[PATCH v2 0/5] Driver for pre-DCP apple display controller.

[PATCH v2 0/5] Driver for pre-DCP apple display controller.

[Sasha Finkelstein via B4 Relay]

Hi.

This patch series adds support for a secondary display controller
present on Apple M1/M2 chips and used to drive the display of the
"touchbar" touch panel present on those. 

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
Changes in v2:
- Addressing the review feedback.
- Split out the mipi part of the display controller into a separate device
- Link to v1: https://lore.kernel.org/r/20241124-adpdrm-v1-0-3191d8e6e49a@gmail.com

---
Sasha Finkelstein (5):
      dt-bindings: display: Add Apple pre-DCP display controller bindings
      drm: adp: Add Apple Display Pipe driver
      drm: panel: Add a panel driver for the Summit display
      arm64: dts: apple: Add touchbar screen nodes
      MAINTAINERS: Add entries for touchbar display driver

 .../display/apple,h7-display-pipe-mipi.yaml        |  89 +++
 .../bindings/display/apple,h7-display-pipe.yaml    |  77 +++
 .../bindings/display/panel/apple,summit.yaml       |  58 ++
 MAINTAINERS                                        |   5 +
 arch/arm64/boot/dts/apple/t8103-j293.dts           |  31 ++
 arch/arm64/boot/dts/apple/t8103.dtsi               |  61 +++
 arch/arm64/boot/dts/apple/t8112-j493.dts           |  31 ++
 arch/arm64/boot/dts/apple/t8112.dtsi               |  62 +++
 drivers/gpu/drm/Kconfig                            |   2 +
 drivers/gpu/drm/Makefile                           |   1 +
 drivers/gpu/drm/adp/Kconfig                        |  16 +
 drivers/gpu/drm/adp/Makefile                       |   4 +
 drivers/gpu/drm/adp/adp-mipi.c                     | 251 +++++++++
 drivers/gpu/drm/adp/adp_drv.c                      | 594 +++++++++++++++++++++
 drivers/gpu/drm/panel/Kconfig                      |   9 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-summit.c               | 143 +++++
 17 files changed, 1435 insertions(+)
---
base-commit: 9f16d5e6f220661f73b36a4be1b21575651d8833
change-id: 20241124-adpdrm-25fce3dd8a71

[PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Sasha Finkelstein via B4 Relay]

From: Sasha Finkelstein <fnkl.kernel@gmail.com>

Add bindings for a secondary display controller present on certain
Apple laptops.

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
 .../display/apple,h7-display-pipe-mipi.yaml        | 89 ++++++++++++++++++++++
 .../bindings/display/apple,h7-display-pipe.yaml    | 77 +++++++++++++++++++
 .../bindings/display/panel/apple,summit.yaml       | 58 ++++++++++++++
 3 files changed, 224 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml b/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..2cf2f50e9fc7329a5b424d5ddf8c34cad2ebb6be
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/apple,h7-display-pipe-mipi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple pre-DCP display controller MIPI interface.
+
+maintainers:
+  - asahi@lists.linux.dev
+  - Sasha Finkelstein <fnkl.kernel@gmail.com>
+
+description:
+  The MIPI controller part of the pre-DCP Apple display controller
+
+allOf:
+  - $ref: dsi-controller.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8112-display-pipe-mipi
+          - apple,t8103-display-pipe-mipi
+      - const: apple,h7-display-pipe-mipi
+
+  reg:
+    maxItems: 1
+
+  reg-names:
+    const: mipi
+
+  power-domains:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+
+    required:
+      - port@0
+      - port@1
+
+  '#address-cells': true
+
+  '#size-cells': true
+
+patternProperties:
+  "^panel@[0-3]$": true
+
+required:
+  - compatible
+  - reg
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    display_dfr: dsi@228200000 {
+    	compatible = "apple,t8103-display-pipe-mipi", "apple,h7-display-pipe-mipi";
+    	reg-names = "mipi";
+    	reg = <0x28200000 0xc000>;
+    	power-domains = <&ps_dispdfr_mipi>;
+
+    	ports {
+    		#address-cells = <1>;
+    		#size-cells = <0>;
+
+    		dfr_mipi_in: port@0 {
+    			#address-cells = <1>;
+    			#size-cells = <0>;
+    			reg = <0>;
+    		};
+
+    		dfr_mipi_out: port@1 {
+    			#address-cells = <1>;
+    			#size-cells = <0>;
+    			reg = <1>;
+    		};
+    	};
+    };
+...
diff --git a/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml b/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..98982da9c5f672167d67e4cd3b47e1fbdafc9510
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/apple,h7-display-pipe.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple pre-DCP display controller.
+
+maintainers:
+  - asahi@lists.linux.dev
+  - Sasha Finkelstein <fnkl.kernel@gmail.com>
+
+description:
+  A secondary display controller used to drive the "touchbar" on certain Apple laptops.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8112-display-pipe
+          - apple,t8103-display-pipe
+      - const: apple,h7-display-pipe
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: be
+      - const: fe
+
+  power-domains:
+    maxItems: 2
+
+  interrupts:
+    maxItems: 2
+
+  interrupt-names:
+    items:
+      - const: be
+      - const: fe
+
+  iommus:
+    maxItems: 1
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/apple-aic.h>
+    display_dfr: display-pipe@228200000 {
+    	compatible = "apple,t8103-display-pipe", "apple,h7-display-pipe";
+    	reg-names = "be", "fe";
+    	reg = <0x28200000 0xc000>,
+    		<0x28400000 0x4000>;
+    	power-domains = <&ps_dispdfr_fe>, <&ps_dispdfr_be>;
+    	interrupt-parent = <&aic>;
+    	interrupts = <AIC_IRQ 502 IRQ_TYPE_LEVEL_HIGH>,
+    		<AIC_IRQ 506 IRQ_TYPE_LEVEL_HIGH>;
+    	interrupt-names = "be", "fe";
+    	iommus = <&displaydfr_dart 0>;
+    	port {
+    		dfr_adp_out_mipi: endpoint {
+    			remote-endpoint = <&dfr_mipi_in_adp>;
+    		};
+    	};
+    };
+...
diff --git a/Documentation/devicetree/bindings/display/panel/apple,summit.yaml b/Documentation/devicetree/bindings/display/panel/apple,summit.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..db14f7af3787076c84ccdda08fedeb8912d5514d
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/apple,summit.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/apple,summit.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple "Summit" display panel.
+
+maintainers:
+  - asahi@lists.linux.dev
+  - Sasha Finkelstein <fnkl.kernel@gmail.com>
+
+allOf:
+  - $ref: panel-common.yaml#
+  - $ref: /schemas/leds/backlight/common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,j293-summit
+          - apple,j493-summit
+      - const: apple,summit
+
+  reg:
+    maxItems: 1
+
+  max-brightness: true
+
+  port: true
+
+required:
+  - compatible
+  - reg
+  - max-brightness
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    dsi {
+    	#address-cells = <1>;
+    	#size-cells = <0>;
+
+    	panel@0 {
+    		compatible = "apple,j293-summit", "apple,summit";
+    		reg = <0>;
+    		max-brightness = <255>;
+
+    		port {
+    			dfr_panel_in: endpoint {
+    				remote-endpoint = <&dfr_bridge_out>;
+    			};
+    		};
+    	};
+    };
+...

-- 
2.47.1

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Krzysztof Kozlowski]

On 26/11/2024 17:34, Sasha Finkelstein via B4 Relay wrote:
> From: Sasha Finkelstein <fnkl.kernel@gmail.com>
> 
> Add bindings for a secondary display controller present on certain
> Apple laptops.
> 

A nit, subject: drop second/last, redundant "bindings". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18


> Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
> ---
>  .../display/apple,h7-display-pipe-mipi.yaml        | 89 ++++++++++++++++++++++
>  .../bindings/display/apple,h7-display-pipe.yaml    | 77 +++++++++++++++++++
>  .../bindings/display/panel/apple,summit.yaml       | 58 ++++++++++++++
>  3 files changed, 224 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml b/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..2cf2f50e9fc7329a5b424d5ddf8c34cad2ebb6be
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
> @@ -0,0 +1,89 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/apple,h7-display-pipe-mipi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple pre-DCP display controller MIPI interface.

Drop final stop, that's a title so it could be capitalized, but anyway
it is not a sentence

> +
> +maintainers:
> +  - asahi@lists.linux.dev

Drop, maintainer boxes are not allowed for bindings.

> +  - Sasha Finkelstein <fnkl.kernel@gmail.com>
> +
> +description:
> +  The MIPI controller part of the pre-DCP Apple display controller
> +
> +allOf:
> +  - $ref: dsi-controller.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - apple,t8112-display-pipe-mipi
> +          - apple,t8103-display-pipe-mipi
> +      - const: apple,h7-display-pipe-mipi
> +
> +  reg:
> +    maxItems: 1
> +
> +  reg-names:
> +    const: mipi
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +
> +    required:
> +      - port@0
> +      - port@1

Please take a look how other bindings define ports. You miss here
several items and more important - description what are these ports for.

