* Re: tty, vt: lockdep warnings (Patch v3)
From: Sasha Levin @ 2012-11-13 16:24 UTC (permalink / raw)
To: Sasha Levin
Cc: Hugh Dickins, Alan Cox, Bjørn Mork, Dave Jones,
Daniel Vetter, Greg Kroah-Hartman, Jiri Slaby, linux-kernel,
linux-fbdev, florianSchandinat
In-Reply-To: <509D5C97.2020801@oracle.com>
On Fri, Nov 9, 2012 at 2:42 PM, Sasha Levin <sasha.levin@oracle.com> wrote:
> On 11/09/2012 02:34 PM, Hugh Dickins wrote:
>> On Thu, 8 Nov 2012, Alan Cox wrote:
>>> commit f35b3fbf24c4e4debb6a7a864b09854ccc2a22e7
>>> Author: Alan Cox <alan@linux.intel.com>
>>> Date: Wed Nov 7 16:35:08 2012 +0000
>>>
>>> fb: Rework locking to fix lock ordering on takeover
>>>
>>> Adjust the console layer to allow a take over call where the caller already
>>> holds the locks. Make the fb layer lock in order.
>>>
>>> This s partly a band aid, the fb layer is terminally confused about the
>>> locking rules it uses for its notifiers it seems.
>>>
>>> Signed-off-by: Alan Cox <alan@linux.intel.com>
>>
>> This version works for me too - thanks.
>> Hugh
>
> I was planning to test it last night, but new code in mm/ failed horribly and
> was BUG()ing all over the place, so I didn't get any significant testing
> of this patch done.
>
> Will update...
Nothing complains anywhere, looks great.
Thanks,
Sasha
^ permalink raw reply
* Re: [PATCH v8 6/6] drm_modes: add of_videomode helpers
From: Steffen Trumtrar @ 2012-11-13 13:30 UTC (permalink / raw)
To: Thierry Reding
Cc: devicetree-discuss, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Guennady Liakhovetski, linux-media,
Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <20121113113518.GE30049@avionic-0098.mockup.avionic-design.de>
On Tue, Nov 13, 2012 at 12:35:18PM +0100, Thierry Reding wrote:
> On Mon, Nov 12, 2012 at 04:37:06PM +0100, Steffen Trumtrar wrote:
> [...]
> > +#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
> > +static void dump_drm_displaymode(struct drm_display_mode *m)
> > +{
> > + pr_debug("drm_displaymode = %d %d %d %d %d %d %d %d %d\n",
> > + m->hdisplay, m->hsync_start, m->hsync_end, m->htotal,
> > + m->vdisplay, m->vsync_start, m->vsync_end, m->vtotal,
> > + m->clock);
>
> I seem to remember a comment to an earlier version of this patch
> requesting better formatting of this string. Alternatively you might
> want to consider replacing it using drm_mode_debug_printmodeline().
>
Ah, yes. I only did that for fb_videomode and forgot about this one.
But the existing function is even better.
> > diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> [...]
> > @@ -1457,6 +1458,10 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev,
> >
> > extern int videomode_to_display_mode(struct videomode *vm,
> > struct drm_display_mode *dmode);
> > +extern int of_get_drm_display_mode(struct device_node *np,
> > + struct drm_display_mode *dmode,
> > + int index);
>
> Also requires either a dummy or protection.
>
> Thierry
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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^ permalink raw reply
* Re: [PATCH v8 3/6] fbmon: add videomode helpers
From: Steffen Trumtrar @ 2012-11-13 13:28 UTC (permalink / raw)
To: Thierry Reding
Cc: linux-fbdev, devicetree-discuss, dri-devel, Tomi Valkeinen,
Laurent Pinchart, kernel, Guennady Liakhovetski, linux-media
In-Reply-To: <20121113112257.GB30049@avionic-0098.mockup.avionic-design.de>
On Tue, Nov 13, 2012 at 12:22:58PM +0100, Thierry Reding wrote:
> On Mon, Nov 12, 2012 at 04:37:03PM +0100, Steffen Trumtrar wrote:
> [...]
> > +#if IS_ENABLED(CONFIG_VIDEOMODE)
> > +int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode)
>
> The other helpers are named <destination-type>_from_<source-type>(),
> maybe this should follow that example for consistency?
>
Hm, not a bad idea.
> > +{
> > + fbmode->xres = vm->hactive;
> > + fbmode->left_margin = vm->hback_porch;
> > + fbmode->right_margin = vm->hfront_porch;
> > + fbmode->hsync_len = vm->hsync_len;
> > +
> > + fbmode->yres = vm->vactive;
> > + fbmode->upper_margin = vm->vback_porch;
> > + fbmode->lower_margin = vm->vfront_porch;
> > + fbmode->vsync_len = vm->vsync_len;
> > +
> > + fbmode->pixclock = KHZ2PICOS(vm->pixelclock / 1000);
> > +
> > + fbmode->sync = 0;
> > + fbmode->vmode = 0;
> > + if (vm->hah)
> > + fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
> > + if (vm->vah)
> > + fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
> > + if (vm->interlaced)
> > + fbmode->vmode |= FB_VMODE_INTERLACED;
> > + if (vm->doublescan)
> > + fbmode->vmode |= FB_VMODE_DOUBLE;
> > + if (vm->de)
> > + fbmode->sync |= FB_SYNC_DATA_ENABLE_HIGH_ACT;
> > + fbmode->refresh = 60;
>
> Can the refresh rate not be computed from the pixel clock and the
> horizontal and vertical timings?
>
Yes. That totally got lost on the way.
> > + fbmode->flag = 0;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(videomode_to_fb_videomode);
> > +#endif
> > +
> > +
>
> There's a gratuitous blank line here.
>
> > #else
> > int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
> > {
> > diff --git a/include/linux/fb.h b/include/linux/fb.h
> > index c7a9571..46c665b 100644
> > --- a/include/linux/fb.h
> > +++ b/include/linux/fb.h
> > @@ -714,6 +714,8 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
> > extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
> > extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
> >
> > +extern int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode);
> > +
>
> Should you provide a dummy in the !CONFIG_VIDEOMODE case?
>
Okay
Steffen
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply
* Re: [PATCH v8 1/6] video: add display_timing and videomode
From: Steffen Trumtrar @ 2012-11-13 13:14 UTC (permalink / raw)
To: Thierry Reding
Cc: linux-fbdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW, Tomi Valkeinen,
Laurent Pinchart, kernel-bIcnvbaLZ9MEGnE8C9+IrQ,
Guennady Liakhovetski, linux-media-u79uwXL29TY76Z2rM5mHXA
In-Reply-To: <20121113104159.GA18645-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
On Tue, Nov 13, 2012 at 11:41:59AM +0100, Thierry Reding wrote:
> On Mon, Nov 12, 2012 at 04:37:01PM +0100, Steffen Trumtrar wrote:
> [...]
> > diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> > index d08d799..2a23b18 100644
> > --- a/drivers/video/Kconfig
> > +++ b/drivers/video/Kconfig
> > @@ -33,6 +33,12 @@ config VIDEO_OUTPUT_CONTROL
> > This framework adds support for low-level control of the video
> > output switch.
> >
> > +config DISPLAY_TIMING
>
> DISPLAY_TIMINGS?
>
> > #video output switch sysfs driver
> > obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
> > +obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
>
> display_timings.o?
>
> > +obj-$(CONFIG_VIDEOMODE) += videomode.o
> > diff --git a/drivers/video/display_timing.c b/drivers/video/display_timing.c
>
> display_timings.c?
>
I originally had that and changed it by request to the singular form.
(Can't find the mail atm). And I think this fits better with all the other drivers.
> > +int videomode_from_timing(struct display_timings *disp, struct videomode *vm,
> > + unsigned int index)
>
> I find the indexing API a bit confusing. But that's perhaps just a
> matter of personal preference.
>
> Also the ordering of arguments seems a little off. I find it more
> natural to have the destination pointer in the first argument, similar
> to the memcpy() function, so this would be:
>
> int videomode_from_timing(struct videomode *vm, struct display_timings *disp,
> unsigned int index);
>
> Actually, when reading videomode_from_timing() I'd expect the argument
> list to be:
>
> int videomode_from_timing(struct videomode *vm, struct display_timing *timing);
>
> Am I the only one confused by this?
>
I went with the of_xxx-functions that have fname(from_node, to_property)
and personally prefer it this way. Therefore I'd like to keep it as is.
> > diff --git a/include/linux/display_timing.h b/include/linux/display_timing.h
>
> display_timings.h?
>
> > +/* placeholder function until ranges are really needed
>
> The above line has trailing whitespace. Also the block comment should
> have the opening /* on a separate line.
>
Okay.
> > + * the index parameter should then be used to select one of [min typ max]
>
> If index is supposed to select min, typ or max, then maybe an enum would
> be a better candidate? Or alternatively provide separate accessors, like
> display_timing_get_{minimum,typical,maximum}().
>
Hm, I'm not so sure about this one. I'd prefer the enum.
> > + */
> > +static inline u32 display_timing_get_value(struct timing_entry *te,
> > + unsigned int index)
> > +{
> > + return te->typ;
> > +}
> > +
> > +static inline struct display_timing *display_timings_get(struct display_timings *disp,
> > + unsigned int index)
> > +{
> > + if (disp->num_timings > index)
> > + return disp->timings[index];
> > + else
> > + return NULL;
> > +}
> > +
> > +void timings_release(struct display_timings *disp);
>
> This function no longer exists.
>
Right.
Steffen
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Steffen Trumtrar @ 2012-11-13 12:59 UTC (permalink / raw)
To: Stephen Warren
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen, kernel
In-Reply-To: <50A15EAC.9030608@wwwdotorg.org>
On Mon, Nov 12, 2012 at 01:40:12PM -0700, Stephen Warren wrote:
> On 11/12/2012 08:37 AM, Steffen Trumtrar wrote:
> > This adds support for reading display timings from DT or/and convert one of those
> > timings to a videomode.
> > The of_display_timing implementation supports multiple children where each
> > property can have up to 3 values. All children are read into an array, that
> > can be queried.
> > of_get_videomode converts exactly one of that timings to a struct videomode.
>
> > diff --git a/Documentation/devicetree/bindings/video/display-timings.txt b/Documentation/devicetree/bindings/video/display-timings.txt
>
> The device tree bindings look reasonable to me, so,
>
> Acked-by: Stephen Warren <swarren@nvidia.com>
>
>
Thanks,
Steffen
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply
* Re: [PATCH v8 6/6] drm_modes: add of_videomode helpers
From: Thierry Reding @ 2012-11-13 11:35 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Guennady Liakhovetski, linux-media,
Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-7-git-send-email-s.trumtrar@pengutronix.de>
[-- Attachment #1: Type: text/plain, Size: 1046 bytes --]
On Mon, Nov 12, 2012 at 04:37:06PM +0100, Steffen Trumtrar wrote:
[...]
> +#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
> +static void dump_drm_displaymode(struct drm_display_mode *m)
> +{
> + pr_debug("drm_displaymode = %d %d %d %d %d %d %d %d %d\n",
> + m->hdisplay, m->hsync_start, m->hsync_end, m->htotal,
> + m->vdisplay, m->vsync_start, m->vsync_end, m->vtotal,
> + m->clock);
I seem to remember a comment to an earlier version of this patch
requesting better formatting of this string. Alternatively you might
want to consider replacing it using drm_mode_debug_printmodeline().
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
[...]
> @@ -1457,6 +1458,10 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev,
>
> extern int videomode_to_display_mode(struct videomode *vm,
> struct drm_display_mode *dmode);
> +extern int of_get_drm_display_mode(struct device_node *np,
> + struct drm_display_mode *dmode,
> + int index);
Also requires either a dummy or protection.
