructure is largely orthogonal to that, and as far as I
>>> remember the only blocker is the need for a top-level device. I wonder
>>> if perhaps this could be made to work by binding the master to the top-
>>> level SoC device.
>>>
>>> Obviously adding the node in DT is easier, but to my knowledge easy has
>>> never been a good excuse for mangling DT. Perhaps that's different these
>>> days...
>>
>> I agree we should avoid the virtual node if possible. It is certainly
>> possible as I started out with one and removed it. At least in my
>> case, it essentially required the drm_device and crtc to be a single
>> driver rather than 2 components. However, I'm more concerned that we
>> are consistent from platform to platform where it makes sense than
>> whether we have a somewhat questionable node or not.
>>
> http://lists.freedesktop.org/archives/dri-devel/2013-July/041159.html
>
> So can we at least have some continuity of decision making,
> bikeshedding this every time we submit a driver isn't giving me any
> hope going forward.

As I said, whether we have a virtual node or not is a minor part of
having some consistency in bindings and was the only part Grant
discussed. We have though diverged from the specific problems with
this binding which is that it invents yet another way to describe the
relationship between components. The use of DRM component names in the
binding properties is the first clue. As to what is the "right" way,
well if that is known or documented I've seen no evidence. Defining
what that is and having the infrastructure in place to support it is
what I'm interested in.

Rob

[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Thierry Reding]

On Fri, Aug 14, 2015 at 10:38:54PM -0600, Stephen Warren wrote:
> On 08/12/2015 06:56 PM, Eric Anholt wrote:
> > Signed-off-by: Eric Anholt <eric@anholt.net>
> 
> This one definitely needs a patch description, since someone might not
> know what a VC4 is, and "git log" won't show the text from the binding
> doc itself. I'd suggest adding the initial paragraph of the binding doc
> as the patch description, or more.
> 
> > diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> 
> > +Required properties for VC4:
> > +- compatible:	Should be "brcm,vc4"
> > +- crtcs:	List of references to pixelvalve scanout engines
> 
> s/references to/phandles of/ would be more typical DT language.
> 
> > +- hvss:		List of references to HVS video scalers
> > +- encoders:	List of references to output encoders (HDMI, SDTV)
> 
> Would it make sense to make all those nodes child node of the vc4
> object. That way, there's no need to have these lists of objects; they
> can be automatically built up as the DT is enumerated. I know that e.g.
> the NVIDIA Tegra host1x binding works this way, and I think it may have
> been inspired by other similar cases.

Actually the host1x binding was the first of its kind. Unfortunately for
the purposes of this discussion (but fortunately otherwise) Tegra is the
odd-ball it seems. host1x is indeed a physical parent of all the devices
pertaining to the DRM driver, so the DT description is accurate from a
hardware point of view while at the same time giving us a top-level
device that we can bind against.

Now for most other cases it seems like the central piece that they are
missing is this top-level device, hence why the "virtual DRM subsystem
device" is instantiated. I tried to argue in the past that it wasn't a
proper description and proposed alternatives, but I was always pretty
much the only one with this viewpoint, so my comments ended up being
ignored.

Technically there is nothing that would prevent other drivers from doing
without the lists of phandles. On Tegra, again this might be special for
this particular hardware, we've never had a need to describe these kinds
of relationships. Each display controller can essentially drive each of
the outputs, which we deal with elegantly by setting the .possible_crtcs
mask of the encoders.

Also, to pull together all devices that are needed to make up the DRM
device, we use a list of compatible strings in the driver to find these
devices. Then as each of them registers with the host1x bus we wait for
the subdevice list to become empty and ->probe() the component host1x
device.

Note that while this predates component/master, this is all very similar
in principle (Russell and I did have some discussions about this back at
the time, but I'm not sure how much, if anything, he took as inspiration
from the host1x infrastructure). After component/master was merged I did
try to convert Tegra DRM to use it. Things looked pretty good, but ended
up not working because each componentized device must have a unique
master device. This poses a problem because on Tegra we needed the top-
level (i.e. master) device to be shared among multiple drivers.

I posted patches at some point to try and fix remedy the situation but
wasn't able to elicit any reactions, and since I had something that was
working did not pursue this any further.

Thierry
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[PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

[Rob Herring]

On Wed, Aug 12, 2015 at 7:56 PM, Eric Anholt <eric@anholt.net> wrote:
> Signed-off-by: Eric Anholt <eric@anholt.net>
> ---
>  .../devicetree/bindings/gpu/brcm,bcm-vc4.txt       | 83 ++++++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>
> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> new file mode 100644
> index 0000000..2b13e61
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> @@ -0,0 +1,83 @@
> +Broadcom VC4 GPU
> +
> +The VC4 device present on the Raspberry Pi includes a display system
> +with HDMI output and the HVS scaler for compositing display planes.
> +
> +Required properties for VC4:
> +- compatible:  Should be "brcm,vc4"
> +- crtcs:       List of references to pixelvalve scanout engines
> +- hvss:                List of references to HVS video scalers
> +- encoders:    List of references to output encoders (HDMI, SDTV)

Creating these links is what the OF graph binding is for. Please use
it. Plus this is a DRMism in the binding.

> +
> +Required properties for Pixel Valve:
> +- compatible:  Should be "brcm,vc4-pixelvalve"

There's only one version of IP and all chips have the same bugs? You
should have chip names in the compatible strings.

> +- reg:         Physical base address and length of the PV's registers
> +- interrupts:  The interrupt number
> +                 See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
> +
> +Required properties for HVS:
> +- compatible:  Should be "brcm,vc4-hvs"
> +- reg:         Physical base address and length of the HVS's registers
> +- interrupts:  The interrupt number
> +                 See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
> +
> +Required properties for HDMI
> +- compatible:  Should be "brcm,vc4-hdmi"
> +- reg:         Physical base address and length of the two register ranges
> +                 ("HDMI" and "HD")
> +- interrupts:  The interrupt numbers
> +                 See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
> +- ddc:         phandle of the I2C controller used for DDC EDID probing
> +- crtc:                phandle to the pixelvalve CRTC the HDMI encoder is attached to

Same comment about OF graph.

> +
> +Optional properties for HDMI:
> +- hpd-gpio:    The GPIO pin for HDMI hotplug detect (if it doesn't appear
> +                 as an interrupt/status bit in the HDMI controller
> +                 itself).  See bindings/pinctrl/brcm,bcm2835-gpio.txt

Use the hdmi-connector binding. This doesn't belong here. The clue is
your comment in parenthesis.

Rob

[PATCH 2/7] MAINTAINERS: Add myself for the new VC4 (RPi GPU) graphics driver.

[Eric Anholt]

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 MAINTAINERS | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 8133cef..d0dc42c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3573,6 +3573,12 @@ S:	Maintained
 F:	drivers/gpu/drm/rockchip/
 F:	Documentation/devicetree/bindings/video/rockchip*
 
+DRM DRIVERS FOR VC4
+M:	Eric Anholt <eric@anholt.net>
+T:	git git://github.com/anholt/linux
+S:	Maintained
+F:	drivers/gpu/drm/vc4/*
+
 DSBR100 USB FM RADIO DRIVER
 M:	Alexey Klimov <klimov.linux@gmail.com>
 L:	linux-media at vger.kernel.org
-- 
2.1.4

[PATCH 2/7] MAINTAINERS: Add myself for the new VC4 (RPi GPU) graphics driver.

[Stephen Warren]

On 08/12/2015 06:56 PM, Eric Anholt wrote:

> diff --git a/MAINTAINERS b/MAINTAINERS

> +DRM DRIVERS FOR VC4
> +M:	Eric Anholt <eric@anholt.net>
> +T:	git git://github.com/anholt/linux
> +S:	Maintained
> +F:	drivers/gpu/drm/vc4/*

S: Supported

?

[PATCH 2/7] MAINTAINERS: Add myself for the new VC4 (RPi GPU) graphics driver.

[Eric Anholt]

Stephen Warren <swarren@wwwdotorg.org> writes:

> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>
>> +DRM DRIVERS FOR VC4
>> +M:	Eric Anholt <eric@anholt.net>
>> +T:	git git://github.com/anholt/linux
>> +S:	Maintained
>> +F:	drivers/gpu/drm/vc4/*
>
> S: Supported

Fixed.
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[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Eric Anholt]

This is the start of a full VC4 driver.  Right now this just supports
configuring the display using a pre-existing video mode (because
changing the pixel clock isn't available yet, and doesn't work when it
is).  However, this is enough for fbcon and bringing up X using
xf86-video-modesetting.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/gpu/drm/Kconfig           |   2 +
 drivers/gpu/drm/Makefile          |   1 +
 drivers/gpu/drm/vc4/Kconfig       |  14 +
 drivers/gpu/drm/vc4/Makefile      |  18 ++
 drivers/gpu/drm/vc4/vc4_bo.c      |  54 ++++
 drivers/gpu/drm/vc4/vc4_crtc.c    | 583 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/vc4/vc4_debugfs.c |  38 +++
 drivers/gpu/drm/vc4/vc4_drv.c     | 249 +++++++++++++++
 drivers/gpu/drm/vc4/vc4_drv.h     | 123 +++++++
 drivers/gpu/drm/vc4/vc4_hdmi.c    | 651 ++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/vc4/vc4_hvs.c     | 172 ++++++++++
 drivers/gpu/drm/vc4/vc4_kms.c     |  84 +++++
 drivers/gpu/drm/vc4/vc4_plane.c   | 320 +++++++++++++++++++
 drivers/gpu/drm/vc4/vc4_regs.h    | 562 ++++++++++++++++++++++++++++++++
 14 files changed, 2871 insertions(+)
 create mode 100644 drivers/gpu/drm/vc4/Kconfig
 create mode 100644 drivers/gpu/drm/vc4/Makefile
 create mode 100644 drivers/gpu/drm/vc4/vc4_bo.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_crtc.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_debugfs.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_drv.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_drv.h
 create mode 100644 drivers/gpu/drm/vc4/vc4_hdmi.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_hvs.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_kms.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_plane.c
 create mode 100644 drivers/gpu/drm/vc4/vc4_regs.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index c46ca31..1730a76 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -240,3 +240,5 @@ source "drivers/gpu/drm/sti/Kconfig"
 source "drivers/gpu/drm/amd/amdkfd/Kconfig"
 