> +
> +  '#address-cells': true
> +
> +  '#size-cells': true
> +
> +patternProperties:
> +  "^panel@[0-3]$": true

These look unusual. Is this a DSI controller? If so, then reference
dsi-controller. See other bindings how this is done.


> +
> +required:
> +  - compatible
> +  - reg
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    display_dfr: dsi@228200000 {

Drop unused label

> +    	compatible = "apple,t8103-display-pipe-mipi", "apple,h7-display-pipe-mipi";
> +    	reg-names = "mipi";
> +    	reg = <0x28200000 0xc000>;

Order fields according to DTS coding style.

> +    	power-domains = <&ps_dispdfr_mipi>;
> +
> +    	ports {
> +    		#address-cells = <1>;

Messed indentation. Use 4 spaces for example indentation.


> +    		#size-cells = <0>;
> +
> +    		dfr_mipi_in: port@0 {
> +    			#address-cells = <1>;
> +    			#size-cells = <0>;
> +    			reg = <0>;
> +    		};
> +
> +    		dfr_mipi_out: port@1 {
> +    			#address-cells = <1>;
> +    			#size-cells = <0>;
> +    			reg = <1>;
> +    		};
> +    	};
> +    };
> +...
> diff --git a/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml b/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..98982da9c5f672167d67e4cd3b47e1fbdafc9510
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/apple,h7-display-pipe.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple pre-DCP display controller.
> +
> +maintainers:
> +  - asahi@lists.linux.dev
> +  - Sasha Finkelstein <fnkl.kernel@gmail.com>
> +
> +description:
> +  A secondary display controller used to drive the "touchbar" on certain Apple laptops.

Please wrap code according to coding style (checkpatch is not a coding
style description, but only a tool).


> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - apple,t8112-display-pipe
> +          - apple,t8103-display-pipe
> +      - const: apple,h7-display-pipe
> +
> +  reg:
> +    maxItems: 2

List and describe the items instead, because be and fe are a bit cryptic.

> +
> +  reg-names:
> +    items:
> +      - const: be
> +      - const: fe
> +
> +  power-domains:
> +    maxItems: 2

Need to list the items instead.

> +
> +  interrupts:
> +    maxItems: 2

Ditto

> +
> +  interrupt-names:
> +    items:
> +      - const: be
> +      - const: fe
> +
> +  iommus:
> +    maxItems: 1
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/apple-aic.h>
> +    display_dfr: display-pipe@228200000 {

Drop unused label.

> +    	compatible = "apple,t8103-display-pipe", "apple,h7-display-pipe";
> +    	reg-names = "be", "fe";
> +    	reg = <0x28200000 0xc000>,
> +    		<0x28400000 0x4000>;

Messed alignment, in other places as well.

> +    	power-domains = <&ps_dispdfr_fe>, <&ps_dispdfr_be>;
> +    	interrupt-parent = <&aic>;
> +    	interrupts = <AIC_IRQ 502 IRQ_TYPE_LEVEL_HIGH>,
> +    		<AIC_IRQ 506 IRQ_TYPE_LEVEL_HIGH>;
> +    	interrupt-names = "be", "fe";
> +    	iommus = <&displaydfr_dart 0>;
> +    	port {
> +    		dfr_adp_out_mipi: endpoint {

Messed indentation.

> +    			remote-endpoint = <&dfr_mipi_in_adp>;
> +    		};
> +    	};
> +    };
> +...
> diff --git a/Documentation/devicetree/bindings/display/panel/apple,summit.yaml b/Documentation/devicetree/bindings/display/panel/apple,summit.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..db14f7af3787076c84ccdda08fedeb8912d5514d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/apple,summit.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/apple,summit.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple "Summit" display panel.
> +
> +maintainers:
> +  - asahi@lists.linux.dev
> +  - Sasha Finkelstein <fnkl.kernel@gmail.com>
> +
> +allOf:
> +  - $ref: panel-common.yaml#
> +  - $ref: /schemas/leds/backlight/common.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - apple,j293-summit
> +          - apple,j493-summit
> +      - const: apple,summit

Summit tells me nothing - no description, title repeats it, so I suggest
using device specific compatible.

> +
> +  reg:
> +    maxItems: 1
> +
> +  max-brightness: true
> +
> +  port: true

No, these cannot be true without definition. Again, please open existing
bindings and use them as example. You probably miss here some reference,
but max-brightness for panel is a bit confusing. I asked already and did
not get answer: isn't this backlight property? What is this device -
backlight or panel? If panel, then what bus?


Best regards,
Krzysztof

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Krzysztof Kozlowski]

On 26/11/2024 17:46, Krzysztof Kozlowski wrote:
> 
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  max-brightness: true
>> +
>> +  port: true
> 
> No, these cannot be true without definition. Again, please open existing
> bindings and use them as example. You probably miss here some reference,
> but max-brightness for panel is a bit confusing. I asked already and did
> not get answer: isn't this backlight property? What is this device -
> backlight or panel? If panel, then what bus?
You responded to my comment in exactly the same moment you sent this
patchset which gives me around 0 seconds to reply to your comment.

Give reviewers some time if you disagree with them, otherwise I find
wrong sending next version immediately.

Best regards,
Krzysztof

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Sasha Finkelstein]

On Tue, 26 Nov 2024 at 17:46, Krzysztof Kozlowski <krzk@kernel.org> wrote:
> > +allOf:
> > +  - $ref: dsi-controller.yaml#
...
> > +patternProperties:
> > +  "^panel@[0-3]$": true
>
> These look unusual. Is this a DSI controller? If so, then reference
> dsi-controller. See other bindings how this is done.

This is a DSI controller, as referenced above. Those properties are from
dsi-controller.yaml

> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - apple,j293-summit
> > +          - apple,j493-summit
> > +      - const: apple,summit
>
> Summit tells me nothing - no description, title repeats it, so I suggest
> using device specific compatible.

The j293/j493 are the device-specific compatibles, those are chassis names
for the specific laptops the panel is present in.


> No, these cannot be true without definition. Again, please open existing
> bindings and use them as example. You probably miss here some reference,
> but max-brightness for panel is a bit confusing. I asked already and did
> not get answer: isn't this backlight property? What is this device -
> backlight or panel? If panel, then what bus?

Per my response on previous version, it's both, kind of. This is a
self-emissive panel on
a mipi-dsi bus, which can change brightness in response to mipi dcs
backlight commands.

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Krzysztof Kozlowski]

On 26/11/2024 18:00, Sasha Finkelstein wrote:
> On Tue, 26 Nov 2024 at 17:46, Krzysztof Kozlowski <krzk@kernel.org> wrote:
>>> +allOf:
>>> +  - $ref: dsi-controller.yaml#
> ...
>>> +patternProperties:
>>> +  "^panel@[0-3]$": true
>>
>> These look unusual. Is this a DSI controller? If so, then reference
>> dsi-controller. See other bindings how this is done.
> 
> This is a DSI controller, as referenced above. Those properties are from
> dsi-controller.yaml

Ahh, indeed, I missed that and focused on the additionalProperties.
Instead use unevaluatedProperties: false and drop all properties already
in dsi-controller.yaml.

> 
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - enum:
>>> +          - apple,j293-summit
>>> +          - apple,j493-summit
>>> +      - const: apple,summit
>>
>> Summit tells me nothing - no description, title repeats it, so I suggest
>> using device specific compatible.
> 
> The j293/j493 are the device-specific compatibles, those are chassis names
> for the specific laptops the panel is present in.

This does not address my comment. Use specific compatibles as fallback,
just like we recommend for every device. This should not be different.
If you do not know the hardware details, using generic is even less
appropriate.

> 
> 
>> No, these cannot be true without definition. Again, please open existing
>> bindings and use them as example. You probably miss here some reference,
>> but max-brightness for panel is a bit confusing. I asked already and did
>> not get answer: isn't this backlight property? What is this device -
>> backlight or panel? If panel, then what bus?
> 
> Per my response on previous version, it's both, kind of. This is a
> self-emissive panel on

I see, I think I again totally missed that you have there references to
backlight, so binding is in general fine. Describe the hardware in
description field (see commit for mentioned Samsung panel).


Best regards,
Krzysztof

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Hector Martin]

On 2024/11/27 2:20, Krzysztof Kozlowski wrote:
> On 26/11/2024 18:00, Sasha Finkelstein wrote:
>> On Tue, 26 Nov 2024 at 17:46, Krzysztof Kozlowski <krzk@kernel.org> wrote:
>>>> +properties:
>>>> +  compatible:
>>>> +    items:
>>>> +      - enum:
>>>> +          - apple,j293-summit
>>>> +          - apple,j493-summit
>>>> +      - const: apple,summit
>>>
>>> Summit tells me nothing - no description, title repeats it, so I suggest
>>> using device specific compatible.
>>
>> The j293/j493 are the device-specific compatibles, those are chassis names
>> for the specific laptops the panel is present in.
> 
> This does not address my comment. Use specific compatibles as fallback,
> just like we recommend for every device. This should not be different.
> If you do not know the hardware details, using generic is even less
> appropriate.