Thierry
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^ permalink raw reply
* Re: [PATCH v8 5/6] drm_modes: add videomode helpers
From: Thierry Reding @ 2012-11-13 11:31 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: linux-fbdev, Stephen Warren, devicetree-discuss, dri-devel,
Tomi Valkeinen, Rob Herring, Laurent Pinchart, kernel,
Guennady Liakhovetski, linux-media
In-Reply-To: <1352734626-27412-6-git-send-email-s.trumtrar@pengutronix.de>
[-- Attachment #1: Type: text/plain, Size: 580 bytes --]
On Mon, Nov 12, 2012 at 04:37:05PM +0100, Steffen Trumtrar wrote:
[...]
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
[...]
> +#if IS_ENABLED(CONFIG_VIDEOMODE)
> +int videomode_to_display_mode(struct videomode *vm, struct drm_display_mode *dmode)
This one as well may be more consistently named
drm_display_mode_from_videomode().
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
[...]
> +extern int videomode_to_display_mode(struct videomode *vm,
> + struct drm_display_mode *dmode);
And this also needs protection or a dummy.
Thierry
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^ permalink raw reply
* Re: [PATCH v8 4/6] fbmon: add of_videomode helpers
From: Thierry Reding @ 2012-11-13 11:28 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Guennady Liakhovetski, linux-media,
Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-5-git-send-email-s.trumtrar@pengutronix.de>
[-- Attachment #1: Type: text/plain, Size: 396 bytes --]
On Mon, Nov 12, 2012 at 04:37:04PM +0100, Steffen Trumtrar wrote:
[...]
> diff --git a/include/linux/fb.h b/include/linux/fb.h
[...]
> +extern int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, int index);
Similarily this should get a dummy for the !CONFIG_OF_VIDEOMODE case,
right? Either that or the prototype should be protected by
CONFIG_OF_VIDEOMODE as well.
Thierry
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^ permalink raw reply
* Re: [PATCH v8 3/6] fbmon: add videomode helpers
From: Thierry Reding @ 2012-11-13 11:22 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Guennady Liakhovetski, linux-media,
Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-4-git-send-email-s.trumtrar@pengutronix.de>
[-- Attachment #1: Type: text/plain, Size: 2044 bytes --]
On Mon, Nov 12, 2012 at 04:37:03PM +0100, Steffen Trumtrar wrote:
[...]
> +#if IS_ENABLED(CONFIG_VIDEOMODE)
> +int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode)
The other helpers are named <destination-type>_from_<source-type>(),
maybe this should follow that example for consistency?
> +{
> + fbmode->xres = vm->hactive;
> + fbmode->left_margin = vm->hback_porch;
> + fbmode->right_margin = vm->hfront_porch;
> + fbmode->hsync_len = vm->hsync_len;
> +
> + fbmode->yres = vm->vactive;
> + fbmode->upper_margin = vm->vback_porch;
> + fbmode->lower_margin = vm->vfront_porch;
> + fbmode->vsync_len = vm->vsync_len;
> +
> + fbmode->pixclock = KHZ2PICOS(vm->pixelclock / 1000);
> +
> + fbmode->sync = 0;
> + fbmode->vmode = 0;
> + if (vm->hah)
> + fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
> + if (vm->vah)
> + fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
> + if (vm->interlaced)
> + fbmode->vmode |= FB_VMODE_INTERLACED;
> + if (vm->doublescan)
> + fbmode->vmode |= FB_VMODE_DOUBLE;
> + if (vm->de)
> + fbmode->sync |= FB_SYNC_DATA_ENABLE_HIGH_ACT;
> + fbmode->refresh = 60;
Can the refresh rate not be computed from the pixel clock and the
horizontal and vertical timings?
> + fbmode->flag = 0;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(videomode_to_fb_videomode);
> +#endif
> +
> +
There's a gratuitous blank line here.
> #else
> int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
> {
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index c7a9571..46c665b 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -714,6 +714,8 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
> extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
> extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
>
> +extern int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode);
> +
Should you provide a dummy in the !CONFIG_VIDEOMODE case?
Thierry
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^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Thierry Reding @ 2012-11-13 11:08 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Guennady Liakhovetski, linux-media,
Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-3-git-send-email-s.trumtrar@pengutronix.de>
[-- Attachment #1: Type: text/plain, Size: 5800 bytes --]
On Mon, Nov 12, 2012 at 04:37:02PM +0100, Steffen Trumtrar wrote:
> This adds support for reading display timings from DT or/and convert one of those
> timings to a videomode.
> The of_display_timing implementation supports multiple children where each
> property can have up to 3 values. All children are read into an array, that
> can be queried.
> of_get_videomode converts exactly one of that timings to a struct videomode.
>
> Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
> .../devicetree/bindings/video/display-timings.txt | 107 +++++++++++
> drivers/video/Kconfig | 13 ++
> drivers/video/Makefile | 2 +
> drivers/video/of_display_timing.c | 186 ++++++++++++++++++++
> drivers/video/of_videomode.c | 47 +++++
> include/linux/of_display_timings.h | 19 ++
> include/linux/of_videomode.h | 15 ++
> 7 files changed, 389 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/video/display-timings.txt
> create mode 100644 drivers/video/of_display_timing.c
> create mode 100644 drivers/video/of_videomode.c
> create mode 100644 include/linux/of_display_timings.h
> create mode 100644 include/linux/of_videomode.h
>
> diff --git a/Documentation/devicetree/bindings/video/display-timings.txt b/Documentation/devicetree/bindings/video/display-timings.txt
> new file mode 100644
> index 0000000..e22e2fd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/video/display-timings.txt
> @@ -0,0 +1,107 @@
> +display-timings bindings
> +========================
> +
> +display-timings-node
> +--------------------
Maybe leave away the last -, so that it reads "display-timings node"? I
think that makes it more obvious that the node is supposed to be called
"display-timings".
> +
> +required properties:
> + - none
> +
> +optional properties:
> + - native-mode: the native mode for the display, in case multiple modes are
> + provided. When omitted, assume the first node is the native.
> +
> +timings-subnode
> +---------------
Same here: "timing subnodes"?
> +
> +required properties:
> + - hactive, vactive: Display resolution
> + - hfront-porch, hback-porch, hsync-len: Horizontal Display timing parameters
"display"?
> + in pixels
> + vfront-porch, vback-porch, vsync-len: Vertical display timing parameters in
> + lines
> + - clock-frequency: displayclock in Hz
"display clock"?
> +
> +optional properties:
> + - hsync-active : Hsync pulse is active low/high/ignored
> + - vsync-active : Vsync pulse is active low/high/ignored
> + - de-active : Data-Enable pulse is active low/high/ignored
> + - pixelclk-inverted : pixelclock is inverted/non-inverted/ignored
> + - interlaced (bool)
> + - doublescan (bool)
> +
> +All the optional properties that are not bool follow the following logic:
> + <1> : high active
> + <0> : low active
> + omitted : not used on hardware
Nitpick: You use space before : in the optional properties, but not in
the required properties above.
> +
> +There are different ways of describing the capabilities of a display. The devicetree
> +representation corresponds to the one commonly found in datasheets for displays.
> +If a display supports multiple signal timings, the native-mode can be specified.
> +
> +The parameters are defined as
> +
> +struct display_timing
> +=====================
struct display_timing has no meaning in device tree documentation. Maybe
this line can just go away?
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index 2a23b18..a324457 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -39,6 +39,19 @@ config DISPLAY_TIMING
> config VIDEOMODE
> bool
>
> +config OF_DISPLAY_TIMING
OF_DISPLAY_TIMINGS?
> diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
of_display_timings.c?
> +/**
> + * of_get_display_timings - parse all display_timing entries from a device_node
> + * @np: device_node with the subnodes
> + **/
> +struct display_timings *of_get_display_timings(struct device_node *np)
[...]
> + for_each_child_of_node(timings_np, entry) {
> + struct display_timing *dt;
> +
> + dt = of_get_display_timing(entry);
> + if (!dt) {
> + /* to not encourage wrong devicetrees, fail in case of an error */
> + pr_err("%s: error in timing %d\n", __func__, disp->num_timings+1);
> + return NULL;
> + }
In case of a parsing error, of_get_display_timing() already shows an
error message, so I don't think we need another one here.
> +/**
> + * of_display_timings_exists - check if a display-timings node is provided
> + * @np: device_node with the timing
> + **/
> +int of_display_timings_exists(struct device_node *np)
> +{
> + struct device_node *timings_np;
> +
> + if (!np)
> + return -EINVAL;
> +
> + timings_np = of_parse_phandle(np, "display-timings", 0);
> + if (!timings_np)
> + return -EINVAL;
> +
> + return 1;
I think this is missing of_node_put(timings_np) in both failure and
success cases. Also, maybe this should really return a bool instead?
Also, why do you use of_parse_phandle() for this? Aren't the
display-timings nodes expected to be children of some other node like an
output/display device?
> diff --git a/include/linux/of_videomode.h b/include/linux/of_videomode.h
[...]
> +
> +int of_get_videomode(struct device_node *np, struct videomode *vm, int index);
> +#endif /* __LINUX_OF_VIDEOMODE_H */
There should be a blank line between the last two lines I think.
Thierry
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^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Steffen Trumtrar @ 2012-11-13 10:53 UTC (permalink / raw)
To: Alexey Klimov
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen,
Stephen Warren, kernel
In-Reply-To: <CALW4P+JmyEnnxpC8AuJ1-mPG-Rw0XEyZFogeVaNuw5omdH5-CA@mail.gmail.com>
On Mon, Nov 12, 2012 at 11:00:37PM +0400, Alexey Klimov wrote:
> Hello Steffen,
>
> On Mon, Nov 12, 2012 at 7:37 PM, Steffen Trumtrar
> <s.trumtrar@pengutronix.de> wrote:
> > This adds support for reading display timings from DT or/and convert one of those
> > timings to a videomode.
> > The of_display_timing implementation supports multiple children where each
> > property can have up to 3 values. All children are read into an array, that
> > can be queried.
> > of_get_videomode converts exactly one of that timings to a struct videomode.
> >
> > Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> > Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> > ---
> > .../devicetree/bindings/video/display-timings.txt | 107 +++++++++++
> > drivers/video/Kconfig | 13 ++
> > drivers/video/Makefile | 2 +
> > drivers/video/of_display_timing.c | 186 ++++++++++++++++++++
> > drivers/video/of_videomode.c | 47 +++++
> > include/linux/of_display_timings.h | 19 ++
> > include/linux/of_videomode.h | 15 ++
> > 7 files changed, 389 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/video/display-timings.txt
> > create mode 100644 drivers/video/of_display_timing.c
> > create mode 100644 drivers/video/of_videomode.c
> > create mode 100644 include/linux/of_display_timings.h
> > create mode 100644 include/linux/of_videomode.h
> >
> > diff --git a/Documentation/devicetree/bindings/video/display-timings.txt b/Documentation/devicetree/bindings/video/display-timings.txt
> > new file mode 100644
> > index 0000000..e22e2fd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/video/display-timings.txt
> > @@ -0,0 +1,107 @@
> > +display-timings bindings
> > +============
> > +
> > +display-timings-node
> > +--------------------
> > +
> > +required properties:
> > + - none
> > +
> > +optional properties:
> > + - native-mode: the native mode for the display, in case multiple modes are
> > + provided. When omitted, assume the first node is the native.