 source "drivers/gpu/drm/imx/Kconfig"
+
+source "drivers/gpu/drm/vc4/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 5713d05..b991ac5 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_DRM_MGA)	+= mga/
 obj-$(CONFIG_DRM_I810)	+= i810/
 obj-$(CONFIG_DRM_I915)  += i915/
 obj-$(CONFIG_DRM_MGAG200) += mgag200/
+obj-$(CONFIG_DRM_VC4)  += vc4/
 obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus/
 obj-$(CONFIG_DRM_SIS)   += sis/
 obj-$(CONFIG_DRM_SAVAGE)+= savage/
diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
new file mode 100644
index 0000000..130cc94
--- /dev/null
+++ b/drivers/gpu/drm/vc4/Kconfig
@@ -0,0 +1,14 @@
+config DRM_VC4
+	tristate "Broadcom VC4 Graphics"
+	depends on ARCH_BCM2835
+	depends on DRM
+	select DRM_KMS_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_KMS_CMA_HELPER
+	help
+	  Choose this option if you have a system that has a Broadcom
+	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
+
+	  This driver requires that "avoid_warnings=2" be present in
+	  the config.txt for the firmware, to keep it from smashing
+	  our display setup.
diff --git a/drivers/gpu/drm/vc4/Makefile b/drivers/gpu/drm/vc4/Makefile
new file mode 100644
index 0000000..4aa07ca
--- /dev/null
+++ b/drivers/gpu/drm/vc4/Makefile
@@ -0,0 +1,18 @@
+ccflags-y := -Iinclude/drm
+
+# Please keep these build lists sorted!
+
+# core driver code
+vc4-y := \
+	vc4_bo.o \
+	vc4_crtc.o \
+	vc4_drv.o \
+	vc4_kms.o \
+	vc4_hdmi.o \
+	vc4_hvs.o \
+	vc4_plane.o \
+	$()
+
+vc4-$(CONFIG_DEBUG_FS) += vc4_debugfs.o
+
+obj-$(CONFIG_DRM_VC4)  += vc4.o
diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
new file mode 100644
index 0000000..fee8cac
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -0,0 +1,54 @@
+/*
+ *  Copyright ? 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* DOC: VC4 GEM BO management support.
+ *
+ * The VC4 GPU architecture (both scanout and rendering) has direct
+ * access to system memory with no MMU in between.  To support it, we
+ * use the GEM CMA helper functions to allocate contiguous ranges of
+ * physical memory for our BOs.
+ */
+
+#include "vc4_drv.h"
+
+struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
+{
+	struct drm_gem_cma_object *cma_obj;
+
+	cma_obj = drm_gem_cma_create(dev, size);
+	if (IS_ERR(cma_obj))
+		return NULL;
+	else
+		return to_vc4_bo(&cma_obj->base);
+}
+
+int vc4_dumb_create(struct drm_file *file_priv,
+		    struct drm_device *dev,
+		    struct drm_mode_create_dumb *args)
+{
+	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+	struct vc4_bo *bo = NULL;
+	int ret;
+
+	if (args->pitch < min_pitch)
+		args->pitch = min_pitch;
+
+	if (args->size < args->pitch * args->height)
+		args->size = args->pitch * args->height;
+
+	mutex_lock(&dev->struct_mutex);
+	bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
+	mutex_unlock(&dev->struct_mutex);
+	if (!bo)
+		return -ENOMEM;
+
+	ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
+	drm_gem_object_unreference_unlocked(&bo->base.base);
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
new file mode 100644
index 0000000..6f127f0
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -0,0 +1,583 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/**
+ * DOC: VC4 CRTC module
+ *
+ * In VC4, the Pixel Valve is what most closely corresponds to the
+ * DRM's concept of a CRTC.  The PV generates video timings from the
+ * pixel clock and its configuration.
+ *
+ * However, the DRM CRTC also collects the configuration of all the
+ * DRM planes attached to it.  As a result, this file also manages
+ * setup of the VC4 HVS's display elements on the CRTC.
+ */
+
+#include "drm_atomic_helper.h"
+#include "drm_crtc_helper.h"
+#include "linux/clk.h"
+#include "linux/component.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define CRTC_WRITE(offset, val) writel(val, vc4_crtc->regs + (offset))
+#define CRTC_READ(offset) readl(vc4_crtc->regs + (offset))
+
+#define CRTC_REG(reg) { reg, #reg }
+static const struct {
+	u32 reg;
+	const char *name;
+} crtc_regs[] = {
+	CRTC_REG(PV_CONTROL),
+	CRTC_REG(PV_V_CONTROL),
+	CRTC_REG(PV_VSYNCD),
+	CRTC_REG(PV_HORZA),
+	CRTC_REG(PV_HORZB),
+	CRTC_REG(PV_VERTA),
+	CRTC_REG(PV_VERTB),
+	CRTC_REG(PV_VERTA_EVEN),
+	CRTC_REG(PV_VERTB_EVEN),
+	CRTC_REG(PV_INTEN),
+	CRTC_REG(PV_INTSTAT),
+	CRTC_REG(PV_STAT),
+	CRTC_REG(PV_HACT_ACT),
+};
+
+static void vc4_crtc_dump_regs(struct vc4_crtc *vc4_crtc)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(crtc_regs); i++) {
+		DRM_INFO("0x%04x (%s): 0x%08x\n",
+			 crtc_regs[i].reg, crtc_regs[i].name,
+			 CRTC_READ(crtc_regs[i].reg));
+	}
+}
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_crtc_debugfs_regs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	int crtc_index = (uintptr_t)node->info_ent->data;
+	struct drm_crtc *crtc;
+	struct vc4_crtc *vc4_crtc;
+	int i;
+
+	i = 0;
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+		if (i == crtc_index)
+			break;
+		i++;
+	}
+	if (!crtc)
+		return 0;
+	vc4_crtc = to_vc4_crtc(crtc);
+
+	for (i = 0; i < ARRAY_SIZE(crtc_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   crtc_regs[i].name, crtc_regs[i].reg,
+			   CRTC_READ(crtc_regs[i].reg));
+	}
+
+	return 0;
+}
+#endif
+
+static void vc4_crtc_destroy(struct drm_crtc *crtc)
+{
+	drm_crtc_cleanup(crtc);
+}
+
+static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
+				const struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static u32 vc4_get_fifo_full_level(u32 format)
+{
+	static const u32 fifo_len_bytes = 64;
+	static const u32 hvs_latency_pix = 6;
+
+	switch (format) {
+	case PV_CONTROL_FORMAT_DSIV_16:
+	case PV_CONTROL_FORMAT_DSIC_16:
+		return fifo_len_bytes - 2 * hvs_latency_pix;
+	case PV_CONTROL_FORMAT_DSIV_18:
+		return fifo_len_bytes - 14;
+	case PV_CONTROL_FORMAT_24:
+	case PV_CONTROL_FORMAT_DSIV_24:
+	default:
+		return fifo_len_bytes - 3 * hvs_latency_pix;
+	}
+}
+
+static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	struct drm_crtc_state *state = crtc->state;
+	struct drm_display_mode *mode = &state->adjusted_mode;
+	u32 vactive = (mode->vdisplay >>
+		       ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0));
+	u32 format = PV_CONTROL_FORMAT_24;
+	bool debug_dump_regs = false;
+
+	if (debug_dump_regs) {
+		DRM_INFO("CRTC %d regs before:\n", drm_crtc_index(crtc));
+		vc4_crtc_dump_regs(vc4_crtc);
+	}
+
+	/* This is where we would set the pixel clock. */
+
+	/* Reset the PV fifo. */
+	CRTC_WRITE(PV_CONTROL, 0);
+	CRTC_WRITE(PV_CONTROL, PV_CONTROL_FIFO_CLR | PV_CONTROL_EN);
+	CRTC_WRITE(PV_CONTROL, 0);
+
+	CRTC_WRITE(PV_HORZA,
+		   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
+				 PV_HORZA_HBP) |
+		   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
+				 PV_HORZA_HSYNC));
+	CRTC_WRITE(PV_HORZB,
+		   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
+				 PV_HORZB_HFP) |
+		   VC4_SET_FIELD(mode->hdisplay, PV_HORZB_HACTIVE));
+
+	CRTC_WRITE(PV_VERTA,
+		   VC4_SET_FIELD(mode->vtotal - mode->vsync_end,
+				 PV_VERTA_VBP) |
+		   VC4_SET_FIELD(mode->vsync_end - mode->vsync_start,
+				 PV_VERTA_VSYNC));
+	CRTC_WRITE(PV_VERTB,
+		   VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
+				 PV_VERTB_VFP) |
+		   VC4_SET_FIELD(vactive, PV_VERTB_VACTIVE));
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
+		/* Write PV_VERTA_EVEN/VERTB_EVEN */
+	}
+
+	CRTC_WRITE(PV_HACT_ACT, mode->hdisplay);
+
+	CRTC_WRITE(PV_V_CONTROL,
+		   PV_VCONTROL_CONTINUOUS);
+
+	CRTC_WRITE(PV_CONTROL,
+		   VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |
+		   VC4_SET_FIELD(vc4_get_fifo_full_level(format),
+				 PV_CONTROL_FIFO_LEVEL) |
+		   PV_CONTROL_CLR_AT_START |
+		   PV_CONTROL_TRIGGER_UNDERFLOW |
+		   PV_CONTROL_WAIT_HSTART |
+		   VC4_SET_FIELD(PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI,
+				 PV_CONTROL_CLK_SELECT) |
+		   PV_CONTROL_FIFO_CLR |
+		   PV_CONTROL_EN);
+
+	if (debug_dump_regs) {
+		DRM_INFO("CRTC %d regs after:\n", drm_crtc_index(crtc));
+		vc4_crtc_dump_regs(vc4_crtc);
+	}
+}
+
+static void
+require_hvs_enabled(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	WARN_ON_ONCE((HVS_READ(SCALER_DISPCTRL) & SCALER_DISPCTRL_ENABLE) !=
+		     SCALER_DISPCTRL_ENABLE);
+}
+
+static void vc4_crtc_disable(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+
+	require_hvs_enabled(dev);
+
+	CRTC_WRITE(PV_V_CONTROL,
+		   CRTC_READ(PV_V_CONTROL) & ~PV_VCONTROL_VIDEN);
+	while (CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_VIDEN)
+		cpu_relax();
+
+	/* Without a wait here, we end up with a black screen. */
+	msleep(30);
+
+	if (HVS_READ(SCALER_DISPCTRLX(vc4_crtc->channel)) &
+	    SCALER_DISPCTRLX_ENABLE) {
+		HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel),
+			  SCALER_DISPCTRLX_RESET);
+
+		/* While the docs say that reset is self-clearing, it
+		 * seems it doesn't actually.
+		 */
+		HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel), 0);
+	}
+
+	/* Once we leave, the scaler should be disabled and its fifo empty. */
+
+	WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(vc4_crtc->channel)) &
+		     SCALER_DISPCTRLX_RESET);
+
+	WARN_ON_ONCE(VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(vc4_crtc->channel)),
+				   SCALER_DISPSTATX_MODE) !=
+		     SCALER_DISPSTATX_MODE_DISABLED);
+
+	WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(vc4_crtc->channel)) &
+		      (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
+		     SCALER_DISPSTATX_EMPTY);
+}
+
+static void vc4_crtc_enable(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	struct drm_crtc_state *state = crtc->state;
+	struct drm_display_mode *mode = &state->adjusted_mode;
+
+	require_hvs_enabled(dev);
+
+	/* Turn on the scaler, which will wait for vstart to start
+	 * compositing.
+	 */
+	HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel),
+		  VC4_SET_FIELD(mode->hdisplay, SCALER_DISPCTRLX_WIDTH) |
+		  VC4_SET_FIELD(mode->vdisplay, SCALER_DISPCTRLX_HEIGHT) |
+		  SCALER_DISPCTRLX_ENABLE);
+
+	/* Turn on the pixel valve, which will emit the vstart signal. */
+	CRTC_WRITE(PV_V_CONTROL,
+		   CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
+}
+
+static int vc4_crtc_atomic_check(struct drm_crtc *crtc,
+				 struct drm_crtc_state *state)
+{
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct drm_plane *plane;
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	u32 dlist_count = 0;
+
+	drm_atomic_crtc_state_for_each_plane(plane, state) {
+		struct drm_plane_state *plane_state =
+			state->state->plane_states[drm_plane_index(plane)];
+
+		/* plane might not have changed, in which case take
+		 * current state:
+		 */
+		if (!plane_state)
+			plane_state = plane->state;
+
+		dlist_count += vc4_plane_dlist_size(plane_state);
+	}
+
+	dlist_count++; /* Account for SCALER_CTL0_END. */
+
+	if (!vc4_crtc->dlist || dlist_count > vc4_crtc->dlist_size) {
+		vc4_crtc->dlist = ((u32 __iomem *)vc4->hvs->dlist +
+				   HVS_BOOTLOADER_DLIST_END);
+		vc4_crtc->dlist_size = ((SCALER_DLIST_SIZE >> 2) -
+					HVS_BOOTLOADER_DLIST_END);
+
+		if (dlist_count > vc4_crtc->dlist_size) {
+			DRM_DEBUG_KMS("dlist too large for CRTC (%d > %d).\n",
+				      dlist_count, vc4_crtc->dlist_size);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static void vc4_crtc_atomic_begin(struct drm_crtc *crtc)
+{
+}
+
+static void vc4_crtc_atomic_flush(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	struct drm_plane *plane;
+	bool debug_dump_regs = false;
+	u32 __iomem *dlist_next = vc4_crtc->dlist;
+
+	if (debug_dump_regs) {
+		DRM_INFO("CRTC %d HVS before:\n", drm_crtc_index(crtc));
+		vc4_hvs_dump_state(dev);
+	}
+
+	/* Copy all the active planes' dlist contents to the hardware dlist.
+	 *
+	 * XXX: If the new display list was large enough that it
+	 * overlapped a currently-read display list, we need to do
+	 * something like disable scanout before putting in the new
+	 * list.  For now, we're safe because we only have the two
+	 * planes.
+	 */
+	drm_atomic_crtc_for_each_plane(plane, crtc) {
+		dlist_next += vc4_plane_write_dlist(plane, dlist_next);
+	}
+
+	if (dlist_next == vc4_crtc->dlist) {
+		/* If no planes were enabled, use the SCALER_CTL0_END
+		 * at the start of the display list memory (in the
+		 * bootloader section).  We'll rewrite that
+		 * SCALER_CTL0_END, just in case, though.
+		 */
+		writel(SCALER_CTL0_END, vc4->hvs->dlist);
+		HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel), 0);
+	} else {
+		writel(SCALER_CTL0_END, dlist_next);
+		dlist_next++;
+
+		HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
+			  (u32 *)vc4_crtc->dlist - (u32 *)vc4->hvs->dlist);
+
+		/* Make the next display list start after ours. */
+		vc4_crtc->dlist_size -= (dlist_next - vc4_crtc->dlist);
+		vc4_crtc->dlist = dlist_next;
+	}
+
+	if (debug_dump_regs) {
+		DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
+		vc4_hvs_dump_state(dev);
+	}
+
+	if (crtc->state->event) {
+		unsigned long flags;
+
+		crtc->state->event->pipe = drm_crtc_index(crtc);
+
+		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+
+		spin_lock_irqsave(&dev->event_lock, flags);
+		vc4_crtc->event = crtc->state->event;
+		spin_unlock_irqrestore(&dev->event_lock, flags);
+		crtc->state->event = NULL;
+	}
+}
+
+int vc4_enable_vblank(struct drm_device *dev, int crtc_id)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc *vc4_crtc = vc4->crtc[crtc_id];
+
+	CRTC_WRITE(PV_INTEN, PV_INT_VFP_START);
+
+	return 0;
+}
+
+void vc4_disable_vblank(struct drm_device *dev, int crtc_id)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc *vc4_crtc = vc4->crtc[crtc_id];
+
+	CRTC_WRITE(PV_INTEN, 0);
+}
+
+static void
+vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
+{
+	struct drm_crtc *crtc = &vc4_crtc->base;
+	struct drm_device *dev = crtc->dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+	if (vc4_crtc->event) {
+		drm_crtc_send_vblank_event(crtc, vc4_crtc->event);
+		vc4_crtc->event = NULL;
+	}
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+static irqreturn_t vc4_crtc_irq_handler(int irq, void *data)
+{
+	struct vc4_crtc *vc4_crtc = data;
+	u32 stat = CRTC_READ(PV_INTSTAT);
+	irqreturn_t ret = IRQ_NONE;
+
+	if (stat & PV_INT_VFP_START) {
+		CRTC_WRITE(PV_INTSTAT, PV_INT_VFP_START);
+		drm_crtc_handle_vblank(&vc4_crtc->base);
+		vc4_crtc_handle_page_flip(vc4_crtc);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static const struct drm_crtc_funcs vc4_crtc_funcs = {
+	.set_config = drm_atomic_helper_set_config,
+	.destroy = vc4_crtc_destroy,
+	.page_flip = drm_atomic_helper_page_flip,
+	.set_property = NULL,
+	.cursor_set = NULL, /* handled by drm_mode_cursor_universal */
+	.cursor_move = NULL, /* handled by drm_mode_cursor_universal */
+	.reset = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
+	.mode_fixup = vc4_crtc_mode_fixup,
+	.mode_set_nofb = vc4_crtc_mode_set_nofb,
+	.disable = vc4_crtc_disable,
+	.enable = vc4_crtc_enable,
+	.atomic_check = vc4_crtc_atomic_check,
+	.atomic_begin = vc4_crtc_atomic_begin,
+	.atomic_flush = vc4_crtc_atomic_flush,
+};
+
+/* Frees the page flip event when the DRM device is closed with the
+ * event still outstanding.
+ */
+void vc4_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file)
+{
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+
+	if (vc4_crtc->event && vc4_crtc->event->base.file_priv == file) {
+		vc4_crtc->event->base.destroy(&vc4_crtc->event->base);
+		drm_crtc_vblank_put(crtc);
+		vc4_crtc->event = NULL;
+	}
+
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
+	struct vc4_crtc *vc4_crtc;
+	struct drm_crtc *crtc;
+	struct drm_plane *primary_plane, *cursor_plane;
+	int ret;
+
+	primary_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_PRIMARY);
+	if (!primary_plane) {
+		dev_err(dev, "failed to construct primary plane\n");
+		ret = PTR_ERR(primary_plane);
+		goto fail;
+	}
+
+	cursor_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_CURSOR);
+	if (!cursor_plane) {
+		dev_err(dev, "failed to construct cursor plane\n");
+		ret = PTR_ERR(cursor_plane);
+		goto fail;
+	}
+
+	vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
+	if (!vc4_crtc)
+		return -ENOMEM;
+	crtc = &vc4_crtc->base;
+
+	vc4_crtc->regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(vc4_crtc->regs))
+		return PTR_ERR(vc4_crtc->regs);
+
+	drm_crtc_init_with_planes(drm, crtc, primary_plane, cursor_plane,
+				  &vc4_crtc_funcs);
+	drm_crtc_helper_add(crtc, &vc4_crtc_helper_funcs);
+	primary_plane->crtc = crtc;
+	cursor_plane->crtc = crtc;
+	vc4->crtc[drm_crtc_index(crtc)] = vc4_crtc;
+
+	/* Until we have full scanout setup to route things through to
+	 * encoders, line things up like the firmware did.
+	 */
+	switch (drm_crtc_index(crtc)) {
+	case 0:
+		vc4_crtc->channel = 0;
+		break;
+	case 1:
+		vc4_crtc->channel = 2;
+		break;
+	default:
+	case 2:
+		vc4_crtc->channel = 1;
+		break;
+	}
+
+	CRTC_WRITE(PV_INTEN, 0);
+	CRTC_WRITE(PV_INTSTAT, PV_INT_VFP_START);
+	ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
+			       vc4_crtc_irq_handler, 0, "vc4 crtc", vc4_crtc);
+
+	platform_set_drvdata(pdev, vc4_crtc);
+
+	return 0;
+
+fail:
+	return ret;
+}
+
+static void vc4_crtc_unbind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct vc4_crtc *vc4_crtc = dev_get_drvdata(dev);
+
+	vc4_crtc_destroy(&vc4_crtc->base);
+
+	CRTC_WRITE(PV_INTEN, 0);
+
+	platform_set_drvdata(pdev, NULL);
+}
+
+static const struct component_ops vc4_crtc_ops = {
+	.bind   = vc4_crtc_bind,
+	.unbind = vc4_crtc_unbind,
+};
+
+static int vc4_crtc_dev_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &vc4_crtc_ops);
+}
+
+static int vc4_crtc_dev_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &vc4_crtc_ops);
+	return 0;
+}
+
+static const struct of_device_id vc4_crtc_dt_match[] = {
+	{ .compatible = "brcm,vc4-pixelvalve" },
+	{}
+};
+
+static struct platform_driver vc4_crtc_driver = {
+	.probe = vc4_crtc_dev_probe,
+	.remove = vc4_crtc_dev_remove,
+	.driver = {
+		.name = "vc4_crtc",
+		.of_match_table = vc4_crtc_dt_match,
+	},
+};
+
+void __init vc4_crtc_register(void)
+{
+	platform_driver_register(&vc4_crtc_driver);
+}
+
+void __exit vc4_crtc_unregister(void)
+{
+	platform_driver_unregister(&vc4_crtc_driver);
+}
diff --git a/drivers/gpu/drm/vc4/vc4_debugfs.c b/drivers/gpu/drm/vc4/vc4_debugfs.c
new file mode 100644
index 0000000..c557039
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_debugfs.c
@@ -0,0 +1,38 @@
+/*
+ *  Copyright ? 2014 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/seq_file.h>
+#include <linux/circ_buf.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+#include <drm/drmP.h>
+
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+static const struct drm_info_list vc4_debugfs_list[] = {
+	{"hdmi_regs", vc4_hdmi_debugfs_regs, 0},
+	{"hvs_regs", vc4_hvs_debugfs_regs, 0},
+	{"crtc0_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)0},
+	{"crtc1_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)1},
+	{"crtc2_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)2},
+};
+#define VC4_DEBUGFS_ENTRIES ARRAY_SIZE(vc4_debugfs_list)
+
+int
+vc4_debugfs_init(struct drm_minor *minor)
+{
+	return drm_debugfs_create_files(vc4_debugfs_list, VC4_DEBUGFS_ENTRIES,
+					minor->debugfs_root, minor);
+}
+
+void
+vc4_debugfs_cleanup(struct drm_minor *minor)
+{
+	drm_debugfs_remove_files(vc4_debugfs_list, VC4_DEBUGFS_ENTRIES, minor);
+}
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
new file mode 100644
index 0000000..9ecf4b8b
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (C) 2014-2015 Broadcom
+ * Copyright (C) 2013 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define DRIVER_NAME "vc4"
+#define DRIVER_DESC "Broadcom VC4 graphics"
+#define DRIVER_DATE "20140616"
+#define DRIVER_MAJOR 0
+#define DRIVER_MINOR 0
+#define DRIVER_PATCHLEVEL 0
+
+/* Helper function for mapping the regs on a platform device.
+ *
+ * We assume only one register range per device, so we use index 0.
+ */
+void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index)
+{
+	struct resource *res;
+	void __iomem *map;
+
+	res = platform_get_resource(dev, IORESOURCE_MEM, index);
+	map = devm_ioremap_resource(&dev->dev, res);
+	if (IS_ERR(map)) {
+		DRM_ERROR("Failed to map registers: %ld\n", PTR_ERR(map));
+		return map;
+	}
+
+	return map;
+}
+
+static int vc4_drm_load(struct drm_device *dev, unsigned long flags)
+{
+	struct vc4_dev *vc4;
+	int ret;
+
+	vc4 = devm_kzalloc(dev->dev, sizeof(*vc4), GFP_KERNEL);
+	if (!vc4)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev->dev, dev);
+	vc4->dev = dev;
+	dev->dev_private = vc4;
+
+	drm_mode_config_init(dev);
+
+	ret = component_bind_all(dev->dev, dev);
+	if (ret)
+		return ret;
+
+	vc4_kms_load(dev);
+
+	return 0;
+}
+
+static int vc4_drm_unload(struct drm_device *dev)
+{
+	drm_mode_config_cleanup(dev);
+
+	component_unbind_all(dev->dev, dev);
+
+	return 0;
+}
+
+static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+		vc4_cancel_page_flip(crtc, file);
+}
+
+static const struct file_operations vc4_drm_fops = {
+	.owner = THIS_MODULE,
+	.open = drm_open,
+	.release = drm_release,
+	.unlocked_ioctl = drm_ioctl,
+	.mmap = drm_gem_cma_mmap,
+	.poll = drm_poll,
+	.read = drm_read,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = drm_compat_ioctl,
+#endif
+	.llseek = noop_llseek,
+};
+
+static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
+};
+
+static struct drm_driver vc4_drm_driver = {
+	.driver_features = (DRIVER_MODESET |
+			    DRIVER_ATOMIC |
+			    DRIVER_GEM |
+			    DRIVER_PRIME),
+	.load = vc4_drm_load,
+	.unload = vc4_drm_unload,
+	.set_busid = drm_platform_set_busid,
+	.preclose = vc4_drm_preclose,
+
+	.enable_vblank = vc4_enable_vblank,
+	.disable_vblank = vc4_disable_vblank,
+	.get_vblank_counter = drm_vblank_count,
+
+#if defined(CONFIG_DEBUG_FS)
+	.debugfs_init = vc4_debugfs_init,
+	.debugfs_cleanup = vc4_debugfs_cleanup,
+#endif
+
+	.gem_free_object = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
+
+	.dumb_create = vc4_dumb_create,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.dumb_destroy = drm_gem_dumb_destroy,
+
+	.ioctls = vc4_drm_ioctls,
+	.num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
+	.fops = &vc4_drm_fops,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+};
+
+static int vc4_drm_bind(struct device *dev)
+{
+	return drm_platform_init(&vc4_drm_driver, to_platform_device(dev));
+}
+
+static void vc4_drm_unbind(struct device *dev)
+{
+	drm_put_dev(platform_get_drvdata(to_platform_device(dev)));
+}
+
+static const struct component_master_ops vc4_drm_ops = {
+	.bind = vc4_drm_bind,
+	.unbind = vc4_drm_unbind,
+};
+
+static int compare_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+static int add_components(struct device *dev, struct component_match **matchptr,
+			  const char *name)
+{
+	struct device_node *np = dev->of_node;
+	unsigned i;
+
+	for (i = 0; ; i++) {
+		struct device_node *node;
+
+		node = of_parse_phandle(np, name, i);
+		if (!node)
+			break;
+
+		component_match_add(dev, matchptr, compare_of, node);
+	}
+
+	return 0;
+}
+
+static int vc4_platform_drm_probe(struct platform_device *pdev)
+{
+	struct component_match *match = NULL;
+
+	add_components(&pdev->dev, &match, "crtcs");
+	add_components(&pdev->dev, &match, "encoders");
+	add_components(&pdev->dev, &match, "hvss");
+
+	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+	return component_master_add_with_match(&pdev->dev, &vc4_drm_ops, match);
+}
+
+static int vc4_platform_drm_remove(struct platform_device *pdev)
+{
+	drm_put_dev(platform_get_drvdata(pdev));
+
+	return 0;
+}
+
+static const struct of_device_id vc4_of_match[] = {
+	{ .compatible = "brcm,vc4", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, vc4_of_match);
+
+static struct platform_driver vc4_platform_driver = {
+	.probe		= vc4_platform_drm_probe,
+	.remove		= vc4_platform_drm_remove,
+	.driver		= {
+		.name	= "vc4-drm",
+		.owner	= THIS_MODULE,
+		.of_match_table = vc4_of_match,
+	},
+};
+
+static int __init vc4_drm_register(void)
+{
+	vc4_hdmi_register();
+	vc4_crtc_register();
+	vc4_hvs_register();
+	return platform_driver_register(&vc4_platform_driver);
+}
+
+static void __exit vc4_drm_unregister(void)
+{
+	platform_driver_unregister(&vc4_platform_driver);
+	vc4_hvs_unregister();
+	vc4_crtc_unregister();
+	vc4_hdmi_unregister();
+}
+
+module_init(vc4_drm_register);
+module_exit(vc4_drm_unregister);
+
+MODULE_ALIAS("platform:vc4-drm");
+MODULE_DESCRIPTION("Broadcom VC4 DRM Driver");
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
new file mode 100644
index 0000000..1b0a0b0
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "drmP.h"
+#include "drm_gem_cma_helper.h"
+
+struct vc4_dev {
+	struct drm_device *dev;
+
+	struct vc4_hdmi *hdmi;
+	struct vc4_hvs *hvs;
+	struct vc4_crtc *crtc[3];
+};
+
+static inline struct vc4_dev *
+to_vc4_dev(struct drm_device *dev)
+{
+	return (struct vc4_dev *)dev->dev_private;
+}
+
+struct vc4_bo {
+	struct drm_gem_cma_object base;
+};
+
+static inline struct vc4_bo *
+to_vc4_bo(struct drm_gem_object *bo)
+{
+	return (struct vc4_bo *)bo;
+}
+
+struct vc4_hvs {
+	struct platform_device *pdev;
+	void __iomem *regs;
+	void __iomem *dlist;
+};
+
+struct vc4_crtc {
+	struct drm_crtc base;
+	void __iomem *regs;
+
+	/* Which HVS channel we're using for our CRTC. */
+	int channel;
+
+	/* Pointer to the actual hardware display list memory for the
+	 * crtc.
+	 */
+	u32 __iomem *dlist;
+
+	u32 dlist_size; /* in dwords */
+
+	struct drm_pending_vblank_event *event;
+};
+
+static inline struct vc4_crtc *
+to_vc4_crtc(struct drm_crtc *crtc)
+{
+	return (struct vc4_crtc *)crtc;
+}
+
+struct vc4_plane {
+	struct drm_plane base;
+};
+
+static inline struct vc4_plane *
+to_vc4_plane(struct drm_plane *plane)
+{
+	return (struct vc4_plane *)plane;
+}
+
+#define HVS_READ(offset) readl(vc4->hvs->regs + offset)
+#define HVS_WRITE(offset, val) writel(val, vc4->hvs->regs + offset)
+
+/* vc4_bo.c */
+void vc4_free_object(struct drm_gem_object *gem_obj);
+struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size);
+int vc4_dumb_create(struct drm_file *file_priv,
+		    struct drm_device *dev,
+		    struct drm_mode_create_dumb *args);
+struct dma_buf *vc4_prime_export(struct drm_device *dev,
+				 struct drm_gem_object *obj, int flags);
+
+/* vc4_crtc.c */
+void vc4_crtc_register(void);
+void vc4_crtc_unregister(void);
+int vc4_enable_vblank(struct drm_device *dev, int crtc_id);
+void vc4_disable_vblank(struct drm_device *dev, int crtc_id);
+void vc4_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
+int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg);
+
+/* vc4_debugfs.c */
+int vc4_debugfs_init(struct drm_minor *minor);
+void vc4_debugfs_cleanup(struct drm_minor *minor);
+
+/* vc4_drv.c */
+void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index);
+
+/* vc4_hdmi.c */
+void vc4_hdmi_register(void);
+void vc4_hdmi_unregister(void);
+struct drm_encoder *vc4_hdmi_encoder_init(struct drm_device *dev);
+struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
+					      struct drm_encoder *encoder);
+int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused);
+
+/* vc4_hvs.c */
+void vc4_hvs_register(void);
+void vc4_hvs_unregister(void);
+void vc4_hvs_dump_state(struct drm_device *dev);
+int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused);
+
+/* vc4_kms.c */
+int vc4_kms_load(struct drm_device *dev);
+
+/* vc4_plane.c */
+struct drm_plane *vc4_plane_init(struct drm_device *dev,
+				 enum drm_plane_type type);
+u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist);
+u32 vc4_plane_dlist_size(struct drm_plane_state *state);
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
new file mode 100644
index 0000000..c1ac96e
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -0,0 +1,651 @@
+/*
+ * Copyright (c) 2014 The Linux Foundation. All rights reserved.
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "drm_atomic_helper.h"
+#include "drm_crtc_helper.h"
+#include "drm_edid.h"
+#include "linux/clk.h"
+#include "linux/component.h"
+#include "linux/of_gpio.h"
+#include "linux/of_platform.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+/* General HDMI hardware state. */
+struct vc4_hdmi {
+	struct platform_device *pdev;
+	struct i2c_adapter *ddc;
+	void __iomem *hdmicore_regs;
+	void __iomem *hd_regs;
+	int hpd_gpio;
+
+	/* Probed video mode at boot time, used to filter display
+	 * modes to only allow equivalent ones (since we can't set the
+	 * pixel clock yet).
+	 */
+	struct drm_display_mode boot_mode;
+};
+#define HDMI_READ(offset) readl(vc4->hdmi->hdmicore_regs + offset)
+#define HDMI_WRITE(offset, val) writel(val, vc4->hdmi->hdmicore_regs + offset)
+#define HD_READ(offset) readl(vc4->hdmi->hd_regs + offset)
+#define HD_WRITE(offset, val) writel(val, vc4->hdmi->hd_regs + offset)
+
+/* VC4 HDMI encoder KMS struct */
+struct vc4_hdmi_encoder {
+	struct drm_encoder base;
+	bool hdmi_monitor;
+};
+static inline struct vc4_hdmi_encoder *
+to_vc4_hdmi_encoder(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct vc4_hdmi_encoder, base);
+}
+
+/* VC4 HDMI connector KMS struct */
+struct vc4_hdmi_connector {
+	struct drm_connector base;
+
+	/* Since the connector is attached to just the one encoder,
+	 * this is the reference to it so we can do the best_encoder()
+	 * hook.
+	 */
+	struct drm_encoder *encoder;
+};
+static inline struct vc4_hdmi_connector *
+to_vc4_hdmi_connector(struct drm_connector *connector)
+{
+	return container_of(connector, struct vc4_hdmi_connector, base);
+}
+
+#define HDMI_REG(reg) { reg, #reg }
+static const struct {
+	u32 reg;
+	const char *name;
+} hdmi_regs[] = {
+	HDMI_REG(VC4_HDMI_CORE_REV),
+	HDMI_REG(VC4_HDMI_SW_RESET_CONTROL),
+	HDMI_REG(VC4_HDMI_HOTPLUG_INT),
+	HDMI_REG(VC4_HDMI_HOTPLUG),
+	HDMI_REG(VC4_HDMI_HORZA),
+	HDMI_REG(VC4_HDMI_HORZB),
+	HDMI_REG(VC4_HDMI_FIFO_CTL),
+	HDMI_REG(VC4_HDMI_SCHEDULER_CONTROL),
+	HDMI_REG(VC4_HDMI_VERTA0),
+	HDMI_REG(VC4_HDMI_VERTA1),
+	HDMI_REG(VC4_HDMI_VERTB0),
+	HDMI_REG(VC4_HDMI_VERTB1),
+	HDMI_REG(VC4_HDMI_TX_PHY_RESET_CTL),
+};
+static const struct {
+	u32 reg;
+	const char *name;
+} hd_regs[] = {
+	HDMI_REG(VC4_HD_M_CTL),
+	HDMI_REG(VC4_HD_MAI_CTL),
+	HDMI_REG(VC4_HD_VID_CTL),
+	HDMI_REG(VC4_HD_CSC_CTL),
+	HDMI_REG(VC4_HD_FRAME_COUNT),
+};
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   hdmi_regs[i].name, hdmi_regs[i].reg,
+			   HDMI_READ(hdmi_regs[i].reg));
+	}
+
+	for (i = 0; i < ARRAY_SIZE(hd_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   hd_regs[i].name, hd_regs[i].reg,
+			   HD_READ(hd_regs[i].reg));
+	}
+
+	return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static void vc4_hdmi_dump_regs(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) {
+		DRM_INFO("0x%04x (%s): 0x%08x\n",
+			 hdmi_regs[i].reg, hdmi_regs[i].name,
+			 HDMI_READ(hdmi_regs[i].reg));
+	}
+	for (i = 0; i < ARRAY_SIZE(hd_regs); i++) {
+		DRM_INFO("0x%04x (%s): 0x%08x\n",
+			 hd_regs[i].reg, hd_regs[i].name,
+			 HD_READ(hd_regs[i].reg));
+	}
+}
+
+static enum drm_connector_status
+vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct drm_device *dev = connector->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->hdmi->hpd_gpio) {
+		if (gpio_get_value(vc4->hdmi->hpd_gpio))
+			return connector_status_connected;
+		else
+			return connector_status_disconnected;
+	}
+
+	if (HDMI_READ(VC4_HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
+		return connector_status_connected;
+	else
+		return connector_status_disconnected;
+}
+
+static void vc4_hdmi_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
+{
+	struct vc4_hdmi_connector *vc4_connector =
+		to_vc4_hdmi_connector(connector);
+	struct drm_encoder *encoder = vc4_connector->encoder;
+	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
+	struct drm_device *dev = connector->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int ret = 0;
+	struct edid *edid;
+
+	edid = drm_get_edid(connector, vc4->hdmi->ddc);
+	if (!edid)
+		return -ENODEV;
+
+	vc4_encoder->hdmi_monitor = drm_detect_hdmi_monitor(edid);
+	drm_mode_connector_update_edid_property(connector, edid);
+	ret = drm_add_edid_modes(connector, edid);
+
+	return ret;
+}
+
+/* Since we can't set the pixel clock yet, filter out all the EDID
+ * modes that don't match what was set up by the firmware.
+ */
+int vc4_hdmi_mode_valid(struct drm_connector *connector,
+			struct drm_display_mode *mode)
+{
+	struct drm_device *dev = connector->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct drm_display_mode *boot_mode = &vc4->hdmi->boot_mode;
+
+	if (mode->hdisplay != boot_mode->hdisplay ||
+	    mode->hsync_start != boot_mode->hsync_start ||
+	    mode->hsync_end != boot_mode->hsync_end ||
+	    mode->htotal != boot_mode->htotal) {
+		return MODE_ERROR;
+	}
+
+	return MODE_OK;
+}
+
+static struct drm_encoder *
+vc4_hdmi_connector_best_encoder(struct drm_connector *connector)
+{
+	struct vc4_hdmi_connector *hdmi_connector =
+		to_vc4_hdmi_connector(connector);
+	return hdmi_connector->encoder;
+}
+
+static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.detect = vc4_hdmi_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = vc4_hdmi_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = {
+	.get_modes = vc4_hdmi_connector_get_modes,
+	.mode_valid = vc4_hdmi_mode_valid,
+	.best_encoder = vc4_hdmi_connector_best_encoder,
+};
+
+struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
+					      struct drm_encoder *encoder)
+{
+	struct drm_connector *connector = NULL;
+	struct vc4_hdmi_connector *hdmi_connector;
+	int ret = 0;
+
+	hdmi_connector = devm_kzalloc(dev->dev, sizeof(*hdmi_connector),
+				      GFP_KERNEL);
+	if (!hdmi_connector) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+	connector = &hdmi_connector->base;
+
+	hdmi_connector->encoder = encoder;
+
+	drm_connector_init(dev, connector, &vc4_hdmi_connector_funcs,
+			   DRM_MODE_CONNECTOR_HDMIA);
+	drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs);
+
+	connector->polled = (DRM_CONNECTOR_POLL_CONNECT |
+			     DRM_CONNECTOR_POLL_DISCONNECT);
+
+	connector->interlace_allowed = 0;
+	connector->doublescan_allowed = 0;
+
+	drm_connector_register(connector);
+
+	drm_mode_connector_attach_encoder(connector, encoder);
+
+	return connector;
+
+ fail:
+	if (connector)
+		vc4_hdmi_connector_destroy(connector);
+
+	return ERR_PTR(ret);
+}
+
+static void vc4_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs vc4_hdmi_encoder_funcs = {
+	.destroy = vc4_encoder_destroy,
+};
+
+static bool vc4_hdmi_encoder_mode_fixup(struct drm_encoder *encoder,
+					const struct drm_display_mode *mode,
+					struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
+				      struct drm_display_mode *unadjusted_mode,
+				      struct drm_display_mode *mode)
+{
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	bool debug_dump_regs = false;
+	bool hsync_pos = !(mode->flags & DRM_MODE_FLAG_NHSYNC);
+	bool vsync_pos = !(mode->flags & DRM_MODE_FLAG_NVSYNC);
+	u32 vactive = (mode->vdisplay >>
+		       ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0));
+	u32 verta = (VC4_SET_FIELD(mode->vsync_end - mode->vsync_start,
+				   VC4_HDMI_VERTA_VSP) |
+		     VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
+				   VC4_HDMI_VERTA_VFP) |
+		     VC4_SET_FIELD(vactive, VC4_HDMI_VERTA_VAL));
+	u32 vertb = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
+		     VC4_SET_FIELD(mode->vtotal - mode->vsync_end,
+				   VC4_HDMI_VERTB_VBP));
+
+	if (debug_dump_regs) {
+		DRM_INFO("HDMI regs before:\n");
+		vc4_hdmi_dump_regs(dev);
+	}
+
+	HD_WRITE(VC4_HD_VID_CTL, 0);
+
+	/* XXX: This is where we would set the HDMI state machine
+	 * clock, if we had an interface for it.
+	 */
+
+	HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+		   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
+		   VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT |
+		   VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS);
+
+	HDMI_WRITE(VC4_HDMI_HORZA,
+		   (vsync_pos ? VC4_HDMI_HORZA_VPOS : 0) |
+		   (hsync_pos ? VC4_HDMI_HORZA_HPOS : 0) |
+		   VC4_SET_FIELD(mode->hdisplay, VC4_HDMI_HORZA_HAP));
+
+	HDMI_WRITE(VC4_HDMI_HORZB,
+		   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
+				 VC4_HDMI_HORZB_HBP) |
+		   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
+				 VC4_HDMI_HORZB_HSP) |
+		   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
+				 VC4_HDMI_HORZB_HFP));
+
+	HDMI_WRITE(VC4_HDMI_VERTA0, verta);
+	HDMI_WRITE(VC4_HDMI_VERTA1, verta);
+
+	HDMI_WRITE(VC4_HDMI_VERTB0, vertb);
+	HDMI_WRITE(VC4_HDMI_VERTB1, vertb);
+
+	HD_WRITE(VC4_HD_VID_CTL,
+		 (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
+		 (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
+
+	/* The RGB order applies even when CSC is disabled. */
+	HD_WRITE(VC4_HD_CSC_CTL, VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
+					       VC4_HD_CSC_CTL_ORDER));
+
+	HDMI_WRITE(VC4_HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
+
+	if (debug_dump_regs) {
+		DRM_INFO("HDMI regs after:\n");
+		vc4_hdmi_dump_regs(dev);
+	}
+}
+
+static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
+	HD_WRITE(VC4_HD_VID_CTL,
+		 HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
+}
+
+static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0);
+
+	HD_WRITE(VC4_HD_VID_CTL,
+		 HD_READ(VC4_HD_VID_CTL) |
+		 VC4_HD_VID_CTL_ENABLE |
+		 VC4_HD_VID_CTL_UNDERFLOW_ENABLE |
+		 VC4_HD_VID_CTL_FRAME_COUNTER_RESET);
+
+	if (vc4_encoder->hdmi_monitor) {
+		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
+			   VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
+
+		while (!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+			 VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE)) {
+			cpu_relax();
+		}
+	} else {
+		HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG,
+			   HDMI_READ(VC4_HDMI_RAM_PACKET_CONFIG) &
+			   ~(VC4_HDMI_RAM_PACKET_ENABLE));
+		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+			   ~VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
+
+		while (HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+		       VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE) {
+			cpu_relax();
+		}
+	}
+
+	if (vc4_encoder->hdmi_monitor) {
+		u32 drift;
+
+		WARN_ON(!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+			  VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE));
+		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
+			   VC4_HDMI_SCHEDULER_CONTROL_VERT_ALWAYS_KEEPOUT);
+
+		/* XXX: Set HDMI_RAM_PACKET_CONFIG (1 << 16) and set
+		 * up the infoframe.
+		 */
+
+		drift = HDMI_READ(VC4_HDMI_FIFO_CTL);
+		drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK;
+
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift | VC4_HDMI_FIFO_CTL_RECENTER);
+		udelay(1000);
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift | VC4_HDMI_FIFO_CTL_RECENTER);
+
+		while ((HDMI_READ(VC4_HDMI_FIFO_CTL) &
+			VC4_HDMI_FIFO_CTL_RECENTER_DONE) == 0) {
+			cpu_relax();
+		}
+	}
+}
+
+static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
+	.mode_fixup = vc4_hdmi_encoder_mode_fixup,
+	.mode_set = vc4_hdmi_encoder_mode_set,
+	.disable = vc4_hdmi_encoder_disable,
+	.enable = vc4_hdmi_encoder_enable,
+};
+
+static struct drm_crtc *
+vc4_get_crtc_node(struct platform_device *pdev)
+{
+	struct device_node *crtc_node;
+	struct platform_device *crtc_pdev;
+
+	crtc_node = of_parse_phandle(pdev->dev.of_node, "crtc", 0);
+	if (!crtc_node) {
+		DRM_ERROR("No CRTC for hdmi in DT\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	crtc_pdev = of_find_device_by_node(crtc_node);
+	if (!crtc_pdev) {
+		DRM_ERROR("No CRTC device attached to OF node\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	return platform_get_drvdata(crtc_pdev);
+}
+
+struct drm_encoder *vc4_hdmi_encoder_init(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct drm_encoder *encoder = NULL;