The panel is codenamed "summit", and that tells you everything. It's a
panel sold and marketed by Apple. It is used on two devices, which are
specifically referred to as the device names "j293" and "j493". There is
no further information to be added here, the names chosen already
contain 100% of the available information and are completely and fully
specific as to what devices are involved here. There is no more specific
or appropriate compatible possible. "summit" literally comes from
Apple's own device tree compatible in the macOS world, which is
"lcd,summit". If Apple uses it as a DT compatible, then it's a good bet
it is precisely what it needs to be to identify a device. The
chassis-specific versions are something we added on top of that and
likely aren't even necessary since it's almost certainly precisely the
same exact panel in both laptops, but as you know, it's best to be
specific with DT compatibles just in case.

There is plenty of prior art for compatibles that don't look like random
product code gobbledygook (which I think is what you were expecting?),
e.g. these panels:

ti,nspire-cx-lcd-panel
ste,mcde-dsi
raspberrypi,7inch-touchscreen-panel
olimex,lcd-olinuxino
focaltech,gpt3

So yeah, the correct compatible is in fact "apple,summit". Anything else
would be making things up for no reason. The vendor has chosen to call
this panel "summit", so "summit" it is. We're not in the business of
gratuitously assigning our own product names/codes when a suitable one
already exists here.

- Hector

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Sasha Finkelstein]

On Tue, 26 Nov 2024 at 17:46, Krzysztof Kozlowski <krzk@kernel.org> wrote:
> Please take a look how other bindings define ports. You miss here
> several items and more important - description what are these ports for.

Aside from missing descriptions, this definition is copied almost verbatim from
snps,dw-mipi-dsi.
Ack on the rest of the comments, those and the descriptions will be
fixed for v3.

Re: [PATCH v2 1/5] dt-bindings: display: Add Apple pre-DCP display controller bindings

[Nick Chan]

On 27/11/2024 00:34, Sasha Finkelstein via B4 Relay wrote:

[...]
> diff --git a/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml b/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..2cf2f50e9fc7329a5b424d5ddf8c34cad2ebb6be
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
[...]
> +
> +  reg:
> +    maxItems: 1
> +
> +  reg-names:
> +    const: mipi
> +
Drop. Not needed as there is only one reg now.

[...]

Nick Chan

[PATCH v2 2/5] drm: adp: Add Apple Display Pipe driver

[Sasha Finkelstein via B4 Relay]

From: Sasha Finkelstein <fnkl.kernel@gmail.com>

This display controller is present on M-series chips and is used
to drive the touchbar display.

Co-developed-by: Janne Grunau <j@jannau.net>
Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
 drivers/gpu/drm/Kconfig        |   2 +
 drivers/gpu/drm/Makefile       |   1 +
 drivers/gpu/drm/adp/Kconfig    |  16 ++
 drivers/gpu/drm/adp/Makefile   |   4 +
 drivers/gpu/drm/adp/adp-mipi.c | 251 +++++++++++++++++
 drivers/gpu/drm/adp/adp_drv.c  | 594 +++++++++++++++++++++++++++++++++++++++++
 6 files changed, 868 insertions(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 5504721007cc190e7d768d42aa9633baa0115f5e..acd1111f1773ef044c306c62ad9f850996259ef1 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -499,6 +499,8 @@ source "drivers/gpu/drm/mcde/Kconfig"
 
 source "drivers/gpu/drm/tidss/Kconfig"
 
+source "drivers/gpu/drm/adp/Kconfig"
+
 source "drivers/gpu/drm/xlnx/Kconfig"
 