> > +
> > +timings-subnode
> > +---------------
> > +
> > +required properties:
> > + - hactive, vactive: Display resolution
> > + - hfront-porch, hback-porch, hsync-len: Horizontal Display timing parameters
> > + in pixels
> > + vfront-porch, vback-porch, vsync-len: Vertical display timing parameters in
> > + lines
> > + - clock-frequency: displayclock in Hz
> > +
> > +optional properties:
> > + - hsync-active : Hsync pulse is active low/high/ignored
> > + - vsync-active : Vsync pulse is active low/high/ignored
> > + - de-active : Data-Enable pulse is active low/high/ignored
> > + - pixelclk-inverted : pixelclock is inverted/non-inverted/ignored
> > + - interlaced (bool)
> > + - doublescan (bool)
> > +
> > +All the optional properties that are not bool follow the following logic:
> > + <1> : high active
> > + <0> : low active
> > + omitted : not used on hardware
> > +
> > +There are different ways of describing the capabilities of a display. The devicetree
> > +representation corresponds to the one commonly found in datasheets for displays.
> > +If a display supports multiple signal timings, the native-mode can be specified.
> > +
> > +The parameters are defined as
> > +
> > +struct display_timing
> > +==========> > +
> > + +----------+---------------------------------------------+----------+-------+
> > + | | ↑ | | |
> > + | | |vback_porch | | |
> > + | | ↓ | | |
> > + +----------###############################################----------+-------+
> > + | # ↑ # | |
> > + | # | # | |
> > + | hback # | # hfront | hsync |
> > + | porch # | hactive # porch | len |
> > + |<-------->#<---------------+--------------------------->#<-------->|<----->|
> > + | # | # | |
> > + | # |vactive # | |
> > + | # | # | |
> > + | # ↓ # | |
> > + +----------###############################################----------+-------+
> > + | | ↑ | | |
> > + | | |vfront_porch | | |
> > + | | ↓ | | |
> > + +----------+---------------------------------------------+----------+-------+
> > + | | ↑ | | |
> > + | | |vsync_len | | |
> > + | | ↓ | | |
> > + +----------+---------------------------------------------+----------+-------+
> > +
> > +
> > +Example:
> > +
> > + display-timings {
> > + native-mode = <&timing0>;
> > + timing0: 1920p24 {
> > + /* 1920x1080p24 */
> > + clock-frequency = <52000000>;
> > + hactive = <1920>;
> > + vactive = <1080>;
> > + hfront-porch = <25>;
> > + hback-porch = <25>;
> > + hsync-len = <25>;
> > + vback-porch = <2>;
> > + vfront-porch = <2>;
> > + vsync-len = <2>;
> > + hsync-active = <1>;
> > + };
> > + };
> > +
> > +Every required property also supports the use of ranges, so the commonly used
> > +datasheet description with <min typ max>-tuples can be used.
> > +
> > +Example:
> > +
> > + timing1: timing {
> > + /* 1920x1080p24 */
> > + clock-frequency = <148500000>;
> > + hactive = <1920>;
> > + vactive = <1080>;
> > + hsync-len = <0 44 60>;
> > + hfront-porch = <80 88 95>;
> > + hback-porch = <100 148 160>;
> > + vfront-porch = <0 4 6>;
> > + vback-porch = <0 36 50>;
> > + vsync-len = <0 5 6>;
> > + };
> > diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> > index 2a23b18..a324457 100644
> > --- a/drivers/video/Kconfig
> > +++ b/drivers/video/Kconfig
> > @@ -39,6 +39,19 @@ config DISPLAY_TIMING
> > config VIDEOMODE
> > bool
> >
> > +config OF_DISPLAY_TIMING
> > + def_bool y
> > + select DISPLAY_TIMING
> > + help
> > + helper to parse display timings from the devicetree
> > +
> > +config OF_VIDEOMODE
> > + def_bool y
> > + select VIDEOMODE
> > + select OF_DISPLAY_TIMING
> > + help
> > + helper to get videomodes from the devicetree
> > +
> > menuconfig FB
> > tristate "Support for frame buffer devices"
> > ---help---
> > diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> > index fc30439..b936b00 100644
> > --- a/drivers/video/Makefile
> > +++ b/drivers/video/Makefile
> > @@ -168,4 +168,6 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o
> > #video output switch sysfs driver
> > obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
> > obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
> > +obj-$(CONFIG_OF_DISPLAY_TIMING) += of_display_timing.o
> > obj-$(CONFIG_VIDEOMODE) += videomode.o
> > +obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o
> > diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
> > new file mode 100644
> > index 0000000..0bd30cc
> > --- /dev/null
> > +++ b/drivers/video/of_display_timing.c
> > @@ -0,0 +1,186 @@
> > +/*
> > + * OF helpers for parsing display timings
> > + *
> > + * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
> > + *
> > + * based on of_videomode.c by Sascha Hauer <s.hauer@pengutronix.de>
> > + *
> > + * This file is released under the GPLv2
> > + */
> > +#include <linux/of.h>
> > +#include <linux/slab.h>
> > +#include <linux/export.h>
> > +#include <linux/of_display_timings.h>
> > +
> > +/**
> > + * parse_property - parse timing_entry from device_node
> > + * @np: device_node with the property
> > + * @name: name of the property
> > + * @result: will be set to the return value
> > + *
> > + * DESCRIPTION:
> > + * Every display_timing can be specified with either just the typical value or
> > + * a range consisting of min/typ/max. This function helps handling this
> > + **/
> > +static int parse_property(struct device_node *np, char *name,
> > + struct timing_entry *result)
> > +{
> > + struct property *prop;
> > + int length, cells, ret;
> > +
> > + prop = of_find_property(np, name, &length);
> > + if (!prop) {
> > + pr_err("%s: could not find property %s\n", __func__, name);
> > + return -EINVAL;
> > + }
> > +
> > + cells = length / sizeof(u32);
> > + if (cells = 1) {
> > + ret = of_property_read_u32(np, name, &result->typ);
> > + result->min = result->typ;
> > + result->max = result->typ;
> > + } else if (cells = 3) {
> > + ret = of_property_read_u32_array(np, name, &result->min, cells);
> > + } else {
> > + pr_err("%s: illegal timing specification in %s\n", __func__, name);
> > + return -EINVAL;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +/**
> > + * of_get_display_timing - parse display_timing entry from device_node
> > + * @np: device_node with the properties
> > + **/
> > +static struct display_timing *of_get_display_timing(struct device_node *np)
> > +{
> > + struct display_timing *dt;
> > + int ret = 0;
> > +
> > + dt = kzalloc(sizeof(*dt), GFP_KERNEL);
> > + if (!dt) {
> > + pr_err("%s: could not allocate display_timing struct\n", __func__);
> > + return NULL;
> > + }
> > +
> > + ret |= parse_property(np, "hback-porch", &dt->hback_porch);
> > + ret |= parse_property(np, "hfront-porch", &dt->hfront_porch);
> > + ret |= parse_property(np, "hactive", &dt->hactive);
> > + ret |= parse_property(np, "hsync-len", &dt->hsync_len);
> > + ret |= parse_property(np, "vback-porch", &dt->vback_porch);
> > + ret |= parse_property(np, "vfront-porch", &dt->vfront_porch);
> > + ret |= parse_property(np, "vactive", &dt->vactive);
> > + ret |= parse_property(np, "vsync-len", &dt->vsync_len);
> > + ret |= parse_property(np, "clock-frequency", &dt->pixelclock);
> > +
> > + of_property_read_u32(np, "vsync-active", &dt->vsync_pol_active);
> > + of_property_read_u32(np, "hsync-active", &dt->hsync_pol_active);
> > + of_property_read_u32(np, "de-active", &dt->de_pol_active);
> > + of_property_read_u32(np, "pixelclk-inverted", &dt->pixelclk_pol);
> > + dt->interlaced = of_property_read_bool(np, "interlaced");
> > + dt->doublescan = of_property_read_bool(np, "doublescan");
> > +
> > + if (ret) {
> > + pr_err("%s: error reading timing properties\n", __func__);
> > + return NULL;
> > + }
> > +
> > + return dt;
> > +}
> > +
> > +/**
> > + * of_get_display_timings - parse all display_timing entries from a device_node
> > + * @np: device_node with the subnodes
> > + **/
> > +struct display_timings *of_get_display_timings(struct device_node *np)
> > +{
> > + struct device_node *timings_np;
> > + struct device_node *entry;
> > + struct device_node *native_mode;
> > + struct display_timings *disp;
> > +
> > + if (!np) {
> > + pr_err("%s: no devicenode given\n", __func__);
> > + return NULL;
> > + }
> > +
> > + timings_np = of_find_node_by_name(np, "display-timings");
> > + if (!timings_np) {
> > + pr_err("%s: could not find display-timings node\n", __func__);
> > + return NULL;
> > + }
> > +
> > + disp = kzalloc(sizeof(*disp), GFP_KERNEL);
> > + if (!disp)
> > + return -ENOMEM;
> > +
> > + entry = of_parse_phandle(timings_np, "native-mode", 0);
> > + /* assume first child as native mode if none provided */
> > + if (!entry)
> > + entry = of_get_next_child(np, NULL);
> > + if (!entry) {
> > + pr_err("%s: no timing specifications given\n", __func__);
> > + return NULL;
> > + }
> > +
> > + pr_info("%s: using %s as default timing\n", __func__, entry->name);
> > +
> > + native_mode = entry;
> > +
> > + disp->num_timings = of_get_child_count(timings_np);
> > + disp->timings = kzalloc(sizeof(struct display_timing *)*disp->num_timings,
> > + GFP_KERNEL);
> > + if (!disp->timings)
> > + return -ENOMEM;
>
> Could you please check return values here ^^^ and above "disp > kzalloc(sizeof(*disp), GFP_KERNEL);" ?
> May be it's better to return NULL instead of -ENOMEM and put error message?
>
I will do that along with the memory leak fixes.
Regards,
Steffen
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply
* Re: [PATCH v8 1/6] video: add display_timing and videomode
From: Thierry Reding @ 2012-11-13 10:41 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Guennady Liakhovetski, linux-media,
Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-2-git-send-email-s.trumtrar@pengutronix.de>
[-- Attachment #1: Type: text/plain, Size: 2509 bytes --]
On Mon, Nov 12, 2012 at 04:37:01PM +0100, Steffen Trumtrar wrote:
[...]
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index d08d799..2a23b18 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -33,6 +33,12 @@ config VIDEO_OUTPUT_CONTROL
> This framework adds support for low-level control of the video
> output switch.
>
> +config DISPLAY_TIMING
DISPLAY_TIMINGS?
> #video output switch sysfs driver
> obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
> +obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
display_timings.o?
> +obj-$(CONFIG_VIDEOMODE) += videomode.o
> diff --git a/drivers/video/display_timing.c b/drivers/video/display_timing.c
display_timings.c?
> +int videomode_from_timing(struct display_timings *disp, struct videomode *vm,
> + unsigned int index)
I find the indexing API a bit confusing. But that's perhaps just a
matter of personal preference.
Also the ordering of arguments seems a little off. I find it more
natural to have the destination pointer in the first argument, similar
to the memcpy() function, so this would be:
int videomode_from_timing(struct videomode *vm, struct display_timings *disp,
unsigned int index);
Actually, when reading videomode_from_timing() I'd expect the argument
list to be:
int videomode_from_timing(struct videomode *vm, struct display_timing *timing);
Am I the only one confused by this?
> diff --git a/include/linux/display_timing.h b/include/linux/display_timing.h
display_timings.h?
> +/* placeholder function until ranges are really needed
The above line has trailing whitespace. Also the block comment should
have the opening /* on a separate line.
> + * the index parameter should then be used to select one of [min typ max]
If index is supposed to select min, typ or max, then maybe an enum would
be a better candidate? Or alternatively provide separate accessors, like
display_timing_get_{minimum,typical,maximum}().