+	struct vc4_hdmi_encoder *vc4_hdmi_encoder;
+	struct drm_crtc *crtc;
+	int ret;
+
+	vc4_hdmi_encoder = devm_kzalloc(dev->dev, sizeof(*vc4_hdmi_encoder),
+					GFP_KERNEL);
+	if (!vc4_hdmi_encoder) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+	encoder = &vc4_hdmi_encoder->base;
+
+	crtc = vc4_get_crtc_node(vc4->hdmi->pdev);
+	if (IS_ERR(crtc)) {
+		ret = PTR_ERR(crtc);
+		goto fail;
+	}
+
+	drm_encoder_init(dev, encoder, &vc4_hdmi_encoder_funcs,
+			 DRM_MODE_ENCODER_TMDS);
+	drm_encoder_helper_add(encoder, &vc4_hdmi_encoder_helper_funcs);
+
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	return encoder;
+
+fail:
+	if (encoder)
+		vc4_encoder_destroy(encoder);
+
+	return ERR_PTR(ret);
+}
+
+/* Reads out the current HDMI mode progreamming at driver load time.
+ *
+ * This is currently used for later filtering out of the DDC-probed
+ * video modes, since we can't actually change modes due to not having
+ * control of the necessary clocks.  Later on, we may end up reusing
+ * this for skipping modesets at boot time.
+ */
+static void
+vc4_hdmi_get_boot_display_mode(struct vc4_dev *vc4)
+{
+	struct drm_display_mode *mode = &vc4->hdmi->boot_mode;
+	u32 horza = HDMI_READ(VC4_HDMI_HORZA);
+	u32 horzb = HDMI_READ(VC4_HDMI_HORZB);
+	u32 verta = HDMI_READ(VC4_HDMI_VERTA0);
+	u32 vertb = HDMI_READ(VC4_HDMI_VERTB0);
+
+	memset(mode, 0, sizeof(*mode));
+
+	if (!(horza & VC4_HDMI_HORZA_VPOS))
+		mode->flags |= DRM_MODE_FLAG_NVSYNC;
+	if (!(horza & VC4_HDMI_HORZA_HPOS))
+		mode->flags |= DRM_MODE_FLAG_NHSYNC;
+	mode->hdisplay = VC4_GET_FIELD(horza, VC4_HDMI_HORZA_HAP);
+	mode->hsync_start = (mode->hdisplay +
+			     VC4_GET_FIELD(horzb, VC4_HDMI_HORZB_HFP));
+	mode->hsync_end = (mode->hsync_start +
+			   VC4_GET_FIELD(horzb, VC4_HDMI_HORZB_HSP));
+	mode->htotal = (mode->hsync_end +
+			VC4_GET_FIELD(horzb, VC4_HDMI_HORZB_HBP));
+
+	mode->vdisplay = VC4_GET_FIELD(verta, VC4_HDMI_VERTA_VAL);
+	mode->vsync_start = (mode->vdisplay +
+			     VC4_GET_FIELD(verta, VC4_HDMI_VERTA_VFP));
+	mode->vsync_end = (mode->vsync_start +
+			   VC4_GET_FIELD(verta, VC4_HDMI_VERTA_VSP));
+	mode->vtotal = (mode->vsync_end +
+			VC4_GET_FIELD(vertb, VC4_HDMI_VERTB_VBP));
+}
+
+static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = drm->dev_private;
+	struct vc4_hdmi *hdmi;
+	struct device_node *ddc_node;
+	u32 value;
+
+	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
+	if (!hdmi)
+		return -ENOMEM;
+
+	hdmi->pdev = pdev;
+	hdmi->hdmicore_regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(hdmi->hdmicore_regs))
+		return PTR_ERR(hdmi->hdmicore_regs);
+
+	hdmi->hd_regs = vc4_ioremap_regs(pdev, 1);
+	if (IS_ERR(hdmi->hd_regs))
+		return PTR_ERR(hdmi->hd_regs);
+
+	/* DDC i2c driver */
+	ddc_node = of_parse_phandle(dev->of_node, "ddc", 0);
+	if (!ddc_node) {
+		DRM_ERROR("Failed to find ddc node in device tree\n");
+		return -ENODEV;
+	}
+
+	hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node);
+	if (!hdmi->ddc) {
+		DRM_ERROR("Failed to get ddc i2c adapter by node\n");
+		return -EPROBE_DEFER;
+	}
+
+	/* Only use the GPIO HPD pin if present in the DT, otherwise
+	 * we'll use the HDMI core's register.
+	 */
+	if (of_find_property(dev->of_node, "hpd-gpio", &value)) {
+		hdmi->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpio", 0);
+		if (hdmi->hpd_gpio < 0)
+			return hdmi->hpd_gpio;
+	}
+
+	vc4->hdmi = hdmi;
+
+	/* HDMI core must be enabled. */
+	WARN_ON_ONCE((HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE) == 0);
+
+	vc4_hdmi_get_boot_display_mode(vc4);
+
+	return 0;
+}
+
+static void vc4_hdmi_unbind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = drm->dev_private;
+
+	put_device(&vc4->hdmi->ddc->dev);
+
+	vc4->hdmi = NULL;
+}
+
+static const struct component_ops vc4_hdmi_ops = {
+	.bind   = vc4_hdmi_bind,
+	.unbind = vc4_hdmi_unbind,
+};
+
+static int vc4_hdmi_dev_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &vc4_hdmi_ops);
+}
+
+static int vc4_hdmi_dev_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &vc4_hdmi_ops);
+	return 0;
+}
+
+static const struct of_device_id vc4_hdmi_dt_match[] = {
+	{ .compatible = "brcm,vc4-hdmi" },
+	{}
+};
+
+static struct platform_driver vc4_hdmi_driver = {
+	.probe = vc4_hdmi_dev_probe,
+	.remove = vc4_hdmi_dev_remove,
+	.driver = {
+		.name = "vc4_hdmi",
+		.of_match_table = vc4_hdmi_dt_match,
+	},
+};
+
+void __init vc4_hdmi_register(void)
+{
+	platform_driver_register(&vc4_hdmi_driver);
+}
+
+void __exit vc4_hdmi_unregister(void)
+{
+	platform_driver_unregister(&vc4_hdmi_driver);
+}
diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
new file mode 100644
index 0000000..dcf4f78
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/**
+ * DOC: VC4 HVS module.
+ *
+ * The HVS is the piece of hardware that does translation, scaling,
+ * colorspace conversion, and compositing of pixels stored in
+ * framebuffers into a FIFO of pixels going out to the Pixel Valve
+ * (CRTC).
+ *
+ * There is a single global HVS, with multiple output FIFOs that can
+ * be consumed by the PVs.  This file just manages the resources for
+ * the HVS, while the vc4_crtc.c code actually drives HVS setup for
+ * each CRTC.
+ */
+
+#include "linux/component.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define HVS_REG(reg) { reg, #reg }
+static const struct {
+	u32 reg;
+	const char *name;
+} hvs_regs[] = {
+	HVS_REG(SCALER_DISPCTRL),
+	HVS_REG(SCALER_DISPSTAT),
+	HVS_REG(SCALER_DISPID),
+	HVS_REG(SCALER_DISPECTRL),
+	HVS_REG(SCALER_DISPPROF),
+	HVS_REG(SCALER_DISPDITHER),
+	HVS_REG(SCALER_DISPEOLN),
+	HVS_REG(SCALER_DISPLIST0),
+	HVS_REG(SCALER_DISPLIST1),
+	HVS_REG(SCALER_DISPLIST2),
+	HVS_REG(SCALER_DISPLSTAT),
+	HVS_REG(SCALER_DISPLACT0),
+	HVS_REG(SCALER_DISPLACT1),
+	HVS_REG(SCALER_DISPLACT2),
+	HVS_REG(SCALER_DISPCTRL0),
+	HVS_REG(SCALER_DISPBKGND0),
+	HVS_REG(SCALER_DISPSTAT0),
+	HVS_REG(SCALER_DISPBASE0),
+	HVS_REG(SCALER_DISPCTRL1),
+	HVS_REG(SCALER_DISPBKGND1),
+	HVS_REG(SCALER_DISPSTAT1),
+	HVS_REG(SCALER_DISPBASE1),
+	HVS_REG(SCALER_DISPCTRL2),
+	HVS_REG(SCALER_DISPBKGND2),
+	HVS_REG(SCALER_DISPSTAT2),
+	HVS_REG(SCALER_DISPBASE2),
+	HVS_REG(SCALER_DISPALPHA2),
+};
+
+void
+vc4_hvs_dump_state(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
+		DRM_INFO("0x%04x (%s): 0x%08x\n",
+			 hvs_regs[i].reg, hvs_regs[i].name,
+			 HVS_READ(hvs_regs[i].reg));
+	}
+
+	DRM_INFO("HVS ctx:\n");
+	for (i = 0; i < 64; i += 4) {
+		DRM_INFO("0x%08x (%s): 0x%08x 0x%08x 0x%08x 0x%08x\n",
+			 i * 4, i < HVS_BOOTLOADER_DLIST_END ? "B" : "D",
+			 ((uint32_t *)vc4->hvs->dlist)[i + 0],
+			 ((uint32_t *)vc4->hvs->dlist)[i + 1],
+			 ((uint32_t *)vc4->hvs->dlist)[i + 2],
+			 ((uint32_t *)vc4->hvs->dlist)[i + 3]);
+	}
+}
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   hvs_regs[i].name, hvs_regs[i].reg,
+			   HVS_READ(hvs_regs[i].reg));
+	}
+
+	return 0;
+}
+#endif
+
+static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = drm->dev_private;
+	struct vc4_hvs *hvs = NULL;
+
+	hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
+	if (!hvs)
+		return -ENOMEM;
+
+	hvs->pdev = pdev;
+
+	hvs->regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(hvs->regs))
+		return PTR_ERR(hvs->regs);
+
+	hvs->dlist = hvs->regs + SCALER_DLIST_START;
+
+	vc4->hvs = hvs;
+	return 0;
+}
+
+static void vc4_hvs_unbind(struct device *dev, struct device *master,
+			   void *data)
+{
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = drm->dev_private;
+
+	vc4->hvs = NULL;
+}
+
+static const struct component_ops vc4_hvs_ops = {
+	.bind   = vc4_hvs_bind,
+	.unbind = vc4_hvs_unbind,
+};
+
+static int vc4_hvs_dev_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &vc4_hvs_ops);
+}
+
+static int vc4_hvs_dev_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &vc4_hvs_ops);
+	return 0;
+}
+
+static const struct of_device_id vc4_hvs_dt_match[] = {
+	{ .compatible = "brcm,vc4-hvs" },
+	{}
+};
+
+static struct platform_driver vc4_hvs_driver = {
+	.probe = vc4_hvs_dev_probe,
+	.remove = vc4_hvs_dev_remove,
+	.driver = {
+		.name = "vc4_hvs",
+		.of_match_table = vc4_hvs_dt_match,
+	},
+};
+
+void __init vc4_hvs_register(void)
+{
+	platform_driver_register(&vc4_hvs_driver);
+}
+
+void __exit vc4_hvs_unregister(void)
+{
+	platform_driver_unregister(&vc4_hvs_driver);
+}
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
new file mode 100644
index 0000000..e5e96bc
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/**
+ * DOC: VC4 KMS
+ *
+ * This is the general code for implementing KMS mode setting that
+ * doesn't clearly associate with any of the other objects (plane,
+ * crtc, HDMI encoder).
+ */
+
+#include "drm_crtc.h"
+#include "drm_atomic_helper.h"
+#include "drm_crtc_helper.h"
+#include "drm_plane_helper.h"
+#include "drm_fb_cma_helper.h"
+#include "vc4_drv.h"
+
+static const struct drm_mode_config_funcs vc4_mode_funcs = {
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+	.fb_create = drm_fb_cma_create,
+};
+
+/* Calls out to initialize all of the VC4 KMS objects. */
+static int vc4_init_modeset_objects(struct drm_device *dev)
+{
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	int ret = 0;
+
+	encoder = vc4_hdmi_encoder_init(dev);
+	if (IS_ERR(encoder)) {
+		dev_err(dev->dev, "failed to construct HDMI encoder\n");
+		ret = PTR_ERR(encoder);
+		goto fail;
+	}
+
+	connector = vc4_hdmi_connector_init(dev, encoder);
+	if (IS_ERR(connector)) {
+		ret = PTR_ERR(connector);
+		dev_err(dev->dev, "failed to initialize HDMI connector\n");
+		goto fail;
+	}
+
+fail:
+	return ret;
+}
+
+int vc4_kms_load(struct drm_device *dev)
+{
+	int ret;
+
+	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	if (ret < 0) {
+		dev_err(dev->dev, "failed to initialize vblank\n");
+		return ret;
+	}
+
+	dev->mode_config.max_width = 2048;
+	dev->mode_config.max_height = 2048;
+	dev->mode_config.funcs = &vc4_mode_funcs;
+	dev->mode_config.preferred_depth = 24;
+
+	ret = vc4_init_modeset_objects(dev);
+	if (ret)
+		goto fail;
+
+	drm_mode_config_reset(dev);
+
+	drm_fbdev_cma_init(dev, 32,
+			   dev->mode_config.num_crtc,
+			   dev->mode_config.num_connector);
+
+	drm_kms_helper_poll_init(dev);
+
+fail:
+	return ret;
+}
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
new file mode 100644
index 0000000..cdd8b10
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -0,0 +1,320 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/**
+ * DOC: VC4 plane module
+ *
+ * Each DRM plane is a layer of pixels being scanned out by the HVS.
+ *
+ * At atomic modeset check time, we compute the HVS display element
+ * state that would be necessary for displaying the plane (giving us a
+ * chance to figure out if a plane configuration is invalid), then at
+ * atomic flush time the CRTC will ask us to write our element state
+ * into the region of the HVS that it has allocated for us.
+ */
+
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+#include "drm_atomic_helper.h"
+#include "drm_fb_cma_helper.h"
+#include "drm_plane_helper.h"
+
+struct vc4_plane_state {
+	struct drm_plane_state base;
+	u32 *dlist;
+	u32 dlist_size; /* Number of dwords in allocated for the display list */
+	u32 dlist_count; /* Number of used dwords in the display list. */
+};
+
+static inline struct vc4_plane_state *
+to_vc4_plane_state(struct drm_plane_state *state)
+{
+	return (struct vc4_plane_state *)state;
+}
+
+static const struct hvs_format {
+	u32 drm; /* DRM_FORMAT_* */
+	u32 hvs; /* HVS_FORMAT_* */
+	u32 pixel_order;
+	bool has_alpha;
+} hvs_formats[] = {
+	{
+		.drm = DRM_FORMAT_XRGB8888, .hvs = HVS_PIXEL_FORMAT_RGBA8888,
+		.pixel_order = HVS_PIXEL_ORDER_ABGR, .has_alpha = false,
+	},
+	{
+		.drm = DRM_FORMAT_ARGB8888, .hvs = HVS_PIXEL_FORMAT_RGBA8888,
+		.pixel_order = HVS_PIXEL_ORDER_ABGR, .has_alpha = true,
+	},
+};
+
+static const struct hvs_format *vc4_get_hvs_format(u32 drm_format)
+{
+	unsigned i;
+
+	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) {
+		if (hvs_formats[i].drm == drm_format)
+			return &hvs_formats[i];
+	}
+
+	return NULL;
+}
+
+static bool plane_enabled(struct drm_plane_state *state)
+{
+	return state->fb && state->crtc;
+}
+
+struct drm_plane_state *vc4_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct vc4_plane_state *vc4_state;
+
+	if (WARN_ON(!plane->state))
+		return NULL;
+
+	vc4_state = kmemdup(plane->state, sizeof(*vc4_state), GFP_KERNEL);
+	if (!vc4_state)
+		return NULL;
+
+	__drm_atomic_helper_plane_duplicate_state(plane, &vc4_state->base);
+
+	if (vc4_state->dlist) {
+		vc4_state->dlist = kmemdup(vc4_state->dlist,
+					   vc4_state->dlist_count * 4,
+					   GFP_KERNEL);
+		if (!vc4_state->dlist) {
+			kfree(vc4_state);
+			return NULL;
+		}
+		vc4_state->dlist_size = vc4_state->dlist_count;
+	}
+
+	return &vc4_state->base;
+}
+
+void vc4_plane_destroy_state(struct drm_plane *plane,
+			     struct drm_plane_state *state)
+{
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
+
+	kfree(vc4_state->dlist);
+	__drm_atomic_helper_plane_destroy_state(plane, &vc4_state->base);
+	kfree(state);
+}
+
+/* Called during init to allocate the plane's atomic state. */
+void vc4_plane_reset(struct drm_plane *plane)
+{
+	struct vc4_plane_state *vc4_state;
+
+	WARN_ON(plane->state);
+
+	vc4_state = kzalloc(sizeof(*vc4_state), GFP_KERNEL);
+	if (!vc4_state)
+		return;
+
+	plane->state = &vc4_state->base;
+	vc4_state->base.plane = plane;
+}
+
+static void vc4_dlist_write(struct vc4_plane_state *vc4_state, u32 val)
+{
+	if (vc4_state->dlist_count == vc4_state->dlist_size) {
+		u32 new_size = max(4u, vc4_state->dlist_count * 2);
+		u32 *new_dlist = kmalloc(new_size * 4, GFP_KERNEL);
+
+		if (!new_dlist)
+			return;
+		memcpy(new_dlist, vc4_state->dlist, vc4_state->dlist_count * 4);
+
+		kfree(vc4_state->dlist);
+		vc4_state->dlist = new_dlist;
+		vc4_state->dlist_size = new_size;
+	}
+
+	vc4_state->dlist[vc4_state->dlist_count++] = val;
+}
+
+/* Writes out a full display list for an active plane to the plane's
+ * private dlist state.
+ */
+static int vc4_plane_mode_set(struct drm_plane *plane,
+			      struct drm_plane_state *state)
+{
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
+	struct drm_framebuffer *fb = state->fb;
+	struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
+	u32 ctl0_offset = vc4_state->dlist_count;
+	const struct hvs_format *format = vc4_get_hvs_format(fb->pixel_format);
+	uint32_t offset = fb->offsets[0];
+	int crtc_x = state->crtc_x;
+	int crtc_y = state->crtc_y;
+	int crtc_w = state->crtc_w;
+	int crtc_h = state->crtc_h;
+
+	if (crtc_x < 0) {
+		offset += drm_format_plane_cpp(fb->pixel_format, 0) * -crtc_x;
+		crtc_w += crtc_x;
+		crtc_x = 0;
+	}
+
+	if (crtc_y < 0) {
+		offset += fb->pitches[0] * -crtc_y;
+		crtc_h += crtc_y;
+		crtc_y = 0;
+	}
+
+	vc4_dlist_write(vc4_state,
+			SCALER_CTL0_VALID |
+			(format->pixel_order << SCALER_CTL0_ORDER_SHIFT) |
+			(format->hvs << SCALER_CTL0_PIXEL_FORMAT_SHIFT) |
+			SCALER_CTL0_UNITY);
+
+	/* Position Word 0: Image Positions and Alpha Value */
+	vc4_dlist_write(vc4_state,
+			VC4_SET_FIELD(0xff, SCALER_POS0_FIXED_ALPHA) |
+			VC4_SET_FIELD(crtc_x, SCALER_POS0_START_X) |
+			VC4_SET_FIELD(crtc_y, SCALER_POS0_START_Y));
+
+	/* Position Word 1: Scaled Image Dimensions.
+	 * Skipped due to SCALER_CTL0_UNITY scaling.
+	 */
+
+	/* Position Word 2: Source Image Size, Alpha Mode */
+	vc4_dlist_write(vc4_state,
+			VC4_SET_FIELD(format->has_alpha ?
+				      SCALER_POS2_ALPHA_MODE_PIPELINE :
+				      SCALER_POS2_ALPHA_MODE_FIXED,
+				      SCALER_POS2_ALPHA_MODE) |
+			VC4_SET_FIELD(crtc_w, SCALER_POS2_WIDTH) |
+			VC4_SET_FIELD(crtc_h, SCALER_POS2_HEIGHT));
+
+	/* Position Word 3: Context.  Written by the HVS. */
+	vc4_dlist_write(vc4_state, 0xc0c0c0c0);
+
+	/* Pointer Word 0: RGB / Y Pointer */
+	vc4_dlist_write(vc4_state, bo->paddr + offset);
+
+	/* Pointer Context Word 0: Written by the HVS */
+	vc4_dlist_write(vc4_state, 0xc0c0c0c0);
+
+	/* Pitch word 0: Pointer 0 Pitch */
+	vc4_dlist_write(vc4_state,
+			VC4_SET_FIELD(fb->pitches[0], SCALER_SRC_PITCH));
+
+	vc4_state->dlist[ctl0_offset] |=
+		VC4_SET_FIELD(vc4_state->dlist_count, SCALER_CTL0_SIZE);
+
+	return 0;
+}
+
+/* If a modeset involves changing the setup of a plane, the atomic
+ * infrastructure will call this to validate a proposed plane setup.
+ * However, if a plane isn't getting updated, this (and the
+ * corresponding vc4_plane_atomic_update) won't get called.  Thus, we
+ * compute the dlist here and have all active plane dlists get updated
+ * in the CRTC's flush.
+ */
+static int vc4_plane_atomic_check(struct drm_plane *plane,
+				  struct drm_plane_state *state)
+{
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
+
+	vc4_state->dlist_count = 0;
+
+	if (plane_enabled(state))
+		return vc4_plane_mode_set(plane, state);
+	else
+		return 0;
+}
+
+static void vc4_plane_atomic_update(struct drm_plane *plane,
+				    struct drm_plane_state *old_state)
+{
+	/* No contents here.  Since we don't know where in the CRTC's
+	 * dlist we should be stored, our dlist is uploaded to the
+	 * hardware with vc4_plane_write_dlist() at CRTC atomic_flush
+	 * time.
+	 */
+}
+
+u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist)
+{
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state);
+	int i;
+
+	/* Can't memcpy_toio() because it needs to be 32-bit writes. */
+	for (i = 0; i < vc4_state->dlist_count; i++)
+		writel(vc4_state->dlist[i], &dlist[i]);
+
+	return vc4_state->dlist_count;
+}
+
+u32 vc4_plane_dlist_size(struct drm_plane_state *state)
+{
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
+
+	return vc4_state->dlist_count;
+}
+
+static const struct drm_plane_helper_funcs vc4_plane_helper_funcs = {
+	.prepare_fb = NULL,
+	.cleanup_fb = NULL,
+	.atomic_check = vc4_plane_atomic_check,
+	.atomic_update = vc4_plane_atomic_update,
+};
+
+static void vc4_plane_destroy(struct drm_plane *plane)
+{
+	drm_plane_helper_disable(plane);
+	drm_plane_cleanup(plane);
+}
+
+static const struct drm_plane_funcs vc4_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = vc4_plane_destroy,
+	.set_property = NULL,
+	.reset = vc4_plane_reset,
+	.atomic_duplicate_state = vc4_plane_duplicate_state,
+	.atomic_destroy_state = vc4_plane_destroy_state,
+};
+
+struct drm_plane *vc4_plane_init(struct drm_device *dev,
+				 enum drm_plane_type type)
+{
+	struct drm_plane *plane = NULL;
+	struct vc4_plane *vc4_plane;
+	u32 formats[ARRAY_SIZE(hvs_formats)];
+	int ret = 0;
+	unsigned i;
+
+	vc4_plane = devm_kzalloc(dev->dev, sizeof(*vc4_plane),
+				 GFP_KERNEL);
+	if (!vc4_plane) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++)
+		formats[i] = hvs_formats[i].drm;
+	plane = &vc4_plane->base;
+	ret = drm_universal_plane_init(dev, plane, 0xff,
+				       &vc4_plane_funcs,
+				       formats, ARRAY_SIZE(formats),
+				       type);
+
+	drm_plane_helper_add(plane, &vc4_plane_helper_funcs);
+
+	return plane;
+fail:
+	if (plane)
+		vc4_plane_destroy(plane);
+
+	return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
new file mode 100644
index 0000000..0eff631
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_regs.h
@@ -0,0 +1,562 @@
+/*
+ *  Copyright ? 2014-2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define VC4_MASK(high, low) (((1 << ((high) - (low) + 1)) - 1) << (low))
+/* Using the GNU statement expression extension */
+#define VC4_SET_FIELD(value, field)					\
+	({								\
+		uint32_t fieldval = (value) << field##_SHIFT;		\
+		WARN_ON((fieldval & ~field##_MASK) != 0);		\
+		fieldval & field##_MASK;				\
+	 })
+
+#define VC4_GET_FIELD(word, field) (((word) & field##_MASK) >>		\
+				    field##_SHIFT)
+
+#define V3D_IDENT0   0x00000
+# define V3D_EXPECTED_IDENT0 \
+	((2 << 24) | \
+	('V' << 0) | \
+	('3' << 8) | \
+	 ('D' << 16))
+
+#define V3D_IDENT1   0x00004
+/* Multiples of 1kb */
+# define V3D_IDENT1_VPM_SIZE_MASK                      VC4_MASK(31, 28)
+# define V3D_IDENT1_VPM_SIZE_SHIFT                     28
+# define V3D_IDENT1_NSEM_MASK                          VC4_MASK(23, 16)
+# define V3D_IDENT1_NSEM_SHIFT                         16
+# define V3D_IDENT1_TUPS_MASK                          VC4_MASK(15, 12)
+# define V3D_IDENT1_TUPS_SHIFT                         12
+# define V3D_IDENT1_QUPS_MASK                          VC4_MASK(11, 8)
+# define V3D_IDENT1_QUPS_SHIFT                         8
+# define V3D_IDENT1_NSLC_MASK                          VC4_MASK(7, 4)
+# define V3D_IDENT1_NSLC_SHIFT                         4
+# define V3D_IDENT1_REV_MASK                           VC4_MASK(3, 0)
+# define V3D_IDENT1_REV_SHIFT                          0
+
+#define V3D_IDENT2   0x00008
+#define V3D_SCRATCH  0x00010
+#define V3D_L2CACTL  0x00020
+# define V3D_L2CACTL_L2CCLR                            (1 << 2)
+# define V3D_L2CACTL_L2CDIS                            (1 << 1)
+# define V3D_L2CACTL_L2CENA                            (1 << 0)
+
+#define V3D_SLCACTL  0x00024
+# define V3D_SLCACTL_T1CC_MASK                         VC4_MASK(27, 24)
+# define V3D_SLCACTL_T1CC_SHIFT                        24
+# define V3D_SLCACTL_T0CC_MASK                         VC4_MASK(19, 16)
+# define V3D_SLCACTL_T0CC_SHIFT                        16
+# define V3D_SLCACTL_UCC_MASK                          VC4_MASK(11, 8)
+# define V3D_SLCACTL_UCC_SHIFT                         8
+# define V3D_SLCACTL_ICC_MASK                          VC4_MASK(3, 0)
+# define V3D_SLCACTL_ICC_SHIFT                         0
+
+#define V3D_INTCTL   0x00030
+#define V3D_INTENA   0x00034
+#define V3D_INTDIS   0x00038
+# define V3D_INT_SPILLUSE                              (1 << 3)
+# define V3D_INT_OUTOMEM                               (1 << 2)
+# define V3D_INT_FLDONE                                (1 << 1)
+# define V3D_INT_FRDONE                                (1 << 0)
+
+#define V3D_CT0CS    0x00100
+#define V3D_CT1CS    0x00104
+#define V3D_CTNCS(n) (V3D_CT0CS + 4 * n)
+# define V3D_CTRSTA      (1 << 15)
+# define V3D_CTSEMA      (1 << 12)
+# define V3D_CTRTSD      (1 << 8)
+# define V3D_CTRUN       (1 << 5)
+# define V3D_CTSUBS      (1 << 4)
+# define V3D_CTERR       (1 << 3)
+# define V3D_CTMODE      (1 << 0)
+
+#define V3D_CT0EA    0x00108
+#define V3D_CT1EA    0x0010c
+#define V3D_CTNEA(n) (V3D_CT0EA + 4 * (n))
+#define V3D_CT0CA    0x00110
+#define V3D_CT1CA    0x00114
+#define V3D_CTNCA(n) (V3D_CT0CA + 4 * (n))
+#define V3D_CT00RA0  0x00118
+#define V3D_CT01RA0  0x0011c
+#define V3D_CTNRA0(n) (V3D_CT00RA0 + 4 * (n))
+#define V3D_CT0LC    0x00120
+#define V3D_CT1LC    0x00124
+#define V3D_CTNLC(n) (V3D_CT0LC + 4 * (n))
+#define V3D_CT0PC    0x00128
+#define V3D_CT1PC    0x0012c
+#define V3D_CTNPC(n) (V3D_CT0PC + 4 * (n))
+
+#define V3D_PCS      0x00130
+# define V3D_BMOOM       (1 << 8)
+# define V3D_RMBUSY      (1 << 3)
+# define V3D_RMACTIVE    (1 << 2)
+# define V3D_BMBUSY      (1 << 1)
+# define V3D_BMACTIVE    (1 << 0)
+
+#define V3D_BFC      0x00134
+#define V3D_RFC      0x00138
+#define V3D_BPCA     0x00300
+#define V3D_BPCS     0x00304
+#define V3D_BPOA     0x00308
+#define V3D_BPOS     0x0030c
+#define V3D_BXCF     0x00310
+#define V3D_SQRSV0   0x00410
+#define V3D_SQRSV1   0x00414
+#define V3D_SQCNTL   0x00418
+#define V3D_SRQPC    0x00430
+#define V3D_SRQUA    0x00434
+#define V3D_SRQUL    0x00438
+#define V3D_SRQCS    0x0043c
+#define V3D_VPACNTL  0x00500
+#define V3D_VPMBASE  0x00504
+#define V3D_PCTRC    0x00670
+#define V3D_PCTRE    0x00674
+#define V3D_PCTR0    0x00680
+#define V3D_PCTRS0   0x00684
+#define V3D_PCTR1    0x00688
+#define V3D_PCTRS1   0x0068c
+#define V3D_PCTR2    0x00690
+#define V3D_PCTRS2   0x00694
+#define V3D_PCTR3    0x00698
+#define V3D_PCTRS3   0x0069c
+#define V3D_PCTR4    0x006a0
+#define V3D_PCTRS4   0x006a4
+#define V3D_PCTR5    0x006a8
+#define V3D_PCTRS5   0x006ac
+#define V3D_PCTR6    0x006b0
+#define V3D_PCTRS6   0x006b4
+#define V3D_PCTR7    0x006b8
+#define V3D_PCTRS7   0x006bc
+#define V3D_PCTR8    0x006c0
+#define V3D_PCTRS8   0x006c4
+#define V3D_PCTR9    0x006c8
+#define V3D_PCTRS9   0x006cc
+#define V3D_PCTR10   0x006d0
+#define V3D_PCTRS10  0x006d4
+#define V3D_PCTR11   0x006d8
+#define V3D_PCTRS11  0x006dc
+#define V3D_PCTR12   0x006e0
+#define V3D_PCTRS12  0x006e4
+#define V3D_PCTR13   0x006e8
+#define V3D_PCTRS13  0x006ec
+#define V3D_PCTR14   0x006f0
+#define V3D_PCTRS14  0x006f4
+#define V3D_PCTR15   0x006f8
+#define V3D_PCTRS15  0x006fc
+#define V3D_BGE      0x00f00
+#define V3D_FDBGO    0x00f04
+#define V3D_FDBGB    0x00f08
+#define V3D_FDBGR    0x00f0c
+#define V3D_FDBGS    0x00f10
+#define V3D_ERRSTAT  0x00f20
+
+#define PV_CONTROL				0x00
+# define PV_CONTROL_FORMAT_MASK			VC4_MASK(23, 21)
+# define PV_CONTROL_FORMAT_SHIFT		21
+# define PV_CONTROL_FORMAT_24			0
+# define PV_CONTROL_FORMAT_DSIV_16		1
+# define PV_CONTROL_FORMAT_DSIC_16		2
+# define PV_CONTROL_FORMAT_DSIV_18		3
+# define PV_CONTROL_FORMAT_DSIV_24		4
+
+# define PV_CONTROL_FIFO_LEVEL_MASK		VC4_MASK(20, 15)
+# define PV_CONTROL_FIFO_LEVEL_SHIFT		15
+# define PV_CONTROL_CLR_AT_START		(1 << 14)
+# define PV_CONTROL_TRIGGER_UNDERFLOW		(1 << 13)
+# define PV_CONTROL_WAIT_HSTART			(1 << 12)
+# define PV_CONTROL_CLK_SELECT_DSI		0
+# define PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI	1
+# define PV_CONTROL_CLK_SELECT_MASK		VC4_MASK(3, 2)
+# define PV_CONTROL_CLK_SELECT_SHIFT		2
+# define PV_CONTROL_FIFO_CLR			(1 << 1)
+# define PV_CONTROL_EN				(1 << 0)
+
+#define PV_V_CONTROL				0x04
+# define PV_VCONTROL_CONTINUOUS			(1 << 1)
+# define PV_VCONTROL_VIDEN			(1 << 0)
+
+#define PV_VSYNCD				0x08
+
+#define PV_HORZA				0x0c
+# define PV_HORZA_HBP_MASK			VC4_MASK(31, 16)
+# define PV_HORZA_HBP_SHIFT			16
+# define PV_HORZA_HSYNC_MASK			VC4_MASK(15, 0)
+# define PV_HORZA_HSYNC_SHIFT			0
+
+#define PV_HORZB				0x10
+# define PV_HORZB_HFP_MASK			VC4_MASK(31, 16)
+# define PV_HORZB_HFP_SHIFT			16
+# define PV_HORZB_HACTIVE_MASK			VC4_MASK(15, 0)
+# define PV_HORZB_HACTIVE_SHIFT			0
+
+#define PV_VERTA				0x14
+# define PV_VERTA_VBP_MASK			VC4_MASK(31, 16)
+# define PV_VERTA_VBP_SHIFT			16
+# define PV_VERTA_VSYNC_MASK			VC4_MASK(15, 0)
+# define PV_VERTA_VSYNC_SHIFT			0
+
+#define PV_VERTB				0x18
+# define PV_VERTB_VFP_MASK			VC4_MASK(31, 16)
+# define PV_VERTB_VFP_SHIFT			16
+# define PV_VERTB_VACTIVE_MASK			VC4_MASK(15, 0)
+# define PV_VERTB_VACTIVE_SHIFT			0
+
+#define PV_VERTA_EVEN				0x1c
+#define PV_VERTB_EVEN				0x20
+
+#define PV_INTEN				0x24
+#define PV_INTSTAT				0x28
+# define PV_INT_VID_IDLE			(1 << 9)
+# define PV_INT_VFP_END				(1 << 8)
+# define PV_INT_VFP_START			(1 << 7)
+# define PV_INT_VACT_START			(1 << 6)
+# define PV_INT_VBP_START			(1 << 5)
+# define PV_INT_VSYNC_START			(1 << 4)
+# define PV_INT_HFP_START			(1 << 3)
+# define PV_INT_HACT_START			(1 << 2)
+# define PV_INT_HBP_START			(1 << 1)
+# define PV_INT_HSYNC_START			(1 << 0)
+
+#define PV_STAT					0x2c
+
+#define PV_HACT_ACT				0x30
+
+#define SCALER_DISPCTRL                         0x00000000
+/* Global register for clock gating the HVS */
+# define SCALER_DISPCTRL_ENABLE			(1 << 31)
+# define SCALER_DISPCTRL_DSP2EISLUR		(1 << 15)
+# define SCALER_DISPCTRL_DSP1EISLUR		(1 << 14)
+/* Enables Display 0 short line and underrun contribution to
+ * SCALER_DISPSTAT_IRQDISP0.  Note that short frame contributions are
+ * always enabled.
+ */
+# define SCALER_DISPCTRL_DSP0EISLUR		(1 << 13)
+# define SCALER_DISPCTRL_DSP2EIEOLN		(1 << 12)
+# define SCALER_DISPCTRL_DSP2EIEOF		(1 << 11)
+# define SCALER_DISPCTRL_DSP1EIEOLN		(1 << 10)
+# define SCALER_DISPCTRL_DSP1EIEOF		(1 << 9)
+/* Enables Display 0 end-of-line-N contribution to
+ * SCALER_DISPSTAT_IRQDISP0
+ */
+# define SCALER_DISPCTRL_DSP0EIEOLN		(1 << 8)
+/* Enables Display 0 EOF contribution to SCALER_DISPSTAT_IRQDISP0 */
+# define SCALER_DISPCTRL_DSP0EIEOF		(1 << 7)
+
+# define SCALER_DISPCTRL_SLVRDEIRQ		(1 << 6)
+# define SCALER_DISPCTRL_SLVWREIRQ		(1 << 5)
+# define SCALER_DISPCTRL_DMAEIRQ		(1 << 4)
+# define SCALER_DISPCTRL_DISP2EIRQ		(1 << 3)
+# define SCALER_DISPCTRL_DISP1EIRQ		(1 << 2)
+/* Enables interrupt generation on the enabled EOF/EOLN/EISLUR
+ * bits and short frames..
+ */
+# define SCALER_DISPCTRL_DISP0EIRQ		(1 << 1)
+/* Enables interrupt generation on scaler profiler interrupt. */
+# define SCALER_DISPCTRL_SCLEIRQ		(1 << 0)
+
+#define SCALER_DISPSTAT                         0x00000004
+# define SCALER_DISPSTAT_COBLOW2		(1 << 29)
+# define SCALER_DISPSTAT_EOLN2			(1 << 28)
+# define SCALER_DISPSTAT_ESFRAME2		(1 << 27)
+# define SCALER_DISPSTAT_ESLINE2		(1 << 26)
+# define SCALER_DISPSTAT_EUFLOW2		(1 << 25)
+# define SCALER_DISPSTAT_EOF2			(1 << 24)
+
+# define SCALER_DISPSTAT_COBLOW1		(1 << 21)
+# define SCALER_DISPSTAT_EOLN1			(1 << 20)
+# define SCALER_DISPSTAT_ESFRAME1		(1 << 19)
+# define SCALER_DISPSTAT_ESLINE1		(1 << 18)
+# define SCALER_DISPSTAT_EUFLOW1		(1 << 17)
+# define SCALER_DISPSTAT_EOF1			(1 << 16)
+
+# define SCALER_DISPSTAT_RESP_MASK		VC4_MASK(15, 14)
+# define SCALER_DISPSTAT_RESP_SHIFT		14
+# define SCALER_DISPSTAT_RESP_OKAY		0
+# define SCALER_DISPSTAT_RESP_EXOKAY		1
+# define SCALER_DISPSTAT_RESP_SLVERR		2
+# define SCALER_DISPSTAT_RESP_DECERR		3
+
+# define SCALER_DISPSTAT_COBLOW0		(1 << 13)
+/* Set when the DISPEOLN line is done compositing. */
+# define SCALER_DISPSTAT_EOLN0			(1 << 12)
+/* Set when VSTART is seen but there are still pixels in the current
+ * output line.
+ */
+# define SCALER_DISPSTAT_ESFRAME0		(1 << 11)
+/* Set when HSTART is seen but there are still pixels in the current
+ * output line.
+ */
+# define SCALER_DISPSTAT_ESLINE0		(1 << 10)
+/* Set when the the downstream tries to read from the display FIFO
+ * while it's empty.
+ */
+# define SCALER_DISPSTAT_EUFLOW0		(1 << 9)
+/* Set when the display mode changes from RUN to EOF */
+# define SCALER_DISPSTAT_EOF0			(1 << 8)
+
+/* Set on AXI invalid DMA ID error. */
+# define SCALER_DISPSTAT_DMA_ERROR		(1 << 7)
+/* Set on AXI slave read decode error */
+# define SCALER_DISPSTAT_IRQSLVRD		(1 << 6)
+/* Set on AXI slave write decode error */
+# define SCALER_DISPSTAT_IRQSLVWR		(1 << 5)
+/* Set when SCALER_DISPSTAT_DMA_ERROR is set, or
+ * SCALER_DISPSTAT_RESP_ERROR is not SCALER_DISPSTAT_RESP_OKAY.
+ */
+# define SCALER_DISPSTAT_IRQDMA			(1 << 4)
+# define SCALER_DISPSTAT_IRQDISP2		(1 << 3)
+# define SCALER_DISPSTAT_IRQDISP1		(1 << 2)
+/* Set when any of the EOF/EOLN/ESFRAME/ESLINE bits are set and their
+ * corresponding interrupt bit is enabled in DISPCTRL.
+ */
+# define SCALER_DISPSTAT_IRQDISP0		(1 << 1)
+/* On read, the profiler interrupt.  On write, clear *all* interrupt bits. */
+# define SCALER_DISPSTAT_IRQSCL			(1 << 0)
+
+#define SCALER_DISPID                           0x00000008
+#define SCALER_DISPECTRL                        0x0000000c
+#define SCALER_DISPPROF                         0x00000010
+#define SCALER_DISPDITHER                       0x00000014
+#define SCALER_DISPEOLN                         0x00000018
+#define SCALER_DISPLIST0                        0x00000020
+#define SCALER_DISPLIST1                        0x00000024
+#define SCALER_DISPLIST2                        0x00000028
+#define SCALER_DISPLSTAT                        0x0000002c
+#define SCALER_DISPLISTX(x)			(SCALER_DISPLIST0 +	\
+						 (x) * (SCALER_DISPLIST1 - \
+							SCALER_DISPLIST0))
+
+#define SCALER_DISPLACT0                        0x00000030
+#define SCALER_DISPLACT1                        0x00000034
+#define SCALER_DISPLACT2                        0x00000038
+#define SCALER_DISPCTRL0                        0x00000040
+# define SCALER_DISPCTRLX_ENABLE		(1 << 31)
+# define SCALER_DISPCTRLX_RESET			(1 << 30)
+# define SCALER_DISPCTRLX_WIDTH_MASK		VC4_MASK(23, 12)
+# define SCALER_DISPCTRLX_WIDTH_SHIFT		12
+# define SCALER_DISPCTRLX_HEIGHT_MASK		VC4_MASK(11, 0)
+# define SCALER_DISPCTRLX_HEIGHT_SHIFT		0
+
+#define SCALER_DISPBKGND0                       0x00000044
+#define SCALER_DISPSTAT0                        0x00000048
+#define SCALER_DISPBASE0                        0x0000004c
+# define SCALER_DISPSTATX_MODE_MASK		VC4_MASK(31, 30)
+# define SCALER_DISPSTATX_MODE_SHIFT		30
+# define SCALER_DISPSTATX_MODE_DISABLED		0
+# define SCALER_DISPSTATX_MODE_INIT		1
+# define SCALER_DISPSTATX_MODE_RUN		2
+# define SCALER_DISPSTATX_MODE_EOF		3
+# define SCALER_DISPSTATX_FULL			(1 << 29)
+# define SCALER_DISPSTATX_EMPTY			(1 << 28)
+#define SCALER_DISPCTRL1                        0x00000050
+#define SCALER_DISPBKGND1                       0x00000054
+#define SCALER_DISPSTAT1                        0x00000058
+#define SCALER_DISPSTATX(x)			(SCALER_DISPSTAT0 +        \
+						 (x) * (SCALER_DISPSTAT1 - \
+							SCALER_DISPSTAT0))
+#define SCALER_DISPBASE1                        0x0000005c
+#define SCALER_DISPCTRL2                        0x00000060
+#define SCALER_DISPCTRLX(x)			(SCALER_DISPCTRL0 +        \
+						 (x) * (SCALER_DISPCTRL1 - \
+							SCALER_DISPCTRL0))
+#define SCALER_DISPBKGND2                       0x00000064
+#define SCALER_DISPSTAT2                        0x00000068
+#define SCALER_DISPBASE2                        0x0000006c
+#define SCALER_DISPALPHA2                       0x00000070
+#define SCALER_GAMADDR                          0x00000078
+#define SCALER_GAMDATA                          0x000000e0
+#define SCALER_DLIST_START                      0x00002000
+#define SCALER_DLIST_SIZE                       0x00004000
+
+#define VC4_HDMI_CORE_REV			0x000
+
+#define VC4_HDMI_SW_RESET_CONTROL		0x004
+# define VC4_HDMI_SW_RESET_FORMAT_DETECT	(1 << 1)
+# define VC4_HDMI_SW_RESET_HDMI			(1 << 0)
+
+#define VC4_HDMI_HOTPLUG_INT			0x008
+
+#define VC4_HDMI_HOTPLUG			0x00c
+# define VC4_HDMI_HOTPLUG_CONNECTED		(1 << 0)
+
+#define VC4_HDMI_RAM_PACKET_CONFIG		0x0a0
+# define VC4_HDMI_RAM_PACKET_ENABLE		(1 << 16)
+
+#define VC4_HDMI_HORZA				0x0c4
+# define VC4_HDMI_HORZA_VPOS			(1 << 14)
+# define VC4_HDMI_HORZA_HPOS			(1 << 13)
+/* Horizontal active pixels (hdisplay). */
+# define VC4_HDMI_HORZA_HAP_MASK		VC4_MASK(12, 0)
+# define VC4_HDMI_HORZA_HAP_SHIFT		0
+
+#define VC4_HDMI_HORZB				0x0c8
+/* Horizontal pack porch (htotal - hsync_end). */
+# define VC4_HDMI_HORZB_HBP_MASK		VC4_MASK(29, 20)
+# define VC4_HDMI_HORZB_HBP_SHIFT		20
+/* Horizontal sync pulse (hsync_end - hsync_start). */
+# define VC4_HDMI_HORZB_HSP_MASK		VC4_MASK(19, 10)
+# define VC4_HDMI_HORZB_HSP_SHIFT		10
+/* Horizontal front porch (hsync_start - hdisplay). */
+# define VC4_HDMI_HORZB_HFP_MASK		VC4_MASK(9, 0)
+# define VC4_HDMI_HORZB_HFP_SHIFT		0
+
+#define VC4_HDMI_FIFO_CTL			0x05c
+# define VC4_HDMI_FIFO_CTL_RECENTER_DONE	(1 << 14)
+# define VC4_HDMI_FIFO_CTL_USE_EMPTY		(1 << 13)
+# define VC4_HDMI_FIFO_CTL_ON_VB		(1 << 7)
+# define VC4_HDMI_FIFO_CTL_RECENTER		(1 << 6)
+# define VC4_HDMI_FIFO_CTL_FIFO_RESET		(1 << 5)
+# define VC4_HDMI_FIFO_CTL_USE_PLL_LOCK		(1 << 4)
+# define VC4_HDMI_FIFO_CTL_INV_CLK_XFR		(1 << 3)
+# define VC4_HDMI_FIFO_CTL_CAPTURE_PTR		(1 << 2)
+# define VC4_HDMI_FIFO_CTL_USE_FULL		(1 << 1)
+# define VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N	(1 << 0)
+# define VC4_HDMI_FIFO_VALID_WRITE_MASK		0xefff
+
+#define VC4_HDMI_SCHEDULER_CONTROL		0x0c0
+# define VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT (1 << 15)
+# define VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS (1 << 5)
+# define VC4_HDMI_SCHEDULER_CONTROL_VERT_ALWAYS_KEEPOUT	(1 << 3)
+# define VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE	(1 << 1)
+# define VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI	(1 << 0)
+
+#define VC4_HDMI_VERTA0				0x0cc
+#define VC4_HDMI_VERTA1				0x0d4
+/* Vertical sync pulse (vsync_end - vsync_start). */
+# define VC4_HDMI_VERTA_VSP_MASK		VC4_MASK(24, 20)
+# define VC4_HDMI_VERTA_VSP_SHIFT		20
+/* Vertical front porch (vsync_start - vdisplay). */
+# define VC4_HDMI_VERTA_VFP_MASK		VC4_MASK(19, 13)
+# define VC4_HDMI_VERTA_VFP_SHIFT		13
+/* Vertical active lines (vdisplay). */
+# define VC4_HDMI_VERTA_VAL_MASK		VC4_MASK(12, 0)
+# define VC4_HDMI_VERTA_VAL_SHIFT		0
+
+#define VC4_HDMI_VERTB0				0x0d0
+#define VC4_HDMI_VERTB1				0x0d8
+/* Vertical sync pulse offset (for interlaced) */
+# define VC4_HDMI_VERTB_VSPO_MASK		VC4_MASK(21, 9)
+# define VC4_HDMI_VERTB_VSPO_SHIFT		9
+/* Vertical pack porch (vtotal - vsync_end). */
+# define VC4_HDMI_VERTB_VBP_MASK		VC4_MASK(8, 0)
+# define VC4_HDMI_VERTB_VBP_SHIFT		0
+
+#define VC4_HDMI_TX_PHY_RESET_CTL		0x2c0
+
+#define VC4_HD_M_CTL				0x00c
+# define VC4_HD_M_SW_RST			(1 << 2)
+# define VC4_HD_M_ENABLE			(1 << 0)
+
+#define VC4_HD_MAI_CTL				0x014
+
+#define VC4_HD_VID_CTL				0x038
+# define VC4_HD_VID_CTL_ENABLE			(1 << 31)
+# define VC4_HD_VID_CTL_UNDERFLOW_ENABLE	(1 << 30)
+# define VC4_HD_VID_CTL_FRAME_COUNTER_RESET	(1 << 29)
+# define VC4_HD_VID_CTL_VSYNC_LOW		(1 << 28)
+# define VC4_HD_VID_CTL_HSYNC_LOW		(1 << 27)
+
+#define VC4_HD_CSC_CTL				0x040
+# define VC4_HD_CSC_CTL_ORDER_MASK		VC4_MASK(7, 5)
+# define VC4_HD_CSC_CTL_ORDER_SHIFT		5
+# define VC4_HD_CSC_CTL_ORDER_RGB		0
+# define VC4_HD_CSC_CTL_ORDER_BGR		1
+# define VC4_HD_CSC_CTL_ORDER_BRG		2
+# define VC4_HD_CSC_CTL_ORDER_GRB		3
+# define VC4_HD_CSC_CTL_ORDER_GBR		4
+# define VC4_HD_CSC_CTL_ORDER_RBG		5
+# define VC4_HD_CSC_CTL_PADMSB			(1 << 4)
+# define VC4_HD_CSC_CTL_MODE_MASK		VC4_MASK(3, 2)
+# define VC4_HD_CSC_CTL_MODE_SHIFT		2
+# define VC4_HD_CSC_CTL_MODE_RGB_TO_SD_YPRPB	0
+# define VC4_HD_CSC_CTL_MODE_RGB_TO_HD_YPRPB	1
+# define VC4_HD_CSC_CTL_MODE_CUSTOM		2
+# define VC4_HD_CSC_CTL_RGB2YCC			(1 << 1)
+# define VC4_HD_CSC_CTL_ENABLE			(1 << 0)
+
+#define VC4_HD_FRAME_COUNT			0x068
+
+/* HVS display list information. */
+#define HVS_BOOTLOADER_DLIST_END                32
+
+enum hvs_pixel_format {
+	/* 8bpp */
+	HVS_PIXEL_FORMAT_RGB332 = 0,
+	/* 16bpp */
+	HVS_PIXEL_FORMAT_RGBA4444 = 1,
+	HVS_PIXEL_FORMAT_RGB555 = 2,
+	HVS_PIXEL_FORMAT_RGBA5551 = 3,
+	HVS_PIXEL_FORMAT_RGB565 = 4,
+	/* 24bpp */
+	HVS_PIXEL_FORMAT_RGB888 = 5,
+	HVS_PIXEL_FORMAT_RGBA6666 = 6,
+	/* 32bpp */
+	HVS_PIXEL_FORMAT_RGBA8888 = 7
+};
+
+/* Note: the LSB is the rightmost character shown.  Only valid for
+ * HVS_PIXEL_FORMAT_RGB8888, not RGB888.
+ */
+#define HVS_PIXEL_ORDER_RGBA			0
+#define HVS_PIXEL_ORDER_BGRA			1
+#define HVS_PIXEL_ORDER_ARGB			2
+#define HVS_PIXEL_ORDER_ABGR			3
+
+#define HVS_PIXEL_ORDER_XBRG			0
+#define HVS_PIXEL_ORDER_XRBG			1
+#define HVS_PIXEL_ORDER_XRGB			2
+#define HVS_PIXEL_ORDER_XBGR			3
+
+#define HVS_PIXEL_ORDER_XYCBCR			0
+#define HVS_PIXEL_ORDER_XYCRCB			1
+#define HVS_PIXEL_ORDER_YXCBCR			2
+#define HVS_PIXEL_ORDER_YXCRCB			3
+
+#define SCALER_CTL0_END				(1 << 31)
+#define SCALER_CTL0_VALID			(1 << 30)
+
+#define SCALER_CTL0_SIZE_MASK			VC4_MASK(29, 24)
+#define SCALER_CTL0_SIZE_SHIFT			24
+
+#define SCALER_CTL0_HFLIP                       (1 << 16)
+#define SCALER_CTL0_VFLIP                       (1 << 15)
+
+#define SCALER_CTL0_ORDER_MASK			VC4_MASK(14, 13)
+#define SCALER_CTL0_ORDER_SHIFT			13
+
+/* Set to indicate no scaling. */
+#define SCALER_CTL0_UNITY			(1 << 4)
+
+#define SCALER_CTL0_PIXEL_FORMAT_MASK		VC4_MASK(3, 0)
+#define SCALER_CTL0_PIXEL_FORMAT_SHIFT		0
+
+#define SCALER_POS0_FIXED_ALPHA_MASK		VC4_MASK(31, 24)
+#define SCALER_POS0_FIXED_ALPHA_SHIFT		24
+
+#define SCALER_POS0_START_Y_MASK		VC4_MASK(23, 12)
+#define SCALER_POS0_START_Y_SHIFT		12
+
+#define SCALER_POS0_START_X_MASK		VC4_MASK(11, 0)
+#define SCALER_POS0_START_X_SHIFT		0
+
+#define SCALER_POS2_ALPHA_MODE_MASK		VC4_MASK(31, 30)
+#define SCALER_POS2_ALPHA_MODE_SHIFT		30
+#define SCALER_POS2_ALPHA_MODE_PIPELINE		0
+#define SCALER_POS2_ALPHA_MODE_FIXED		1
+#define SCALER_POS2_ALPHA_MODE_FIXED_NONZERO	2
+#define SCALER_POS2_ALPHA_MODE_FIXED_OVER_0x07	3
+
+#define SCALER_POS2_HEIGHT_MASK			VC4_MASK(27, 16)
+#define SCALER_POS2_HEIGHT_SHIFT		16
+
+#define SCALER_POS2_WIDTH_MASK			VC4_MASK(11, 0)
+#define SCALER_POS2_WIDTH_SHIFT			0
+
+#define SCALER_SRC_PITCH_MASK			VC4_MASK(15, 0)
+#define SCALER_SRC_PITCH_SHIFT			0
-- 
2.1.4