 source "drivers/gpu/drm/gud/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 463afad1b5ca6275e61223adc8ca036c3d4d6b03..acd8d8943ef2bf85c80db7c218c59a7ec2df56da 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -213,6 +213,7 @@ obj-y			+= mxsfb/
 obj-y			+= tiny/
 obj-$(CONFIG_DRM_PL111) += pl111/
 obj-$(CONFIG_DRM_TVE200) += tve200/
+obj-$(CONFIG_DRM_ADP) += adp/
 obj-$(CONFIG_DRM_XEN) += xen/
 obj-$(CONFIG_DRM_VBOXVIDEO) += vboxvideo/
 obj-$(CONFIG_DRM_LIMA)  += lima/
diff --git a/drivers/gpu/drm/adp/Kconfig b/drivers/gpu/drm/adp/Kconfig
new file mode 100644
index 0000000000000000000000000000000000000000..7e70b2e26555a2c2ddf71350bce74c97dfe292da
--- /dev/null
+++ b/drivers/gpu/drm/adp/Kconfig
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-only OR MIT
+config DRM_ADP
+	tristate "DRM Support for pre-DCP Apple display controllers"
+	depends on DRM && OF && ARM64
+	depends on ARCH_APPLE || COMPILE_TEST
+	select DRM_KMS_HELPER
+	select DRM_BRIDGE_CONNECTOR
+	select DRM_DISPLAY_HELPER
+	select DRM_KMS_DMA_HELPER
+	select DRM_GEM_DMA_HELPER
+	select VIDEOMODE_HELPERS
+	select DRM_MIPI_DSI
+	help
+	  Chose this option if you have an Apple Arm laptop with a touchbar.
+
+	  If M is selected, this module will be called adpdrm.
diff --git a/drivers/gpu/drm/adp/Makefile b/drivers/gpu/drm/adp/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..7531fddfe6706ace716b288739e420379d98a8cc
--- /dev/null
+++ b/drivers/gpu/drm/adp/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only OR MIT
+
+adpdrm-y := adp_drv.o adp-mipi.o
+obj-$(CONFIG_DRM_ADP) += adpdrm.o
diff --git a/drivers/gpu/drm/adp/adp-mipi.c b/drivers/gpu/drm/adp/adp-mipi.c
new file mode 100644
index 0000000000000000000000000000000000000000..8ac17ddd0fc84acc63006202df1d8afa1189501f
--- /dev/null
+++ b/drivers/gpu/drm/adp/adp-mipi.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/iopoll.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+
+#define DSI_GEN_HDR 0x6c
+#define DSI_GEN_PLD_DATA 0x70
+
+#define DSI_CMD_PKT_STATUS 0x74
+
+#define GEN_PLD_R_EMPTY BIT(4)
+#define GEN_PLD_W_FULL BIT(3)
+#define GEN_PLD_W_EMPTY BIT(2)
+#define GEN_CMD_FULL BIT(1)
+#define GEN_CMD_EMPTY BIT(0)
+#define GEN_RD_CMD_BUSY BIT(6)
+#define CMD_PKT_STATUS_TIMEOUT_US 20000
+
+struct adp_mipi_drv_private {
+	struct mipi_dsi_host dsi;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+	void __iomem *mipi;
+};
+
+#define mipi_to_adp(x) container_of(x, struct adp_mipi_drv_private, dsi)
+
+static int adp_dsi_gen_pkt_hdr_write(struct adp_mipi_drv_private *adp, u32 hdr_val)
+{
+	int ret;
+	u32 val, mask;
+
+	ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+				 val, !(val & GEN_CMD_FULL), 1000,
+				 CMD_PKT_STATUS_TIMEOUT_US);
+	if (ret) {
+		dev_err(adp->dsi.dev, "failed to get available command FIFO\n");
+		return ret;
+	}
+
+	writel(hdr_val, adp->mipi + DSI_GEN_HDR);
+
+	mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
+	ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+				 val, (val & mask) == mask,
+				 1000, CMD_PKT_STATUS_TIMEOUT_US);
+	if (ret) {
+		dev_err(adp->dsi.dev, "failed to write command FIFO\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int adp_dsi_write(struct adp_mipi_drv_private *adp,
+			 const struct mipi_dsi_packet *packet)
+{
+	const u8 *tx_buf = packet->payload;
+	int len = packet->payload_length, pld_data_bytes = sizeof(u32), ret;
+	__le32 word;
+	u32 val;
+
+	while (len) {
+		if (len < pld_data_bytes) {
+			word = 0;
+			memcpy(&word, tx_buf, len);
+			writel(le32_to_cpu(word), adp->mipi + DSI_GEN_PLD_DATA);
+			len = 0;
+		} else {
+			memcpy(&word, tx_buf, pld_data_bytes);
+			writel(le32_to_cpu(word), adp->mipi + DSI_GEN_PLD_DATA);
+			tx_buf += pld_data_bytes;
+			len -= pld_data_bytes;
+		}
+
+		ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+					 val, !(val & GEN_PLD_W_FULL), 1000,
+					 CMD_PKT_STATUS_TIMEOUT_US);
+		if (ret) {
+			dev_err(adp->dsi.dev,
+				"failed to get available write payload FIFO\n");
+			return ret;
+		}
+	}
+
+	word = 0;
+	memcpy(&word, packet->header, sizeof(packet->header));
+	return adp_dsi_gen_pkt_hdr_write(adp, le32_to_cpu(word));
+}
+
+static int adp_dsi_read(struct adp_mipi_drv_private *adp,
+			const struct mipi_dsi_msg *msg)
+{
+	int i, j, ret, len = msg->rx_len;
+	u8 *buf = msg->rx_buf;
+	u32 val;
+
+	/* Wait end of the read operation */
+	ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+				 val, !(val & GEN_RD_CMD_BUSY),
+				 1000, CMD_PKT_STATUS_TIMEOUT_US);
+	if (ret) {
+		dev_err(adp->dsi.dev, "Timeout during read operation\n");
+		return ret;
+	}
+
+	for (i = 0; i < len; i += 4) {
+		/* Read fifo must not be empty before all bytes are read */
+		ret = readl_poll_timeout(adp->mipi + DSI_CMD_PKT_STATUS,
+					 val, !(val & GEN_PLD_R_EMPTY),
+					 1000, CMD_PKT_STATUS_TIMEOUT_US);
+		if (ret) {
+			dev_err(adp->dsi.dev, "Read payload FIFO is empty\n");
+			return ret;
+		}
+
+		val = readl(adp->mipi + DSI_GEN_PLD_DATA);
+		for (j = 0; j < 4 && j + i < len; j++)
+			buf[i + j] = val >> (8 * j);
+	}
+
+	return ret;
+}
+
+static ssize_t adp_dsi_host_transfer(struct mipi_dsi_host *host,
+				     const struct mipi_dsi_msg *msg)
+{
+	struct adp_mipi_drv_private *adp = mipi_to_adp(host);
+	struct mipi_dsi_packet packet;
+	int ret, nb_bytes;
+
+	ret = mipi_dsi_create_packet(&packet, msg);
+	if (ret) {
+		dev_err(adp->dsi.dev, "failed to create packet: %d\n", ret);
+		return ret;
+	}
+
+	ret = adp_dsi_write(adp, &packet);
+	if (ret)
+		return ret;
+
+	if (msg->rx_buf && msg->rx_len) {
+		ret = adp_dsi_read(adp, msg);
+		if (ret)
+			return ret;
+		nb_bytes = msg->rx_len;
+	} else {
+		nb_bytes = packet.size;
+	}
+
+	return nb_bytes;
+}
+
+static int adp_dsi_host_attach(struct mipi_dsi_host *host,
+			       struct mipi_dsi_device *dev)
+{
+	struct adp_mipi_drv_private *adp = mipi_to_adp(host);
+	struct drm_bridge *next;
+
+	next = devm_drm_of_get_bridge(adp->dsi.dev, adp->dsi.dev->of_node, 1, 0);
+	if (IS_ERR(next))
+		return PTR_ERR(next);
+
+	adp->next_bridge = next;
+
+	drm_bridge_add(&adp->bridge);
+	return 0;
+}
+
+static int adp_dsi_host_detach(struct mipi_dsi_host *host,
+			       struct mipi_dsi_device *dev)
+{
+	struct adp_mipi_drv_private *adp = mipi_to_adp(host);
+
+	drm_bridge_remove(&adp->bridge);
+	return 0;
+}
+
+static const struct mipi_dsi_host_ops adp_dsi_host_ops = {
+	.transfer = adp_dsi_host_transfer,
+	.attach = adp_dsi_host_attach,
+	.detach = adp_dsi_host_detach,
+};
+
+static int adp_dsi_bridge_attach(struct drm_bridge *bridge,
+				 enum drm_bridge_attach_flags flags)
+{
+	struct adp_mipi_drv_private *adp =
+		container_of(bridge, struct adp_mipi_drv_private, bridge);
+
+	return drm_bridge_attach(bridge->encoder, adp->next_bridge, bridge, flags);
+}
+
+static const struct drm_bridge_funcs adp_dsi_bridge_funcs = {
+	.attach	= adp_dsi_bridge_attach,
+};
+
+static int adp_mipi_probe(struct platform_device *pdev)
+{
+	struct adp_mipi_drv_private *adp;
+
+	adp = devm_kzalloc(&pdev->dev, sizeof(*adp), GFP_KERNEL);
+	if (!adp)
+		return -ENOMEM;
+
+	adp->mipi = devm_platform_ioremap_resource_byname(pdev, "mipi");
+	if (IS_ERR(adp->mipi)) {
+		dev_err(&pdev->dev, "failed to map mipi mmio");
+		return PTR_ERR(adp->mipi);
+	}
+
+	adp->dsi.dev = &pdev->dev;
+	adp->dsi.ops = &adp_dsi_host_ops;
+	adp->bridge.funcs = &adp_dsi_bridge_funcs;
+	adp->bridge.of_node = pdev->dev.of_node;
+	adp->bridge.type = DRM_MODE_CONNECTOR_DSI;
+	dev_set_drvdata(&pdev->dev, adp);
+	return mipi_dsi_host_register(&adp->dsi);
+}
+
+static void adp_mipi_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct adp_mipi_drv_private *adp = dev_get_drvdata(dev);
+
+	mipi_dsi_host_unregister(&adp->dsi);
+}
+
+static const struct of_device_id adp_mipi_of_match[] = {
+	{ .compatible = "apple,h7-display-pipe-mipi", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, adp_mipi_of_match);
+
+static struct platform_driver adp_mipi_platform_driver = {
+	.driver = {
+		.name = "adp-mipi",
+		.of_match_table = adp_mipi_of_match,
+	},
+	.probe = adp_mipi_probe,
+	.remove = adp_mipi_remove,
+};
+
+module_platform_driver(adp_mipi_platform_driver);
+