> + */
> +static inline u32 display_timing_get_value(struct timing_entry *te,
> + unsigned int index)
> +{
> + return te->typ;
> +}
> +
> +static inline struct display_timing *display_timings_get(struct display_timings *disp,
> + unsigned int index)
> +{
> + if (disp->num_timings > index)
> + return disp->timings[index];
> + else
> + return NULL;
> +}
> +
> +void timings_release(struct display_timings *disp);
This function no longer exists.
Thierry
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^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Steffen Trumtrar @ 2012-11-13 8:32 UTC (permalink / raw)
To: Sascha Hauer
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen,
Stephen Warren, kernel
In-Reply-To: <20121112185840.GX10369@pengutronix.de>
Hi!
On Mon, Nov 12, 2012 at 07:58:40PM +0100, Sascha Hauer wrote:
> Hi Steffen,
>
> You lose memory in several places:
>
> On Mon, Nov 12, 2012 at 04:37:02PM +0100, Steffen Trumtrar wrote:
> > +static struct display_timing *of_get_display_timing(struct device_node *np)
> > +{
> > + struct display_timing *dt;
> > + int ret = 0;
> > +
> > + dt = kzalloc(sizeof(*dt), GFP_KERNEL);
> > + if (!dt) {
> > + pr_err("%s: could not allocate display_timing struct\n", __func__);
> > + return NULL;
> > + }
> > +
> > + ret |= parse_property(np, "hback-porch", &dt->hback_porch);
> > + ret |= parse_property(np, "hfront-porch", &dt->hfront_porch);
> > + ret |= parse_property(np, "hactive", &dt->hactive);
> > + ret |= parse_property(np, "hsync-len", &dt->hsync_len);
> > + ret |= parse_property(np, "vback-porch", &dt->vback_porch);
> > + ret |= parse_property(np, "vfront-porch", &dt->vfront_porch);
> > + ret |= parse_property(np, "vactive", &dt->vactive);
> > + ret |= parse_property(np, "vsync-len", &dt->vsync_len);
> > + ret |= parse_property(np, "clock-frequency", &dt->pixelclock);
> > +
> > + of_property_read_u32(np, "vsync-active", &dt->vsync_pol_active);
> > + of_property_read_u32(np, "hsync-active", &dt->hsync_pol_active);
> > + of_property_read_u32(np, "de-active", &dt->de_pol_active);
> > + of_property_read_u32(np, "pixelclk-inverted", &dt->pixelclk_pol);
> > + dt->interlaced = of_property_read_bool(np, "interlaced");
> > + dt->doublescan = of_property_read_bool(np, "doublescan");
> > +
> > + if (ret) {
> > + pr_err("%s: error reading timing properties\n", __func__);
> > + return NULL;
>
> Here
>
> > + }
> > +
> > + return dt;
> > +}
> > +
> > +/**
> > + * of_get_display_timings - parse all display_timing entries from a device_node
> > + * @np: device_node with the subnodes
> > + **/
> > +struct display_timings *of_get_display_timings(struct device_node *np)
> > +{
> > + struct device_node *timings_np;
> > + struct device_node *entry;
> > + struct device_node *native_mode;
> > + struct display_timings *disp;
> > +
> > + if (!np) {
> > + pr_err("%s: no devicenode given\n", __func__);
> > + return NULL;
> > + }
> > +
> > + timings_np = of_find_node_by_name(np, "display-timings");
> > + if (!timings_np) {
> > + pr_err("%s: could not find display-timings node\n", __func__);
> > + return NULL;
> > + }
> > +
> > + disp = kzalloc(sizeof(*disp), GFP_KERNEL);
> > + if (!disp)
> > + return -ENOMEM;
> > +
> > + entry = of_parse_phandle(timings_np, "native-mode", 0);
> > + /* assume first child as native mode if none provided */
> > + if (!entry)
> > + entry = of_get_next_child(np, NULL);
> > + if (!entry) {
> > + pr_err("%s: no timing specifications given\n", __func__);
> > + return NULL;
>
> Here
>
> > + }
> > +
> > + pr_info("%s: using %s as default timing\n", __func__, entry->name);
> > +
> > + native_mode = entry;
> > +
> > + disp->num_timings = of_get_child_count(timings_np);
> > + disp->timings = kzalloc(sizeof(struct display_timing *)*disp->num_timings,
> > + GFP_KERNEL);
> > + if (!disp->timings)
> > + return -ENOMEM;
>
> Here
>
> > +
> > + disp->num_timings = 0;
> > + disp->native_mode = 0;
> > +
> > + for_each_child_of_node(timings_np, entry) {
> > + struct display_timing *dt;
> > +
> > + dt = of_get_display_timing(entry);
> > + if (!dt) {
> > + /* to not encourage wrong devicetrees, fail in case of an error */
> > + pr_err("%s: error in timing %d\n", __func__, disp->num_timings+1);
> > + return NULL;
>
> Here
>
> > + }
> > +
> > + if (native_mode = entry)
> > + disp->native_mode = disp->num_timings;
> > +
> > + disp->timings[disp->num_timings] = dt;
> > + disp->num_timings++;
> > + }
> > + of_node_put(timings_np);
> > +
> > + if (disp->num_timings > 0)
> > + pr_info("%s: got %d timings. Using timing #%d as default\n", __func__,
> > + disp->num_timings , disp->native_mode + 1);
> > + else {
> > + pr_err("%s: no valid timings specified\n", __func__);
> > + return NULL;
>
> and here
>
Well,... you are right. :-(
Regards,
Steffen
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply
* Re: [PATCH 0/5] OMAPFB: use dma_alloc instead of omap's vram
From: Tony Lindgren @ 2012-11-12 22:50 UTC (permalink / raw)
To: linux-arm-kernel
In-Reply-To: <1352715906-16946-1-git-send-email-tomi.valkeinen@ti.com>
* Tomi Valkeinen <tomi.valkeinen@ti.com> [121112 02:27]:
> Hi,
>
> This series changes omapfb to use standard dma_alloc funcs instead of omap
> specific vram allocator. This let's us remove the omap vram allocator, making
> omapfb platform independent.
>
> However, note that using standard dma funcs causes the following downsides:
>
> 1) dma_alloc_attrs doesn't let us allocate at certain physical address.
> However, this should not be a problem as this feature of vram allocator
> is only used when reserving the framebuffer that was initialized by the
> bootloader, and we don't currently support "passing" a framebuffer from
> the bootloader to the kernel anyway.
>
> 2) dma_alloc_attrs, as of now, always ioremaps the allocated area, and
> we don't need the ioremap when using VRFB. This patch uses
> DMA_ATTR_NO_KERNEL_MAPPING for the allocation, but the flag is currently
> not operational.
>
> 3) OMAPFB_GET_VRAM_INFO ioctl cannot return real values anymore. I
> changed the ioctl to return 64M for all the values, which, I hope, the
> applications will interpret as "there's enough vram".
>
> 4) "vram" kernel parameter to define how much ram to reserve for video use no
> longer works. The user needs to enable CMA and use "cma" parameter.
Great, thanks for fixing these. Could you please queue these into
a separate branch against v3.7-rc5 that I can also merge into
omap-for-v3.8/cleanup-headers-prepare-multiplatform-v3?
Feel free to add my Acked-by: Tony Lindgren <tony@atomide.com> to the
arch/arm/*omap*/* parts.
Regards,
Tony
^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Stephen Warren @ 2012-11-12 20:40 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen, kernel
In-Reply-To: <1352734626-27412-3-git-send-email-s.trumtrar@pengutronix.de>
On 11/12/2012 08:37 AM, Steffen Trumtrar wrote:
> This adds support for reading display timings from DT or/and convert one of those
> timings to a videomode.
> The of_display_timing implementation supports multiple children where each
> property can have up to 3 values. All children are read into an array, that
> can be queried.
> of_get_videomode converts exactly one of that timings to a struct videomode.
> diff --git a/Documentation/devicetree/bindings/video/display-timings.txt b/Documentation/devicetree/bindings/video/display-timings.txt
The device tree bindings look reasonable to me, so,
Acked-by: Stephen Warren <swarren@nvidia.com>
^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Alexey Klimov @ 2012-11-12 19:00 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen,
Stephen Warren, kernel
In-Reply-To: <1352734626-27412-3-git-send-email-s.trumtrar@pengutronix.de>
Hello Steffen,
On Mon, Nov 12, 2012 at 7:37 PM, Steffen Trumtrar
<s.trumtrar@pengutronix.de> wrote:
> This adds support for reading display timings from DT or/and convert one of those
> timings to a videomode.
> The of_display_timing implementation supports multiple children where each
> property can have up to 3 values. All children are read into an array, that
> can be queried.
> of_get_videomode converts exactly one of that timings to a struct videomode.
>
> Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
> .../devicetree/bindings/video/display-timings.txt | 107 +++++++++++
> drivers/video/Kconfig | 13 ++
> drivers/video/Makefile | 2 +
> drivers/video/of_display_timing.c | 186 ++++++++++++++++++++
> drivers/video/of_videomode.c | 47 +++++
> include/linux/of_display_timings.h | 19 ++
> include/linux/of_videomode.h | 15 ++
> 7 files changed, 389 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/video/display-timings.txt
> create mode 100644 drivers/video/of_display_timing.c
> create mode 100644 drivers/video/of_videomode.c
> create mode 100644 include/linux/of_display_timings.h
> create mode 100644 include/linux/of_videomode.h
>
> diff --git a/Documentation/devicetree/bindings/video/display-timings.txt b/Documentation/devicetree/bindings/video/display-timings.txt
> new file mode 100644
> index 0000000..e22e2fd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/video/display-timings.txt
> @@ -0,0 +1,107 @@
> +display-timings bindings
> +============
> +
> +display-timings-node
> +--------------------
> +
> +required properties:
> + - none
> +
> +optional properties:
> + - native-mode: the native mode for the display, in case multiple modes are
> + provided. When omitted, assume the first node is the native.
> +
> +timings-subnode
> +---------------
> +
> +required properties:
> + - hactive, vactive: Display resolution
> + - hfront-porch, hback-porch, hsync-len: Horizontal Display timing parameters
> + in pixels
> + vfront-porch, vback-porch, vsync-len: Vertical display timing parameters in
> + lines
> + - clock-frequency: displayclock in Hz
> +
> +optional properties:
> + - hsync-active : Hsync pulse is active low/high/ignored
> + - vsync-active : Vsync pulse is active low/high/ignored
> + - de-active : Data-Enable pulse is active low/high/ignored
> + - pixelclk-inverted : pixelclock is inverted/non-inverted/ignored
> + - interlaced (bool)
> + - doublescan (bool)
> +
> +All the optional properties that are not bool follow the following logic:
> + <1> : high active
> + <0> : low active
> + omitted : not used on hardware
> +
> +There are different ways of describing the capabilities of a display. The devicetree
> +representation corresponds to the one commonly found in datasheets for displays.
> +If a display supports multiple signal timings, the native-mode can be specified.