[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Daniel Vetter]

On Wed, Aug 12, 2015 at 05:56:16PM -0700, Eric Anholt wrote:
> This is the start of a full VC4 driver.  Right now this just supports
> configuring the display using a pre-existing video mode (because
> changing the pixel clock isn't available yet, and doesn't work when it
> is).  However, this is enough for fbcon and bringing up X using
> xf86-video-modesetting.
> 
> Signed-off-by: Eric Anholt <eric@anholt.net>
> ---
>  drivers/gpu/drm/Kconfig           |   2 +
>  drivers/gpu/drm/Makefile          |   1 +
>  drivers/gpu/drm/vc4/Kconfig       |  14 +
>  drivers/gpu/drm/vc4/Makefile      |  18 ++
>  drivers/gpu/drm/vc4/vc4_bo.c      |  54 ++++
>  drivers/gpu/drm/vc4/vc4_crtc.c    | 583 ++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/vc4/vc4_debugfs.c |  38 +++
>  drivers/gpu/drm/vc4/vc4_drv.c     | 249 +++++++++++++++
>  drivers/gpu/drm/vc4/vc4_drv.h     | 123 +++++++
>  drivers/gpu/drm/vc4/vc4_hdmi.c    | 651 ++++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/vc4/vc4_hvs.c     | 172 ++++++++++
>  drivers/gpu/drm/vc4/vc4_kms.c     |  84 +++++
>  drivers/gpu/drm/vc4/vc4_plane.c   | 320 +++++++++++++++++++
>  drivers/gpu/drm/vc4/vc4_regs.h    | 562 ++++++++++++++++++++++++++++++++
>  14 files changed, 2871 insertions(+)
>  create mode 100644 drivers/gpu/drm/vc4/Kconfig
>  create mode 100644 drivers/gpu/drm/vc4/Makefile
>  create mode 100644 drivers/gpu/drm/vc4/vc4_bo.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_crtc.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_debugfs.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.h
>  create mode 100644 drivers/gpu/drm/vc4/vc4_hdmi.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_hvs.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_kms.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_plane.c
>  create mode 100644 drivers/gpu/drm/vc4/vc4_regs.h

Made a quick pass and found a few things to update to latest drm
developments. Of course didn't look at the hardware details since no clue,
but looks really nice overall.
-Daniel

> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index c46ca31..1730a76 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -240,3 +240,5 @@ source "drivers/gpu/drm/sti/Kconfig"
>  source "drivers/gpu/drm/amd/amdkfd/Kconfig"
>  
>  source "drivers/gpu/drm/imx/Kconfig"
> +
> +source "drivers/gpu/drm/vc4/Kconfig"
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 5713d05..b991ac5 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -42,6 +42,7 @@ obj-$(CONFIG_DRM_MGA)	+= mga/
>  obj-$(CONFIG_DRM_I810)	+= i810/
>  obj-$(CONFIG_DRM_I915)  += i915/
>  obj-$(CONFIG_DRM_MGAG200) += mgag200/
> +obj-$(CONFIG_DRM_VC4)  += vc4/
>  obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus/
>  obj-$(CONFIG_DRM_SIS)   += sis/
>  obj-$(CONFIG_DRM_SAVAGE)+= savage/
> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
> new file mode 100644
> index 0000000..130cc94
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/Kconfig
> @@ -0,0 +1,14 @@
> +config DRM_VC4
> +	tristate "Broadcom VC4 Graphics"
> +	depends on ARCH_BCM2835
> +	depends on DRM
> +	select DRM_KMS_HELPER
> +	select DRM_KMS_FB_HELPER
> +	select DRM_KMS_CMA_HELPER

drm-misc/linux-next already has Archit's patches to enable/disable fbdev
in the core code, so you don't need to bother about these selects here any
more, it'll no-op out if drm fbdev emulation isn't enabled. Since you're
reusing cma fbdev helpers I don't think there's any need for other changes
because of this.

> +	help
> +	  Choose this option if you have a system that has a Broadcom
> +	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
> +
> +	  This driver requires that "avoid_warnings=2" be present in
> +	  the config.txt for the firmware, to keep it from smashing
> +	  our display setup.
> diff --git a/drivers/gpu/drm/vc4/Makefile b/drivers/gpu/drm/vc4/Makefile
> new file mode 100644
> index 0000000..4aa07ca
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/Makefile
> @@ -0,0 +1,18 @@
> +ccflags-y := -Iinclude/drm
> +
> +# Please keep these build lists sorted!
> +
> +# core driver code
> +vc4-y := \
> +	vc4_bo.o \
> +	vc4_crtc.o \
> +	vc4_drv.o \
> +	vc4_kms.o \
> +	vc4_hdmi.o \
> +	vc4_hvs.o \
> +	vc4_plane.o \
> +	$()
> +
> +vc4-$(CONFIG_DEBUG_FS) += vc4_debugfs.o
> +
> +obj-$(CONFIG_DRM_VC4)  += vc4.o
> diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
> new file mode 100644
> index 0000000..fee8cac
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_bo.c
> @@ -0,0 +1,54 @@
> +/*
> + *  Copyright ? 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +/* DOC: VC4 GEM BO management support.
> + *
> + * The VC4 GPU architecture (both scanout and rendering) has direct
> + * access to system memory with no MMU in between.  To support it, we
> + * use the GEM CMA helper functions to allocate contiguous ranges of
> + * physical memory for our BOs.
> + */

Since you're doing kerneldoc considered pulling it all into a new vc4
section in the drm docbook template?

> +
> +#include "vc4_drv.h"
> +
> +struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
> +{
> +	struct drm_gem_cma_object *cma_obj;
> +
> +	cma_obj = drm_gem_cma_create(dev, size);
> +	if (IS_ERR(cma_obj))
> +		return NULL;
> +	else
> +		return to_vc4_bo(&cma_obj->base);
> +}
> +
> +int vc4_dumb_create(struct drm_file *file_priv,
> +		    struct drm_device *dev,
> +		    struct drm_mode_create_dumb *args)
> +{
> +	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
> +	struct vc4_bo *bo = NULL;
> +	int ret;
> +
> +	if (args->pitch < min_pitch)
> +		args->pitch = min_pitch;
> +
> +	if (args->size < args->pitch * args->height)
> +		args->size = args->pitch * args->height;
> +
> +	mutex_lock(&dev->struct_mutex);
> +	bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
> +	mutex_unlock(&dev->struct_mutex);

I'm on a struct_mutex crusade (trying to get rid of it in core and allow
drivers to live without it). On a quick look there doesn't seem to be
anything that needs struct_mutex here, so please just remove it. If there
is indeed something vc4-internal you want to protect, please use your own
driver-internal mutex (e.g. for drm_mm or command submission or whatever).

btw the last bit in the drm core for modern drivers that needs
struct_mutex is mmap_offset gem object lookup. I plan to replace that with
kref_get_unless_zero trickery, which would make the core and a lot of
drivers struct_mutex free and so relegate it mostly to a legacy role (and
can be forgotten).

> +	if (!bo)
> +		return -ENOMEM;
> +
> +	ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
> +	drm_gem_object_unreference_unlocked(&bo->base.base);
> +
> +	return ret;
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> new file mode 100644
> index 0000000..6f127f0
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -0,0 +1,583 @@
> +/*
> + * Copyright (C) 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +/**
> + * DOC: VC4 CRTC module
> + *
> + * In VC4, the Pixel Valve is what most closely corresponds to the
> + * DRM's concept of a CRTC.  The PV generates video timings from the
> + * pixel clock and its configuration.
> + *
> + * However, the DRM CRTC also collects the configuration of all the
> + * DRM planes attached to it.  As a result, this file also manages
> + * setup of the VC4 HVS's display elements on the CRTC.
> + */
> +
> +#include "drm_atomic_helper.h"
> +#include "drm_crtc_helper.h"
> +#include "linux/clk.h"
> +#include "linux/component.h"
> +#include "vc4_drv.h"
> +#include "vc4_regs.h"
> +
> +#define CRTC_WRITE(offset, val) writel(val, vc4_crtc->regs + (offset))
> +#define CRTC_READ(offset) readl(vc4_crtc->regs + (offset))
> +
> +#define CRTC_REG(reg) { reg, #reg }
> +static const struct {
> +	u32 reg;
> +	const char *name;
> +} crtc_regs[] = {
> +	CRTC_REG(PV_CONTROL),
> +	CRTC_REG(PV_V_CONTROL),
> +	CRTC_REG(PV_VSYNCD),
> +	CRTC_REG(PV_HORZA),
> +	CRTC_REG(PV_HORZB),
> +	CRTC_REG(PV_VERTA),
> +	CRTC_REG(PV_VERTB),
> +	CRTC_REG(PV_VERTA_EVEN),
> +	CRTC_REG(PV_VERTB_EVEN),
> +	CRTC_REG(PV_INTEN),
> +	CRTC_REG(PV_INTSTAT),
> +	CRTC_REG(PV_STAT),
> +	CRTC_REG(PV_HACT_ACT),
> +};
> +
> +static void vc4_crtc_dump_regs(struct vc4_crtc *vc4_crtc)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(crtc_regs); i++) {
> +		DRM_INFO("0x%04x (%s): 0x%08x\n",
> +			 crtc_regs[i].reg, crtc_regs[i].name,
> +			 CRTC_READ(crtc_regs[i].reg));
> +	}
> +}
> +
> +#ifdef CONFIG_DEBUG_FS
> +int vc4_crtc_debugfs_regs(struct seq_file *m, void *unused)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *) m->private;
> +	struct drm_device *dev = node->minor->dev;
> +	int crtc_index = (uintptr_t)node->info_ent->data;
> +	struct drm_crtc *crtc;
> +	struct vc4_crtc *vc4_crtc;
> +	int i;
> +
> +	i = 0;
> +	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
> +		if (i == crtc_index)
> +			break;
> +		i++;
> +	}
> +	if (!crtc)
> +		return 0;
> +	vc4_crtc = to_vc4_crtc(crtc);
> +
> +	for (i = 0; i < ARRAY_SIZE(crtc_regs); i++) {
> +		seq_printf(m, "%s (0x%04x): 0x%08x\n",
> +			   crtc_regs[i].name, crtc_regs[i].reg,
> +			   CRTC_READ(crtc_regs[i].reg));
> +	}
> +
> +	return 0;
> +}
> +#endif
> +
> +static void vc4_crtc_destroy(struct drm_crtc *crtc)
> +{
> +	drm_crtc_cleanup(crtc);
> +}
> +
> +static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
> +				const struct drm_display_mode *mode,
> +				struct drm_display_mode *adjusted_mode)
> +{
> +	return true;
> +}

mode_fixup on crtcs is optional since 840bfe953384a and I just merged a
patch to make it optional for encoders too (when using atomic helpers
which you do). You can remove them both.

> +
> +static u32 vc4_get_fifo_full_level(u32 format)
> +{
> +	static const u32 fifo_len_bytes = 64;
> +	static const u32 hvs_latency_pix = 6;
> +
> +	switch (format) {
> +	case PV_CONTROL_FORMAT_DSIV_16:
> +	case PV_CONTROL_FORMAT_DSIC_16:
> +		return fifo_len_bytes - 2 * hvs_latency_pix;
> +	case PV_CONTROL_FORMAT_DSIV_18:
> +		return fifo_len_bytes - 14;
> +	case PV_CONTROL_FORMAT_24:
> +	case PV_CONTROL_FORMAT_DSIV_24:
> +	default:
> +		return fifo_len_bytes - 3 * hvs_latency_pix;
> +	}
> +}
> +
> +static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> +	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +	struct drm_crtc_state *state = crtc->state;
> +	struct drm_display_mode *mode = &state->adjusted_mode;
> +	u32 vactive = (mode->vdisplay >>
> +		       ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0));
> +	u32 format = PV_CONTROL_FORMAT_24;
> +	bool debug_dump_regs = false;
> +
> +	if (debug_dump_regs) {
> +		DRM_INFO("CRTC %d regs before:\n", drm_crtc_index(crtc));
> +		vc4_crtc_dump_regs(vc4_crtc);
> +	}
> +
> +	/* This is where we would set the pixel clock. */
> +
> +	/* Reset the PV fifo. */
> +	CRTC_WRITE(PV_CONTROL, 0);
> +	CRTC_WRITE(PV_CONTROL, PV_CONTROL_FIFO_CLR | PV_CONTROL_EN);
> +	CRTC_WRITE(PV_CONTROL, 0);
> +
> +	CRTC_WRITE(PV_HORZA,
> +		   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
> +				 PV_HORZA_HBP) |
> +		   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
> +				 PV_HORZA_HSYNC));
> +	CRTC_WRITE(PV_HORZB,
> +		   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
> +				 PV_HORZB_HFP) |
> +		   VC4_SET_FIELD(mode->hdisplay, PV_HORZB_HACTIVE));
> +
> +	CRTC_WRITE(PV_VERTA,
> +		   VC4_SET_FIELD(mode->vtotal - mode->vsync_end,
> +				 PV_VERTA_VBP) |
> +		   VC4_SET_FIELD(mode->vsync_end - mode->vsync_start,
> +				 PV_VERTA_VSYNC));
> +	CRTC_WRITE(PV_VERTB,
> +		   VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
> +				 PV_VERTB_VFP) |
> +		   VC4_SET_FIELD(vactive, PV_VERTB_VACTIVE));
> +	if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
> +		/* Write PV_VERTA_EVEN/VERTB_EVEN */
> +	}
> +
> +	CRTC_WRITE(PV_HACT_ACT, mode->hdisplay);
> +
> +	CRTC_WRITE(PV_V_CONTROL,
> +		   PV_VCONTROL_CONTINUOUS);
> +
> +	CRTC_WRITE(PV_CONTROL,
> +		   VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |
> +		   VC4_SET_FIELD(vc4_get_fifo_full_level(format),
> +				 PV_CONTROL_FIFO_LEVEL) |
> +		   PV_CONTROL_CLR_AT_START |
> +		   PV_CONTROL_TRIGGER_UNDERFLOW |
> +		   PV_CONTROL_WAIT_HSTART |
> +		   VC4_SET_FIELD(PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI,
> +				 PV_CONTROL_CLK_SELECT) |
> +		   PV_CONTROL_FIFO_CLR |
> +		   PV_CONTROL_EN);
> +
> +	if (debug_dump_regs) {
> +		DRM_INFO("CRTC %d regs after:\n", drm_crtc_index(crtc));
> +		vc4_crtc_dump_regs(vc4_crtc);
> +	}
> +}
> +
> +static void
> +require_hvs_enabled(struct drm_device *dev)
> +{
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +
> +	WARN_ON_ONCE((HVS_READ(SCALER_DISPCTRL) & SCALER_DISPCTRL_ENABLE) !=
> +		     SCALER_DISPCTRL_ENABLE);
> +}
> +
> +static void vc4_crtc_disable(struct drm_crtc *crtc)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +
> +	require_hvs_enabled(dev);
> +
> +	CRTC_WRITE(PV_V_CONTROL,
> +		   CRTC_READ(PV_V_CONTROL) & ~PV_VCONTROL_VIDEN);
> +	while (CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_VIDEN)
> +		cpu_relax();
> +
> +	/* Without a wait here, we end up with a black screen. */
> +	msleep(30);
> +
> +	if (HVS_READ(SCALER_DISPCTRLX(vc4_crtc->channel)) &
> +	    SCALER_DISPCTRLX_ENABLE) {
> +		HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel),
> +			  SCALER_DISPCTRLX_RESET);
> +
> +		/* While the docs say that reset is self-clearing, it
> +		 * seems it doesn't actually.
> +		 */
> +		HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel), 0);
> +	}
> +
> +	/* Once we leave, the scaler should be disabled and its fifo empty. */
> +
> +	WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(vc4_crtc->channel)) &
> +		     SCALER_DISPCTRLX_RESET);
> +
> +	WARN_ON_ONCE(VC4_GET_FIELD(HVS_READ(SCALER_DISPSTATX(vc4_crtc->channel)),
> +				   SCALER_DISPSTATX_MODE) !=
> +		     SCALER_DISPSTATX_MODE_DISABLED);
> +
> +	WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(vc4_crtc->channel)) &
> +		      (SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
> +		     SCALER_DISPSTATX_EMPTY);
> +}
> +
> +static void vc4_crtc_enable(struct drm_crtc *crtc)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +	struct drm_crtc_state *state = crtc->state;
> +	struct drm_display_mode *mode = &state->adjusted_mode;
> +
> +	require_hvs_enabled(dev);
> +
> +	/* Turn on the scaler, which will wait for vstart to start
> +	 * compositing.
> +	 */
> +	HVS_WRITE(SCALER_DISPCTRLX(vc4_crtc->channel),
> +		  VC4_SET_FIELD(mode->hdisplay, SCALER_DISPCTRLX_WIDTH) |
> +		  VC4_SET_FIELD(mode->vdisplay, SCALER_DISPCTRLX_HEIGHT) |
> +		  SCALER_DISPCTRLX_ENABLE);
> +
> +	/* Turn on the pixel valve, which will emit the vstart signal. */
> +	CRTC_WRITE(PV_V_CONTROL,
> +		   CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
> +}
> +
> +static int vc4_crtc_atomic_check(struct drm_crtc *crtc,
> +				 struct drm_crtc_state *state)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct drm_plane *plane;
> +	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +	u32 dlist_count = 0;
> +
> +	drm_atomic_crtc_state_for_each_plane(plane, state) {
> +		struct drm_plane_state *plane_state =
> +			state->state->plane_states[drm_plane_index(plane)];
> +
> +		/* plane might not have changed, in which case take
> +		 * current state:
> +		 */
> +		if (!plane_state)
> +			plane_state = plane->state;
> +
> +		dlist_count += vc4_plane_dlist_size(plane_state);
> +	}
> +
> +	dlist_count++; /* Account for SCALER_CTL0_END. */
> +
> +	if (!vc4_crtc->dlist || dlist_count > vc4_crtc->dlist_size) {
> +		vc4_crtc->dlist = ((u32 __iomem *)vc4->hvs->dlist +
> +				   HVS_BOOTLOADER_DLIST_END);
> +		vc4_crtc->dlist_size = ((SCALER_DLIST_SIZE >> 2) -
> +					HVS_BOOTLOADER_DLIST_END);
> +
> +		if (dlist_count > vc4_crtc->dlist_size) {
> +			DRM_DEBUG_KMS("dlist too large for CRTC (%d > %d).\n",
> +				      dlist_count, vc4_crtc->dlist_size);
> +			return -EINVAL;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void vc4_crtc_atomic_begin(struct drm_crtc *crtc)
> +{
> +}
> +
> +static void vc4_crtc_atomic_flush(struct drm_crtc *crtc)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +	struct drm_plane *plane;
> +	bool debug_dump_regs = false;
> +	u32 __iomem *dlist_next = vc4_crtc->dlist;
> +
> +	if (debug_dump_regs) {
> +		DRM_INFO("CRTC %d HVS before:\n", drm_crtc_index(crtc));
> +		vc4_hvs_dump_state(dev);
> +	}
> +
> +	/* Copy all the active planes' dlist contents to the hardware dlist.
> +	 *
> +	 * XXX: If the new display list was large enough that it
> +	 * overlapped a currently-read display list, we need to do
> +	 * something like disable scanout before putting in the new
> +	 * list.  For now, we're safe because we only have the two
> +	 * planes.
> +	 */
> +	drm_atomic_crtc_for_each_plane(plane, crtc) {
> +		dlist_next += vc4_plane_write_dlist(plane, dlist_next);
> +	}
> +
> +	if (dlist_next == vc4_crtc->dlist) {
> +		/* If no planes were enabled, use the SCALER_CTL0_END
> +		 * at the start of the display list memory (in the
> +		 * bootloader section).  We'll rewrite that
> +		 * SCALER_CTL0_END, just in case, though.
> +		 */
> +		writel(SCALER_CTL0_END, vc4->hvs->dlist);
> +		HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel), 0);
> +	} else {
> +		writel(SCALER_CTL0_END, dlist_next);
> +		dlist_next++;
> +
> +		HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
> +			  (u32 *)vc4_crtc->dlist - (u32 *)vc4->hvs->dlist);
> +
> +		/* Make the next display list start after ours. */
> +		vc4_crtc->dlist_size -= (dlist_next - vc4_crtc->dlist);
> +		vc4_crtc->dlist = dlist_next;
> +	}
> +
> +	if (debug_dump_regs) {
> +		DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
> +		vc4_hvs_dump_state(dev);
> +	}
> +
> +	if (crtc->state->event) {
> +		unsigned long flags;
> +
> +		crtc->state->event->pipe = drm_crtc_index(crtc);
> +
> +		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
> +
> +		spin_lock_irqsave(&dev->event_lock, flags);
> +		vc4_crtc->event = crtc->state->event;
> +		spin_unlock_irqrestore(&dev->event_lock, flags);
> +		crtc->state->event = NULL;
> +	}
> +}
> +
> +int vc4_enable_vblank(struct drm_device *dev, int crtc_id)
> +{
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct vc4_crtc *vc4_crtc = vc4->crtc[crtc_id];
> +
> +	CRTC_WRITE(PV_INTEN, PV_INT_VFP_START);
> +
> +	return 0;
> +}
> +
> +void vc4_disable_vblank(struct drm_device *dev, int crtc_id)
> +{
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct vc4_crtc *vc4_crtc = vc4->crtc[crtc_id];
> +
> +	CRTC_WRITE(PV_INTEN, 0);
> +}
> +
> +static void
> +vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
> +{
> +	struct drm_crtc *crtc = &vc4_crtc->base;
> +	struct drm_device *dev = crtc->dev;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&dev->event_lock, flags);
> +	if (vc4_crtc->event) {
> +		drm_crtc_send_vblank_event(crtc, vc4_crtc->event);
> +		vc4_crtc->event = NULL;
> +	}
> +	spin_unlock_irqrestore(&dev->event_lock, flags);
> +}
> +
> +static irqreturn_t vc4_crtc_irq_handler(int irq, void *data)
> +{
> +	struct vc4_crtc *vc4_crtc = data;
> +	u32 stat = CRTC_READ(PV_INTSTAT);
> +	irqreturn_t ret = IRQ_NONE;
> +
> +	if (stat & PV_INT_VFP_START) {
> +		CRTC_WRITE(PV_INTSTAT, PV_INT_VFP_START);
> +		drm_crtc_handle_vblank(&vc4_crtc->base);
> +		vc4_crtc_handle_page_flip(vc4_crtc);
> +		ret = IRQ_HANDLED;
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct drm_crtc_funcs vc4_crtc_funcs = {
> +	.set_config = drm_atomic_helper_set_config,
> +	.destroy = vc4_crtc_destroy,
> +	.page_flip = drm_atomic_helper_page_flip,
> +	.set_property = NULL,
> +	.cursor_set = NULL, /* handled by drm_mode_cursor_universal */
> +	.cursor_move = NULL, /* handled by drm_mode_cursor_universal */
> +	.reset = drm_atomic_helper_crtc_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +};
> +
> +static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
> +	.mode_fixup = vc4_crtc_mode_fixup,
> +	.mode_set_nofb = vc4_crtc_mode_set_nofb,
> +	.disable = vc4_crtc_disable,
> +	.enable = vc4_crtc_enable,
> +	.atomic_check = vc4_crtc_atomic_check,
> +	.atomic_begin = vc4_crtc_atomic_begin,
> +	.atomic_flush = vc4_crtc_atomic_flush,
> +};
> +
> +/* Frees the page flip event when the DRM device is closed with the
> + * event still outstanding.
> + */
> +void vc4_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file)
> +{
> +	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
> +	struct drm_device *dev = crtc->dev;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&dev->event_lock, flags);
> +
> +	if (vc4_crtc->event && vc4_crtc->event->base.file_priv == file) {
> +		vc4_crtc->event->base.destroy(&vc4_crtc->event->base);
> +		drm_crtc_vblank_put(crtc);
> +		vc4_crtc->event = NULL;
> +	}
> +
> +	spin_unlock_irqrestore(&dev->event_lock, flags);
> +}
> +
> +static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct drm_device *drm = dev_get_drvdata(master);
> +	struct vc4_dev *vc4 = to_vc4_dev(drm);
> +	struct vc4_crtc *vc4_crtc;
> +	struct drm_crtc *crtc;
> +	struct drm_plane *primary_plane, *cursor_plane;
> +	int ret;
> +
> +	primary_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_PRIMARY);
> +	if (!primary_plane) {
> +		dev_err(dev, "failed to construct primary plane\n");
> +		ret = PTR_ERR(primary_plane);
> +		goto fail;
> +	}
> +
> +	cursor_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_CURSOR);
> +	if (!cursor_plane) {
> +		dev_err(dev, "failed to construct cursor plane\n");
> +		ret = PTR_ERR(cursor_plane);
> +		goto fail;
> +	}
> +
> +	vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
> +	if (!vc4_crtc)
> +		return -ENOMEM;
> +	crtc = &vc4_crtc->base;
> +
> +	vc4_crtc->regs = vc4_ioremap_regs(pdev, 0);
> +	if (IS_ERR(vc4_crtc->regs))
> +		return PTR_ERR(vc4_crtc->regs);
> +
> +	drm_crtc_init_with_planes(drm, crtc, primary_plane, cursor_plane,
> +				  &vc4_crtc_funcs);
> +	drm_crtc_helper_add(crtc, &vc4_crtc_helper_funcs);
> +	primary_plane->crtc = crtc;
> +	cursor_plane->crtc = crtc;
> +	vc4->crtc[drm_crtc_index(crtc)] = vc4_crtc;
> +
> +	/* Until we have full scanout setup to route things through to
> +	 * encoders, line things up like the firmware did.
> +	 */
> +	switch (drm_crtc_index(crtc)) {
> +	case 0:
> +		vc4_crtc->channel = 0;
> +		break;
> +	case 1:
> +		vc4_crtc->channel = 2;
> +		break;
> +	default:
> +	case 2:
> +		vc4_crtc->channel = 1;
> +		break;
> +	}
> +
> +	CRTC_WRITE(PV_INTEN, 0);
> +	CRTC_WRITE(PV_INTSTAT, PV_INT_VFP_START);
> +	ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
> +			       vc4_crtc_irq_handler, 0, "vc4 crtc", vc4_crtc);
> +
> +	platform_set_drvdata(pdev, vc4_crtc);
> +
> +	return 0;
> +
> +fail:
> +	return ret;
> +}
> +
> +static void vc4_crtc_unbind(struct device *dev, struct device *master,
> +			    void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct vc4_crtc *vc4_crtc = dev_get_drvdata(dev);
> +
> +	vc4_crtc_destroy(&vc4_crtc->base);
> +
> +	CRTC_WRITE(PV_INTEN, 0);
> +
> +	platform_set_drvdata(pdev, NULL);
> +}
> +
> +static const struct component_ops vc4_crtc_ops = {
> +	.bind   = vc4_crtc_bind,
> +	.unbind = vc4_crtc_unbind,
> +};
> +
> +static int vc4_crtc_dev_probe(struct platform_device *pdev)
> +{
> +	return component_add(&pdev->dev, &vc4_crtc_ops);
> +}
> +
> +static int vc4_crtc_dev_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &vc4_crtc_ops);
> +	return 0;
> +}
> +
> +static const struct of_device_id vc4_crtc_dt_match[] = {
> +	{ .compatible = "brcm,vc4-pixelvalve" },
> +	{}
> +};
> +
> +static struct platform_driver vc4_crtc_driver = {
> +	.probe = vc4_crtc_dev_probe,
> +	.remove = vc4_crtc_dev_remove,
> +	.driver = {
> +		.name = "vc4_crtc",
> +		.of_match_table = vc4_crtc_dt_match,
> +	},
> +};
> +
> +void __init vc4_crtc_register(void)
> +{
> +	platform_driver_register(&vc4_crtc_driver);
> +}
> +
> +void __exit vc4_crtc_unregister(void)
> +{
> +	platform_driver_unregister(&vc4_crtc_driver);
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_debugfs.c b/drivers/gpu/drm/vc4/vc4_debugfs.c
> new file mode 100644
> index 0000000..c557039
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_debugfs.c
> @@ -0,0 +1,38 @@
> +/*
> + *  Copyright ? 2014 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/seq_file.h>
> +#include <linux/circ_buf.h>
> +#include <linux/ctype.h>
> +#include <linux/debugfs.h>
> +#include <drm/drmP.h>
> +
> +#include "vc4_drv.h"
> +#include "vc4_regs.h"
> +
> +static const struct drm_info_list vc4_debugfs_list[] = {
> +	{"hdmi_regs", vc4_hdmi_debugfs_regs, 0},
> +	{"hvs_regs", vc4_hvs_debugfs_regs, 0},
> +	{"crtc0_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)0},
> +	{"crtc1_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)1},
> +	{"crtc2_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)2},
> +};
> +#define VC4_DEBUGFS_ENTRIES ARRAY_SIZE(vc4_debugfs_list)
> +
> +int
> +vc4_debugfs_init(struct drm_minor *minor)
> +{
> +	return drm_debugfs_create_files(vc4_debugfs_list, VC4_DEBUGFS_ENTRIES,
> +					minor->debugfs_root, minor);
> +}
> +
> +void
> +vc4_debugfs_cleanup(struct drm_minor *minor)
> +{
> +	drm_debugfs_remove_files(vc4_debugfs_list, VC4_DEBUGFS_ENTRIES, minor);
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> new file mode 100644
> index 0000000..9ecf4b8b
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -0,0 +1,249 @@
> +/*
> + * Copyright (C) 2014-2015 Broadcom
> + * Copyright (C) 2013 Red Hat
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#include "vc4_drv.h"
> +#include "vc4_regs.h"
> +
> +#define DRIVER_NAME "vc4"
> +#define DRIVER_DESC "Broadcom VC4 graphics"
> +#define DRIVER_DATE "20140616"
> +#define DRIVER_MAJOR 0
> +#define DRIVER_MINOR 0
> +#define DRIVER_PATCHLEVEL 0
> +
> +/* Helper function for mapping the regs on a platform device.
> + *
> + * We assume only one register range per device, so we use index 0.
> + */
> +void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index)
> +{
> +	struct resource *res;
> +	void __iomem *map;
> +
> +	res = platform_get_resource(dev, IORESOURCE_MEM, index);
> +	map = devm_ioremap_resource(&dev->dev, res);
> +	if (IS_ERR(map)) {
> +		DRM_ERROR("Failed to map registers: %ld\n", PTR_ERR(map));
> +		return map;
> +	}
> +
> +	return map;
> +}
> +
> +static int vc4_drm_load(struct drm_device *dev, unsigned long flags)
> +{
> +	struct vc4_dev *vc4;
> +	int ret;
> +
> +	vc4 = devm_kzalloc(dev->dev, sizeof(*vc4), GFP_KERNEL);
> +	if (!vc4)
> +		return -ENOMEM;
> +
> +	dev_set_drvdata(dev->dev, dev);
> +	vc4->dev = dev;
> +	dev->dev_private = vc4;
> +
> +	drm_mode_config_init(dev);
> +
> +	ret = component_bind_all(dev->dev, dev);
> +	if (ret)
> +		return ret;
> +
> +	vc4_kms_load(dev);
> +
> +	return 0;
> +}