+MODULE_DESCRIPTION("Apple Display Pipe MIPI driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/adp/adp_drv.c b/drivers/gpu/drm/adp/adp_drv.c
new file mode 100644
index 0000000000000000000000000000000000000000..9384490e2895f7808a987b0aec147b52516a2f8c
--- /dev/null
+++ b/drivers/gpu/drm/adp/adp_drv.c
@@ -0,0 +1,594 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/iopoll.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_vblank.h>
+
+#define ADP_INT_STATUS 0x34
+#define ADP_INT_STATUS_INT_MASK 0x7
+#define ADP_INT_STATUS_VBLANK 0x1
+#define ADP_CTRL 0x100
+#define ADP_CTRL_VBLANK_ON 0x12
+#define ADP_CTRL_FIFO_ON 0x601
+#define ADP_SCREEN_SIZE 0x0c
+#define ADP_SCREEN_HSIZE GENMASK(15, 0)
+#define ADP_SCREEN_VSIZE GENMASK(31, 16)
+
+#define ADBE_FIFO 0x10c0
+#define ADBE_FIFO_SYNC 0xc0000000
+
+#define ADBE_BLEND_BYPASS 0x2020
+#define ADBE_BLEND_EN1 0x2028
+#define ADBE_BLEND_EN2 0x2074
+#define ADBE_BLEND_EN3 0x202c
+#define ADBE_BLEND_EN4 0x2034
+#define ADBE_MASK_BUF 0x2200
+
+#define ADBE_SRC_START 0x4040
+#define ADBE_SRC_SIZE 0x4048
+#define ADBE_DST_START 0x4050
+#define ADBE_DST_SIZE 0x4054
+#define ADBE_STRIDE 0x4038
+#define ADBE_FB_BASE 0x4030
+
+#define ADBE_LAYER_EN1 0x4020
+#define ADBE_LAYER_EN2 0x4068
+#define ADBE_LAYER_EN3 0x40b4
+#define ADBE_LAYER_EN4 0x40f4
+#define ADBE_SCALE_CTL 0x40ac
+#define ADBE_SCALE_CTL_BYPASS 0x100000
+
+#define ADBE_LAYER_CTL 0x1038
+#define ADBE_LAYER_CTL_ENABLE 0x10000
+
+#define ADBE_PIX_FMT 0x402c
+#define ADBE_PIX_FMT_XRGB32 0x53e4001
+
+static int adp_open(struct inode *inode, struct file *filp)
+{
+	/*
+	 * The modesetting driver does not check the non-desktop connector
+	 * property and keeps the device open and locked. If the touchbar daemon
+	 * opens the device first modesetting breaks the whole X session.
+	 * Simply refuse to open the device for X11 server processes as
+	 * workaround.
+	 */
+	if (current->comm[0] == 'X')
+		return -EBUSY;
+
+	return drm_open(inode, filp);
+}
+
+static const struct file_operations adp_fops = {
+	.owner          = THIS_MODULE,
+	.open           = adp_open,
+	.release        = drm_release,
+	.unlocked_ioctl = drm_ioctl,
+	.compat_ioctl   = drm_compat_ioctl,
+	.poll           = drm_poll,
+	.read           = drm_read,
+	.llseek         = noop_llseek,
+	.mmap           = drm_gem_mmap,
+	.fop_flags      = FOP_UNSIGNED_OFFSET,
+	DRM_GEM_DMA_UNMAPPED_AREA_FOPS
+};
+
+static int adp_drm_gem_dumb_create(struct drm_file *file_priv,
+					struct drm_device *drm,
+					struct drm_mode_create_dumb *args)
+{
+	args->height = ALIGN(args->height, 64);
+	args->size = args->pitch * args->height;
+
+	return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
+}
+
+static const struct drm_driver adp_driver = {
+	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.fops = &adp_fops,
+	DRM_GEM_DMA_DRIVER_OPS_VMAP_WITH_DUMB_CREATE(adp_drm_gem_dumb_create),
+	.name = "adp",
+	.desc = "Apple Display Pipe DRM Driver",
+	.date = "20230412",
+	.major = 0,
+	.minor = 1,
+};
+
+struct adp_drv_private {
+	struct drm_device drm;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+	struct drm_connector *connector;
+	struct drm_bridge *next_bridge;
+	void __iomem *be;
+	void __iomem *fe;
+	u32 *mask_buf;
+	u64 mask_buf_size;
+	dma_addr_t mask_iova;
+	int be_irq;
+	int fe_irq;
+	spinlock_t irq_lock;
+	struct drm_pending_vblank_event *event;
+};
+
+struct adp_plane {
+	struct drm_plane base_plane;
+	u8 id;
+};
+
+#define to_adp(x) container_of(x, struct adp_drv_private, drm)
+#define crtc_to_adp(x) container_of(x, struct adp_drv_private, crtc)
+
+static int adp_plane_atomic_check(struct drm_plane *plane,
+				    struct drm_atomic_state *state)
+{
+	struct drm_plane_state *new_plane_state;
+	struct drm_crtc_state *crtc_state;
+
+	new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+
+	if (!new_plane_state->crtc)
+		return 0;
+
+	crtc_state = drm_atomic_get_crtc_state(state, new_plane_state->crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+	return drm_atomic_helper_check_plane_state(new_plane_state,
+						   crtc_state,
+						   DRM_PLANE_NO_SCALING,
+						   DRM_PLANE_NO_SCALING,
+						   true, true);
+}
+
+static void adp_plane_atomic_update(struct drm_plane *plane,
+				    struct drm_atomic_state *state)
+{
+	struct adp_drv_private *adp;
+	struct drm_rect src_rect;
+	struct drm_gem_dma_object *obj;
+	struct drm_framebuffer *fb;
+	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, plane);
+	u32 src_pos, src_size, dst_pos, dst_size;
+
+	if (!plane || !new_state)
+		return;
+
+	fb = new_state->fb;
+	if (!fb)
+		return;
+	adp = to_adp(plane->dev);
+
+	drm_rect_fp_to_int(&src_rect, &new_state->src);
+	src_pos = src_rect.x1 << 16 | src_rect.y1;
+	dst_pos = new_state->dst.x1 << 16 | new_state->dst.y1;
+	src_size = drm_rect_width(&src_rect) << 16 | drm_rect_height(&src_rect);
+	dst_size = drm_rect_width(&new_state->dst) << 16 |
+		drm_rect_height(&new_state->dst);
+	writel(src_pos, adp->be + ADBE_SRC_START);
+	writel(src_size, adp->be + ADBE_SRC_SIZE);
+	writel(dst_pos, adp->be + ADBE_DST_START);
+	writel(dst_size, adp->be + ADBE_DST_SIZE);
+	writel(fb->pitches[0], adp->be + ADBE_STRIDE);
+	obj = drm_fb_dma_get_gem_obj(fb, 0);
+	if (obj)
+		writel(obj->dma_addr + fb->offsets[0], adp->be + ADBE_FB_BASE);
+
+	writel(BIT(0), adp->be + ADBE_LAYER_EN1);
+	writel(BIT(0), adp->be + ADBE_LAYER_EN2);
+	writel(BIT(0), adp->be + ADBE_LAYER_EN3);
+	writel(BIT(0), adp->be + ADBE_LAYER_EN4);
+	writel(ADBE_SCALE_CTL_BYPASS, adp->be + ADBE_SCALE_CTL);
+	writel(ADBE_LAYER_CTL_ENABLE | BIT(0), adp->be + ADBE_LAYER_CTL);
+	writel(ADBE_PIX_FMT_XRGB32, adp->be + ADBE_PIX_FMT);
+}
+
+static void adp_plane_atomic_disable(struct drm_plane *plane,
+				     struct drm_atomic_state *state)
+{
+	struct adp_drv_private *adp = to_adp(plane->dev);
+
+	writel(0x0, adp->be + ADBE_LAYER_EN1);
+	writel(0x0, adp->be + ADBE_LAYER_EN2);
+	writel(0x0, adp->be + ADBE_LAYER_EN3);
+	writel(0x0, adp->be + ADBE_LAYER_EN4);
+	writel(ADBE_LAYER_CTL_ENABLE, adp->be + ADBE_LAYER_CTL);
+}
+
+static const struct drm_plane_helper_funcs adp_plane_helper_funcs = {
+	.atomic_check = adp_plane_atomic_check,
+	.atomic_update = adp_plane_atomic_update,
+	.atomic_disable = adp_plane_atomic_disable,
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS
+};
+
+static const struct drm_plane_funcs adp_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	DRM_GEM_SHADOW_PLANE_FUNCS
+};
+
+static const u32 plane_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+#define ALL_CRTCS 1
+
+static struct adp_plane *adp_plane_new(struct adp_drv_private *adp, u8 id)
+{
+	struct drm_device *drm = &adp->drm;
+	struct adp_plane *plane;
+	enum drm_plane_type plane_type;
+
+	plane_type = (id == 0) ? DRM_PLANE_TYPE_PRIMARY :
+		DRM_PLANE_TYPE_OVERLAY;
+
+	plane = drmm_universal_plane_alloc(drm, struct adp_plane, base_plane,
+					   ALL_CRTCS, &adp_plane_funcs,
+					   plane_formats, ARRAY_SIZE(plane_formats),
+					   NULL, plane_type, "plane %d", id);
+	if (!plane) {
+		drm_err(drm, "failed to allocate plane");
+		return ERR_PTR(-ENOMEM);
+	}
+	plane->id = id;
+
+	drm_plane_helper_add(&plane->base_plane, &adp_plane_helper_funcs);
+	return plane;
+}
+
+static void adp_enable_vblank(struct adp_drv_private *adp)
+{
+	u32 cur_ctrl;
+
+	writel(ADP_INT_STATUS_INT_MASK, adp->fe + ADP_INT_STATUS);
+
+	cur_ctrl = readl(adp->fe + ADP_CTRL);
+	writel(cur_ctrl | ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+}
+
+static int adp_crtc_enable_vblank(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct adp_drv_private *adp = to_adp(dev);
+
+	adp_enable_vblank(adp);
+
+	return 0;
+}
+
+static void adp_disable_vblank(struct adp_drv_private *adp)
+{
+	u32 cur_ctrl;
+
+	cur_ctrl = readl(adp->fe + ADP_CTRL);
+	writel(cur_ctrl & ~ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+	writel(ADP_INT_STATUS_INT_MASK, adp->fe + ADP_INT_STATUS);
+}
+
+static void adp_crtc_disable_vblank(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct adp_drv_private *adp = to_adp(dev);
+
+	adp_disable_vblank(adp);
+}
+
+static void adp_crtc_atomic_enable(struct drm_crtc *crtc,
+				   struct drm_atomic_state *state)
+{
+	struct adp_drv_private *adp = crtc_to_adp(crtc);
+