> +
> +The parameters are defined as
> +
> +struct display_timing
> +==========> +
> + +----------+---------------------------------------------+----------+-------+
> + | | ↑ | | |
> + | | |vback_porch | | |
> + | | ↓ | | |
> + +----------###############################################----------+-------+
> + | # ↑ # | |
> + | # | # | |
> + | hback # | # hfront | hsync |
> + | porch # | hactive # porch | len |
> + |<-------->#<---------------+--------------------------->#<-------->|<----->|
> + | # | # | |
> + | # |vactive # | |
> + | # | # | |
> + | # ↓ # | |
> + +----------###############################################----------+-------+
> + | | ↑ | | |
> + | | |vfront_porch | | |
> + | | ↓ | | |
> + +----------+---------------------------------------------+----------+-------+
> + | | ↑ | | |
> + | | |vsync_len | | |
> + | | ↓ | | |
> + +----------+---------------------------------------------+----------+-------+
> +
> +
> +Example:
> +
> + display-timings {
> + native-mode = <&timing0>;
> + timing0: 1920p24 {
> + /* 1920x1080p24 */
> + clock-frequency = <52000000>;
> + hactive = <1920>;
> + vactive = <1080>;
> + hfront-porch = <25>;
> + hback-porch = <25>;
> + hsync-len = <25>;
> + vback-porch = <2>;
> + vfront-porch = <2>;
> + vsync-len = <2>;
> + hsync-active = <1>;
> + };
> + };
> +
> +Every required property also supports the use of ranges, so the commonly used
> +datasheet description with <min typ max>-tuples can be used.
> +
> +Example:
> +
> + timing1: timing {
> + /* 1920x1080p24 */
> + clock-frequency = <148500000>;
> + hactive = <1920>;
> + vactive = <1080>;
> + hsync-len = <0 44 60>;
> + hfront-porch = <80 88 95>;
> + hback-porch = <100 148 160>;
> + vfront-porch = <0 4 6>;
> + vback-porch = <0 36 50>;
> + vsync-len = <0 5 6>;
> + };
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index 2a23b18..a324457 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -39,6 +39,19 @@ config DISPLAY_TIMING
> config VIDEOMODE
> bool
>
> +config OF_DISPLAY_TIMING
> + def_bool y
> + select DISPLAY_TIMING
> + help
> + helper to parse display timings from the devicetree
> +
> +config OF_VIDEOMODE
> + def_bool y
> + select VIDEOMODE
> + select OF_DISPLAY_TIMING
> + help
> + helper to get videomodes from the devicetree
> +
> menuconfig FB
> tristate "Support for frame buffer devices"
> ---help---
> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> index fc30439..b936b00 100644
> --- a/drivers/video/Makefile
> +++ b/drivers/video/Makefile
> @@ -168,4 +168,6 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o
> #video output switch sysfs driver
> obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
> obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
> +obj-$(CONFIG_OF_DISPLAY_TIMING) += of_display_timing.o
> obj-$(CONFIG_VIDEOMODE) += videomode.o
> +obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o
> diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
> new file mode 100644
> index 0000000..0bd30cc
> --- /dev/null
> +++ b/drivers/video/of_display_timing.c
> @@ -0,0 +1,186 @@
> +/*
> + * OF helpers for parsing display timings
> + *
> + * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
> + *
> + * based on of_videomode.c by Sascha Hauer <s.hauer@pengutronix.de>
> + *
> + * This file is released under the GPLv2
> + */
> +#include <linux/of.h>
> +#include <linux/slab.h>
> +#include <linux/export.h>
> +#include <linux/of_display_timings.h>
> +
> +/**
> + * parse_property - parse timing_entry from device_node
> + * @np: device_node with the property
> + * @name: name of the property
> + * @result: will be set to the return value
> + *
> + * DESCRIPTION:
> + * Every display_timing can be specified with either just the typical value or
> + * a range consisting of min/typ/max. This function helps handling this
> + **/
> +static int parse_property(struct device_node *np, char *name,
> + struct timing_entry *result)
> +{
> + struct property *prop;
> + int length, cells, ret;
> +
> + prop = of_find_property(np, name, &length);
> + if (!prop) {
> + pr_err("%s: could not find property %s\n", __func__, name);
> + return -EINVAL;
> + }
> +
> + cells = length / sizeof(u32);
> + if (cells = 1) {
> + ret = of_property_read_u32(np, name, &result->typ);
> + result->min = result->typ;
> + result->max = result->typ;
> + } else if (cells = 3) {
> + ret = of_property_read_u32_array(np, name, &result->min, cells);
> + } else {
> + pr_err("%s: illegal timing specification in %s\n", __func__, name);
> + return -EINVAL;
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * of_get_display_timing - parse display_timing entry from device_node
> + * @np: device_node with the properties
> + **/
> +static struct display_timing *of_get_display_timing(struct device_node *np)
> +{
> + struct display_timing *dt;
> + int ret = 0;
> +
> + dt = kzalloc(sizeof(*dt), GFP_KERNEL);
> + if (!dt) {
> + pr_err("%s: could not allocate display_timing struct\n", __func__);
> + return NULL;
> + }
> +
> + ret |= parse_property(np, "hback-porch", &dt->hback_porch);
> + ret |= parse_property(np, "hfront-porch", &dt->hfront_porch);
> + ret |= parse_property(np, "hactive", &dt->hactive);
> + ret |= parse_property(np, "hsync-len", &dt->hsync_len);
> + ret |= parse_property(np, "vback-porch", &dt->vback_porch);
> + ret |= parse_property(np, "vfront-porch", &dt->vfront_porch);
> + ret |= parse_property(np, "vactive", &dt->vactive);
> + ret |= parse_property(np, "vsync-len", &dt->vsync_len);
> + ret |= parse_property(np, "clock-frequency", &dt->pixelclock);
> +
> + of_property_read_u32(np, "vsync-active", &dt->vsync_pol_active);
> + of_property_read_u32(np, "hsync-active", &dt->hsync_pol_active);
> + of_property_read_u32(np, "de-active", &dt->de_pol_active);
> + of_property_read_u32(np, "pixelclk-inverted", &dt->pixelclk_pol);
> + dt->interlaced = of_property_read_bool(np, "interlaced");
> + dt->doublescan = of_property_read_bool(np, "doublescan");
> +
> + if (ret) {
> + pr_err("%s: error reading timing properties\n", __func__);
> + return NULL;
> + }
> +
> + return dt;
> +}
> +
> +/**
> + * of_get_display_timings - parse all display_timing entries from a device_node
> + * @np: device_node with the subnodes
> + **/
> +struct display_timings *of_get_display_timings(struct device_node *np)
> +{
> + struct device_node *timings_np;
> + struct device_node *entry;
> + struct device_node *native_mode;
> + struct display_timings *disp;
> +
> + if (!np) {
> + pr_err("%s: no devicenode given\n", __func__);
> + return NULL;
> + }
> +
> + timings_np = of_find_node_by_name(np, "display-timings");
> + if (!timings_np) {
> + pr_err("%s: could not find display-timings node\n", __func__);
> + return NULL;
> + }
> +
> + disp = kzalloc(sizeof(*disp), GFP_KERNEL);
> + if (!disp)
> + return -ENOMEM;
> +
> + entry = of_parse_phandle(timings_np, "native-mode", 0);
> + /* assume first child as native mode if none provided */
> + if (!entry)
> + entry = of_get_next_child(np, NULL);
> + if (!entry) {
> + pr_err("%s: no timing specifications given\n", __func__);
> + return NULL;
> + }
> +
> + pr_info("%s: using %s as default timing\n", __func__, entry->name);
> +
> + native_mode = entry;
> +
> + disp->num_timings = of_get_child_count(timings_np);
> + disp->timings = kzalloc(sizeof(struct display_timing *)*disp->num_timings,
> + GFP_KERNEL);
> + if (!disp->timings)
> + return -ENOMEM;
Could you please check return values here ^^^ and above "disp kzalloc(sizeof(*disp), GFP_KERNEL);" ?
May be it's better to return NULL instead of -ENOMEM and put error message?
--
Best regards, Klimov Alexey
^ permalink raw reply
* Re: [PATCH v8 2/6] video: add of helper for videomode
From: Sascha Hauer @ 2012-11-12 18:58 UTC (permalink / raw)
To: Steffen Trumtrar
Cc: devicetree-discuss, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen,
Stephen Warren, kernel
In-Reply-To: <1352734626-27412-3-git-send-email-s.trumtrar@pengutronix.de>
Hi Steffen,
You lose memory in several places:
On Mon, Nov 12, 2012 at 04:37:02PM +0100, Steffen Trumtrar wrote:
> +static struct display_timing *of_get_display_timing(struct device_node *np)
> +{
> + struct display_timing *dt;
> + int ret = 0;
> +
> + dt = kzalloc(sizeof(*dt), GFP_KERNEL);
> + if (!dt) {
> + pr_err("%s: could not allocate display_timing struct\n", __func__);
> + return NULL;
> + }
> +
> + ret |= parse_property(np, "hback-porch", &dt->hback_porch);
> + ret |= parse_property(np, "hfront-porch", &dt->hfront_porch);
> + ret |= parse_property(np, "hactive", &dt->hactive);
> + ret |= parse_property(np, "hsync-len", &dt->hsync_len);
> + ret |= parse_property(np, "vback-porch", &dt->vback_porch);
> + ret |= parse_property(np, "vfront-porch", &dt->vfront_porch);
> + ret |= parse_property(np, "vactive", &dt->vactive);
> + ret |= parse_property(np, "vsync-len", &dt->vsync_len);
> + ret |= parse_property(np, "clock-frequency", &dt->pixelclock);
> +
> + of_property_read_u32(np, "vsync-active", &dt->vsync_pol_active);
> + of_property_read_u32(np, "hsync-active", &dt->hsync_pol_active);
> + of_property_read_u32(np, "de-active", &dt->de_pol_active);
> + of_property_read_u32(np, "pixelclk-inverted", &dt->pixelclk_pol);
> + dt->interlaced = of_property_read_bool(np, "interlaced");
> + dt->doublescan = of_property_read_bool(np, "doublescan");
> +
> + if (ret) {
> + pr_err("%s: error reading timing properties\n", __func__);
> + return NULL;
Here
> + }
> +
> + return dt;
> +}
> +
> +/**
> + * of_get_display_timings - parse all display_timing entries from a device_node
> + * @np: device_node with the subnodes
> + **/
> +struct display_timings *of_get_display_timings(struct device_node *np)
> +{
> + struct device_node *timings_np;
> + struct device_node *entry;
> + struct device_node *native_mode;
> + struct display_timings *disp;
> +
> + if (!np) {
> + pr_err("%s: no devicenode given\n", __func__);
> + return NULL;
> + }
> +
> + timings_np = of_find_node_by_name(np, "display-timings");
> + if (!timings_np) {
> + pr_err("%s: could not find display-timings node\n", __func__);
> + return NULL;
> + }
> +
> + disp = kzalloc(sizeof(*disp), GFP_KERNEL);
> + if (!disp)
> + return -ENOMEM;
> +
> + entry = of_parse_phandle(timings_np, "native-mode", 0);
> + /* assume first child as native mode if none provided */
> + if (!entry)
> + entry = of_get_next_child(np, NULL);
> + if (!entry) {
> + pr_err("%s: no timing specifications given\n", __func__);
> + return NULL;
Here
> + }
> +
> + pr_info("%s: using %s as default timing\n", __func__, entry->name);
> +
> + native_mode = entry;
> +
> + disp->num_timings = of_get_child_count(timings_np);
> + disp->timings = kzalloc(sizeof(struct display_timing *)*disp->num_timings,
> + GFP_KERNEL);
> + if (!disp->timings)
> + return -ENOMEM;
Here
> +
> + disp->num_timings = 0;
> + disp->native_mode = 0;
> +
> + for_each_child_of_node(timings_np, entry) {
> + struct display_timing *dt;
> +
> + dt = of_get_display_timing(entry);
> + if (!dt) {
> + /* to not encourage wrong devicetrees, fail in case of an error */
> + pr_err("%s: error in timing %d\n", __func__, disp->num_timings+1);
> + return NULL;
Here
> + }
> +
> + if (native_mode = entry)
> + disp->native_mode = disp->num_timings;
> +
> + disp->timings[disp->num_timings] = dt;
> + disp->num_timings++;
> + }
> + of_node_put(timings_np);
> +
> + if (disp->num_timings > 0)
> + pr_info("%s: got %d timings. Using timing #%d as default\n", __func__,
> + disp->num_timings , disp->native_mode + 1);
> + else {
> + pr_err("%s: no valid timings specified\n", __func__);
> + return NULL;
and here
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply
* Re: [PATCH 0/2] Adding devm_ functions and DT support to MIPI driver
From: Shaik Ameer Basha @ 2012-11-12 18:23 UTC (permalink / raw)
To: linux-fbdev
In-Reply-To: <1352547285-12302-1-git-send-email-shaik.ameer@samsung.com>
Hi Tomi,
On Mon, Nov 12, 2012 at 6:05 PM, Tomi Valkeinen <tomba@iki.fi> wrote:
> Hi,
>
> On 2012-11-10 13:34, Shaik Ameer Basha wrote:
>> In this patch series,
>>
>> First patch adds the devm_ functions to the driver code for automatic
>> code cleanup.