->load has backwards init ordering (we register public interfaces before
calling it, yay) because backwards compat. Hence deprecated, please use
drm_dev_alloc(); ... driver init including drm_dev_set_unique();
drm_dev_register(); instead and drop ->load.

> +
> +static int vc4_drm_unload(struct drm_device *dev)
> +{
> +	drm_mode_config_cleanup(dev);
> +
> +	component_unbind_all(dev->dev, dev);
> +
> +	return 0;
> +}
> +
> +static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file)
> +{
> +	struct drm_crtc *crtc;
> +
> +	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
> +		vc4_cancel_page_flip(crtc, file);
> +}
> +
> +static const struct file_operations vc4_drm_fops = {
> +	.owner = THIS_MODULE,
> +	.open = drm_open,
> +	.release = drm_release,
> +	.unlocked_ioctl = drm_ioctl,
> +	.mmap = drm_gem_cma_mmap,
> +	.poll = drm_poll,
> +	.read = drm_read,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl = drm_compat_ioctl,
> +#endif
> +	.llseek = noop_llseek,
> +};
> +
> +static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
> +};
> +
> +static struct drm_driver vc4_drm_driver = {
> +	.driver_features = (DRIVER_MODESET |
> +			    DRIVER_ATOMIC |
> +			    DRIVER_GEM |
> +			    DRIVER_PRIME),
> +	.load = vc4_drm_load,
> +	.unload = vc4_drm_unload,
> +	.set_busid = drm_platform_set_busid,

with ->load dropp and set_unique called directly you can drop this one
too. tegra is a nice example for the new sequence.

> +	.preclose = vc4_drm_preclose,
> +
> +	.enable_vblank = vc4_enable_vblank,
> +	.disable_vblank = vc4_disable_vblank,
> +	.get_vblank_counter = drm_vblank_count,
> +
> +#if defined(CONFIG_DEBUG_FS)
> +	.debugfs_init = vc4_debugfs_init,
> +	.debugfs_cleanup = vc4_debugfs_cleanup,
> +#endif
> +
> +	.gem_free_object = drm_gem_cma_free_object,
> +	.gem_vm_ops = &drm_gem_cma_vm_ops,
> +
> +	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> +	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> +	.gem_prime_import = drm_gem_prime_import,
> +	.gem_prime_export = drm_gem_prime_export,
> +	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
> +	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> +	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
> +	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
> +	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
> +
> +	.dumb_create = vc4_dumb_create,
> +	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
> +	.dumb_destroy = drm_gem_dumb_destroy,
> +
> +	.ioctls = vc4_drm_ioctls,
> +	.num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
> +	.fops = &vc4_drm_fops,
> +
> +	.name = DRIVER_NAME,
> +	.desc = DRIVER_DESC,
> +	.date = DRIVER_DATE,
> +	.major = DRIVER_MAJOR,
> +	.minor = DRIVER_MINOR,
> +	.patchlevel = DRIVER_PATCHLEVEL,
> +};
> +
> +static int vc4_drm_bind(struct device *dev)
> +{
> +	return drm_platform_init(&vc4_drm_driver, to_platform_device(dev));
> +}
> +
> +static void vc4_drm_unbind(struct device *dev)
> +{
> +	drm_put_dev(platform_get_drvdata(to_platform_device(dev)));
> +}
> +
> +static const struct component_master_ops vc4_drm_ops = {
> +	.bind = vc4_drm_bind,
> +	.unbind = vc4_drm_unbind,
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> +	return dev->of_node == data;
> +}
> +
> +static int add_components(struct device *dev, struct component_match **matchptr,
> +			  const char *name)
> +{
> +	struct device_node *np = dev->of_node;
> +	unsigned i;
> +
> +	for (i = 0; ; i++) {
> +		struct device_node *node;
> +
> +		node = of_parse_phandle(np, name, i);
> +		if (!node)
> +			break;
> +
> +		component_match_add(dev, matchptr, compare_of, node);
> +	}
> +
> +	return 0;
> +}
> +
> +static int vc4_platform_drm_probe(struct platform_device *pdev)
> +{
> +	struct component_match *match = NULL;
> +
> +	add_components(&pdev->dev, &match, "crtcs");
> +	add_components(&pdev->dev, &match, "encoders");
> +	add_components(&pdev->dev, &match, "hvss");
> +
> +	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> +	return component_master_add_with_match(&pdev->dev, &vc4_drm_ops, match);
> +}
> +
> +static int vc4_platform_drm_remove(struct platform_device *pdev)
> +{
> +	drm_put_dev(platform_get_drvdata(pdev));
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id vc4_of_match[] = {
> +	{ .compatible = "brcm,vc4", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, vc4_of_match);
> +
> +static struct platform_driver vc4_platform_driver = {
> +	.probe		= vc4_platform_drm_probe,
> +	.remove		= vc4_platform_drm_remove,
> +	.driver		= {
> +		.name	= "vc4-drm",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = vc4_of_match,
> +	},
> +};
> +
> +static int __init vc4_drm_register(void)
> +{
> +	vc4_hdmi_register();
> +	vc4_crtc_register();
> +	vc4_hvs_register();
> +	return platform_driver_register(&vc4_platform_driver);
> +}
> +
> +static void __exit vc4_drm_unregister(void)
> +{
> +	platform_driver_unregister(&vc4_platform_driver);
> +	vc4_hvs_unregister();
> +	vc4_crtc_unregister();
> +	vc4_hdmi_unregister();
> +}
> +
> +module_init(vc4_drm_register);
> +module_exit(vc4_drm_unregister);
> +
> +MODULE_ALIAS("platform:vc4-drm");
> +MODULE_DESCRIPTION("Broadcom VC4 DRM Driver");
> +MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> new file mode 100644
> index 0000000..1b0a0b0
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -0,0 +1,123 @@
> +/*
> + * Copyright (C) 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include "drmP.h"
> +#include "drm_gem_cma_helper.h"
> +
> +struct vc4_dev {
> +	struct drm_device *dev;
> +
> +	struct vc4_hdmi *hdmi;
> +	struct vc4_hvs *hvs;
> +	struct vc4_crtc *crtc[3];
> +};
> +
> +static inline struct vc4_dev *
> +to_vc4_dev(struct drm_device *dev)
> +{
> +	return (struct vc4_dev *)dev->dev_private;
> +}
> +
> +struct vc4_bo {
> +	struct drm_gem_cma_object base;
> +};
> +
> +static inline struct vc4_bo *
> +to_vc4_bo(struct drm_gem_object *bo)
> +{
> +	return (struct vc4_bo *)bo;
> +}
> +
> +struct vc4_hvs {
> +	struct platform_device *pdev;
> +	void __iomem *regs;
> +	void __iomem *dlist;
> +};
> +
> +struct vc4_crtc {
> +	struct drm_crtc base;
> +	void __iomem *regs;
> +
> +	/* Which HVS channel we're using for our CRTC. */
> +	int channel;
> +
> +	/* Pointer to the actual hardware display list memory for the
> +	 * crtc.
> +	 */
> +	u32 __iomem *dlist;
> +
> +	u32 dlist_size; /* in dwords */
> +
> +	struct drm_pending_vblank_event *event;
> +};
> +
> +static inline struct vc4_crtc *
> +to_vc4_crtc(struct drm_crtc *crtc)
> +{
> +	return (struct vc4_crtc *)crtc;
> +}
> +
> +struct vc4_plane {
> +	struct drm_plane base;
> +};
> +
> +static inline struct vc4_plane *
> +to_vc4_plane(struct drm_plane *plane)
> +{
> +	return (struct vc4_plane *)plane;
> +}
> +
> +#define HVS_READ(offset) readl(vc4->hvs->regs + offset)
> +#define HVS_WRITE(offset, val) writel(val, vc4->hvs->regs + offset)
> +
> +/* vc4_bo.c */
> +void vc4_free_object(struct drm_gem_object *gem_obj);
> +struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size);
> +int vc4_dumb_create(struct drm_file *file_priv,
> +		    struct drm_device *dev,
> +		    struct drm_mode_create_dumb *args);
> +struct dma_buf *vc4_prime_export(struct drm_device *dev,
> +				 struct drm_gem_object *obj, int flags);
> +
> +/* vc4_crtc.c */
> +void vc4_crtc_register(void);
> +void vc4_crtc_unregister(void);
> +int vc4_enable_vblank(struct drm_device *dev, int crtc_id);
> +void vc4_disable_vblank(struct drm_device *dev, int crtc_id);
> +void vc4_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
> +int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg);
> +
> +/* vc4_debugfs.c */
> +int vc4_debugfs_init(struct drm_minor *minor);
> +void vc4_debugfs_cleanup(struct drm_minor *minor);
> +
> +/* vc4_drv.c */
> +void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index);
> +
> +/* vc4_hdmi.c */
> +void vc4_hdmi_register(void);
> +void vc4_hdmi_unregister(void);
> +struct drm_encoder *vc4_hdmi_encoder_init(struct drm_device *dev);
> +struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
> +					      struct drm_encoder *encoder);
> +int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused);
> +
> +/* vc4_hvs.c */
> +void vc4_hvs_register(void);
> +void vc4_hvs_unregister(void);
> +void vc4_hvs_dump_state(struct drm_device *dev);
> +int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused);
> +
> +/* vc4_kms.c */
> +int vc4_kms_load(struct drm_device *dev);
> +
> +/* vc4_plane.c */
> +struct drm_plane *vc4_plane_init(struct drm_device *dev,
> +				 enum drm_plane_type type);
> +u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist);
> +u32 vc4_plane_dlist_size(struct drm_plane_state *state);
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> new file mode 100644
> index 0000000..c1ac96e
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -0,0 +1,651 @@
> +/*
> + * Copyright (c) 2014 The Linux Foundation. All rights reserved.
> + * Copyright (C) 2013 Red Hat
> + * Author: Rob Clark <robdclark@gmail.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "drm_atomic_helper.h"
> +#include "drm_crtc_helper.h"
> +#include "drm_edid.h"
> +#include "linux/clk.h"
> +#include "linux/component.h"
> +#include "linux/of_gpio.h"
> +#include "linux/of_platform.h"
> +#include "vc4_drv.h"
> +#include "vc4_regs.h"
> +
> +/* General HDMI hardware state. */
> +struct vc4_hdmi {
> +	struct platform_device *pdev;
> +	struct i2c_adapter *ddc;
> +	void __iomem *hdmicore_regs;
> +	void __iomem *hd_regs;
> +	int hpd_gpio;
> +
> +	/* Probed video mode at boot time, used to filter display
> +	 * modes to only allow equivalent ones (since we can't set the
> +	 * pixel clock yet).
> +	 */
> +	struct drm_display_mode boot_mode;
> +};
> +#define HDMI_READ(offset) readl(vc4->hdmi->hdmicore_regs + offset)
> +#define HDMI_WRITE(offset, val) writel(val, vc4->hdmi->hdmicore_regs + offset)
> +#define HD_READ(offset) readl(vc4->hdmi->hd_regs + offset)
> +#define HD_WRITE(offset, val) writel(val, vc4->hdmi->hd_regs + offset)
> +
> +/* VC4 HDMI encoder KMS struct */
> +struct vc4_hdmi_encoder {
> +	struct drm_encoder base;
> +	bool hdmi_monitor;
> +};
> +static inline struct vc4_hdmi_encoder *
> +to_vc4_hdmi_encoder(struct drm_encoder *encoder)
> +{
> +	return container_of(encoder, struct vc4_hdmi_encoder, base);
> +}
> +
> +/* VC4 HDMI connector KMS struct */
> +struct vc4_hdmi_connector {
> +	struct drm_connector base;
> +
> +	/* Since the connector is attached to just the one encoder,
> +	 * this is the reference to it so we can do the best_encoder()
> +	 * hook.
> +	 */
> +	struct drm_encoder *encoder;
> +};
> +static inline struct vc4_hdmi_connector *
> +to_vc4_hdmi_connector(struct drm_connector *connector)
> +{
> +	return container_of(connector, struct vc4_hdmi_connector, base);
> +}
> +
> +#define HDMI_REG(reg) { reg, #reg }
> +static const struct {
> +	u32 reg;
> +	const char *name;
> +} hdmi_regs[] = {
> +	HDMI_REG(VC4_HDMI_CORE_REV),
> +	HDMI_REG(VC4_HDMI_SW_RESET_CONTROL),
> +	HDMI_REG(VC4_HDMI_HOTPLUG_INT),
> +	HDMI_REG(VC4_HDMI_HOTPLUG),
> +	HDMI_REG(VC4_HDMI_HORZA),
> +	HDMI_REG(VC4_HDMI_HORZB),
> +	HDMI_REG(VC4_HDMI_FIFO_CTL),
> +	HDMI_REG(VC4_HDMI_SCHEDULER_CONTROL),
> +	HDMI_REG(VC4_HDMI_VERTA0),
> +	HDMI_REG(VC4_HDMI_VERTA1),
> +	HDMI_REG(VC4_HDMI_VERTB0),
> +	HDMI_REG(VC4_HDMI_VERTB1),
> +	HDMI_REG(VC4_HDMI_TX_PHY_RESET_CTL),
> +};
> +static const struct {
> +	u32 reg;
> +	const char *name;
> +} hd_regs[] = {
> +	HDMI_REG(VC4_HD_M_CTL),
> +	HDMI_REG(VC4_HD_MAI_CTL),
> +	HDMI_REG(VC4_HD_VID_CTL),
> +	HDMI_REG(VC4_HD_CSC_CTL),
> +	HDMI_REG(VC4_HD_FRAME_COUNT),
> +};
> +
> +#ifdef CONFIG_DEBUG_FS
> +int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *) m->private;
> +	struct drm_device *dev = node->minor->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) {
> +		seq_printf(m, "%s (0x%04x): 0x%08x\n",
> +			   hdmi_regs[i].name, hdmi_regs[i].reg,
> +			   HDMI_READ(hdmi_regs[i].reg));
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(hd_regs); i++) {
> +		seq_printf(m, "%s (0x%04x): 0x%08x\n",
> +			   hd_regs[i].name, hd_regs[i].reg,
> +			   HD_READ(hd_regs[i].reg));
> +	}
> +
> +	return 0;
> +}
> +#endif /* CONFIG_DEBUG_FS */
> +
> +static void vc4_hdmi_dump_regs(struct drm_device *dev)
> +{
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) {
> +		DRM_INFO("0x%04x (%s): 0x%08x\n",
> +			 hdmi_regs[i].reg, hdmi_regs[i].name,
> +			 HDMI_READ(hdmi_regs[i].reg));
> +	}
> +	for (i = 0; i < ARRAY_SIZE(hd_regs); i++) {
> +		DRM_INFO("0x%04x (%s): 0x%08x\n",
> +			 hd_regs[i].reg, hd_regs[i].name,
> +			 HD_READ(hd_regs[i].reg));
> +	}
> +}
> +
> +static enum drm_connector_status
> +vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	struct drm_device *dev = connector->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +
> +	if (vc4->hdmi->hpd_gpio) {
> +		if (gpio_get_value(vc4->hdmi->hpd_gpio))
> +			return connector_status_connected;
> +		else
> +			return connector_status_disconnected;
> +	}
> +
> +	if (HDMI_READ(VC4_HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
> +		return connector_status_connected;
> +	else
> +		return connector_status_disconnected;
> +}
> +
> +static void vc4_hdmi_connector_destroy(struct drm_connector *connector)
> +{
> +	drm_connector_unregister(connector);
> +	drm_connector_cleanup(connector);
> +}
> +
> +static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
> +{
> +	struct vc4_hdmi_connector *vc4_connector =
> +		to_vc4_hdmi_connector(connector);
> +	struct drm_encoder *encoder = vc4_connector->encoder;
> +	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
> +	struct drm_device *dev = connector->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	int ret = 0;
> +	struct edid *edid;
> +
> +	edid = drm_get_edid(connector, vc4->hdmi->ddc);
> +	if (!edid)
> +		return -ENODEV;
> +
> +	vc4_encoder->hdmi_monitor = drm_detect_hdmi_monitor(edid);
> +	drm_mode_connector_update_edid_property(connector, edid);
> +	ret = drm_add_edid_modes(connector, edid);
> +
> +	return ret;
> +}
> +
> +/* Since we can't set the pixel clock yet, filter out all the EDID
> + * modes that don't match what was set up by the firmware.
> + */
> +int vc4_hdmi_mode_valid(struct drm_connector *connector,
> +			struct drm_display_mode *mode)
> +{
> +	struct drm_device *dev = connector->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct drm_display_mode *boot_mode = &vc4->hdmi->boot_mode;
> +
> +	if (mode->hdisplay != boot_mode->hdisplay ||
> +	    mode->hsync_start != boot_mode->hsync_start ||
> +	    mode->hsync_end != boot_mode->hsync_end ||
> +	    mode->htotal != boot_mode->htotal) {
> +		return MODE_ERROR;
> +	}
> +
> +	return MODE_OK;
> +}
> +
> +static struct drm_encoder *
> +vc4_hdmi_connector_best_encoder(struct drm_connector *connector)
> +{
> +	struct vc4_hdmi_connector *hdmi_connector =
> +		to_vc4_hdmi_connector(connector);
> +	return hdmi_connector->encoder;
> +}
> +
> +static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
> +	.dpms = drm_atomic_helper_connector_dpms,
> +	.detect = vc4_hdmi_connector_detect,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = vc4_hdmi_connector_destroy,
> +	.reset = drm_atomic_helper_connector_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = {
> +	.get_modes = vc4_hdmi_connector_get_modes,
> +	.mode_valid = vc4_hdmi_mode_valid,
> +	.best_encoder = vc4_hdmi_connector_best_encoder,
> +};
> +
> +struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
> +					      struct drm_encoder *encoder)
> +{
> +	struct drm_connector *connector = NULL;
> +	struct vc4_hdmi_connector *hdmi_connector;
> +	int ret = 0;
> +
> +	hdmi_connector = devm_kzalloc(dev->dev, sizeof(*hdmi_connector),
> +				      GFP_KERNEL);
> +	if (!hdmi_connector) {
> +		ret = -ENOMEM;
> +		goto fail;
> +	}
> +	connector = &hdmi_connector->base;
> +
> +	hdmi_connector->encoder = encoder;
> +
> +	drm_connector_init(dev, connector, &vc4_hdmi_connector_funcs,
> +			   DRM_MODE_CONNECTOR_HDMIA);
> +	drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs);
> +
> +	connector->polled = (DRM_CONNECTOR_POLL_CONNECT |
> +			     DRM_CONNECTOR_POLL_DISCONNECT);
> +
> +	connector->interlace_allowed = 0;
> +	connector->doublescan_allowed = 0;
> +
> +	drm_connector_register(connector);
> +
> +	drm_mode_connector_attach_encoder(connector, encoder);
> +
> +	return connector;
> +
> + fail:
> +	if (connector)
> +		vc4_hdmi_connector_destroy(connector);
> +
> +	return ERR_PTR(ret);
> +}
> +
> +static void vc4_encoder_destroy(struct drm_encoder *encoder)
> +{
> +	drm_encoder_cleanup(encoder);
> +}
> +
> +static const struct drm_encoder_funcs vc4_hdmi_encoder_funcs = {
> +	.destroy = vc4_encoder_destroy,
> +};
> +
> +static bool vc4_hdmi_encoder_mode_fixup(struct drm_encoder *encoder,
> +					const struct drm_display_mode *mode,
> +					struct drm_display_mode *adjusted_mode)
> +{
> +	return true;
> +}

As mentioned above, you can drop this one here.