+	writel(BIT(0), adp->be + ADBE_BLEND_EN2);
+	writel(BIT(4), adp->be + ADBE_BLEND_EN1);
+	writel(BIT(0), adp->be + ADBE_BLEND_EN3);
+	writel(BIT(0), adp->be + ADBE_BLEND_BYPASS);
+	writel(BIT(0), adp->be + ADBE_BLEND_EN4);
+}
+
+static void adp_crtc_atomic_disable(struct drm_crtc *crtc,
+				    struct drm_atomic_state *state)
+{
+	struct adp_drv_private *adp = crtc_to_adp(crtc);
+	struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state, crtc);
+
+	drm_atomic_helper_disable_planes_on_crtc(old_state, false);
+
+	writel(0x0, adp->be + ADBE_BLEND_EN2);
+	writel(0x0, adp->be + ADBE_BLEND_EN1);
+	writel(0x0, adp->be + ADBE_BLEND_EN3);
+	writel(0x0, adp->be + ADBE_BLEND_BYPASS);
+	writel(0x0, adp->be + ADBE_BLEND_EN4);
+	drm_crtc_vblank_off(crtc);
+}
+
+static void adp_crtc_atomic_flush(struct drm_crtc *crtc,
+				  struct drm_atomic_state *state)
+{
+	u32 frame_num = 1;
+	struct adp_drv_private *adp = crtc_to_adp(crtc);
+	struct drm_crtc_state *new_state = drm_atomic_get_new_crtc_state(state, crtc);
+	u64 new_size = ALIGN(new_state->mode.hdisplay *
+			     new_state->mode.vdisplay * 4, PAGE_SIZE);
+
+	if (new_size != adp->mask_buf_size) {
+		if (adp->mask_buf)
+			dma_free_coherent(crtc->dev->dev, adp->mask_buf_size,
+					  adp->mask_buf, adp->mask_iova);
+		adp->mask_buf = NULL;
+		if (new_size != 0) {
+			adp->mask_buf = dma_alloc_coherent(crtc->dev->dev, new_size,
+							   &adp->mask_iova, GFP_KERNEL);
+			memset(adp->mask_buf, 0xFF, new_size);
+			writel(adp->mask_iova, adp->be + ADBE_MASK_BUF);
+		}
+		adp->mask_buf_size = new_size;
+	}
+	writel(ADBE_FIFO_SYNC | frame_num, adp->be + ADBE_FIFO);
+	//FIXME: use adbe flush interrupt
+	spin_lock_irq(&crtc->dev->event_lock);
+	if (crtc->state->event) {
+		drm_crtc_vblank_get(crtc);
+		adp->event = crtc->state->event;
+	}
+	crtc->state->event = NULL;
+	spin_unlock_irq(&crtc->dev->event_lock);
+}
+
+static const struct drm_crtc_funcs adp_crtc_funcs = {
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.reset = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	.enable_vblank = adp_crtc_enable_vblank,
+	.disable_vblank = adp_crtc_disable_vblank,
+};
+
+
+static const struct drm_crtc_helper_funcs adp_crtc_helper_funcs = {
+	.atomic_enable = adp_crtc_atomic_enable,
+	.atomic_disable = adp_crtc_atomic_disable,
+	.atomic_flush = adp_crtc_atomic_flush,
+};
+
+static int adp_setup_crtc(struct adp_drv_private *adp)
+{
+	struct drm_device *drm = &adp->drm;
+	struct adp_plane *primary;
+	int ret;
+
+	primary = adp_plane_new(adp, 0);
+	if (IS_ERR(primary))
+		return PTR_ERR(primary);
+
+	ret = drm_crtc_init_with_planes(drm, &adp->crtc, &primary->base_plane,
+					NULL, &adp_crtc_funcs, NULL);
+	if (ret)
+		return ret;
+
+	drm_crtc_helper_add(&adp->crtc, &adp_crtc_helper_funcs);
+	return 0;
+}
+
+static const struct drm_mode_config_funcs adp_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int adp_setup_mode_config(struct adp_drv_private *adp)
+{
+	struct drm_device *drm = &adp->drm;
+	int ret;
+	u32 size;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
+	/*
+	 * Query screen size restrict the frame buffer size to the screen size
+	 * aligned to the next multiple of 64. This is not necessary but can be
+	 * used as simple check for non-desktop devices.
+	 * Xorg's modesetting driver does not care about the connector
+	 * "non-desktop" property. The max frame buffer width or height can be
+	 * easily checked and a device can be reject if the max width/height is
+	 * smaller than 120 for example.
+	 * Any touchbar daemon is not limited by this small framebuffer size.
+	 */
+	size = readl(adp->fe + ADP_SCREEN_SIZE);
+
+	drm->mode_config.min_width = 32;
+	drm->mode_config.min_height = 32;
+	drm->mode_config.max_width = ALIGN(FIELD_GET(ADP_SCREEN_HSIZE, size), 64);
+	drm->mode_config.max_height = ALIGN(FIELD_GET(ADP_SCREEN_VSIZE, size), 64);
+	drm->mode_config.preferred_depth = 24;
+	drm->mode_config.prefer_shadow = 0;
+	drm->mode_config.funcs = &adp_mode_config_funcs;
+
+	ret = adp_setup_crtc(adp);
+	if (ret) {
+		drm_err(drm, "failed to create crtc");
+		return ret;
+	}
+
+	adp->encoder.possible_crtcs = ALL_CRTCS;
+	ret = drm_simple_encoder_init(drm, &adp->encoder, DRM_MODE_ENCODER_DSI);
+	if (ret) {
+		drm_err(drm, "failed to init encoder");
+		return ret;
+	}
+
+	ret = drm_bridge_attach(&adp->encoder, adp->next_bridge, NULL,
+				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+	if (ret) {
+		drm_err(drm, "failed to init bridge chain");
+		return ret;
+	}
+
+	adp->connector = drm_bridge_connector_init(drm, &adp->encoder);
+	if (IS_ERR(adp->connector))
+		return PTR_ERR(adp->connector);
+
+	drm_connector_attach_encoder(adp->connector, &adp->encoder);
+
+	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	if (ret < 0) {
+		drm_err(drm, "failed to initialize vblank");
+		return ret;
+	}
+
+	drm_mode_config_reset(drm);
+
+	return 0;
+}
+
+static int adp_parse_of(struct platform_device *pdev, struct adp_drv_private *adp)
+{
+	struct device *dev = &pdev->dev;
+
+	adp->be = devm_platform_ioremap_resource_byname(pdev, "be");
+	if (IS_ERR(adp->be)) {
+		dev_err(dev, "failed to map display backend mmio");
+		return PTR_ERR(adp->be);
+	}
+
+	adp->fe = devm_platform_ioremap_resource_byname(pdev, "fe");
+	if (IS_ERR(adp->fe)) {
+		dev_err(dev, "failed to map display pipe mmio");
+		return PTR_ERR(adp->fe);
+	}
+
+	adp->be_irq = platform_get_irq_byname(pdev, "be");
+	if (adp->be_irq < 0) {
+		dev_err(dev, "failed to find be irq");
+		return adp->be_irq;
+	}
+
+	adp->fe_irq = platform_get_irq_byname(pdev, "fe");
+	if (adp->fe_irq < 0) {
+		dev_err(dev, "failed to find fe irq");
+		return adp->fe_irq;
+	}
+
+	adp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);
+	if (IS_ERR(adp->next_bridge)) {
+		if (PTR_ERR(adp->next_bridge) != EPROBE_DEFER)
+			dev_err(dev, "failed to find next bridge");
+		return PTR_ERR(adp->next_bridge);
+	}
+
+	return 0;
+}
+
+static irqreturn_t adp_fe_irq(int irq, void *arg)
+{
+	struct adp_drv_private *adp = (struct adp_drv_private *)arg;
+	u32 int_status;
+	u32 int_ctl;
+
+	spin_lock(&adp->irq_lock);
+
+	int_status = readl(adp->fe + ADP_INT_STATUS);
+	if (int_status & ADP_INT_STATUS_VBLANK) {
+		drm_crtc_handle_vblank(&adp->crtc);
+		spin_lock(&adp->crtc.dev->event_lock);
+		if (adp->event) {
+			int_ctl = readl(adp->fe + ADP_CTRL);
+			if ((int_ctl & 0xF00) == 0x600) {
+				drm_crtc_send_vblank_event(&adp->crtc, adp->event);
+				adp->event = NULL;
+				drm_crtc_vblank_put(&adp->crtc);
+			}
+		}
+		spin_unlock(&adp->crtc.dev->event_lock);
+	}
+
+	writel(int_status, adp->fe + ADP_INT_STATUS);
+
+	spin_unlock(&adp->irq_lock);
+
+	return IRQ_HANDLED;
+}
+
+static int adp_probe(struct platform_device *pdev)
+{
+	struct adp_drv_private *adp;
+	int err;
+
+	adp = devm_drm_dev_alloc(&pdev->dev, &adp_driver, struct adp_drv_private, drm);
+	if (IS_ERR(adp))
+		return PTR_ERR(adp);
+
+	spin_lock_init(&adp->irq_lock);
+
+	dev_set_drvdata(&pdev->dev, &adp->drm);
+
+	err = adp_parse_of(pdev, adp);
+	if (err < 0)
+		return err;
+
+	adp_disable_vblank(adp);
+	writel(ADP_CTRL_FIFO_ON | ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+
+	err = adp_setup_mode_config(adp);
+	if (err < 0)
+		return err;
+
+	err = devm_request_irq(&pdev->dev, adp->fe_irq, adp_fe_irq, 0,
+			       "adp-fe", adp);
+	if (err)
+		return err;
+
+	err = drm_dev_register(&adp->drm, 0);
+	if (err)
+		return err;
+	return 0;
+}
+
+static void adp_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct drm_device *drm = dev_get_drvdata(dev);
+	struct adp_drv_private *adp = to_adp(drm);
+
+	adp_disable_vblank(adp);
+	drm_dev_unregister(drm);
+	dev_set_drvdata(dev, NULL);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static const struct of_device_id adp_of_match[] = {
+	{ .compatible = "apple,h7-display-pipe", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, adp_of_match);
+
+static struct platform_driver adp_platform_driver = {
+	.driver = {
+		.name = "adp",
+		.of_match_table = adp_of_match,
+	},
+	.probe = adp_probe,
+	.remove = adp_remove,
+};
+
+module_platform_driver(adp_platform_driver);
+
+MODULE_DESCRIPTION("Apple Display Pipe DRM driver");
+MODULE_LICENSE("GPL");