>>
>> Second patch adds the DT support for the exynos mipi-dsi driver.
>> for DT support, mipi device node should supply the following
>> information to the mipi-dsi driver.
>> 1] dsim_config information
>> 2] d-phy setting information
>> 3] lcd poweron, reset information
>> 4] fb_videomode information
>>
>> refer the documentation files for further details.
>>
>> Shaik Ameer Basha (2):
>> exynos-mipi-dsi: using devm_ functions for automatic cleanup
>> video: exynos-mipi-dsi: Adding DT support to exynos mipi driver
>
> MIPI is an organization. DSI is a protocol from MIPI. MIPI has many
> protocols. Thus it doesn't make sense to say "MIPI driver", "MIPI
> display", or use names like "samsung,exynos-mipi".
>
> It's either "MIPI DSI" if you want to be exact, or just "DSI", which I
> think is clear from the context.
Thanks for pointing this out, It's a fault from my side.
I will be specific/careful from next time on-wards...
>
> What is "dsim"?
>
As Sylwester mentioned, mipi-dsim stands for MIPI DSI Master.
> Tomi
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply
* [PATCH v8 6/6] drm_modes: add of_videomode helpers
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Thierry Reding, Guennady Liakhovetski,
linux-media, Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-1-git-send-email-s.trumtrar@pengutronix.de>
Add helper to get drm_display_mode from devicetree.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/gpu/drm/drm_modes.c | 41 +++++++++++++++++++++++++++++++++++++++++
include/drm/drmP.h | 5 +++++
2 files changed, 46 insertions(+)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 049624d..c77da59 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -35,6 +35,7 @@
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
+#include <linux/of.h>
#include <linux/videomode.h>
/**
@@ -540,6 +541,46 @@ int videomode_to_display_mode(struct videomode *vm, struct drm_display_mode *dmo
EXPORT_SYMBOL_GPL(videomode_to_display_mode);
#endif
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
+static void dump_drm_displaymode(struct drm_display_mode *m)
+{
+ pr_debug("drm_displaymode = %d %d %d %d %d %d %d %d %d\n",
+ m->hdisplay, m->hsync_start, m->hsync_end, m->htotal,
+ m->vdisplay, m->vsync_start, m->vsync_end, m->vtotal,
+ m->clock);
+}
+
+/**
+ * of_get_drm_display_mode - get a drm_display_mode from devicetree
+ * @np: device_node with the timing specification
+ * @dmode: will be set to the return value
+ * @index: index into the list of display timings in devicetree
+ *
+ * This function is expensive and should only be used, if only one mode is to be
+ * read from DT. To get multiple modes start with of_get_display_timings and
+ * work with that instead.
+ */
+int of_get_drm_display_mode(struct device_node *np, struct drm_display_mode *dmode,
+ int index)
+{
+ struct videomode vm;
+ int ret;
+
+ ret = of_get_videomode(np, &vm, index);
+ if (ret)
+ return ret;
+
+ videomode_to_display_mode(&vm, dmode);
+
+ pr_info("%s: got %dx%d display mode from %s\n", __func__, vm.hactive,
+ vm.vactive, np->name);
+ dump_drm_displaymode(dmode);
+
+ return 0;
+
+}
+EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
+#endif
/**
* drm_mode_set_name - set the name on a mode
* @mode: name will be set in this mode
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index e9fa1e3..4f9c44e 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -56,6 +56,7 @@
#include <linux/cdev.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/of.h>
#include <linux/videomode.h>
#if defined(__alpha__) || defined(__powerpc__)
#include <asm/pgtable.h> /* For pte_wrprotect */
@@ -1457,6 +1458,10 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev,
extern int videomode_to_display_mode(struct videomode *vm,
struct drm_display_mode *dmode);
+extern int of_get_drm_display_mode(struct device_node *np,
+ struct drm_display_mode *dmode,
+ int index);
+
/* Modesetting support */
extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);
extern void drm_vblank_post_modeset(struct drm_device *dev, int crtc);
--
1.7.10.4
^ permalink raw reply related
* [PATCH v8 5/6] drm_modes: add videomode helpers
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Thierry Reding, Guennady Liakhovetski,
linux-media, Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-1-git-send-email-s.trumtrar@pengutronix.de>
Add conversion from videomode to drm_display_mode
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/gpu/drm/drm_modes.c | 36 ++++++++++++++++++++++++++++++++++++
include/drm/drmP.h | 3 +++
2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 59450f3..049624d 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -35,6 +35,7 @@
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
+#include <linux/videomode.h>
/**
* drm_mode_debug_printmodeline - debug print a mode
@@ -504,6 +505,41 @@ drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
}
EXPORT_SYMBOL(drm_gtf_mode);
+#if IS_ENABLED(CONFIG_VIDEOMODE)
+int videomode_to_display_mode(struct videomode *vm, struct drm_display_mode *dmode)
+{
+ dmode->hdisplay = vm->hactive;
+ dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
+ dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
+ dmode->htotal = dmode->hsync_end + vm->hback_porch;
+
+ dmode->vdisplay = vm->vactive;
+ dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
+ dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
+ dmode->vtotal = dmode->vsync_end + vm->vback_porch;
+
+ dmode->clock = vm->pixelclock / 1000;
+
+ dmode->flags = 0;
+ if (vm->hah)
+ dmode->flags |= DRM_MODE_FLAG_PHSYNC;
+ else
+ dmode->flags |= DRM_MODE_FLAG_NHSYNC;
+ if (vm->vah)
+ dmode->flags |= DRM_MODE_FLAG_PVSYNC;
+ else
+ dmode->flags |= DRM_MODE_FLAG_NVSYNC;
+ if (vm->interlaced)
+ dmode->flags |= DRM_MODE_FLAG_INTERLACE;
+ if (vm->doublescan)
+ dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
+ drm_mode_set_name(dmode);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(videomode_to_display_mode);
+#endif
+
/**
* drm_mode_set_name - set the name on a mode
* @mode: name will be set in this mode
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 3fd8280..e9fa1e3 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -56,6 +56,7 @@
#include <linux/cdev.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/videomode.h>
#if defined(__alpha__) || defined(__powerpc__)
#include <asm/pgtable.h> /* For pte_wrprotect */
#endif
@@ -1454,6 +1455,8 @@ extern struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device *dev,
struct drm_cmdline_mode *cmd);
+extern int videomode_to_display_mode(struct videomode *vm,
+ struct drm_display_mode *dmode);
/* Modesetting support */
extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);
extern void drm_vblank_post_modeset(struct drm_device *dev, int crtc);
--
1.7.10.4
^ permalink raw reply related
* [PATCH v8 4/6] fbmon: add of_videomode helpers
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Thierry Reding, Guennady Liakhovetski,
linux-media, Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-1-git-send-email-s.trumtrar@pengutronix.de>
Add helper to get fb_videomode from devicetree.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/video/fbmon.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/fb.h | 3 +++
2 files changed, 43 insertions(+)
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index d46ecef..c95be79 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -1409,6 +1409,46 @@ int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode)
EXPORT_SYMBOL_GPL(videomode_to_fb_videomode);
#endif
+#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
+static void dump_fb_videomode(struct fb_videomode *m)
+{
+ pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
+ m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
+ m->right_margin, m->upper_margin, m->lower_margin,
+ m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
+}
+
+/**
+ * of_get_fb_videomode - get a fb_videomode from devicetree
+ * @np: device_node with the timing specification
+ * @fb: will be set to the return value
+ * @index: index into the list of display timings in devicetree
+ *
+ * DESCRIPTION:
+ * This function is expensive and should only be used, if only one mode is to be
+ * read from DT. To get multiple modes start with of_get_display_timings ond
+ * work with that instead.
+ */
+int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
+ int index)
+{
+ struct videomode vm;
+ int ret;
+
+ ret = of_get_videomode(np, &vm, index);
+ if (ret)
+ return ret;
+
+ videomode_to_fb_videomode(&vm, fb);
+
+ pr_info("%s: got %dx%d display mode from %s\n", __func__, vm.hactive,
+ vm.vactive, np->name);
+ dump_fb_videomode(fb);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_fb_videomode);
+#endif
#else
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 46c665b..9892fd6 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -14,6 +14,8 @@
#include <linux/backlight.h>
#include <linux/slab.h>
#include <asm/io.h>
+#include <linux/of.h>
+#include <linux/of_videomode.h>
struct vm_area_struct;
struct fb_info;
@@ -714,6 +716,7 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
+extern int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, int index);
extern int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode);
/* drivers/video/modedb.c */
--
1.7.10.4
^ permalink raw reply related
* [PATCH v8 3/6] fbmon: add videomode helpers
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Thierry Reding, Guennady Liakhovetski,
linux-media, Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-1-git-send-email-s.trumtrar@pengutronix.de>
Add a function to convert from the generic videomode to a fb_videomode.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/video/fbmon.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/fb.h | 2 ++
2 files changed, 39 insertions(+)
diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index cef6557..d46ecef 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -1373,6 +1373,43 @@ int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_inf
kfree(timings);
return err;
}
+
+#if IS_ENABLED(CONFIG_VIDEOMODE)
+int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode)
+{
+ fbmode->xres = vm->hactive;
+ fbmode->left_margin = vm->hback_porch;
+ fbmode->right_margin = vm->hfront_porch;
+ fbmode->hsync_len = vm->hsync_len;
+
+ fbmode->yres = vm->vactive;
+ fbmode->upper_margin = vm->vback_porch;
+ fbmode->lower_margin = vm->vfront_porch;
+ fbmode->vsync_len = vm->vsync_len;
+
+ fbmode->pixclock = KHZ2PICOS(vm->pixelclock / 1000);
+
+ fbmode->sync = 0;
+ fbmode->vmode = 0;
+ if (vm->hah)
+ fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
+ if (vm->vah)
+ fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
+ if (vm->interlaced)
+ fbmode->vmode |= FB_VMODE_INTERLACED;
+ if (vm->doublescan)
+ fbmode->vmode |= FB_VMODE_DOUBLE;
+ if (vm->de)
+ fbmode->sync |= FB_SYNC_DATA_ENABLE_HIGH_ACT;
+ fbmode->refresh = 60;
+ fbmode->flag = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(videomode_to_fb_videomode);
+#endif
+
+
#else
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
{
diff --git a/include/linux/fb.h b/include/linux/fb.h
index c7a9571..46c665b 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -714,6 +714,8 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
+extern int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode);
+
/* drivers/video/modedb.c */
#define VESA_MODEDB_SIZE 34
extern void fb_var_to_videomode(struct fb_videomode *mode,
--
1.7.10.4
^ permalink raw reply related
* [PATCH v8 2/6] video: add of helper for videomode
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Philipp Zabel, Rob Herring, linux-fbdev,
dri-devel, Laurent Pinchart, Thierry Reding,
Guennady Liakhovetski, linux-media, Tomi Valkeinen,
Stephen Warren, kernel
In-Reply-To: <1352734626-27412-1-git-send-email-s.trumtrar@pengutronix.de>
This adds support for reading display timings from DT or/and convert one of those
timings to a videomode.