> +
> +static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
> +				      struct drm_display_mode *unadjusted_mode,
> +				      struct drm_display_mode *mode)
> +{
> +	struct drm_device *dev = encoder->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	bool debug_dump_regs = false;
> +	bool hsync_pos = !(mode->flags & DRM_MODE_FLAG_NHSYNC);
> +	bool vsync_pos = !(mode->flags & DRM_MODE_FLAG_NVSYNC);
> +	u32 vactive = (mode->vdisplay >>
> +		       ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0));
> +	u32 verta = (VC4_SET_FIELD(mode->vsync_end - mode->vsync_start,
> +				   VC4_HDMI_VERTA_VSP) |
> +		     VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
> +				   VC4_HDMI_VERTA_VFP) |
> +		     VC4_SET_FIELD(vactive, VC4_HDMI_VERTA_VAL));
> +	u32 vertb = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
> +		     VC4_SET_FIELD(mode->vtotal - mode->vsync_end,
> +				   VC4_HDMI_VERTB_VBP));
> +
> +	if (debug_dump_regs) {
> +		DRM_INFO("HDMI regs before:\n");
> +		vc4_hdmi_dump_regs(dev);
> +	}
> +
> +	HD_WRITE(VC4_HD_VID_CTL, 0);
> +
> +	/* XXX: This is where we would set the HDMI state machine
> +	 * clock, if we had an interface for it.
> +	 */
> +
> +	HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
> +		   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
> +		   VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT |
> +		   VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS);
> +
> +	HDMI_WRITE(VC4_HDMI_HORZA,
> +		   (vsync_pos ? VC4_HDMI_HORZA_VPOS : 0) |
> +		   (hsync_pos ? VC4_HDMI_HORZA_HPOS : 0) |
> +		   VC4_SET_FIELD(mode->hdisplay, VC4_HDMI_HORZA_HAP));
> +
> +	HDMI_WRITE(VC4_HDMI_HORZB,
> +		   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
> +				 VC4_HDMI_HORZB_HBP) |
> +		   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
> +				 VC4_HDMI_HORZB_HSP) |
> +		   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
> +				 VC4_HDMI_HORZB_HFP));
> +
> +	HDMI_WRITE(VC4_HDMI_VERTA0, verta);
> +	HDMI_WRITE(VC4_HDMI_VERTA1, verta);
> +
> +	HDMI_WRITE(VC4_HDMI_VERTB0, vertb);
> +	HDMI_WRITE(VC4_HDMI_VERTB1, vertb);
> +
> +	HD_WRITE(VC4_HD_VID_CTL,
> +		 (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
> +		 (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
> +
> +	/* The RGB order applies even when CSC is disabled. */
> +	HD_WRITE(VC4_HD_CSC_CTL, VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
> +					       VC4_HD_CSC_CTL_ORDER));
> +
> +	HDMI_WRITE(VC4_HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
> +
> +	if (debug_dump_regs) {
> +		DRM_INFO("HDMI regs after:\n");
> +		vc4_hdmi_dump_regs(dev);
> +	}
> +}
> +
> +static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
> +{
> +	struct drm_device *dev = encoder->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +
> +	HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
> +	HD_WRITE(VC4_HD_VID_CTL,
> +		 HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
> +}
> +
> +static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
> +{
> +	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
> +	struct drm_device *dev = encoder->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +
> +	HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0);
> +
> +	HD_WRITE(VC4_HD_VID_CTL,
> +		 HD_READ(VC4_HD_VID_CTL) |
> +		 VC4_HD_VID_CTL_ENABLE |
> +		 VC4_HD_VID_CTL_UNDERFLOW_ENABLE |
> +		 VC4_HD_VID_CTL_FRAME_COUNTER_RESET);
> +
> +	if (vc4_encoder->hdmi_monitor) {
> +		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
> +			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
> +			   VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
> +
> +		while (!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
> +			 VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE)) {
> +			cpu_relax();
> +		}
> +	} else {
> +		HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG,
> +			   HDMI_READ(VC4_HDMI_RAM_PACKET_CONFIG) &
> +			   ~(VC4_HDMI_RAM_PACKET_ENABLE));
> +		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
> +			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
> +			   ~VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
> +
> +		while (HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
> +		       VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE) {
> +			cpu_relax();
> +		}
> +	}
> +
> +	if (vc4_encoder->hdmi_monitor) {
> +		u32 drift;
> +
> +		WARN_ON(!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
> +			  VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE));
> +		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
> +			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
> +			   VC4_HDMI_SCHEDULER_CONTROL_VERT_ALWAYS_KEEPOUT);
> +
> +		/* XXX: Set HDMI_RAM_PACKET_CONFIG (1 << 16) and set
> +		 * up the infoframe.
> +		 */
> +
> +		drift = HDMI_READ(VC4_HDMI_FIFO_CTL);
> +		drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK;
> +
> +		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
> +			   drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
> +		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
> +			   drift | VC4_HDMI_FIFO_CTL_RECENTER);
> +		udelay(1000);
> +		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
> +			   drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
> +		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
> +			   drift | VC4_HDMI_FIFO_CTL_RECENTER);
> +
> +		while ((HDMI_READ(VC4_HDMI_FIFO_CTL) &
> +			VC4_HDMI_FIFO_CTL_RECENTER_DONE) == 0) {
> +			cpu_relax();
> +		}
> +	}
> +}
> +
> +static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
> +	.mode_fixup = vc4_hdmi_encoder_mode_fixup,
> +	.mode_set = vc4_hdmi_encoder_mode_set,
> +	.disable = vc4_hdmi_encoder_disable,
> +	.enable = vc4_hdmi_encoder_enable,
> +};
> +
> +static struct drm_crtc *
> +vc4_get_crtc_node(struct platform_device *pdev)
> +{
> +	struct device_node *crtc_node;
> +	struct platform_device *crtc_pdev;
> +
> +	crtc_node = of_parse_phandle(pdev->dev.of_node, "crtc", 0);
> +	if (!crtc_node) {
> +		DRM_ERROR("No CRTC for hdmi in DT\n");
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	crtc_pdev = of_find_device_by_node(crtc_node);
> +	if (!crtc_pdev) {
> +		DRM_ERROR("No CRTC device attached to OF node\n");
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	return platform_get_drvdata(crtc_pdev);
> +}
> +
> +struct drm_encoder *vc4_hdmi_encoder_init(struct drm_device *dev)
> +{
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	struct drm_encoder *encoder = NULL;
> +	struct vc4_hdmi_encoder *vc4_hdmi_encoder;
> +	struct drm_crtc *crtc;
> +	int ret;
> +
> +	vc4_hdmi_encoder = devm_kzalloc(dev->dev, sizeof(*vc4_hdmi_encoder),
> +					GFP_KERNEL);
> +	if (!vc4_hdmi_encoder) {
> +		ret = -ENOMEM;
> +		goto fail;
> +	}
> +	encoder = &vc4_hdmi_encoder->base;
> +
> +	crtc = vc4_get_crtc_node(vc4->hdmi->pdev);
> +	if (IS_ERR(crtc)) {
> +		ret = PTR_ERR(crtc);
> +		goto fail;
> +	}
> +
> +	drm_encoder_init(dev, encoder, &vc4_hdmi_encoder_funcs,
> +			 DRM_MODE_ENCODER_TMDS);
> +	drm_encoder_helper_add(encoder, &vc4_hdmi_encoder_helper_funcs);
> +
> +	encoder->possible_crtcs = drm_crtc_mask(crtc);
> +
> +	return encoder;
> +
> +fail:
> +	if (encoder)
> +		vc4_encoder_destroy(encoder);
> +
> +	return ERR_PTR(ret);
> +}
> +
> +/* Reads out the current HDMI mode progreamming at driver load time.
> + *
> + * This is currently used for later filtering out of the DDC-probed
> + * video modes, since we can't actually change modes due to not having
> + * control of the necessary clocks.  Later on, we may end up reusing
> + * this for skipping modesets at boot time.
> + */
> +static void
> +vc4_hdmi_get_boot_display_mode(struct vc4_dev *vc4)
> +{
> +	struct drm_display_mode *mode = &vc4->hdmi->boot_mode;
> +	u32 horza = HDMI_READ(VC4_HDMI_HORZA);
> +	u32 horzb = HDMI_READ(VC4_HDMI_HORZB);
> +	u32 verta = HDMI_READ(VC4_HDMI_VERTA0);
> +	u32 vertb = HDMI_READ(VC4_HDMI_VERTB0);
> +
> +	memset(mode, 0, sizeof(*mode));
> +
> +	if (!(horza & VC4_HDMI_HORZA_VPOS))
> +		mode->flags |= DRM_MODE_FLAG_NVSYNC;
> +	if (!(horza & VC4_HDMI_HORZA_HPOS))
> +		mode->flags |= DRM_MODE_FLAG_NHSYNC;
> +	mode->hdisplay = VC4_GET_FIELD(horza, VC4_HDMI_HORZA_HAP);
> +	mode->hsync_start = (mode->hdisplay +
> +			     VC4_GET_FIELD(horzb, VC4_HDMI_HORZB_HFP));
> +	mode->hsync_end = (mode->hsync_start +
> +			   VC4_GET_FIELD(horzb, VC4_HDMI_HORZB_HSP));
> +	mode->htotal = (mode->hsync_end +
> +			VC4_GET_FIELD(horzb, VC4_HDMI_HORZB_HBP));
> +
> +	mode->vdisplay = VC4_GET_FIELD(verta, VC4_HDMI_VERTA_VAL);
> +	mode->vsync_start = (mode->vdisplay +
> +			     VC4_GET_FIELD(verta, VC4_HDMI_VERTA_VFP));
> +	mode->vsync_end = (mode->vsync_start +
> +			   VC4_GET_FIELD(verta, VC4_HDMI_VERTA_VSP));
> +	mode->vtotal = (mode->vsync_end +
> +			VC4_GET_FIELD(vertb, VC4_HDMI_VERTB_VBP));
> +}
> +
> +static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct drm_device *drm = dev_get_drvdata(master);
> +	struct vc4_dev *vc4 = drm->dev_private;
> +	struct vc4_hdmi *hdmi;
> +	struct device_node *ddc_node;
> +	u32 value;
> +
> +	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
> +	if (!hdmi)
> +		return -ENOMEM;
> +
> +	hdmi->pdev = pdev;
> +	hdmi->hdmicore_regs = vc4_ioremap_regs(pdev, 0);
> +	if (IS_ERR(hdmi->hdmicore_regs))
> +		return PTR_ERR(hdmi->hdmicore_regs);
> +
> +	hdmi->hd_regs = vc4_ioremap_regs(pdev, 1);
> +	if (IS_ERR(hdmi->hd_regs))
> +		return PTR_ERR(hdmi->hd_regs);
> +
> +	/* DDC i2c driver */
> +	ddc_node = of_parse_phandle(dev->of_node, "ddc", 0);
> +	if (!ddc_node) {
> +		DRM_ERROR("Failed to find ddc node in device tree\n");
> +		return -ENODEV;
> +	}
> +
> +	hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node);
> +	if (!hdmi->ddc) {
> +		DRM_ERROR("Failed to get ddc i2c adapter by node\n");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	/* Only use the GPIO HPD pin if present in the DT, otherwise
> +	 * we'll use the HDMI core's register.
> +	 */
> +	if (of_find_property(dev->of_node, "hpd-gpio", &value)) {
> +		hdmi->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpio", 0);
> +		if (hdmi->hpd_gpio < 0)
> +			return hdmi->hpd_gpio;
> +	}
> +
> +	vc4->hdmi = hdmi;
> +
> +	/* HDMI core must be enabled. */
> +	WARN_ON_ONCE((HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE) == 0);
> +
> +	vc4_hdmi_get_boot_display_mode(vc4);
> +
> +	return 0;
> +}
> +
> +static void vc4_hdmi_unbind(struct device *dev, struct device *master,
> +			    void *data)
> +{
> +	struct drm_device *drm = dev_get_drvdata(master);
> +	struct vc4_dev *vc4 = drm->dev_private;
> +
> +	put_device(&vc4->hdmi->ddc->dev);
> +
> +	vc4->hdmi = NULL;
> +}
> +
> +static const struct component_ops vc4_hdmi_ops = {
> +	.bind   = vc4_hdmi_bind,
> +	.unbind = vc4_hdmi_unbind,
> +};
> +
> +static int vc4_hdmi_dev_probe(struct platform_device *pdev)
> +{
> +	return component_add(&pdev->dev, &vc4_hdmi_ops);
> +}
> +
> +static int vc4_hdmi_dev_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &vc4_hdmi_ops);
> +	return 0;
> +}
> +
> +static const struct of_device_id vc4_hdmi_dt_match[] = {
> +	{ .compatible = "brcm,vc4-hdmi" },
> +	{}
> +};
> +
> +static struct platform_driver vc4_hdmi_driver = {
> +	.probe = vc4_hdmi_dev_probe,
> +	.remove = vc4_hdmi_dev_remove,
> +	.driver = {
> +		.name = "vc4_hdmi",
> +		.of_match_table = vc4_hdmi_dt_match,
> +	},
> +};
> +
> +void __init vc4_hdmi_register(void)
> +{
> +	platform_driver_register(&vc4_hdmi_driver);
> +}
> +
> +void __exit vc4_hdmi_unregister(void)
> +{
> +	platform_driver_unregister(&vc4_hdmi_driver);
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> new file mode 100644
> index 0000000..dcf4f78
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -0,0 +1,172 @@
> +/*
> + * Copyright (C) 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +/**
> + * DOC: VC4 HVS module.
> + *
> + * The HVS is the piece of hardware that does translation, scaling,
> + * colorspace conversion, and compositing of pixels stored in
> + * framebuffers into a FIFO of pixels going out to the Pixel Valve
> + * (CRTC).
> + *
> + * There is a single global HVS, with multiple output FIFOs that can
> + * be consumed by the PVs.  This file just manages the resources for
> + * the HVS, while the vc4_crtc.c code actually drives HVS setup for
> + * each CRTC.
> + */
> +
> +#include "linux/component.h"
> +#include "vc4_drv.h"
> +#include "vc4_regs.h"
> +
> +#define HVS_REG(reg) { reg, #reg }
> +static const struct {
> +	u32 reg;
> +	const char *name;
> +} hvs_regs[] = {
> +	HVS_REG(SCALER_DISPCTRL),
> +	HVS_REG(SCALER_DISPSTAT),
> +	HVS_REG(SCALER_DISPID),
> +	HVS_REG(SCALER_DISPECTRL),
> +	HVS_REG(SCALER_DISPPROF),
> +	HVS_REG(SCALER_DISPDITHER),
> +	HVS_REG(SCALER_DISPEOLN),
> +	HVS_REG(SCALER_DISPLIST0),
> +	HVS_REG(SCALER_DISPLIST1),
> +	HVS_REG(SCALER_DISPLIST2),
> +	HVS_REG(SCALER_DISPLSTAT),
> +	HVS_REG(SCALER_DISPLACT0),
> +	HVS_REG(SCALER_DISPLACT1),
> +	HVS_REG(SCALER_DISPLACT2),
> +	HVS_REG(SCALER_DISPCTRL0),
> +	HVS_REG(SCALER_DISPBKGND0),
> +	HVS_REG(SCALER_DISPSTAT0),
> +	HVS_REG(SCALER_DISPBASE0),
> +	HVS_REG(SCALER_DISPCTRL1),
> +	HVS_REG(SCALER_DISPBKGND1),
> +	HVS_REG(SCALER_DISPSTAT1),
> +	HVS_REG(SCALER_DISPBASE1),
> +	HVS_REG(SCALER_DISPCTRL2),
> +	HVS_REG(SCALER_DISPBKGND2),
> +	HVS_REG(SCALER_DISPSTAT2),
> +	HVS_REG(SCALER_DISPBASE2),
> +	HVS_REG(SCALER_DISPALPHA2),
> +};
> +
> +void
> +vc4_hvs_dump_state(struct drm_device *dev)
> +{
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
> +		DRM_INFO("0x%04x (%s): 0x%08x\n",
> +			 hvs_regs[i].reg, hvs_regs[i].name,
> +			 HVS_READ(hvs_regs[i].reg));
> +	}
> +
> +	DRM_INFO("HVS ctx:\n");
> +	for (i = 0; i < 64; i += 4) {
> +		DRM_INFO("0x%08x (%s): 0x%08x 0x%08x 0x%08x 0x%08x\n",
> +			 i * 4, i < HVS_BOOTLOADER_DLIST_END ? "B" : "D",
> +			 ((uint32_t *)vc4->hvs->dlist)[i + 0],
> +			 ((uint32_t *)vc4->hvs->dlist)[i + 1],
> +			 ((uint32_t *)vc4->hvs->dlist)[i + 2],
> +			 ((uint32_t *)vc4->hvs->dlist)[i + 3]);
> +	}
> +}
> +
> +#ifdef CONFIG_DEBUG_FS
> +int vc4_hvs_debugfs_regs(struct seq_file *m, void *unused)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *) m->private;
> +	struct drm_device *dev = node->minor->dev;
> +	struct vc4_dev *vc4 = to_vc4_dev(dev);
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(hvs_regs); i++) {
> +		seq_printf(m, "%s (0x%04x): 0x%08x\n",
> +			   hvs_regs[i].name, hvs_regs[i].reg,
> +			   HVS_READ(hvs_regs[i].reg));
> +	}
> +
> +	return 0;
> +}
> +#endif
> +
> +static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct drm_device *drm = dev_get_drvdata(master);
> +	struct vc4_dev *vc4 = drm->dev_private;
> +	struct vc4_hvs *hvs = NULL;
> +
> +	hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
> +	if (!hvs)
> +		return -ENOMEM;
> +
> +	hvs->pdev = pdev;
> +
> +	hvs->regs = vc4_ioremap_regs(pdev, 0);
> +	if (IS_ERR(hvs->regs))
> +		return PTR_ERR(hvs->regs);
> +
> +	hvs->dlist = hvs->regs + SCALER_DLIST_START;
> +
> +	vc4->hvs = hvs;
> +	return 0;
> +}
> +
> +static void vc4_hvs_unbind(struct device *dev, struct device *master,
> +			   void *data)
> +{
> +	struct drm_device *drm = dev_get_drvdata(master);
> +	struct vc4_dev *vc4 = drm->dev_private;
> +
> +	vc4->hvs = NULL;
> +}
> +
> +static const struct component_ops vc4_hvs_ops = {
> +	.bind   = vc4_hvs_bind,
> +	.unbind = vc4_hvs_unbind,
> +};
> +
> +static int vc4_hvs_dev_probe(struct platform_device *pdev)
> +{
> +	return component_add(&pdev->dev, &vc4_hvs_ops);
> +}
> +
> +static int vc4_hvs_dev_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &vc4_hvs_ops);
> +	return 0;
> +}
> +
> +static const struct of_device_id vc4_hvs_dt_match[] = {
> +	{ .compatible = "brcm,vc4-hvs" },
> +	{}
> +};
> +
> +static struct platform_driver vc4_hvs_driver = {
> +	.probe = vc4_hvs_dev_probe,
> +	.remove = vc4_hvs_dev_remove,
> +	.driver = {
> +		.name = "vc4_hvs",
> +		.of_match_table = vc4_hvs_dt_match,
> +	},
> +};
> +
> +void __init vc4_hvs_register(void)
> +{
> +	platform_driver_register(&vc4_hvs_driver);
> +}
> +
> +void __exit vc4_hvs_unregister(void)
> +{
> +	platform_driver_unregister(&vc4_hvs_driver);
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> new file mode 100644
> index 0000000..e5e96bc
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -0,0 +1,84 @@
> +/*
> + * Copyright (C) 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +/**
> + * DOC: VC4 KMS
> + *
> + * This is the general code for implementing KMS mode setting that
> + * doesn't clearly associate with any of the other objects (plane,
> + * crtc, HDMI encoder).
> + */
> +
> +#include "drm_crtc.h"
> +#include "drm_atomic_helper.h"
> +#include "drm_crtc_helper.h"
> +#include "drm_plane_helper.h"
> +#include "drm_fb_cma_helper.h"
> +#include "vc4_drv.h"
> +
> +static const struct drm_mode_config_funcs vc4_mode_funcs = {
> +	.atomic_check = drm_atomic_helper_check,
> +	.atomic_commit = drm_atomic_helper_commit,
> +	.fb_create = drm_fb_cma_create,
> +};
> +
> +/* Calls out to initialize all of the VC4 KMS objects. */
> +static int vc4_init_modeset_objects(struct drm_device *dev)
> +{
> +	struct drm_encoder *encoder;
> +	struct drm_connector *connector;
> +	int ret = 0;
> +
> +	encoder = vc4_hdmi_encoder_init(dev);
> +	if (IS_ERR(encoder)) {
> +		dev_err(dev->dev, "failed to construct HDMI encoder\n");
> +		ret = PTR_ERR(encoder);
> +		goto fail;
> +	}
> +
> +	connector = vc4_hdmi_connector_init(dev, encoder);
> +	if (IS_ERR(connector)) {
> +		ret = PTR_ERR(connector);
> +		dev_err(dev->dev, "failed to initialize HDMI connector\n");
> +		goto fail;
> +	}
> +
> +fail:
> +	return ret;
> +}
> +
> +int vc4_kms_load(struct drm_device *dev)
> +{
> +	int ret;
> +
> +	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
> +	if (ret < 0) {
> +		dev_err(dev->dev, "failed to initialize vblank\n");
> +		return ret;
> +	}
> +
> +	dev->mode_config.max_width = 2048;
> +	dev->mode_config.max_height = 2048;
> +	dev->mode_config.funcs = &vc4_mode_funcs;
> +	dev->mode_config.preferred_depth = 24;
> +
> +	ret = vc4_init_modeset_objects(dev);
> +	if (ret)
> +		goto fail;
> +
> +	drm_mode_config_reset(dev);
> +
> +	drm_fbdev_cma_init(dev, 32,
> +			   dev->mode_config.num_crtc,
> +			   dev->mode_config.num_connector);
> +
> +	drm_kms_helper_poll_init(dev);
> +
> +fail:
> +	return ret;
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> new file mode 100644
> index 0000000..cdd8b10
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -0,0 +1,320 @@
> +/*
> + * Copyright (C) 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +/**
> + * DOC: VC4 plane module
> + *
> + * Each DRM plane is a layer of pixels being scanned out by the HVS.
> + *
> + * At atomic modeset check time, we compute the HVS display element
> + * state that would be necessary for displaying the plane (giving us a
> + * chance to figure out if a plane configuration is invalid), then at
> + * atomic flush time the CRTC will ask us to write our element state
> + * into the region of the HVS that it has allocated for us.
> + */
> +
> +#include "vc4_drv.h"
> +#include "vc4_regs.h"
> +#include "drm_atomic_helper.h"
> +#include "drm_fb_cma_helper.h"
> +#include "drm_plane_helper.h"
> +
> +struct vc4_plane_state {
> +	struct drm_plane_state base;
> +	u32 *dlist;
> +	u32 dlist_size; /* Number of dwords in allocated for the display list */
> +	u32 dlist_count; /* Number of used dwords in the display list. */
> +};
> +
> +static inline struct vc4_plane_state *
> +to_vc4_plane_state(struct drm_plane_state *state)
> +{
> +	return (struct vc4_plane_state *)state;
> +}
> +
> +static const struct hvs_format {
> +	u32 drm; /* DRM_FORMAT_* */
> +	u32 hvs; /* HVS_FORMAT_* */
> +	u32 pixel_order;
> +	bool has_alpha;
> +} hvs_formats[] = {
> +	{
> +		.drm = DRM_FORMAT_XRGB8888, .hvs = HVS_PIXEL_FORMAT_RGBA8888,
> +		.pixel_order = HVS_PIXEL_ORDER_ABGR, .has_alpha = false,
> +	},
> +	{
> +		.drm = DRM_FORMAT_ARGB8888, .hvs = HVS_PIXEL_FORMAT_RGBA8888,
> +		.pixel_order = HVS_PIXEL_ORDER_ABGR, .has_alpha = true,
> +	},
> +};
> +
> +static const struct hvs_format *vc4_get_hvs_format(u32 drm_format)
> +{
> +	unsigned i;
> +
> +	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) {
> +		if (hvs_formats[i].drm == drm_format)
> +			return &hvs_formats[i];
> +	}
> +
> +	return NULL;
> +}
> +
> +static bool plane_enabled(struct drm_plane_state *state)
> +{
> +	return state->fb && state->crtc;
> +}
> +
> +struct drm_plane_state *vc4_plane_duplicate_state(struct drm_plane *plane)
> +{
> +	struct vc4_plane_state *vc4_state;
> +
> +	if (WARN_ON(!plane->state))
> +		return NULL;
> +
> +	vc4_state = kmemdup(plane->state, sizeof(*vc4_state), GFP_KERNEL);
> +	if (!vc4_state)
> +		return NULL;
> +
> +	__drm_atomic_helper_plane_duplicate_state(plane, &vc4_state->base);
> +
> +	if (vc4_state->dlist) {
> +		vc4_state->dlist = kmemdup(vc4_state->dlist,
> +					   vc4_state->dlist_count * 4,
> +					   GFP_KERNEL);
> +		if (!vc4_state->dlist) {
> +			kfree(vc4_state);
> +			return NULL;
> +		}
> +		vc4_state->dlist_size = vc4_state->dlist_count;
> +	}
> +
> +	return &vc4_state->base;
> +}
> +
> +void vc4_plane_destroy_state(struct drm_plane *plane,
> +			     struct drm_plane_state *state)
> +{
> +	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
> +
> +	kfree(vc4_state->dlist);
> +	__drm_atomic_helper_plane_destroy_state(plane, &vc4_state->base);
> +	kfree(state);
> +}
> +
> +/* Called during init to allocate the plane's atomic state. */
> +void vc4_plane_reset(struct drm_plane *plane)
> +{
> +	struct vc4_plane_state *vc4_state;
> +
> +	WARN_ON(plane->state);
> +
> +	vc4_state = kzalloc(sizeof(*vc4_state), GFP_KERNEL);
> +	if (!vc4_state)
> +		return;
> +
> +	plane->state = &vc4_state->base;
> +	vc4_state->base.plane = plane;
> +}
> +
> +static void vc4_dlist_write(struct vc4_plane_state *vc4_state, u32 val)
> +{
> +	if (vc4_state->dlist_count == vc4_state->dlist_size) {
> +		u32 new_size = max(4u, vc4_state->dlist_count * 2);
> +		u32 *new_dlist = kmalloc(new_size * 4, GFP_KERNEL);
> +
> +		if (!new_dlist)
> +			return;
> +		memcpy(new_dlist, vc4_state->dlist, vc4_state->dlist_count * 4);
> +
> +		kfree(vc4_state->dlist);
> +		vc4_state->dlist = new_dlist;
> +		vc4_state->dlist_size = new_size;
> +	}
> +
> +	vc4_state->dlist[vc4_state->dlist_count++] = val;
> +}
> +
> +/* Writes out a full display list for an active plane to the plane's
> + * private dlist state.
> + */
> +static int vc4_plane_mode_set(struct drm_plane *plane,
> +			      struct drm_plane_state *state)
> +{
> +	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
> +	struct drm_framebuffer *fb = state->fb;
> +	struct drm_gem_cma_object *bo = drm_fb_cma_get_gem_obj(fb, 0);
> +	u32 ctl0_offset = vc4_state->dlist_count;
> +	const struct hvs_format *format = vc4_get_hvs_format(fb->pixel_format);
> +	uint32_t offset = fb->offsets[0];
> +	int crtc_x = state->crtc_x;
> +	int crtc_y = state->crtc_y;
> +	int crtc_w = state->crtc_w;
> +	int crtc_h = state->crtc_h;
> +
> +	if (crtc_x < 0) {
> +		offset += drm_format_plane_cpp(fb->pixel_format, 0) * -crtc_x;
> +		crtc_w += crtc_x;
> +		crtc_x = 0;
> +	}
> +
> +	if (crtc_y < 0) {
> +		offset += fb->pitches[0] * -crtc_y;
> +		crtc_h += crtc_y;
> +		crtc_y = 0;
> +	}
> +
> +	vc4_dlist_write(vc4_state,
> +			SCALER_CTL0_VALID |
> +			(format->pixel_order << SCALER_CTL0_ORDER_SHIFT) |
> +			(format->hvs << SCALER_CTL0_PIXEL_FORMAT_SHIFT) |
> +			SCALER_CTL0_UNITY);
> +
> +	/* Position Word 0: Image Positions and Alpha Value */
> +	vc4_dlist_write(vc4_state,
> +			VC4_SET_FIELD(0xff, SCALER_POS0_FIXED_ALPHA) |
> +			VC4_SET_FIELD(crtc_x, SCALER_POS0_START_X) |
> +			VC4_SET_FIELD(crtc_y, SCALER_POS0_START_Y));
> +
> +	/* Position Word 1: Scaled Image Dimensions.
> +	 * Skipped due to SCALER_CTL0_UNITY scaling.
> +	 */
> +
> +	/* Position Word 2: Source Image Size, Alpha Mode */
> +	vc4_dlist_write(vc4_state,
> +			VC4_SET_FIELD(format->has_alpha ?
> +				      SCALER_POS2_ALPHA_MODE_PIPELINE :
> +				      SCALER_POS2_ALPHA_MODE_FIXED,
> +				      SCALER_POS2_ALPHA_MODE) |
> +			VC4_SET_FIELD(crtc_w, SCALER_POS2_WIDTH) |
> +			VC4_SET_FIELD(crtc_h, SCALER_POS2_HEIGHT));
> +
> +	/* Position Word 3: Context.  Written by the HVS. */
> +	vc4_dlist_write(vc4_state, 0xc0c0c0c0);
> +
> +	/* Pointer Word 0: RGB / Y Pointer */
> +	vc4_dlist_write(vc4_state, bo->paddr + offset);
> +
> +	/* Pointer Context Word 0: Written by the HVS */
> +	vc4_dlist_write(vc4_state, 0xc0c0c0c0);
> +
> +	/* Pitch word 0: Pointer 0 Pitch */
> +	vc4_dlist_write(vc4_state,
> +			VC4_SET_FIELD(fb->pitches[0], SCALER_SRC_PITCH));
> +
> +	vc4_state->dlist[ctl0_offset] |=
> +		VC4_SET_FIELD(vc4_state->dlist_count, SCALER_CTL0_SIZE);
> +
> +	return 0;
> +}
> +
> +/* If a modeset involves changing the setup of a plane, the atomic
> + * infrastructure will call this to validate a proposed plane setup.
> + * However, if a plane isn't getting updated, this (and the
> + * corresponding vc4_plane_atomic_update) won't get called.  Thus, we
> + * compute the dlist here and have all active plane dlists get updated
> + * in the CRTC's flush.
> + */
> +static int vc4_plane_atomic_check(struct drm_plane *plane,
> +				  struct drm_plane_state *state)
> +{
> +	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
> +
> +	vc4_state->dlist_count = 0;
> +
> +	if (plane_enabled(state))
> +		return vc4_plane_mode_set(plane, state);
> +	else
> +		return 0;
> +}
> +
> +static void vc4_plane_atomic_update(struct drm_plane *plane,
> +				    struct drm_plane_state *old_state)
> +{
> +	/* No contents here.  Since we don't know where in the CRTC's
> +	 * dlist we should be stored, our dlist is uploaded to the
> +	 * hardware with vc4_plane_write_dlist() at CRTC atomic_flush
> +	 * time.
> +	 */
> +}
> +
> +u32 vc4_plane_write_dlist(struct drm_plane *plane, u32 __iomem *dlist)
> +{
> +	struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state);
> +	int i;
> +
> +	/* Can't memcpy_toio() because it needs to be 32-bit writes. */
> +	for (i = 0; i < vc4_state->dlist_count; i++)
> +		writel(vc4_state->dlist[i], &dlist[i]);
> +
> +	return vc4_state->dlist_count;
> +}
> +
> +u32 vc4_plane_dlist_size(struct drm_plane_state *state)
> +{
> +	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
> +
> +	return vc4_state->dlist_count;
> +}
> +
> +static const struct drm_plane_helper_funcs vc4_plane_helper_funcs = {
> +	.prepare_fb = NULL,
> +	.cleanup_fb = NULL,
> +	.atomic_check = vc4_plane_atomic_check,
> +	.atomic_update = vc4_plane_atomic_update,
> +};
> +
> +static void vc4_plane_destroy(struct drm_plane *plane)
> +{
> +	drm_plane_helper_disable(plane);
> +	drm_plane_cleanup(plane);
> +}
> +
> +static const struct drm_plane_funcs vc4_plane_funcs = {
> +	.update_plane = drm_atomic_helper_update_plane,
> +	.disable_plane = drm_atomic_helper_disable_plane,
> +	.destroy = vc4_plane_destroy,
> +	.set_property = NULL,
> +	.reset = vc4_plane_reset,
> +	.atomic_duplicate_state = vc4_plane_duplicate_state,
> +	.atomic_destroy_state = vc4_plane_destroy_state,
> +};
> +
> +struct drm_plane *vc4_plane_init(struct drm_device *dev,
> +				 enum drm_plane_type type)
> +{
> +	struct drm_plane *plane = NULL;
> +	struct vc4_plane *vc4_plane;
> +	u32 formats[ARRAY_SIZE(hvs_formats)];
> +	int ret = 0;
> +	unsigned i;
> +
> +	vc4_plane = devm_kzalloc(dev->dev, sizeof(*vc4_plane),
> +				 GFP_KERNEL);
> +	if (!vc4_plane) {
> +		ret = -ENOMEM;
> +		goto fail;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++)
> +		formats[i] = hvs_formats[i].drm;
> +	plane = &vc4_plane->base;
> +	ret = drm_universal_plane_init(dev, plane, 0xff,
> +				       &vc4_plane_funcs,
> +				       formats, ARRAY_SIZE(formats),
> +				       type);
> +
> +	drm_plane_helper_add(plane, &vc4_plane_helper_funcs);
> +
> +	return plane;
> +fail:
> +	if (plane)
> +		vc4_plane_destroy(plane);
> +
> +	return ERR_PTR(ret);
> +}
> diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
> new file mode 100644
> index 0000000..0eff631
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_regs.h
> @@ -0,0 +1,562 @@
> +/*
> + *  Copyright ? 2014-2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#define VC4_MASK(high, low) (((1 << ((high) - (low) + 1)) - 1) << (low))
> +/* Using the GNU statement expression extension */
> +#define VC4_SET_FIELD(value, field)					\
> +	({								\
> +		uint32_t fieldval = (value) << field##_SHIFT;		\
> +		WARN_ON((fieldval & ~field##_MASK) != 0);		\
> +		fieldval & field##_MASK;				\
> +	 })
> +
> +#define VC4_GET_FIELD(word, field) (((word) & field##_MASK) >>		\
> +				    field##_SHIFT)
> +
> +#define V3D_IDENT0   0x00000
> +# define V3D_EXPECTED_IDENT0 \
> +	((2 << 24) | \
> +	('V' << 0) | \
> +	('3' << 8) | \
> +	 ('D' << 16))
> +
> +#define V3D_IDENT1   0x00004
> +/* Multiples of 1kb */
> +# define V3D_IDENT1_VPM_SIZE_MASK                      VC4_MASK(31, 28)
> +# define V3D_IDENT1_VPM_SIZE_SHIFT                     28
> +# define V3D_IDENT1_NSEM_MASK                          VC4_MASK(23, 16)
> +# define V3D_IDENT1_NSEM_SHIFT                         16
> +# define V3D_IDENT1_TUPS_MASK                          VC4_MASK(15, 12)
> +# define V3D_IDENT1_TUPS_SHIFT                         12
> +# define V3D_IDENT1_QUPS_MASK                          VC4_MASK(11, 8)
> +# define V3D_IDENT1_QUPS_SHIFT                         8
> +# define V3D_IDENT1_NSLC_MASK                          VC4_MASK(7, 4)
> +# define V3D_IDENT1_NSLC_SHIFT                         4
> +# define V3D_IDENT1_REV_MASK                           VC4_MASK(3, 0)
> +# define V3D_IDENT1_REV_SHIFT                          0
> +
> +#define V3D_IDENT2   0x00008
> +#define V3D_SCRATCH  0x00010
> +#define V3D_L2CACTL  0x00020
> +# define V3D_L2CACTL_L2CCLR                            (1 << 2)
> +# define V3D_L2CACTL_L2CDIS                            (1 << 1)
> +# define V3D_L2CACTL_L2CENA                            (1 << 0)
> +
> +#define V3D_SLCACTL  0x00024
> +# define V3D_SLCACTL_T1CC_MASK                         VC4_MASK(27, 24)
> +# define V3D_SLCACTL_T1CC_SHIFT                        24
> +# define V3D_SLCACTL_T0CC_MASK                         VC4_MASK(19, 16)
> +# define V3D_SLCACTL_T0CC_SHIFT                        16
> +# define V3D_SLCACTL_UCC_MASK                          VC4_MASK(11, 8)
> +# define V3D_SLCACTL_UCC_SHIFT                         8
> +# define V3D_SLCACTL_ICC_MASK                          VC4_MASK(3, 0)
> +# define V3D_SLCACTL_ICC_SHIFT                         0
> +
> +#define V3D_INTCTL   0x00030
> +#define V3D_INTENA   0x00034
> +#define V3D_INTDIS   0x00038
> +# define V3D_INT_SPILLUSE                              (1 << 3)
> +# define V3D_INT_OUTOMEM                               (1 << 2)
> +# define V3D_INT_FLDONE                                (1 << 1)
> +# define V3D_INT_FRDONE                                (1 << 0)
> +
> +#define V3D_CT0CS    0x00100
> +#define V3D_CT1CS    0x00104
> +#define V3D_CTNCS(n) (V3D_CT0CS + 4 * n)
> +# define V3D_CTRSTA      (1 << 15)
> +# define V3D_CTSEMA      (1 << 12)
> +# define V3D_CTRTSD      (1 << 8)
> +# define V3D_CTRUN       (1 << 5)
> +# define V3D_CTSUBS      (1 << 4)
> +# define V3D_CTERR       (1 << 3)
> +# define V3D_CTMODE      (1 << 0)
> +
> +#define V3D_CT0EA    0x00108
> +#define V3D_CT1EA    0x0010c
> +#define V3D_CTNEA(n) (V3D_CT0EA + 4 * (n))
> +#define V3D_CT0CA    0x00110
> +#define V3D_CT1CA    0x00114
> +#define V3D_CTNCA(n) (V3D_CT0CA + 4 * (n))
> +#define V3D_CT00RA0  0x00118
> +#define V3D_CT01RA0  0x0011c
> +#define V3D_CTNRA0(n) (V3D_CT00RA0 + 4 * (n))
> +#define V3D_CT0LC    0x00120
> +#define V3D_CT1LC    0x00124
> +#define V3D_CTNLC(n) (V3D_CT0LC + 4 * (n))
> +#define V3D_CT0PC    0x00128
> +#define V3D_CT1PC    0x0012c
> +#define V3D_CTNPC(n) (V3D_CT0PC + 4 * (n))
> +
> +#define V3D_PCS      0x00130
> +# define V3D_BMOOM       (1 << 8)
> +# define V3D_RMBUSY      (1 << 3)
> +# define V3D_RMACTIVE    (1 << 2)
> +# define V3D_BMBUSY      (1 << 1)
> +# define V3D_BMACTIVE    (1 << 0)
> +
> +#define V3D_BFC      0x00134
> +#define V3D_RFC      0x00138
> +#define V3D_BPCA     0x00300
> +#define V3D_BPCS     0x00304
> +#define V3D_BPOA     0x00308
> +#define V3D_BPOS     0x0030c
> +#define V3D_BXCF     0x00310
> +#define V3D_SQRSV0   0x00410
> +#define V3D_SQRSV1   0x00414
> +#define V3D_SQCNTL   0x00418
> +#define V3D_SRQPC    0x00430
> +#define V3D_SRQUA    0x00434
> +#define V3D_SRQUL    0x00438
> +#define V3D_SRQCS    0x0043c
> +#define V3D_VPACNTL  0x00500
> +#define V3D_VPMBASE  0x00504
> +#define V3D_PCTRC    0x00670
> +#define V3D_PCTRE    0x00674
> +#define V3D_PCTR0    0x00680
> +#define V3D_PCTRS0   0x00684
> +#define V3D_PCTR1    0x00688
> +#define V3D_PCTRS1   0x0068c
> +#define V3D_PCTR2    0x00690
> +#define V3D_PCTRS2   0x00694
> +#define V3D_PCTR3    0x00698
> +#define V3D_PCTRS3   0x0069c
> +#define V3D_PCTR4    0x006a0
> +#define V3D_PCTRS4   0x006a4
> +#define V3D_PCTR5    0x006a8
> +#define V3D_PCTRS5   0x006ac
> +#define V3D_PCTR6    0x006b0
> +#define V3D_PCTRS6   0x006b4
> +#define V3D_PCTR7    0x006b8
> +#define V3D_PCTRS7   0x006bc
> +#define V3D_PCTR8    0x006c0
> +#define V3D_PCTRS8   0x006c4
> +#define V3D_PCTR9    0x006c8
> +#define V3D_PCTRS9   0x006cc
> +#define V3D_PCTR10   0x006d0
> +#define V3D_PCTRS10  0x006d4
> +#define V3D_PCTR11   0x006d8
> +#define V3D_PCTRS11  0x006dc
> +#define V3D_PCTR12   0x006e0
> +#define V3D_PCTRS12  0x006e4
> +#define V3D_PCTR13   0x006e8
> +#define V3D_PCTRS13  0x006ec
> +#define V3D_PCTR14   0x006f0
> +#define V3D_PCTRS14  0x006f4
> +#define V3D_PCTR15   0x006f8
> +#define V3D_PCTRS15  0x006fc
> +#define V3D_BGE      0x00f00
> +#define V3D_FDBGO    0x00f04
> +#define V3D_FDBGB    0x00f08
> +#define V3D_FDBGR    0x00f0c
> +#define V3D_FDBGS    0x00f10
> +#define V3D_ERRSTAT  0x00f20
> +
> +#define PV_CONTROL				0x00
> +# define PV_CONTROL_FORMAT_MASK			VC4_MASK(23, 21)
> +# define PV_CONTROL_FORMAT_SHIFT		21
> +# define PV_CONTROL_FORMAT_24			0
> +# define PV_CONTROL_FORMAT_DSIV_16		1
> +# define PV_CONTROL_FORMAT_DSIC_16		2
> +# define PV_CONTROL_FORMAT_DSIV_18		3
> +# define PV_CONTROL_FORMAT_DSIV_24		4
> +
> +# define PV_CONTROL_FIFO_LEVEL_MASK		VC4_MASK(20, 15)
> +# define PV_CONTROL_FIFO_LEVEL_SHIFT		15
> +# define PV_CONTROL_CLR_AT_START		(1 << 14)
> +# define PV_CONTROL_TRIGGER_UNDERFLOW		(1 << 13)
> +# define PV_CONTROL_WAIT_HSTART			(1 << 12)
> +# define PV_CONTROL_CLK_SELECT_DSI		0
> +# define PV_CONTROL_CLK_SELECT_DPI_SMI_HDMI	1
> +# define PV_CONTROL_CLK_SELECT_MASK		VC4_MASK(3, 2)
> +# define PV_CONTROL_CLK_SELECT_SHIFT		2
> +# define PV_CONTROL_FIFO_CLR			(1 << 1)
> +# define PV_CONTROL_EN				(1 << 0)
> +
> +#define PV_V_CONTROL				0x04
> +# define PV_VCONTROL_CONTINUOUS			(1 << 1)
> +# define PV_VCONTROL_VIDEN			(1 << 0)
> +
> +#define PV_VSYNCD				0x08
> +
> +#define PV_HORZA				0x0c
> +# define PV_HORZA_HBP_MASK			VC4_MASK(31, 16)
> +# define PV_HORZA_HBP_SHIFT			16
> +# define PV_HORZA_HSYNC_MASK			VC4_MASK(15, 0)
> +# define PV_HORZA_HSYNC_SHIFT			0
> +
> +#define PV_HORZB				0x10
> +# define PV_HORZB_HFP_MASK			VC4_MASK(31, 16)
> +# define PV_HORZB_HFP_SHIFT			16
> +# define PV_HORZB_HACTIVE_MASK			VC4_MASK(15, 0)
> +# define PV_HORZB_HACTIVE_SHIFT			0
> +
> +#define PV_VERTA				0x14
> +# define PV_VERTA_VBP_MASK			VC4_MASK(31, 16)
> +# define PV_VERTA_VBP_SHIFT			16
> +# define PV_VERTA_VSYNC_MASK			VC4_MASK(15, 0)
> +# define PV_VERTA_VSYNC_SHIFT			0
> +
> +#define PV_VERTB				0x18
> +# define PV_VERTB_VFP_MASK			VC4_MASK(31, 16)
> +# define PV_VERTB_VFP_SHIFT			16
> +# define PV_VERTB_VACTIVE_MASK			VC4_MASK(15, 0)
> +# define PV_VERTB_VACTIVE_SHIFT			0
> +
> +#define PV_VERTA_EVEN				0x1c
> +#define PV_VERTB_EVEN				0x20
> +
> +#define PV_INTEN				0x24
> +#define PV_INTSTAT				0x28
> +# define PV_INT_VID_IDLE			(1 << 9)
> +# define PV_INT_VFP_END				(1 << 8)
> +# define PV_INT_VFP_START			(1 << 7)
> +# define PV_INT_VACT_START			(1 << 6)
> +# define PV_INT_VBP_START			(1 << 5)
> +# define PV_INT_VSYNC_START			(1 << 4)
> +# define PV_INT_HFP_START			(1 << 3)
> +# define PV_INT_HACT_START			(1 << 2)
> +# define PV_INT_HBP_START			(1 << 1)
> +# define PV_INT_HSYNC_START			(1 << 0)
> +
> +#define PV_STAT					0x2c
> +
> +#define PV_HACT_ACT				0x30
> +
> +#define SCALER_DISPCTRL                         0x00000000
> +/* Global register for clock gating the HVS */
> +# define SCALER_DISPCTRL_ENABLE			(1 << 31)
> +# define SCALER_DISPCTRL_DSP2EISLUR		(1 << 15)
> +# define SCALER_DISPCTRL_DSP1EISLUR		(1 << 14)
> +/* Enables Display 0 short line and underrun contribution to
> + * SCALER_DISPSTAT_IRQDISP0.  Note that short frame contributions are
> + * always enabled.
> + */
> +# define SCALER_DISPCTRL_DSP0EISLUR		(1 << 13)
> +# define SCALER_DISPCTRL_DSP2EIEOLN		(1 << 12)
> +# define SCALER_DISPCTRL_DSP2EIEOF		(1 << 11)
> +# define SCALER_DISPCTRL_DSP1EIEOLN		(1 << 10)
> +# define SCALER_DISPCTRL_DSP1EIEOF		(1 << 9)
> +/* Enables Display 0 end-of-line-N contribution to
> + * SCALER_DISPSTAT_IRQDISP0
> + */
> +# define SCALER_DISPCTRL_DSP0EIEOLN		(1 << 8)
> +/* Enables Display 0 EOF contribution to SCALER_DISPSTAT_IRQDISP0 */
> +# define SCALER_DISPCTRL_DSP0EIEOF		(1 << 7)
> +
> +# define SCALER_DISPCTRL_SLVRDEIRQ		(1 << 6)
> +# define SCALER_DISPCTRL_SLVWREIRQ		(1 << 5)
> +# define SCALER_DISPCTRL_DMAEIRQ		(1 << 4)
> +# define SCALER_DISPCTRL_DISP2EIRQ		(1 << 3)
> +# define SCALER_DISPCTRL_DISP1EIRQ		(1 << 2)
> +/* Enables interrupt generation on the enabled EOF/EOLN/EISLUR
> + * bits and short frames..
> + */
> +# define SCALER_DISPCTRL_DISP0EIRQ		(1 << 1)
> +/* Enables interrupt generation on scaler profiler interrupt. */
> +# define SCALER_DISPCTRL_SCLEIRQ		(1 << 0)
> +
> +#define SCALER_DISPSTAT                         0x00000004
> +# define SCALER_DISPSTAT_COBLOW2		(1 << 29)
> +# define SCALER_DISPSTAT_EOLN2			(1 << 28)
> +# define SCALER_DISPSTAT_ESFRAME2		(1 << 27)
> +# define SCALER_DISPSTAT_ESLINE2		(1 << 26)
> +# define SCALER_DISPSTAT_EUFLOW2		(1 << 25)
> +# define SCALER_DISPSTAT_EOF2			(1 << 24)
> +
> +# define SCALER_DISPSTAT_COBLOW1		(1 << 21)
> +# define SCALER_DISPSTAT_EOLN1			(1 << 20)
> +# define SCALER_DISPSTAT_ESFRAME1		(1 << 19)
> +# define SCALER_DISPSTAT_ESLINE1		(1 << 18)
> +# define SCALER_DISPSTAT_EUFLOW1		(1 << 17)
> +# define SCALER_DISPSTAT_EOF1			(1 << 16)
> +
> +# define SCALER_DISPSTAT_RESP_MASK		VC4_MASK(15, 14)
> +# define SCALER_DISPSTAT_RESP_SHIFT		14
> +# define SCALER_DISPSTAT_RESP_OKAY		0
> +# define SCALER_DISPSTAT_RESP_EXOKAY		1
> +# define SCALER_DISPSTAT_RESP_SLVERR		2
> +# define SCALER_DISPSTAT_RESP_DECERR		3
> +
> +# define SCALER_DISPSTAT_COBLOW0		(1 << 13)
> +/* Set when the DISPEOLN line is done compositing. */
> +# define SCALER_DISPSTAT_EOLN0			(1 << 12)
> +/* Set when VSTART is seen but there are still pixels in the current
> + * output line.
> + */
> +# define SCALER_DISPSTAT_ESFRAME0		(1 << 11)
> +/* Set when HSTART is seen but there are still pixels in the current
> + * output line.
> + */
> +# define SCALER_DISPSTAT_ESLINE0		(1 << 10)
> +/* Set when the the downstream tries to read from the display FIFO
> + * while it's empty.
> + */
> +# define SCALER_DISPSTAT_EUFLOW0		(1 << 9)
> +/* Set when the display mode changes from RUN to EOF */
> +# define SCALER_DISPSTAT_EOF0			(1 << 8)
> +
> +/* Set on AXI invalid DMA ID error. */
> +# define SCALER_DISPSTAT_DMA_ERROR		(1 << 7)
> +/* Set on AXI slave read decode error */
> +# define SCALER_DISPSTAT_IRQSLVRD		(1 << 6)
> +/* Set on AXI slave write decode error */
> +# define SCALER_DISPSTAT_IRQSLVWR		(1 << 5)
> +/* Set when SCALER_DISPSTAT_DMA_ERROR is set, or
> + * SCALER_DISPSTAT_RESP_ERROR is not SCALER_DISPSTAT_RESP_OKAY.
> + */
> +# define SCALER_DISPSTAT_IRQDMA			(1 << 4)
> +# define SCALER_DISPSTAT_IRQDISP2		(1 << 3)
> +# define SCALER_DISPSTAT_IRQDISP1		(1 << 2)
> +/* Set when any of the EOF/EOLN/ESFRAME/ESLINE bits are set and their
> + * corresponding interrupt bit is enabled in DISPCTRL.
> + */
> +# define SCALER_DISPSTAT_IRQDISP0		(1 << 1)
> +/* On read, the profiler interrupt.  On write, clear *all* interrupt bits. */
> +# define SCALER_DISPSTAT_IRQSCL			(1 << 0)
> +
> +#define SCALER_DISPID                           0x00000008
> +#define SCALER_DISPECTRL                        0x0000000c
> +#define SCALER_DISPPROF                         0x00000010
> +#define SCALER_DISPDITHER                       0x00000014
> +#define SCALER_DISPEOLN                         0x00000018
> +#define SCALER_DISPLIST0                        0x00000020
> +#define SCALER_DISPLIST1                        0x00000024
> +#define SCALER_DISPLIST2                        0x00000028
> +#define SCALER_DISPLSTAT                        0x0000002c
> +#define SCALER_DISPLISTX(x)			(SCALER_DISPLIST0 +	\
> +						 (x) * (SCALER_DISPLIST1 - \
> +							SCALER_DISPLIST0))
> +
> +#define SCALER_DISPLACT0                        0x00000030
> +#define SCALER_DISPLACT1                        0x00000034
> +#define SCALER_DISPLACT2                        0x00000038
> +#define SCALER_DISPCTRL0                        0x00000040
> +# define SCALER_DISPCTRLX_ENABLE		(1 << 31)
> +# define SCALER_DISPCTRLX_RESET			(1 << 30)
> +# define SCALER_DISPCTRLX_WIDTH_MASK		VC4_MASK(23, 12)
> +# define SCALER_DISPCTRLX_WIDTH_SHIFT		12
> +# define SCALER_DISPCTRLX_HEIGHT_MASK		VC4_MASK(11, 0)
> +# define SCALER_DISPCTRLX_HEIGHT_SHIFT		0
> +
> +#define SCALER_DISPBKGND0                       0x00000044
> +#define SCALER_DISPSTAT0                        0x00000048
> +#define SCALER_DISPBASE0                        0x0000004c
> +# define SCALER_DISPSTATX_MODE_MASK		VC4_MASK(31, 30)
> +# define SCALER_DISPSTATX_MODE_SHIFT		30
> +# define SCALER_DISPSTATX_MODE_DISABLED		0
> +# define SCALER_DISPSTATX_MODE_INIT		1
> +# define SCALER_DISPSTATX_MODE_RUN		2
> +# define SCALER_DISPSTATX_MODE_EOF		3
> +# define SCALER_DISPSTATX_FULL			(1 << 29)
> +# define SCALER_DISPSTATX_EMPTY			(1 << 28)
> +#define SCALER_DISPCTRL1                        0x00000050
> +#define SCALER_DISPBKGND1                       0x00000054
> +#define SCALER_DISPSTAT1                        0x00000058
> +#define SCALER_DISPSTATX(x)			(SCALER_DISPSTAT0 +        \
> +						 (x) * (SCALER_DISPSTAT1 - \
> +							SCALER_DISPSTAT0))
> +#define SCALER_DISPBASE1                        0x0000005c
> +#define SCALER_DISPCTRL2                        0x00000060
> +#define SCALER_DISPCTRLX(x)			(SCALER_DISPCTRL0 +        \
> +						 (x) * (SCALER_DISPCTRL1 - \
> +							SCALER_DISPCTRL0))
> +#define SCALER_DISPBKGND2                       0x00000064
> +#define SCALER_DISPSTAT2                        0x00000068
> +#define SCALER_DISPBASE2                        0x0000006c
> +#define SCALER_DISPALPHA2                       0x00000070
> +#define SCALER_GAMADDR                          0x00000078
> +#define SCALER_GAMDATA                          0x000000e0
> +#define SCALER_DLIST_START                      0x00002000
> +#define SCALER_DLIST_SIZE                       0x00004000
> +
> +#define VC4_HDMI_CORE_REV			0x000
> +
> +#define VC4_HDMI_SW_RESET_CONTROL		0x004
> +# define VC4_HDMI_SW_RESET_FORMAT_DETECT	(1 << 1)
> +# define VC4_HDMI_SW_RESET_HDMI			(1 << 0)
> +
> +#define VC4_HDMI_HOTPLUG_INT			0x008
> +
> +#define VC4_HDMI_HOTPLUG			0x00c
> +# define VC4_HDMI_HOTPLUG_CONNECTED		(1 << 0)
> +
> +#define VC4_HDMI_RAM_PACKET_CONFIG		0x0a0
> +# define VC4_HDMI_RAM_PACKET_ENABLE		(1 << 16)
> +
> +#define VC4_HDMI_HORZA				0x0c4
> +# define VC4_HDMI_HORZA_VPOS			(1 << 14)
> +# define VC4_HDMI_HORZA_HPOS			(1 << 13)
> +/* Horizontal active pixels (hdisplay). */
> +# define VC4_HDMI_HORZA_HAP_MASK		VC4_MASK(12, 0)
> +# define VC4_HDMI_HORZA_HAP_SHIFT		0
> +
> +#define VC4_HDMI_HORZB				0x0c8
> +/* Horizontal pack porch (htotal - hsync_end). */
> +# define VC4_HDMI_HORZB_HBP_MASK		VC4_MASK(29, 20)
> +# define VC4_HDMI_HORZB_HBP_SHIFT		20
> +/* Horizontal sync pulse (hsync_end - hsync_start). */
> +# define VC4_HDMI_HORZB_HSP_MASK		VC4_MASK(19, 10)
> +# define VC4_HDMI_HORZB_HSP_SHIFT		10
> +/* Horizontal front porch (hsync_start - hdisplay). */
> +# define VC4_HDMI_HORZB_HFP_MASK		VC4_MASK(9, 0)
> +# define VC4_HDMI_HORZB_HFP_SHIFT		0
> +
> +#define VC4_HDMI_FIFO_CTL			0x05c
> +# define VC4_HDMI_FIFO_CTL_RECENTER_DONE	(1 << 14)
> +# define VC4_HDMI_FIFO_CTL_USE_EMPTY		(1 << 13)
> +# define VC4_HDMI_FIFO_CTL_ON_VB		(1 << 7)
> +# define VC4_HDMI_FIFO_CTL_RECENTER		(1 << 6)
> +# define VC4_HDMI_FIFO_CTL_FIFO_RESET		(1 << 5)
> +# define VC4_HDMI_FIFO_CTL_USE_PLL_LOCK		(1 << 4)
> +# define VC4_HDMI_FIFO_CTL_INV_CLK_XFR		(1 << 3)
> +# define VC4_HDMI_FIFO_CTL_CAPTURE_PTR		(1 << 2)
> +# define VC4_HDMI_FIFO_CTL_USE_FULL		(1 << 1)
> +# define VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N	(1 << 0)
> +# define VC4_HDMI_FIFO_VALID_WRITE_MASK		0xefff
> +
> +#define VC4_HDMI_SCHEDULER_CONTROL		0x0c0
> +# define VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT (1 << 15)
> +# define VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS (1 << 5)
> +# define VC4_HDMI_SCHEDULER_CONTROL_VERT_ALWAYS_KEEPOUT	(1 << 3)
> +# define VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE	(1 << 1)
> +# define VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI	(1 << 0)
> +
> +#define VC4_HDMI_VERTA0				0x0cc
> +#define VC4_HDMI_VERTA1				0x0d4
> +/* Vertical sync pulse (vsync_end - vsync_start). */
> +# define VC4_HDMI_VERTA_VSP_MASK		VC4_MASK(24, 20)
> +# define VC4_HDMI_VERTA_VSP_SHIFT		20
> +/* Vertical front porch (vsync_start - vdisplay). */
> +# define VC4_HDMI_VERTA_VFP_MASK		VC4_MASK(19, 13)
> +# define VC4_HDMI_VERTA_VFP_SHIFT		13
> +/* Vertical active lines (vdisplay). */
> +# define VC4_HDMI_VERTA_VAL_MASK		VC4_MASK(12, 0)
> +# define VC4_HDMI_VERTA_VAL_SHIFT		0
> +
> +#define VC4_HDMI_VERTB0				0x0d0
> +#define VC4_HDMI_VERTB1				0x0d8
> +/* Vertical sync pulse offset (for interlaced) */
> +# define VC4_HDMI_VERTB_VSPO_MASK		VC4_MASK(21, 9)
> +# define VC4_HDMI_VERTB_VSPO_SHIFT		9
> +/* Vertical pack porch (vtotal - vsync_end). */
> +# define VC4_HDMI_VERTB_VBP_MASK		VC4_MASK(8, 0)
> +# define VC4_HDMI_VERTB_VBP_SHIFT		0
> +
> +#define VC4_HDMI_TX_PHY_RESET_CTL		0x2c0
> +
> +#define VC4_HD_M_CTL				0x00c
> +# define VC4_HD_M_SW_RST			(1 << 2)
> +# define VC4_HD_M_ENABLE			(1 << 0)
> +
> +#define VC4_HD_MAI_CTL				0x014
> +
> +#define VC4_HD_VID_CTL				0x038
> +# define VC4_HD_VID_CTL_ENABLE			(1 << 31)
> +# define VC4_HD_VID_CTL_UNDERFLOW_ENABLE	(1 << 30)
> +# define VC4_HD_VID_CTL_FRAME_COUNTER_RESET	(1 << 29)
> +# define VC4_HD_VID_CTL_VSYNC_LOW		(1 << 28)
> +# define VC4_HD_VID_CTL_HSYNC_LOW		(1 << 27)
> +
> +#define VC4_HD_CSC_CTL				0x040
> +# define VC4_HD_CSC_CTL_ORDER_MASK		VC4_MASK(7, 5)
> +# define VC4_HD_CSC_CTL_ORDER_SHIFT		5
> +# define VC4_HD_CSC_CTL_ORDER_RGB		0
> +# define VC4_HD_CSC_CTL_ORDER_BGR		1
> +# define VC4_HD_CSC_CTL_ORDER_BRG		2
> +# define VC4_HD_CSC_CTL_ORDER_GRB		3
> +# define VC4_HD_CSC_CTL_ORDER_GBR		4
> +# define VC4_HD_CSC_CTL_ORDER_RBG		5
> +# define VC4_HD_CSC_CTL_PADMSB			(1 << 4)
> +# define VC4_HD_CSC_CTL_MODE_MASK		VC4_MASK(3, 2)
> +# define VC4_HD_CSC_CTL_MODE_SHIFT		2
> +# define VC4_HD_CSC_CTL_MODE_RGB_TO_SD_YPRPB	0
> +# define VC4_HD_CSC_CTL_MODE_RGB_TO_HD_YPRPB	1
> +# define VC4_HD_CSC_CTL_MODE_CUSTOM		2
> +# define VC4_HD_CSC_CTL_RGB2YCC			(1 << 1)
> +# define VC4_HD_CSC_CTL_ENABLE			(1 << 0)
> +
> +#define VC4_HD_FRAME_COUNT			0x068
> +
> +/* HVS display list information. */
> +#define HVS_BOOTLOADER_DLIST_END                32
> +
> +enum hvs_pixel_format {
> +	/* 8bpp */
> +	HVS_PIXEL_FORMAT_RGB332 = 0,
> +	/* 16bpp */
> +	HVS_PIXEL_FORMAT_RGBA4444 = 1,
> +	HVS_PIXEL_FORMAT_RGB555 = 2,
> +	HVS_PIXEL_FORMAT_RGBA5551 = 3,
> +	HVS_PIXEL_FORMAT_RGB565 = 4,
> +	/* 24bpp */
> +	HVS_PIXEL_FORMAT_RGB888 = 5,
> +	HVS_PIXEL_FORMAT_RGBA6666 = 6,
> +	/* 32bpp */
> +	HVS_PIXEL_FORMAT_RGBA8888 = 7
> +};
> +
> +/* Note: the LSB is the rightmost character shown.  Only valid for
> + * HVS_PIXEL_FORMAT_RGB8888, not RGB888.
> + */
> +#define HVS_PIXEL_ORDER_RGBA			0
> +#define HVS_PIXEL_ORDER_BGRA			1
> +#define HVS_PIXEL_ORDER_ARGB			2
> +#define HVS_PIXEL_ORDER_ABGR			3
> +
> +#define HVS_PIXEL_ORDER_XBRG			0
> +#define HVS_PIXEL_ORDER_XRBG			1
> +#define HVS_PIXEL_ORDER_XRGB			2
> +#define HVS_PIXEL_ORDER_XBGR			3
> +
> +#define HVS_PIXEL_ORDER_XYCBCR			0
> +#define HVS_PIXEL_ORDER_XYCRCB			1
> +#define HVS_PIXEL_ORDER_YXCBCR			2
> +#define HVS_PIXEL_ORDER_YXCRCB			3
> +
> +#define SCALER_CTL0_END				(1 << 31)
> +#define SCALER_CTL0_VALID			(1 << 30)
> +
> +#define SCALER_CTL0_SIZE_MASK			VC4_MASK(29, 24)
> +#define SCALER_CTL0_SIZE_SHIFT			24
> +
> +#define SCALER_CTL0_HFLIP                       (1 << 16)
> +#define SCALER_CTL0_VFLIP                       (1 << 15)
> +
> +#define SCALER_CTL0_ORDER_MASK			VC4_MASK(14, 13)
> +#define SCALER_CTL0_ORDER_SHIFT			13
> +
> +/* Set to indicate no scaling. */
> +#define SCALER_CTL0_UNITY			(1 << 4)
> +
> +#define SCALER_CTL0_PIXEL_FORMAT_MASK		VC4_MASK(3, 0)
> +#define SCALER_CTL0_PIXEL_FORMAT_SHIFT		0
> +
> +#define SCALER_POS0_FIXED_ALPHA_MASK		VC4_MASK(31, 24)
> +#define SCALER_POS0_FIXED_ALPHA_SHIFT		24
> +
> +#define SCALER_POS0_START_Y_MASK		VC4_MASK(23, 12)
> +#define SCALER_POS0_START_Y_SHIFT		12
> +
> +#define SCALER_POS0_START_X_MASK		VC4_MASK(11, 0)
> +#define SCALER_POS0_START_X_SHIFT		0
> +
> +#define SCALER_POS2_ALPHA_MODE_MASK		VC4_MASK(31, 30)
> +#define SCALER_POS2_ALPHA_MODE_SHIFT		30
> +#define SCALER_POS2_ALPHA_MODE_PIPELINE		0
> +#define SCALER_POS2_ALPHA_MODE_FIXED		1
> +#define SCALER_POS2_ALPHA_MODE_FIXED_NONZERO	2
> +#define SCALER_POS2_ALPHA_MODE_FIXED_OVER_0x07	3
> +
> +#define SCALER_POS2_HEIGHT_MASK			VC4_MASK(27, 16)
> +#define SCALER_POS2_HEIGHT_SHIFT		16
> +
> +#define SCALER_POS2_WIDTH_MASK			VC4_MASK(11, 0)
> +#define SCALER_POS2_WIDTH_SHIFT			0
> +
> +#define SCALER_SRC_PITCH_MASK			VC4_MASK(15, 0)
> +#define SCALER_SRC_PITCH_SHIFT			0
> -- 
> 2.1.4
> 
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> dri-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Eric Anholt]