-- 
2.47.1

Re: [PATCH v2 2/5] drm: adp: Add Apple Display Pipe driver

[Alyssa Ross]

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On Tue, Nov 26, 2024 at 05:34:21PM +0100, Sasha Finkelstein via B4 Relay wrote:
> +module_platform_driver(adp_mipi_platform_driver);

This is part of the same driver as adp_drv.c, so I don't think there's
supposed to be another module_platform_driver() call here?

/nix/store/hni09p7jhc8szjr2h5j5m0lhi2x0djjg-binutils-2.43.1/bin/ld: drivers/gpu/drm/adp/adp-mipi.o: in function `adp_mipi_platform_driver_init':
adp-mipi.c:(.init.text+0x0): multiple definition of `init_module'; drivers/gpu/drm/adp/adp_drv.o:adp_drv.c:(.init.text+0x0): first defined here
/nix/store/hni09p7jhc8szjr2h5j5m0lhi2x0djjg-binutils-2.43.1/bin/ld: drivers/gpu/drm/adp/adp-mipi.o: in function `adp_mipi_platform_driver_exit':
adp-mipi.c:(.exit.text+0x0): multiple definition of `cleanup_module'; drivers/gpu/drm/adp/adp_drv.o:adp_drv.c:(.exit.text+0x0): first defined here

BTW: would have been nice to have been CCed, given I provided feedback
on the previous version of this patch.

[-- Attachment #2: signature.asc --]
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[PATCH v2 3/5] drm: panel: Add a panel driver for the Summit display

[Sasha Finkelstein via B4 Relay]

From: Sasha Finkelstein <fnkl.kernel@gmail.com>

This is the display panel used for the touchbar on laptops that have it.

Co-developed-by: Nick Chan <towinchenmi@gmail.com>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig        |   9 +++
 drivers/gpu/drm/panel/Makefile       |   1 +
 drivers/gpu/drm/panel/panel-summit.c | 143 +++++++++++++++++++++++++++++++++++
 3 files changed, 153 insertions(+)

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index d7469c565d1db8b8e974dd6c45d03d9352d99d63..5085a82e4bc695e85cabbc3200859bbe10cb0f91 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -925,6 +925,15 @@ config DRM_PANEL_SIMPLE
 	  that it can be automatically turned off when the panel goes into a
 	  low power state.
 
+config DRM_PANEL_SUMMIT
+	tristate "Apple Summit display panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y if you want to enable support for the "Summit" display panel
+	  used as a touchbar on certain Apple laptops.
+
 config DRM_PANEL_SYNAPTICS_R63353
 	tristate "Synaptics R63353-based panels"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 7dcf72646cacff11bab90c78e3b8b1f357e5f14a..10ac2e850f5cd6d6546439de75483466e4015d1a 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_DRM_PANEL_SHARP_LS060T1SX01) += panel-sharp-ls060t1sx01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_SUMMIT) += panel-summit.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) += panel-synaptics-r63353.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
 obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) += panel-sony-td4353-jdi.o
diff --git a/drivers/gpu/drm/panel/panel-summit.c b/drivers/gpu/drm/panel/panel-summit.c
new file mode 100644
index 0000000000000000000000000000000000000000..16bd9fa1213d7bc3f022b878ea5cfeadbd468995
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-summit.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/backlight.h>
+#include <drm/drm_device.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_mode.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <video/mipi_display.h>
+
+struct summit_data {
+	struct mipi_dsi_device *dsi;
+	struct backlight_device *bl;
+	struct drm_panel panel;
+};
+
+static int summit_set_brightness(struct device *dev)
+{
+	struct summit_data *s_data = dev_get_drvdata(dev);
+	int level = backlight_get_brightness(s_data->bl);
+
+	return mipi_dsi_dcs_set_display_brightness(s_data->dsi, level);
+}
+
+static int summit_bl_update_status(struct backlight_device *dev)
+{
+	return summit_set_brightness(&dev->dev);
+}
+
+static int summit_bl_get_brightness(struct backlight_device *dev)
+{
+	return backlight_get_brightness(dev);
+}
+
+static const struct backlight_ops summit_bl_ops = {
+	.get_brightness = summit_bl_get_brightness,
+	.update_status	= summit_bl_update_status,
+};
+
+static int summit_get_modes(struct drm_panel *panel,
+			    struct drm_connector *connector)
+{
+	struct drm_display_mode *mode = drm_mode_create(connector->dev);
+
+	connector->display_info.non_desktop = true;
+	drm_object_property_set_value(&connector->base,
+				      connector->dev->mode_config.non_desktop_property,
+				      connector->display_info.non_desktop);
+
+	mode->vdisplay = 2008;
+	mode->hdisplay = 60;
+	mode->hsync_start = mode->hdisplay + 8;
+	mode->hsync_end = mode->hsync_start + 80;
+	mode->htotal = mode->hsync_end + 40;
+	mode->vsync_start = mode->vdisplay + 1;
+	mode->vsync_end = mode->vsync_start + 15;
+	mode->vtotal = mode->vsync_end + 6;
+	mode->clock = (mode->vtotal * mode->htotal * 60) / 1000;
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
+	drm_mode_set_name(mode);
+	drm_mode_probed_add(connector, mode);
+	return 1;
+}
+
+static const struct drm_panel_funcs summit_panel_funcs = {
+	.get_modes = summit_get_modes,
+};
+
+static int summit_probe(struct mipi_dsi_device *dsi)
+{
+	struct backlight_properties props = { 0 };
+	struct device *dev = &dsi->dev;
+	struct summit_data *s_data;
+	int ret;
+
+	s_data = devm_kzalloc(dev, sizeof(*s_data), GFP_KERNEL);
+	if (!s_data)
+		return -ENOMEM;
+
+	mipi_dsi_set_drvdata(dsi, s_data);
+	s_data->dsi = dsi;
+
+	ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness);
+	if (ret)
+		return ret;
+	props.type = BACKLIGHT_RAW;
+
+	s_data->bl = devm_backlight_device_register(dev, dev_name(dev),
+						   dev, s_data, &summit_bl_ops, &props);
+	if (IS_ERR(s_data->bl))
+		return PTR_ERR(s_data->bl);
+
+	drm_panel_init(&s_data->panel, dev, &summit_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	drm_panel_add(&s_data->panel);
+
+	return mipi_dsi_attach(dsi);
+}
+
+static void summit_remove(struct mipi_dsi_device *dsi)
+{
+	struct summit_data *s_data = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_panel_remove(&s_data->panel);
+}
+
+static int summit_resume(struct device *dev)
+{
+	return summit_set_brightness(dev);
+}
+
+static int summit_suspend(struct device *dev)
+{
+	struct summit_data *s_data = dev_get_drvdata(dev);
+
+	return mipi_dsi_dcs_set_display_brightness(s_data->dsi, 0);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(summit_pm_ops, summit_suspend,
+				summit_resume);
+
+static const struct of_device_id summit_of_match[] = {
+	{ .compatible = "apple,summit" },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, summit_of_match);
+
+static struct mipi_dsi_driver summit_driver = {
+	.probe = summit_probe,
+	.remove = summit_remove,
+	.driver = {
+		.name = "panel-summit",
+		.of_match_table = summit_of_match,
+		.pm = pm_sleep_ptr(&summit_pm_ops),
+	},
+};
+module_mipi_dsi_driver(summit_driver);
+
+MODULE_DESCRIPTION("Summit Display Panel Driver");
+MODULE_LICENSE("GPL");

-- 
2.47.1

Re: [PATCH v2 3/5] drm: panel: Add a panel driver for the Summit display

[Dmitry Baryshkov]