The of_display_timing implementation supports multiple children where each
property can have up to 3 values. All children are read into an array, that
can be queried.
of_get_videomode converts exactly one of that timings to a struct videomode.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
.../devicetree/bindings/video/display-timings.txt | 107 +++++++++++
drivers/video/Kconfig | 13 ++
drivers/video/Makefile | 2 +
drivers/video/of_display_timing.c | 186 ++++++++++++++++++++
drivers/video/of_videomode.c | 47 +++++
include/linux/of_display_timings.h | 19 ++
include/linux/of_videomode.h | 15 ++
7 files changed, 389 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/display-timings.txt
create mode 100644 drivers/video/of_display_timing.c
create mode 100644 drivers/video/of_videomode.c
create mode 100644 include/linux/of_display_timings.h
create mode 100644 include/linux/of_videomode.h
diff --git a/Documentation/devicetree/bindings/video/display-timings.txt b/Documentation/devicetree/bindings/video/display-timings.txt
new file mode 100644
index 0000000..e22e2fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/display-timings.txt
@@ -0,0 +1,107 @@
+display-timings bindings
+============
+
+display-timings-node
+--------------------
+
+required properties:
+ - none
+
+optional properties:
+ - native-mode: the native mode for the display, in case multiple modes are
+ provided. When omitted, assume the first node is the native.
+
+timings-subnode
+---------------
+
+required properties:
+ - hactive, vactive: Display resolution
+ - hfront-porch, hback-porch, hsync-len: Horizontal Display timing parameters
+ in pixels
+ vfront-porch, vback-porch, vsync-len: Vertical display timing parameters in
+ lines
+ - clock-frequency: displayclock in Hz
+
+optional properties:
+ - hsync-active : Hsync pulse is active low/high/ignored
+ - vsync-active : Vsync pulse is active low/high/ignored
+ - de-active : Data-Enable pulse is active low/high/ignored
+ - pixelclk-inverted : pixelclock is inverted/non-inverted/ignored
+ - interlaced (bool)
+ - doublescan (bool)
+
+All the optional properties that are not bool follow the following logic:
+ <1> : high active
+ <0> : low active
+ omitted : not used on hardware
+
+There are different ways of describing the capabilities of a display. The devicetree
+representation corresponds to the one commonly found in datasheets for displays.
+If a display supports multiple signal timings, the native-mode can be specified.
+
+The parameters are defined as
+
+struct display_timing
+==========+
+ +----------+---------------------------------------------+----------+-------+
+ | | ↑ | | |
+ | | |vback_porch | | |
+ | | ↓ | | |
+ +----------###############################################----------+-------+
+ | # ↑ # | |
+ | # | # | |
+ | hback # | # hfront | hsync |
+ | porch # | hactive # porch | len |
+ |<-------->#<---------------+--------------------------->#<-------->|<----->|
+ | # | # | |
+ | # |vactive # | |
+ | # | # | |
+ | # ↓ # | |
+ +----------###############################################----------+-------+
+ | | ↑ | | |
+ | | |vfront_porch | | |
+ | | ↓ | | |
+ +----------+---------------------------------------------+----------+-------+
+ | | ↑ | | |
+ | | |vsync_len | | |
+ | | ↓ | | |
+ +----------+---------------------------------------------+----------+-------+
+
+
+Example:
+
+ display-timings {
+ native-mode = <&timing0>;
+ timing0: 1920p24 {
+ /* 1920x1080p24 */
+ clock-frequency = <52000000>;
+ hactive = <1920>;
+ vactive = <1080>;
+ hfront-porch = <25>;
+ hback-porch = <25>;
+ hsync-len = <25>;
+ vback-porch = <2>;
+ vfront-porch = <2>;
+ vsync-len = <2>;
+ hsync-active = <1>;
+ };
+ };
+
+Every required property also supports the use of ranges, so the commonly used
+datasheet description with <min typ max>-tuples can be used.
+
+Example:
+
+ timing1: timing {
+ /* 1920x1080p24 */
+ clock-frequency = <148500000>;
+ hactive = <1920>;
+ vactive = <1080>;
+ hsync-len = <0 44 60>;
+ hfront-porch = <80 88 95>;
+ hback-porch = <100 148 160>;
+ vfront-porch = <0 4 6>;
+ vback-porch = <0 36 50>;
+ vsync-len = <0 5 6>;
+ };
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 2a23b18..a324457 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -39,6 +39,19 @@ config DISPLAY_TIMING
config VIDEOMODE
bool
+config OF_DISPLAY_TIMING
+ def_bool y
+ select DISPLAY_TIMING
+ help
+ helper to parse display timings from the devicetree
+
+config OF_VIDEOMODE
+ def_bool y
+ select VIDEOMODE
+ select OF_DISPLAY_TIMING
+ help
+ helper to get videomodes from the devicetree
+
menuconfig FB
tristate "Support for frame buffer devices"
---help---
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index fc30439..b936b00 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -168,4 +168,6 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o
#video output switch sysfs driver
obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
+obj-$(CONFIG_OF_DISPLAY_TIMING) += of_display_timing.o
obj-$(CONFIG_VIDEOMODE) += videomode.o
+obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o
diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
new file mode 100644
index 0000000..0bd30cc
--- /dev/null
+++ b/drivers/video/of_display_timing.c
@@ -0,0 +1,186 @@
+/*
+ * OF helpers for parsing display timings
+ *
+ * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
+ *
+ * based on of_videomode.c by Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This file is released under the GPLv2
+ */
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/of_display_timings.h>
+
+/**
+ * parse_property - parse timing_entry from device_node
+ * @np: device_node with the property
+ * @name: name of the property
+ * @result: will be set to the return value
+ *
+ * DESCRIPTION:
+ * Every display_timing can be specified with either just the typical value or
+ * a range consisting of min/typ/max. This function helps handling this
+ **/
+static int parse_property(struct device_node *np, char *name,
+ struct timing_entry *result)
+{
+ struct property *prop;
+ int length, cells, ret;
+
+ prop = of_find_property(np, name, &length);
+ if (!prop) {
+ pr_err("%s: could not find property %s\n", __func__, name);
+ return -EINVAL;
+ }
+
+ cells = length / sizeof(u32);
+ if (cells = 1) {
+ ret = of_property_read_u32(np, name, &result->typ);
+ result->min = result->typ;
+ result->max = result->typ;
+ } else if (cells = 3) {
+ ret = of_property_read_u32_array(np, name, &result->min, cells);
+ } else {
+ pr_err("%s: illegal timing specification in %s\n", __func__, name);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+/**
+ * of_get_display_timing - parse display_timing entry from device_node
+ * @np: device_node with the properties
+ **/
+static struct display_timing *of_get_display_timing(struct device_node *np)
+{
+ struct display_timing *dt;
+ int ret = 0;
+
+ dt = kzalloc(sizeof(*dt), GFP_KERNEL);
+ if (!dt) {
+ pr_err("%s: could not allocate display_timing struct\n", __func__);
+ return NULL;
+ }
+
+ ret |= parse_property(np, "hback-porch", &dt->hback_porch);
+ ret |= parse_property(np, "hfront-porch", &dt->hfront_porch);
+ ret |= parse_property(np, "hactive", &dt->hactive);
+ ret |= parse_property(np, "hsync-len", &dt->hsync_len);
+ ret |= parse_property(np, "vback-porch", &dt->vback_porch);
+ ret |= parse_property(np, "vfront-porch", &dt->vfront_porch);
+ ret |= parse_property(np, "vactive", &dt->vactive);
+ ret |= parse_property(np, "vsync-len", &dt->vsync_len);
+ ret |= parse_property(np, "clock-frequency", &dt->pixelclock);
+
+ of_property_read_u32(np, "vsync-active", &dt->vsync_pol_active);
+ of_property_read_u32(np, "hsync-active", &dt->hsync_pol_active);
+ of_property_read_u32(np, "de-active", &dt->de_pol_active);
+ of_property_read_u32(np, "pixelclk-inverted", &dt->pixelclk_pol);
+ dt->interlaced = of_property_read_bool(np, "interlaced");
+ dt->doublescan = of_property_read_bool(np, "doublescan");
+
+ if (ret) {
+ pr_err("%s: error reading timing properties\n", __func__);
+ return NULL;
+ }
+
+ return dt;
+}
+
+/**
+ * of_get_display_timings - parse all display_timing entries from a device_node
+ * @np: device_node with the subnodes
+ **/
+struct display_timings *of_get_display_timings(struct device_node *np)
+{
+ struct device_node *timings_np;
+ struct device_node *entry;
+ struct device_node *native_mode;
+ struct display_timings *disp;
+
+ if (!np) {
+ pr_err("%s: no devicenode given\n", __func__);
+ return NULL;
+ }
+
+ timings_np = of_find_node_by_name(np, "display-timings");
+ if (!timings_np) {
+ pr_err("%s: could not find display-timings node\n", __func__);
+ return NULL;
+ }
+
+ disp = kzalloc(sizeof(*disp), GFP_KERNEL);
+ if (!disp)
+ return -ENOMEM;
+
+ entry = of_parse_phandle(timings_np, "native-mode", 0);
+ /* assume first child as native mode if none provided */
+ if (!entry)
+ entry = of_get_next_child(np, NULL);
+ if (!entry) {
+ pr_err("%s: no timing specifications given\n", __func__);
+ return NULL;
+ }
+
+ pr_info("%s: using %s as default timing\n", __func__, entry->name);
+
+ native_mode = entry;
+
+ disp->num_timings = of_get_child_count(timings_np);
+ disp->timings = kzalloc(sizeof(struct display_timing *)*disp->num_timings,
+ GFP_KERNEL);
+ if (!disp->timings)
+ return -ENOMEM;
+
+ disp->num_timings = 0;
+ disp->native_mode = 0;
+
+ for_each_child_of_node(timings_np, entry) {
+ struct display_timing *dt;
+
+ dt = of_get_display_timing(entry);
+ if (!dt) {
+ /* to not encourage wrong devicetrees, fail in case of an error */
+ pr_err("%s: error in timing %d\n", __func__, disp->num_timings+1);
+ return NULL;
+ }
+
+ if (native_mode = entry)
+ disp->native_mode = disp->num_timings;
+
+ disp->timings[disp->num_timings] = dt;
+ disp->num_timings++;
+ }
+ of_node_put(timings_np);
+
+ if (disp->num_timings > 0)
+ pr_info("%s: got %d timings. Using timing #%d as default\n", __func__,
+ disp->num_timings , disp->native_mode + 1);
+ else {
+ pr_err("%s: no valid timings specified\n", __func__);
+ return NULL;
+ }
+ return disp;
+}
+EXPORT_SYMBOL_GPL(of_get_display_timings);
+
+/**
+ * of_display_timings_exists - check if a display-timings node is provided
+ * @np: device_node with the timing
+ **/
+int of_display_timings_exists(struct device_node *np)
+{
+ struct device_node *timings_np;
+
+ if (!np)
+ return -EINVAL;
+
+ timings_np = of_parse_phandle(np, "display-timings", 0);
+ if (!timings_np)
+ return -EINVAL;
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(of_display_timings_exists);
diff --git a/drivers/video/of_videomode.c b/drivers/video/of_videomode.c
new file mode 100644
index 0000000..7051701
--- /dev/null
+++ b/drivers/video/of_videomode.c
@@ -0,0 +1,47 @@
+/*
+ * generic videomode helper
+ *
+ * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
+ *
+ * This file is released under the GPLv2
+ */
+#include <linux/of.h>
+#include <linux/of_display_timings.h>
+#include <linux/of_videomode.h>
+#include <linux/export.h>
+
+/**
+ * of_get_videomode - get the videomode #<index> from devicetree
+ * @np - devicenode with the display_timings
+ * @vm - set to return value
+ * @index - index into list of display_timings
+ * DESCRIPTION:
+ * Get a list of all display timings and put the one
+ * specified by index into *vm. This function should only be used, if
+ * only one videomode is to be retrieved. A driver that needs to work
+ * with multiple/all videomodes should work with
+ * of_get_display_timings instead.