Daniel Vetter <daniel@ffwll.ch> writes:

> On Wed, Aug 12, 2015 at 05:56:16PM -0700, Eric Anholt wrote:
>> This is the start of a full VC4 driver.  Right now this just supports
>> configuring the display using a pre-existing video mode (because
>> changing the pixel clock isn't available yet, and doesn't work when it
>> is).  However, this is enough for fbcon and bringing up X using
>> xf86-video-modesetting.
>> 
>> Signed-off-by: Eric Anholt <eric@anholt.net>
>> ---
>>  drivers/gpu/drm/Kconfig           |   2 +
>>  drivers/gpu/drm/Makefile          |   1 +
>>  drivers/gpu/drm/vc4/Kconfig       |  14 +
>>  drivers/gpu/drm/vc4/Makefile      |  18 ++
>>  drivers/gpu/drm/vc4/vc4_bo.c      |  54 ++++
>>  drivers/gpu/drm/vc4/vc4_crtc.c    | 583 ++++++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/vc4/vc4_debugfs.c |  38 +++
>>  drivers/gpu/drm/vc4/vc4_drv.c     | 249 +++++++++++++++
>>  drivers/gpu/drm/vc4/vc4_drv.h     | 123 +++++++
>>  drivers/gpu/drm/vc4/vc4_hdmi.c    | 651 ++++++++++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/vc4/vc4_hvs.c     | 172 ++++++++++
>>  drivers/gpu/drm/vc4/vc4_kms.c     |  84 +++++
>>  drivers/gpu/drm/vc4/vc4_plane.c   | 320 +++++++++++++++++++
>>  drivers/gpu/drm/vc4/vc4_regs.h    | 562 ++++++++++++++++++++++++++++++++
>>  14 files changed, 2871 insertions(+)
>>  create mode 100644 drivers/gpu/drm/vc4/Kconfig
>>  create mode 100644 drivers/gpu/drm/vc4/Makefile
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_bo.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_crtc.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_debugfs.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.h
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_hdmi.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_hvs.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_kms.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_plane.c
>>  create mode 100644 drivers/gpu/drm/vc4/vc4_regs.h
>
> Made a quick pass and found a few things to update to latest drm
> developments. Of course didn't look at the hardware details since no clue,
> but looks really nice overall.
> -Daniel

If you have anything about the hardware that you were curious about, I'd
be interested in trying to explain them in the comments to the extent
that I can.  It's unfortunate that we haven't shipped docs for the
display side of things, but had to do a lot of reading of the verilog
just to get this far, anyway.

>> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>> index c46ca31..1730a76 100644
>> --- a/drivers/gpu/drm/Kconfig
>> +++ b/drivers/gpu/drm/Kconfig
>> @@ -240,3 +240,5 @@ source "drivers/gpu/drm/sti/Kconfig"
>>  source "drivers/gpu/drm/amd/amdkfd/Kconfig"
>>  
>>  source "drivers/gpu/drm/imx/Kconfig"
>> +
>> +source "drivers/gpu/drm/vc4/Kconfig"
>> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>> index 5713d05..b991ac5 100644
>> --- a/drivers/gpu/drm/Makefile
>> +++ b/drivers/gpu/drm/Makefile
>> @@ -42,6 +42,7 @@ obj-$(CONFIG_DRM_MGA)	+= mga/
>>  obj-$(CONFIG_DRM_I810)	+= i810/
>>  obj-$(CONFIG_DRM_I915)  += i915/
>>  obj-$(CONFIG_DRM_MGAG200) += mgag200/
>> +obj-$(CONFIG_DRM_VC4)  += vc4/
>>  obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus/
>>  obj-$(CONFIG_DRM_SIS)   += sis/
>>  obj-$(CONFIG_DRM_SAVAGE)+= savage/
>> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
>> new file mode 100644
>> index 0000000..130cc94
>> --- /dev/null
>> +++ b/drivers/gpu/drm/vc4/Kconfig
>> @@ -0,0 +1,14 @@
>> +config DRM_VC4
>> +	tristate "Broadcom VC4 Graphics"
>> +	depends on ARCH_BCM2835
>> +	depends on DRM
>> +	select DRM_KMS_HELPER
>> +	select DRM_KMS_FB_HELPER
>> +	select DRM_KMS_CMA_HELPER
>
> drm-misc/linux-next already has Archit's patches to enable/disable fbdev
> in the core code, so you don't need to bother about these selects here any
> more, it'll no-op out if drm fbdev emulation isn't enabled. Since you're
> reusing cma fbdev helpers I don't think there's any need for other changes
> because of this.

It sounds like I should rebase on that, then?