+ **/
+int of_get_videomode(struct device_node *np, struct videomode *vm, int index)
+{
+ struct display_timings *disp;
+ int ret;
+
+ disp = of_get_display_timings(np);
+ if (!disp) {
+ pr_err("%s: no timings specified\n", __func__);
+ return -EINVAL;
+ }
+
+ if (index = OF_USE_NATIVE_MODE)
+ index = disp->native_mode;
+
+ ret = videomode_from_timing(disp, vm, index);
+ if (ret)
+ return ret;
+
+ display_timings_release(disp);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_get_videomode);
diff --git a/include/linux/of_display_timings.h b/include/linux/of_display_timings.h
new file mode 100644
index 0000000..ccf6814
--- /dev/null
+++ b/include/linux/of_display_timings.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ *
+ * display timings of helpers
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_OF_DISPLAY_TIMINGS_H
+#define __LINUX_OF_DISPLAY_TIMINGS_H
+
+#include <linux/display_timing.h>
+
+#define OF_USE_NATIVE_MODE -1
+
+struct display_timings *of_get_display_timings(struct device_node *np);
+int of_display_timings_exists(struct device_node *np);
+
+#endif
diff --git a/include/linux/of_videomode.h b/include/linux/of_videomode.h
new file mode 100644
index 0000000..01518e6
--- /dev/null
+++ b/include/linux/of_videomode.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ *
+ * videomode of-helpers
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_OF_VIDEOMODE_H
+#define __LINUX_OF_VIDEOMODE_H
+
+#include <linux/videomode.h>
+
+int of_get_videomode(struct device_node *np, struct videomode *vm, int index);
+#endif /* __LINUX_OF_VIDEOMODE_H */
--
1.7.10.4
^ permalink raw reply related
* [PATCH v8 1/6] video: add display_timing and videomode
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Thierry Reding, Guennady Liakhovetski,
linux-media, Tomi Valkeinen, Stephen Warren, kernel
In-Reply-To: <1352734626-27412-1-git-send-email-s.trumtrar@pengutronix.de>
Add display_timing structure and the according helper functions. This allows
the description of a display via its supported timing parameters.
Every timing parameter can be specified as a single value or a range
<min typ max>.
Also, add helper functions to convert from display timings to a generic videomode
structure. This videomode can then be converted to the corresponding subsystem
mode representation (e.g. fb_videomode).
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
drivers/video/Kconfig | 6 ++++
drivers/video/Makefile | 2 ++
drivers/video/display_timing.c | 22 +++++++++++++
drivers/video/videomode.c | 45 ++++++++++++++++++++++++++
include/linux/display_timing.h | 69 ++++++++++++++++++++++++++++++++++++++++
include/linux/videomode.h | 39 +++++++++++++++++++++++
6 files changed, 183 insertions(+)
create mode 100644 drivers/video/display_timing.c
create mode 100644 drivers/video/videomode.c
create mode 100644 include/linux/display_timing.h
create mode 100644 include/linux/videomode.h
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index d08d799..2a23b18 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -33,6 +33,12 @@ config VIDEO_OUTPUT_CONTROL
This framework adds support for low-level control of the video
output switch.
+config DISPLAY_TIMING
+ bool
+
+config VIDEOMODE
+ bool
+
menuconfig FB
tristate "Support for frame buffer devices"
---help---
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 23e948e..fc30439 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -167,3 +167,5 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o
#video output switch sysfs driver
obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
+obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
+obj-$(CONFIG_VIDEOMODE) += videomode.o
diff --git a/drivers/video/display_timing.c b/drivers/video/display_timing.c
new file mode 100644
index 0000000..04b7b69
--- /dev/null
+++ b/drivers/video/display_timing.c
@@ -0,0 +1,22 @@
+/*
+ * generic display timing functions
+ *
+ * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
+ *
+ * This file is released under the GPLv2
+ */
+
+#include <linux/display_timing.h>
+#include <linux/slab.h>
+
+void display_timings_release(struct display_timings *disp)
+{
+ if (disp->timings) {
+ unsigned int i;
+
+ for (i = 0; i < disp->num_timings; i++)
+ kfree(disp->timings[i]);
+ kfree(disp->timings);
+ }
+ kfree(disp);
+}
diff --git a/drivers/video/videomode.c b/drivers/video/videomode.c
new file mode 100644
index 0000000..087374a
--- /dev/null
+++ b/drivers/video/videomode.c
@@ -0,0 +1,45 @@
+/*
+ * generic display timing functions
+ *
+ * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
+ *
+ * This file is released under the GPLv2
+ */
+
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/display_timing.h>
+#include <linux/kernel.h>
+#include <linux/videomode.h>
+
+int videomode_from_timing(struct display_timings *disp, struct videomode *vm,
+ unsigned int index)
+{
+ struct display_timing *dt;
+
+ dt = display_timings_get(disp, index);
+ if (!dt)
+ return -EINVAL;
+
+ vm->pixelclock = display_timing_get_value(&dt->pixelclock, 0);
+ vm->hactive = display_timing_get_value(&dt->hactive, 0);
+ vm->hfront_porch = display_timing_get_value(&dt->hfront_porch, 0);
+ vm->hback_porch = display_timing_get_value(&dt->hback_porch, 0);
+ vm->hsync_len = display_timing_get_value(&dt->hsync_len, 0);
+
+ vm->vactive = display_timing_get_value(&dt->vactive, 0);
+ vm->vfront_porch = display_timing_get_value(&dt->vfront_porch, 0);
+ vm->vback_porch = display_timing_get_value(&dt->vback_porch, 0);
+ vm->vsync_len = display_timing_get_value(&dt->vsync_len, 0);
+
+ vm->vah = dt->vsync_pol_active;
+ vm->hah = dt->hsync_pol_active;
+ vm->de = dt->de_pol_active;
+ vm->pixelclk_pol = dt->pixelclk_pol;
+
+ vm->interlaced = dt->interlaced;
+ vm->doublescan = dt->doublescan;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(videomode_from_timing);
diff --git a/include/linux/display_timing.h b/include/linux/display_timing.h
new file mode 100644
index 0000000..0ed2a1e
--- /dev/null
+++ b/include/linux/display_timing.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ *
+ * description of display timings
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_DISPLAY_TIMINGS_H
+#define __LINUX_DISPLAY_TIMINGS_H
+
+#include <linux/types.h>
+
+struct timing_entry {
+ u32 min;
+ u32 typ;
+ u32 max;
+};
+
+struct display_timing {
+ struct timing_entry pixelclock;
+
+ struct timing_entry hactive;
+ struct timing_entry hfront_porch;
+ struct timing_entry hback_porch;
+ struct timing_entry hsync_len;
+
+ struct timing_entry vactive;
+ struct timing_entry vfront_porch;
+ struct timing_entry vback_porch;
+ struct timing_entry vsync_len;
+
+ unsigned int vsync_pol_active;
+ unsigned int hsync_pol_active;
+ unsigned int de_pol_active;
+ unsigned int pixelclk_pol;
+ bool interlaced;
+ bool doublescan;
+};
+
+struct display_timings {
+ unsigned int num_timings;
+ unsigned int native_mode;
+
+ struct display_timing **timings;
+};
+
+/* placeholder function until ranges are really needed
+ * the index parameter should then be used to select one of [min typ max]
+ */
+static inline u32 display_timing_get_value(struct timing_entry *te,
+ unsigned int index)
+{
+ return te->typ;
+}
+
+static inline struct display_timing *display_timings_get(struct display_timings *disp,
+ unsigned int index)
+{
+ if (disp->num_timings > index)
+ return disp->timings[index];
+ else
+ return NULL;
+}
+
+void timings_release(struct display_timings *disp);
+void display_timings_release(struct display_timings *disp);
+
+#endif
diff --git a/include/linux/videomode.h b/include/linux/videomode.h
new file mode 100644
index 0000000..0b87fbb
--- /dev/null
+++ b/include/linux/videomode.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ *
+ * generic videomode description
+ *
+ * This file is released under the GPLv2
+ */
+
+#ifndef __LINUX_VIDEOMODE_H
+#define __LINUX_VIDEOMODE_H
+
+#include <linux/display_timing.h>
+
+struct videomode {
+ u32 pixelclock;
+ u32 refreshrate;
+
+ u32 hactive;
+ u32 hfront_porch;
+ u32 hback_porch;
+ u32 hsync_len;
+
+ u32 vactive;
+ u32 vfront_porch;
+ u32 vback_porch;
+ u32 vsync_len;
+
+ u32 hah;
+ u32 vah;
+ u32 de;
+ u32 pixelclk_pol;
+
+ bool interlaced;
+ bool doublescan;
+};
+
+int videomode_from_timing(struct display_timings *disp, struct videomode *vm,
+ unsigned int index);
+#endif
--
1.7.10.4
^ permalink raw reply related
* [PATCH v8 0/6] of: add display helper
From: Steffen Trumtrar @ 2012-11-12 15:37 UTC (permalink / raw)
To: devicetree-discuss
Cc: Steffen Trumtrar, Rob Herring, linux-fbdev, dri-devel,
Laurent Pinchart, Thierry Reding, Guennady Liakhovetski,
linux-media, Tomi Valkeinen, Stephen Warren, kernel
Hi!
This is v8 of the display helper series
Changes since v7:
- move of_xxx to drivers/video
- remove non-binding documentation from display-timings.txt
- squash display_timings and videomode in one patch
- misc minor fixes
Regards,
Steffen
Steffen Trumtrar (6):
video: add display_timing and videomode
video: add of helper for videomode
fbmon: add videomode helpers
fbmon: add of_videomode helpers
drm_modes: add videomode helpers
drm_modes: add of_videomode helpers
.../devicetree/bindings/video/display-timings.txt | 107 +++++++++++
drivers/gpu/drm/drm_modes.c | 77 ++++++++
drivers/video/Kconfig | 19 ++
drivers/video/Makefile | 4 +
drivers/video/display_timing.c | 22 +++
drivers/video/fbmon.c | 77 ++++++++
drivers/video/of_display_timing.c | 186 ++++++++++++++++++++
drivers/video/of_videomode.c | 47 +++++
drivers/video/videomode.c | 45 +++++
include/drm/drmP.h | 8 +
include/linux/display_timing.h | 69 ++++++++
include/linux/fb.h | 5 +
include/linux/of_display_timings.h | 19 ++
include/linux/of_videomode.h | 15 ++
include/linux/videomode.h | 39 ++++
15 files changed, 739 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/display-timings.txt
create mode 100644 drivers/video/display_timing.c
create mode 100644 drivers/video/of_display_timing.c
create mode 100644 drivers/video/of_videomode.c
create mode 100644 drivers/video/videomode.c
create mode 100644 include/linux/display_timing.h
create mode 100644 include/linux/of_display_timings.h
create mode 100644 include/linux/of_videomode.h
create mode 100644 include/linux/videomode.h
--
1.7.10.4
^ permalink raw reply
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