>> +	help
>> +	  Choose this option if you have a system that has a Broadcom
>> +	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
>> +
>> +	  This driver requires that "avoid_warnings=2" be present in
>> +	  the config.txt for the firmware, to keep it from smashing
>> +	  our display setup.
>> diff --git a/drivers/gpu/drm/vc4/Makefile b/drivers/gpu/drm/vc4/Makefile
>> new file mode 100644
>> index 0000000..4aa07ca
>> --- /dev/null
>> +++ b/drivers/gpu/drm/vc4/Makefile
>> @@ -0,0 +1,18 @@
>> +ccflags-y := -Iinclude/drm
>> +
>> +# Please keep these build lists sorted!
>> +
>> +# core driver code
>> +vc4-y := \
>> +	vc4_bo.o \
>> +	vc4_crtc.o \
>> +	vc4_drv.o \
>> +	vc4_kms.o \
>> +	vc4_hdmi.o \
>> +	vc4_hvs.o \
>> +	vc4_plane.o \
>> +	$()
>> +
>> +vc4-$(CONFIG_DEBUG_FS) += vc4_debugfs.o
>> +
>> +obj-$(CONFIG_DRM_VC4)  += vc4.o
>> diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
>> new file mode 100644
>> index 0000000..fee8cac
>> --- /dev/null
>> +++ b/drivers/gpu/drm/vc4/vc4_bo.c
>> @@ -0,0 +1,54 @@
>> +/*
>> + *  Copyright ? 2015 Broadcom
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +/* DOC: VC4 GEM BO management support.
>> + *
>> + * The VC4 GPU architecture (both scanout and rendering) has direct
>> + * access to system memory with no MMU in between.  To support it, we
>> + * use the GEM CMA helper functions to allocate contiguous ranges of
>> + * physical memory for our BOs.
>> + */
>
> Since you're doing kerneldoc considered pulling it all into a new vc4
> section in the drm docbook template?

I hadn't found the docbook template.  Interesting.  I'll try to cook up
some general vc4 docs for that.  I think that could be a separate
commit, though?

>> +
>> +#include "vc4_drv.h"
>> +
>> +struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
>> +{
>> +	struct drm_gem_cma_object *cma_obj;
>> +
>> +	cma_obj = drm_gem_cma_create(dev, size);
>> +	if (IS_ERR(cma_obj))
>> +		return NULL;
>> +	else
>> +		return to_vc4_bo(&cma_obj->base);
>> +}
>> +
>> +int vc4_dumb_create(struct drm_file *file_priv,
>> +		    struct drm_device *dev,
>> +		    struct drm_mode_create_dumb *args)
>> +{
>> +	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
>> +	struct vc4_bo *bo = NULL;
>> +	int ret;
>> +
>> +	if (args->pitch < min_pitch)
>> +		args->pitch = min_pitch;
>> +
>> +	if (args->size < args->pitch * args->height)
>> +		args->size = args->pitch * args->height;
>> +
>> +	mutex_lock(&dev->struct_mutex);
>> +	bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
>> +	mutex_unlock(&dev->struct_mutex);
>
> I'm on a struct_mutex crusade (trying to get rid of it in core and allow
> drivers to live without it). On a quick look there doesn't seem to be
> anything that needs struct_mutex here, so please just remove it. If there
> is indeed something vc4-internal you want to protect, please use your own
> driver-internal mutex (e.g. for drm_mm or command submission or whatever).
>
> btw the last bit in the drm core for modern drivers that needs
> struct_mutex is mmap_offset gem object lookup. I plan to replace that with
> kref_get_unless_zero trickery, which would make the core and a lot of
> drivers struct_mutex free and so relegate it mostly to a legacy role (and
> can be forgotten).

Struct mutex is here because this code is from the V3D series, with the
in-kernel BO cache ripped out (it turns out that the CMA allocator is
slow, and you can't just userspace cache since we have to do allocations
within the kernel to the tune of a couple per draw and that's too much).

I'll pull the mutex calls out for now until the cache stuff is
submitted.

>> +static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
>> +				const struct drm_display_mode *mode,
>> +				struct drm_display_mode *adjusted_mode)
>> +{
>> +	return true;
>> +}
>
> mode_fixup on crtcs is optional since 840bfe953384a and I just merged a
> patch to make it optional for encoders too (when using atomic helpers
> which you do). You can remove them both.

Great!  It felt like there was a *lot* of boilerplate when I was first
writing this stuff, and things are way better than they used to be.

>> +static int vc4_drm_load(struct drm_device *dev, unsigned long flags)
>> +{
>> +	struct vc4_dev *vc4;
>> +	int ret;
>> +
>> +	vc4 = devm_kzalloc(dev->dev, sizeof(*vc4), GFP_KERNEL);
>> +	if (!vc4)
>> +		return -ENOMEM;
>> +
>> +	dev_set_drvdata(dev->dev, dev);
>> +	vc4->dev = dev;
>> +	dev->dev_private = vc4;
>> +
>> +	drm_mode_config_init(dev);
>> +
>> +	ret = component_bind_all(dev->dev, dev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	vc4_kms_load(dev);
>> +
>> +	return 0;
>> +}
>
> ->load has backwards init ordering (we register public interfaces before
> calling it, yay) because backwards compat. Hence deprecated, please use
> drm_dev_alloc(); ... driver init including drm_dev_set_unique();
> drm_dev_register(); instead and drop ->load.

Will do.
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[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Daniel Vetter]

On Thu, Aug 13, 2015 at 01:44:03PM -0700, Eric Anholt wrote:
> Daniel Vetter <daniel@ffwll.ch> writes:
> 
> > On Wed, Aug 12, 2015 at 05:56:16PM -0700, Eric Anholt wrote:
> >> This is the start of a full VC4 driver.  Right now this just supports
> >> configuring the display using a pre-existing video mode (because
> >> changing the pixel clock isn't available yet, and doesn't work when it
> >> is).  However, this is enough for fbcon and bringing up X using
> >> xf86-video-modesetting.
> >> 
> >> Signed-off-by: Eric Anholt <eric@anholt.net>
> >> ---
> >>  drivers/gpu/drm/Kconfig           |   2 +
> >>  drivers/gpu/drm/Makefile          |   1 +
> >>  drivers/gpu/drm/vc4/Kconfig       |  14 +
> >>  drivers/gpu/drm/vc4/Makefile      |  18 ++
> >>  drivers/gpu/drm/vc4/vc4_bo.c      |  54 ++++
> >>  drivers/gpu/drm/vc4/vc4_crtc.c    | 583 ++++++++++++++++++++++++++++++++++
> >>  drivers/gpu/drm/vc4/vc4_debugfs.c |  38 +++
> >>  drivers/gpu/drm/vc4/vc4_drv.c     | 249 +++++++++++++++
> >>  drivers/gpu/drm/vc4/vc4_drv.h     | 123 +++++++
> >>  drivers/gpu/drm/vc4/vc4_hdmi.c    | 651 ++++++++++++++++++++++++++++++++++++++
> >>  drivers/gpu/drm/vc4/vc4_hvs.c     | 172 ++++++++++
> >>  drivers/gpu/drm/vc4/vc4_kms.c     |  84 +++++
> >>  drivers/gpu/drm/vc4/vc4_plane.c   | 320 +++++++++++++++++++
> >>  drivers/gpu/drm/vc4/vc4_regs.h    | 562 ++++++++++++++++++++++++++++++++
> >>  14 files changed, 2871 insertions(+)
> >>  create mode 100644 drivers/gpu/drm/vc4/Kconfig
> >>  create mode 100644 drivers/gpu/drm/vc4/Makefile
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_bo.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_crtc.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_debugfs.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.h
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_hdmi.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_hvs.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_kms.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_plane.c
> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_regs.h
> >
> > Made a quick pass and found a few things to update to latest drm
> > developments. Of course didn't look at the hardware details since no clue,
> > but looks really nice overall.
> 
> If you have anything about the hardware that you were curious about, I'd
> be interested in trying to explain them in the comments to the extent
> that I can.  It's unfortunate that we haven't shipped docs for the
> display side of things, but had to do a lot of reading of the verilog
> just to get this far, anyway.

The only thing I spotted is that you right now only register a primary and
cursor plane. I guess the plan we once discussed about exposing piles of
planes for -modesetting accel isn't there yet?

But otherwise I really didn't go into the hardware details.

> >> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> >> index c46ca31..1730a76 100644
> >> --- a/drivers/gpu/drm/Kconfig
> >> +++ b/drivers/gpu/drm/Kconfig
> >> @@ -240,3 +240,5 @@ source "drivers/gpu/drm/sti/Kconfig"
> >>  source "drivers/gpu/drm/amd/amdkfd/Kconfig"
> >>  
> >>  source "drivers/gpu/drm/imx/Kconfig"
> >> +
> >> +source "drivers/gpu/drm/vc4/Kconfig"
> >> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> >> index 5713d05..b991ac5 100644
> >> --- a/drivers/gpu/drm/Makefile
> >> +++ b/drivers/gpu/drm/Makefile
> >> @@ -42,6 +42,7 @@ obj-$(CONFIG_DRM_MGA)	+= mga/
> >>  obj-$(CONFIG_DRM_I810)	+= i810/
> >>  obj-$(CONFIG_DRM_I915)  += i915/
> >>  obj-$(CONFIG_DRM_MGAG200) += mgag200/
> >> +obj-$(CONFIG_DRM_VC4)  += vc4/
> >>  obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus/
> >>  obj-$(CONFIG_DRM_SIS)   += sis/
> >>  obj-$(CONFIG_DRM_SAVAGE)+= savage/
> >> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
> >> new file mode 100644
> >> index 0000000..130cc94
> >> --- /dev/null
> >> +++ b/drivers/gpu/drm/vc4/Kconfig
> >> @@ -0,0 +1,14 @@
> >> +config DRM_VC4
> >> +	tristate "Broadcom VC4 Graphics"
> >> +	depends on ARCH_BCM2835
> >> +	depends on DRM
> >> +	select DRM_KMS_HELPER
> >> +	select DRM_KMS_FB_HELPER
> >> +	select DRM_KMS_CMA_HELPER
> >
> > drm-misc/linux-next already has Archit's patches to enable/disable fbdev
> > in the core code, so you don't need to bother about these selects here any
> > more, it'll no-op out if drm fbdev emulation isn't enabled. Since you're
> > reusing cma fbdev helpers I don't think there's any need for other changes
> > because of this.
> 
> It sounds like I should rebase on that, then?

Yeah probably simplest. I made a pull request for drm-misc and a tag and
cc'ed you on it so you have a baseline.

> >> +	help
> >> +	  Choose this option if you have a system that has a Broadcom
> >> +	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
> >> +
> >> +	  This driver requires that "avoid_warnings=2" be present in
> >> +	  the config.txt for the firmware, to keep it from smashing
> >> +	  our display setup.
> >> diff --git a/drivers/gpu/drm/vc4/Makefile b/drivers/gpu/drm/vc4/Makefile
> >> new file mode 100644
> >> index 0000000..4aa07ca
> >> --- /dev/null
> >> +++ b/drivers/gpu/drm/vc4/Makefile
> >> @@ -0,0 +1,18 @@
> >> +ccflags-y := -Iinclude/drm
> >> +
> >> +# Please keep these build lists sorted!
> >> +
> >> +# core driver code
> >> +vc4-y := \
> >> +	vc4_bo.o \
> >> +	vc4_crtc.o \
> >> +	vc4_drv.o \
> >> +	vc4_kms.o \
> >> +	vc4_hdmi.o \
> >> +	vc4_hvs.o \
> >> +	vc4_plane.o \
> >> +	$()
> >> +
> >> +vc4-$(CONFIG_DEBUG_FS) += vc4_debugfs.o
> >> +
> >> +obj-$(CONFIG_DRM_VC4)  += vc4.o
> >> diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
> >> new file mode 100644
> >> index 0000000..fee8cac
> >> --- /dev/null
> >> +++ b/drivers/gpu/drm/vc4/vc4_bo.c
> >> @@ -0,0 +1,54 @@
> >> +/*
> >> + *  Copyright ? 2015 Broadcom
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2 as
> >> + * published by the Free Software Foundation.
> >> + */
> >> +
> >> +/* DOC: VC4 GEM BO management support.
> >> + *
> >> + * The VC4 GPU architecture (both scanout and rendering) has direct
> >> + * access to system memory with no MMU in between.  To support it, we
> >> + * use the GEM CMA helper functions to allocate contiguous ranges of
> >> + * physical memory for our BOs.
> >> + */
> >
> > Since you're doing kerneldoc considered pulling it all into a new vc4
> > section in the drm docbook template?
> 
> I hadn't found the docbook template.  Interesting.  I'll try to cook up
> some general vc4 docs for that.  I think that could be a separate
> commit, though?

Sure. Really just for yourself and other people hacking on this. btw
there's some work intel sponsors from collabora to improve kerneldoc
comments with automated hyperlinking, markdown and a few other things. But
unfortunately not yet merged.

> >> +
> >> +#include "vc4_drv.h"
> >> +
> >> +struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
> >> +{
> >> +	struct drm_gem_cma_object *cma_obj;
> >> +
> >> +	cma_obj = drm_gem_cma_create(dev, size);
> >> +	if (IS_ERR(cma_obj))
> >> +		return NULL;
> >> +	else
> >> +		return to_vc4_bo(&cma_obj->base);
> >> +}
> >> +
> >> +int vc4_dumb_create(struct drm_file *file_priv,
> >> +		    struct drm_device *dev,
> >> +		    struct drm_mode_create_dumb *args)
> >> +{
> >> +	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
> >> +	struct vc4_bo *bo = NULL;
> >> +	int ret;
> >> +
> >> +	if (args->pitch < min_pitch)
> >> +		args->pitch = min_pitch;
> >> +
> >> +	if (args->size < args->pitch * args->height)
> >> +		args->size = args->pitch * args->height;
> >> +
> >> +	mutex_lock(&dev->struct_mutex);
> >> +	bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
> >> +	mutex_unlock(&dev->struct_mutex);
> >
> > I'm on a struct_mutex crusade (trying to get rid of it in core and allow
> > drivers to live without it). On a quick look there doesn't seem to be
> > anything that needs struct_mutex here, so please just remove it. If there
> > is indeed something vc4-internal you want to protect, please use your own
> > driver-internal mutex (e.g. for drm_mm or command submission or whatever).
> >
> > btw the last bit in the drm core for modern drivers that needs
> > struct_mutex is mmap_offset gem object lookup. I plan to replace that with
> > kref_get_unless_zero trickery, which would make the core and a lot of
> > drivers struct_mutex free and so relegate it mostly to a legacy role (and
> > can be forgotten).
> 
> Struct mutex is here because this code is from the V3D series, with the
> in-kernel BO cache ripped out (it turns out that the CMA allocator is
> slow, and you can't just userspace cache since we have to do allocations
> within the kernel to the tune of a couple per draw and that's too much).
> 
> I'll pull the mutex calls out for now until the cache stuff is
> submitted.

Yeah I suspected that's for later. If feasible it'd be great if you could
rearchtect it to use a driver-private lock, just to not grow another place
using it.

> >> +static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
> >> +				const struct drm_display_mode *mode,
> >> +				struct drm_display_mode *adjusted_mode)
> >> +{
> >> +	return true;
> >> +}
> >
> > mode_fixup on crtcs is optional since 840bfe953384a and I just merged a
> > patch to make it optional for encoders too (when using atomic helpers
> > which you do). You can remove them both.
> 
> Great!  It felt like there was a *lot* of boilerplate when I was first
> writing this stuff, and things are way better than they used to be.

Just noticed that crtc->atomic_begin is optional too. btw if you spot
boilerplate somewhere else please raise it on irc, there's still a lot of
room for improvement for atomic helpers.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Eric Anholt]

Daniel Vetter <daniel@ffwll.ch> writes:

> On Thu, Aug 13, 2015 at 01:44:03PM -0700, Eric Anholt wrote:
>> Daniel Vetter <daniel@ffwll.ch> writes:
>> 
>> > On Wed, Aug 12, 2015 at 05:56:16PM -0700, Eric Anholt wrote:
>> >> This is the start of a full VC4 driver.  Right now this just supports
>> >> configuring the display using a pre-existing video mode (because
>> >> changing the pixel clock isn't available yet, and doesn't work when it
>> >> is).  However, this is enough for fbcon and bringing up X using
>> >> xf86-video-modesetting.
>> >> 
>> >> Signed-off-by: Eric Anholt <eric@anholt.net>
>> >> ---
>> >>  drivers/gpu/drm/Kconfig           |   2 +
>> >>  drivers/gpu/drm/Makefile          |   1 +
>> >>  drivers/gpu/drm/vc4/Kconfig       |  14 +
>> >>  drivers/gpu/drm/vc4/Makefile      |  18 ++
>> >>  drivers/gpu/drm/vc4/vc4_bo.c      |  54 ++++
>> >>  drivers/gpu/drm/vc4/vc4_crtc.c    | 583 ++++++++++++++++++++++++++++++++++
>> >>  drivers/gpu/drm/vc4/vc4_debugfs.c |  38 +++
>> >>  drivers/gpu/drm/vc4/vc4_drv.c     | 249 +++++++++++++++
>> >>  drivers/gpu/drm/vc4/vc4_drv.h     | 123 +++++++
>> >>  drivers/gpu/drm/vc4/vc4_hdmi.c    | 651 ++++++++++++++++++++++++++++++++++++++
>> >>  drivers/gpu/drm/vc4/vc4_hvs.c     | 172 ++++++++++
>> >>  drivers/gpu/drm/vc4/vc4_kms.c     |  84 +++++
>> >>  drivers/gpu/drm/vc4/vc4_plane.c   | 320 +++++++++++++++++++
>> >>  drivers/gpu/drm/vc4/vc4_regs.h    | 562 ++++++++++++++++++++++++++++++++
>> >>  14 files changed, 2871 insertions(+)
>> >>  create mode 100644 drivers/gpu/drm/vc4/Kconfig
>> >>  create mode 100644 drivers/gpu/drm/vc4/Makefile
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_bo.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_crtc.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_debugfs.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_drv.h
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_hdmi.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_hvs.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_kms.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_plane.c
>> >>  create mode 100644 drivers/gpu/drm/vc4/vc4_regs.h
>> >
>> > Made a quick pass and found a few things to update to latest drm
>> > developments. Of course didn't look at the hardware details since no clue,
>> > but looks really nice overall.
>> 
>> If you have anything about the hardware that you were curious about, I'd
>> be interested in trying to explain them in the comments to the extent
>> that I can.  It's unfortunate that we haven't shipped docs for the
>> display side of things, but had to do a lot of reading of the verilog
>> just to get this far, anyway.
>
> The only thing I spotted is that you right now only register a primary and
> cursor plane. I guess the plan we once discussed about exposing piles of
> planes for -modesetting accel isn't there yet?
>
> But otherwise I really didn't go into the hardware details.

Yeah, I haven't done piles of planes because what we have right now
means I don't have to do the bandwidth limits tracking yet.
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[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Russell King - ARM Linux]

On Thu, Aug 13, 2015 at 01:44:03PM -0700, Eric Anholt wrote:
> Struct mutex is here because this code is from the V3D series, with the
> in-kernel BO cache ripped out (it turns out that the CMA allocator is
> slow, and you can't just userspace cache since we have to do allocations
> within the kernel to the tune of a couple per draw and that's too much).

The CMA allocator is fast until you have pinned pages in its region,
where it becomes _very_ slow to do allocations, sometimes getting up
to the order of seconds.

The main culpret of this are GFP_HIGHUSER_MOVABLE allocations which
then pin the page.  It doesn't take many of those to make CMA really
inefficient.

The problem is that CMA doesn't get any information back from the
internal page migration about which pages couldn't be moved, so it
dumbly just tries incrementing the allocation by one page (subject
to alignment constraints) and retrying again - repeating over the
entire CMA region.  The bigger the region, the more time this takes.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Eric Anholt]

Russell King - ARM Linux <linux@arm.linux.org.uk> writes:

> On Thu, Aug 13, 2015 at 01:44:03PM -0700, Eric Anholt wrote:
>> Struct mutex is here because this code is from the V3D series, with the
>> in-kernel BO cache ripped out (it turns out that the CMA allocator is
>> slow, and you can't just userspace cache since we have to do allocations
>> within the kernel to the tune of a couple per draw and that's too much).
>
> The CMA allocator is fast until you have pinned pages in its region,
> where it becomes _very_ slow to do allocations, sometimes getting up
> to the order of seconds.
>
> The main culpret of this are GFP_HIGHUSER_MOVABLE allocations which
> then pin the page.  It doesn't take many of those to make CMA really
> inefficient.
>
> The problem is that CMA doesn't get any information back from the
> internal page migration about which pages couldn't be moved, so it
> dumbly just tries incrementing the allocation by one page (subject
> to alignment constraints) and retrying again - repeating over the
> entire CMA region.  The bigger the region, the more time this takes.

Ouch.

Since I can workaround the allocation cost, the main problem I have
right now is that I've got a set of small allocations for 3D that all
need to have the same high 4 bits of paddr, because someone cleverly
packed some address bits in a GPU-managed structure.  Any
recommendations for ways to handle this with CMA?
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[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Emil Velikov]

On 13 August 2015 at 01:56, Eric Anholt <eric@anholt.net> wrote:
> This is the start of a full VC4 driver.  Right now this just supports
> configuring the display using a pre-existing video mode (because
> changing the pixel clock isn't available yet, and doesn't work when it
> is).  However, this is enough for fbcon and bringing up X using
> xf86-video-modesetting.
>
> Signed-off-by: Eric Anholt <eric@anholt.net>
...
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/Makefile
> @@ -0,0 +1,18 @@
> +ccflags-y := -Iinclude/drm
> +
> +# Please keep these build lists sorted!
> +
> +# core driver code
> +vc4-y := \
> +       vc4_bo.o \
> +       vc4_crtc.o \
> +       vc4_drv.o \
> +       vc4_kms.o \
> +       vc4_hdmi.o \
> +       vc4_hvs.o \
> +       vc4_plane.o \
> +       $()
> +
In case anyone is curious - this is the first sentinel in the whole
kernel (some 2000+ Makefiles) :-)

-Emil

[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Stephen Warren]

On 08/12/2015 06:56 PM, Eric Anholt wrote:
> This is the start of a full VC4 driver.  Right now this just supports
> configuring the display using a pre-existing video mode (because
> changing the pixel clock isn't available yet, and doesn't work when it
> is).  However, this is enough for fbcon and bringing up X using
> xf86-video-modesetting.

> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig

> +config DRM_VC4
> +	tristate "Broadcom VC4 Graphics"

> +	help
> +	  Choose this option if you have a system that has a Broadcom
> +	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
> +
> +	  This driver requires that "avoid_warnings=2" be present in
> +	  the config.txt for the firmware, to keep it from smashing
> +	  our display setup.

The need for "avoid_warnings=2" seems like it will trip people up. I
don't think it's in any config.txt I've seen. Can you expand more on that?

[PATCH 3/7] drm/vc4: Add KMS support for Raspberry Pi.

[Eric Anholt]

r<#secure method=pgpmime mode=sign>
Stephen Warren <swarren@wwwdotorg.org> writes:

> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>> This is the start of a full VC4 driver.  Right now this just supports
>> configuring the display using a pre-existing video mode (because
>> changing the pixel clock isn't available yet, and doesn't work when it
>> is).  However, this is enough for fbcon and bringing up X using
>> xf86-video-modesetting.
>
>> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
>
>> +config DRM_VC4
>> +	tristate "Broadcom VC4 Graphics"
>
>> +	help
>> +	  Choose this option if you have a system that has a Broadcom
>> +	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
>> +
>> +	  This driver requires that "avoid_warnings=2" be present in
>> +	  the config.txt for the firmware, to keep it from smashing
>> +	  our display setup.
>
> The need for "avoid_warnings=2" seems like it will trip people up. I
> don't think it's in any config.txt I've seen. Can you expand more on that?

The warnings thing is the firmware watching for undervoltage and then it
calls into dispmanx to overlay a little rainbow box on the screen.  This
of course interferes with our display setup.

I think we'll be able to wire up notifications to Linux for
undervoltage, at which point we can do something useful with that
information, ourselves.

[PATCH 4/7] drm/vc4: Use the fbdev_cma helpers

[Eric Anholt]

From: Derek Foreman <derekf@osg.samsung.com>

Keep the fbdev_cma pointer around so we can use it on hotplog and close
to ensure the frame buffer console is in a useful state.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/gpu/drm/vc4/vc4_drv.c | 15 +++++++++++++++
 drivers/gpu/drm/vc4/vc4_drv.h |  2 ++
 drivers/gpu/drm/vc4/vc4_kms.c | 18 +++++++++++++++---
 3 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 9ecf4b8b..90414d1 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include "drm_fb_cma_helper.h"
 
 #include "vc4_drv.h"
 #include "vc4_regs.h"
@@ -70,6 +71,11 @@ static int vc4_drm_load(struct drm_device *dev, unsigned long flags)
 
 static int vc4_drm_unload(struct drm_device *dev)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->fbdev)
+		drm_fbdev_cma_fini(vc4->fbdev);
+
 	drm_mode_config_cleanup(dev);
 
 	component_unbind_all(dev->dev, dev);
@@ -85,6 +91,14 @@ static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file)
 		vc4_cancel_page_flip(crtc, file);
 }
 
+static void vc4_lastclose(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->fbdev)
+		drm_fbdev_cma_restore_mode(vc4->fbdev);
+}
+
 static const struct file_operations vc4_drm_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
@@ -109,6 +123,7 @@ static struct drm_driver vc4_drm_driver = {
 			    DRIVER_PRIME),
 	.load = vc4_drm_load,
 	.unload = vc4_drm_unload,
+	.lastclose = vc4_lastclose,
 	.set_busid = drm_platform_set_busid,
 	.preclose = vc4_drm_preclose,
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 1b0a0b0..6edc14b 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -15,6 +15,8 @@ struct vc4_dev {
 	struct vc4_hdmi *hdmi;
 	struct vc4_hvs *hvs;
 	struct vc4_crtc *crtc[3];
+
+	struct drm_fbdev_cma *fbdev;
 };
 
 static inline struct vc4_dev *
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index e5e96bc..a34439f 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -21,7 +21,16 @@
 #include "drm_fb_cma_helper.h"
 #include "vc4_drv.h"
 
+static void vc4_output_poll_changed(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->fbdev)
+		drm_fbdev_cma_hotplug_event(vc4->fbdev);
+}
+
 static const struct drm_mode_config_funcs vc4_mode_funcs = {
+	.output_poll_changed = vc4_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 	.fb_create = drm_fb_cma_create,
@@ -54,6 +63,7 @@ fail:
 
 int vc4_kms_load(struct drm_device *dev)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	int ret;
 
 	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
@@ -73,9 +83,11 @@ int vc4_kms_load(struct drm_device *dev)
 
 	drm_mode_config_reset(dev);
 
-	drm_fbdev_cma_init(dev, 32,
-			   dev->mode_config.num_crtc,
-			   dev->mode_config.num_connector);
+	vc4->fbdev = drm_fbdev_cma_init(dev, 32,
+					dev->mode_config.num_crtc,
+					dev->mode_config.num_connector);
+	if (IS_ERR(vc4->fbdev))
+		vc4->fbdev = NULL;
 
 	drm_kms_helper_poll_init(dev);
 
-- 
2.1.4

[PATCH 5/7] drm/vc4: Allow vblank to be disabled

[Eric Anholt]

From: Derek Foreman <derekf@osg.samsung.com>

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/gpu/drm/vc4/vc4_kms.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index a34439f..f881cd4 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -77,6 +77,8 @@ int vc4_kms_load(struct drm_device *dev)
 	dev->mode_config.funcs = &vc4_mode_funcs;
 	dev->mode_config.preferred_depth = 24;
 
+	dev->vblank_disable_allowed = true;
+
 	ret = vc4_init_modeset_objects(dev);
 	if (ret)
 		goto fail;
-- 
2.1.4

[PATCH 6/7] ARM: bcm2835: Add the DDC I2C controller to the device tree.

[Eric Anholt]

We need to use it for getting video modes over HDMI.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 arch/arm/boot/dts/bcm2835.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 301c73f..8f3ba88 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -149,6 +149,15 @@
 			status = "disabled";
 		};
 
+		i2c2: i2c at 7e805000 {
+			compatible = "brcm,bcm2835-i2c";
+			reg = <0x7e805000 0x1000>;
+			interrupts = <2 21>;
+			clocks = <&clk_i2c>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
 		usb at 7e980000 {
 			compatible = "brcm,bcm2835-usb";
 			reg = <0x7e980000 0x10000>;
-- 
2.1.4

[PATCH 6/7] ARM: bcm2835: Add the DDC I2C controller to the device tree.

[Stephen Warren]

On 08/12/2015 06:56 PM, Eric Anholt wrote:
> We need to use it for getting video modes over HDMI.

> diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi

> +		i2c2: i2c at 7e805000 {
> +			compatible = "brcm,bcm2835-i2c";
> +			reg = <0x7e805000 0x1000>;
> +			interrupts = <2 21>;
> +			clocks = <&clk_i2c>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +		};

In an SoC .dtsi file, you'd typically write:

	status = "disabled";

... in all nodes that represent IO controllers that interface to
external HW, so that board DT files can/must explicitly choose to enable
the device if it's actually in use on the board. Some systems might not
have HDMI and hence might not hook up the HDMI_SCL/SDA pads.

BCM2835-ARM-Peripherals.pdf states "Note that the BSC2 master is used
dedicated with the HDMI interface and should not be accessed by user
programs.". Does this imply the Linux kernel shouldn't be touching this
I2C controller; that the VC4 firmware might also be attempting to use
it? I wonder how any such sharing of the HW would work.

[PATCH 6/7] ARM: bcm2835: Add the DDC I2C controller to the device tree.

[Eric Anholt]

Stephen Warren <swarren@wwwdotorg.org> writes:

> On 08/12/2015 06:56 PM, Eric Anholt wrote:
>> We need to use it for getting video modes over HDMI.
>
>> diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
>
>> +		i2c2: i2c at 7e805000 {
>> +			compatible = "brcm,bcm2835-i2c";
>> +			reg = <0x7e805000 0x1000>;
>> +			interrupts = <2 21>;
>> +			clocks = <&clk_i2c>;
>> +			#address-cells = <1>;
>> +			#size-cells = <0>;
>> +		};
>
> In an SoC .dtsi file, you'd typically write:
>
> 	status = "disabled";
>
> ... in all nodes that represent IO controllers that interface to
> external HW, so that board DT files can/must explicitly choose to enable
> the device if it's actually in use on the board. Some systems might not
> have HDMI and hence might not hook up the HDMI_SCL/SDA pads.
>
> BCM2835-ARM-Peripherals.pdf states "Note that the BSC2 master is used
> dedicated with the HDMI interface and should not be accessed by user
> programs.". Does this imply the Linux kernel shouldn't be touching this
> I2C controller; that the VC4 firmware might also be attempting to use
> it? I wonder how any such sharing of the HW would work.

In order for *any* of this driver to work, we need to ensure that the
firmware doesn't try to write to the corresponding part of the hardware.
DDC I2C is no different.  All that will cause the firmware to do
anything with display is generating mbox/dispmanx requests (through the
firmware driver), and the undervoltage warnings.
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[PATCH 7/7] ARM: bcm2835: Add VC4 to the device tree.

[Eric Anholt]

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 arch/arm/boot/dts/bcm2835.dtsi | 43 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 8f3ba88..dda67aa 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -1,4 +1,5 @@
 #include <dt-bindings/pinctrl/bcm2835.h>
+#include <dt-bindings/gpio/gpio.h>
 #include "skeleton.dtsi"
 
 / {
@@ -167,6 +168,48 @@
 		arm-pmu {
 			compatible = "arm,arm1176-pmu";
 		};
+
+		hdmi: brcm,vc4-hdmi at 7e902000 {
+			compatible = "brcm,vc4-hdmi";
+			reg = <0x7e902000 0x600>,
+			      <0x7e808000 0x100>;
+			interrupts = <2 8>, <2 9>;
+			ddc = <&i2c2>;
+			hpd-gpio = <&gpio 46 GPIO_ACTIVE_HIGH>;
+			crtc = <&pv2>;
+		};
+
+		pv0: brcm,vc4-pixelvalve at 7e206000 {
+			compatible = "brcm,vc4-pixelvalve";
+			reg = <0x7e206000 0x100>;
+			interrupts = <2 13>; /* pwa2 */
+		};
+
+		pv1: brcm,vc4-pixelvalve at 7e207000 {
+			compatible = "brcm,vc4-pixelvalve";
+			reg = <0x7e207000 0x100>;
+			interrupts = <2 14>; /* pwa1 */
+		};
+
+		pv2: brcm,vc4-pixelvalve at 7e807000 {
+			compatible = "brcm,vc4-pixelvalve";
+			reg = <0x7e807000 0x100>;
+			interrupts = <2 10>; /* pixelvalve */
+		};
+
+		hvs: brcm,hvs at 7e400000 {
+			compatible = "brcm,vc4-hvs";
+			reg = <0x7e400000 0x6000>;
+			interrupts = <2 1>;
+		};
+
+		vc4: vc4 at 0x7e4c0000 {
+			compatible = "brcm,vc4";
+
+			crtcs = <&pv0>, <&pv1>, <&pv2>;
+			encoders = <&hdmi>;
+			hvss = <&hvs>;
+		};
 	};
 
 	clocks {
-- 
2.1.4

[PATCH 7/7] ARM: bcm2835: Add VC4 to the device tree.

[Stephen Warren]

On 08/12/2015 06:56 PM, Eric Anholt wrote:
> Signed-off-by: Eric Anholt <eric@anholt.net>

Patch description?


> diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi

>  		arm-pmu {
>  			compatible = "arm,arm1176-pmu";
>  		};
> +
> +		hdmi: brcm,vc4-hdmi at 7e902000 {

It'd be nice to keep all the DT nodes with a reg property together, and
sorted in reg order.

As before, I think any DT node for a HW block that may-or-may-not-be
used based on board connectivity/features should be disabled in the SoC
.dtsi file, and enabled in the board's DT file if the feature is useful
for that board.