On Tue, Nov 26, 2024 at 05:34:22PM +0100, Sasha Finkelstein via B4 Relay wrote:
> From: Sasha Finkelstein <fnkl.kernel@gmail.com>
> 
> This is the display panel used for the touchbar on laptops that have it.
> 
> Co-developed-by: Nick Chan <towinchenmi@gmail.com>
> Signed-off-by: Nick Chan <towinchenmi@gmail.com>
> Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
> ---
>  drivers/gpu/drm/panel/Kconfig        |   9 +++
>  drivers/gpu/drm/panel/Makefile       |   1 +
>  drivers/gpu/drm/panel/panel-summit.c | 143 +++++++++++++++++++++++++++++++++++
>  3 files changed, 153 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index d7469c565d1db8b8e974dd6c45d03d9352d99d63..5085a82e4bc695e85cabbc3200859bbe10cb0f91 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -925,6 +925,15 @@ config DRM_PANEL_SIMPLE
>  	  that it can be automatically turned off when the panel goes into a
>  	  low power state.
>  
> +config DRM_PANEL_SUMMIT
> +	tristate "Apple Summit display panel"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	help
> +	  Say Y if you want to enable support for the "Summit" display panel
> +	  used as a touchbar on certain Apple laptops.
> +
>  config DRM_PANEL_SYNAPTICS_R63353
>  	tristate "Synaptics R63353-based panels"
>  	depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 7dcf72646cacff11bab90c78e3b8b1f357e5f14a..10ac2e850f5cd6d6546439de75483466e4015d1a 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -89,6 +89,7 @@ obj-$(CONFIG_DRM_PANEL_SHARP_LS060T1SX01) += panel-sharp-ls060t1sx01.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
> +obj-$(CONFIG_DRM_PANEL_SUMMIT) += panel-summit.o
>  obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) += panel-synaptics-r63353.o
>  obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
>  obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) += panel-sony-td4353-jdi.o
> diff --git a/drivers/gpu/drm/panel/panel-summit.c b/drivers/gpu/drm/panel/panel-summit.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..16bd9fa1213d7bc3f022b878ea5cfeadbd468995
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-summit.c
> @@ -0,0 +1,143 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <linux/backlight.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_mode.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +#include <video/mipi_display.h>
> +
> +struct summit_data {
> +	struct mipi_dsi_device *dsi;
> +	struct backlight_device *bl;
> +	struct drm_panel panel;
> +};
> +
> +static int summit_set_brightness(struct device *dev)
> +{
> +	struct summit_data *s_data = dev_get_drvdata(dev);
> +	int level = backlight_get_brightness(s_data->bl);
> +
> +	return mipi_dsi_dcs_set_display_brightness(s_data->dsi, level);
> +}

Inline this function.

> +
> +static int summit_bl_update_status(struct backlight_device *dev)
> +{
> +	return summit_set_brightness(&dev->dev);
> +}
> +
> +static int summit_bl_get_brightness(struct backlight_device *dev)
> +{
> +	return backlight_get_brightness(dev);
> +}

Should not be necessary, please drop. Moreover
backlight_get_brightness() uses blanking information to override
brightness. As such it is not suitable for the .get_brightness()
callback.

> +
> +static const struct backlight_ops summit_bl_ops = {
> +	.get_brightness = summit_bl_get_brightness,
> +	.update_status	= summit_bl_update_status,
> +};
> +
> +static int summit_get_modes(struct drm_panel *panel,
> +			    struct drm_connector *connector)
> +{
> +	struct drm_display_mode *mode = drm_mode_create(connector->dev);
> +
> +	connector->display_info.non_desktop = true;
> +	drm_object_property_set_value(&connector->base,
> +				      connector->dev->mode_config.non_desktop_property,
> +				      connector->display_info.non_desktop);
> +
> +	mode->vdisplay = 2008;
> +	mode->hdisplay = 60;
> +	mode->hsync_start = mode->hdisplay + 8;
> +	mode->hsync_end = mode->hsync_start + 80;
> +	mode->htotal = mode->hsync_end + 40;
> +	mode->vsync_start = mode->vdisplay + 1;
> +	mode->vsync_end = mode->vsync_start + 15;
> +	mode->vtotal = mode->vsync_end + 6;
> +	mode->clock = (mode->vtotal * mode->htotal * 60) / 1000;
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
> +	drm_mode_set_name(mode);
> +	drm_mode_probed_add(connector, mode);
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs summit_panel_funcs = {
> +	.get_modes = summit_get_modes,
> +};
> +
> +static int summit_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct backlight_properties props = { 0 };
> +	struct device *dev = &dsi->dev;
> +	struct summit_data *s_data;
> +	int ret;
> +
> +	s_data = devm_kzalloc(dev, sizeof(*s_data), GFP_KERNEL);
> +	if (!s_data)
> +		return -ENOMEM;
> +
> +	mipi_dsi_set_drvdata(dsi, s_data);
> +	s_data->dsi = dsi;
> +
> +	ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness);
> +	if (ret)
> +		return ret;
> +	props.type = BACKLIGHT_RAW;
> +
> +	s_data->bl = devm_backlight_device_register(dev, dev_name(dev),
> +						   dev, s_data, &summit_bl_ops, &props);
> +	if (IS_ERR(s_data->bl))
> +		return PTR_ERR(s_data->bl);
> +
> +	drm_panel_init(&s_data->panel, dev, &summit_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +	drm_panel_add(&s_data->panel);
> +
> +	return mipi_dsi_attach(dsi);
> +}
> +
> +static void summit_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct summit_data *s_data = mipi_dsi_get_drvdata(dsi);
> +
> +	mipi_dsi_detach(dsi);
> +	drm_panel_remove(&s_data->panel);
> +}
> +
> +static int summit_resume(struct device *dev)
> +{
> +	return summit_set_brightness(dev);

Doesn't the generic code already handle that for you?

> +}
> +
> +static int summit_suspend(struct device *dev)
> +{
> +	struct summit_data *s_data = dev_get_drvdata(dev);
> +
> +	return mipi_dsi_dcs_set_display_brightness(s_data->dsi, 0);

And here too.

> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(summit_pm_ops, summit_suspend,
> +				summit_resume);
> +
> +static const struct of_device_id summit_of_match[] = {
> +	{ .compatible = "apple,summit" },
> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(of, summit_of_match);
> +
> +static struct mipi_dsi_driver summit_driver = {
> +	.probe = summit_probe,
> +	.remove = summit_remove,
> +	.driver = {
> +		.name = "panel-summit",
> +		.of_match_table = summit_of_match,
> +		.pm = pm_sleep_ptr(&summit_pm_ops),
> +	},
> +};
> +module_mipi_dsi_driver(summit_driver);
> +
> +MODULE_DESCRIPTION("Summit Display Panel Driver");
> +MODULE_LICENSE("GPL");
> 
> -- 
> 2.47.1
> 
> 

-- 
With best wishes
Dmitry

Re: [PATCH v2 3/5] drm: panel: Add a panel driver for the Summit display

[Sasha Finkelstein]

On Sat, 30 Nov 2024 at 10:29, Dmitry Baryshkov
<dmitry.baryshkov@linaro.org> wrote:
> > +
> > +static int summit_resume(struct device *dev)
> > +{
> > +     return summit_set_brightness(dev);
>
> Doesn't the generic code already handle that for you?

Apparently not, I have commented out the pm ops, entered sleep
and the display stayed on.

Re: [PATCH v2 3/5] drm: panel: Add a panel driver for the Summit display

[Dmitry Baryshkov]

On Sat, Nov 30, 2024 at 12:15:25PM +0100, Sasha Finkelstein wrote:
> On Sat, 30 Nov 2024 at 10:29, Dmitry Baryshkov
> <dmitry.baryshkov@linaro.org> wrote:
> > > +
> > > +static int summit_resume(struct device *dev)
> > > +{
> > > +     return summit_set_brightness(dev);
> >
> > Doesn't the generic code already handle that for you?
> 
> Apparently not, I have commented out the pm ops, entered sleep
> and the display stayed on.

Please add BL_CORE_SUSPENDRESUME option to the backlight device.
But interestingly enough, none of the panels set that flag.

-- 
With best wishes
Dmitry

Re: [PATCH v2 3/5] drm: panel: Add a panel driver for the Summit display

[Sasha Finkelstein]

On Sat, 30 Nov 2024 at 12:36, Dmitry Baryshkov
<dmitry.baryshkov@linaro.org> wrote:
> Please add BL_CORE_SUSPENDRESUME option to the backlight device.
> But interestingly enough, none of the panels set that flag.

It appears that setting that option re-orders something in the resume process
in such a way that the entire display locks up and becomes unusable until
the machine is rebooted. I will be sending v3 without this change.

[PATCH v2 4/5] arm64: dts: apple: Add touchbar screen nodes

[Sasha Finkelstein via B4 Relay]

From: Sasha Finkelstein <fnkl.kernel@gmail.com>

Adds device tree entries for the touchbar screen

Co-developed-by: Janne Grunau <j@jannau.net>
Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
 arch/arm64/boot/dts/apple/t8103-j293.dts | 31 ++++++++++++++++
 arch/arm64/boot/dts/apple/t8103.dtsi     | 61 +++++++++++++++++++++++++++++++
 arch/arm64/boot/dts/apple/t8112-j493.dts | 31 ++++++++++++++++
 arch/arm64/boot/dts/apple/t8112.dtsi     | 62 ++++++++++++++++++++++++++++++++
 4 files changed, 185 insertions(+)

diff --git a/arch/arm64/boot/dts/apple/t8103-j293.dts b/arch/arm64/boot/dts/apple/t8103-j293.dts
index 56b0c67bfcda321b60c621de092643017693ff91..3af8536da779b56bf856cf40befd74d4737baa8f 100644
--- a/arch/arm64/boot/dts/apple/t8103-j293.dts
+++ b/arch/arm64/boot/dts/apple/t8103-j293.dts
@@ -49,3 +49,34 @@ &i2c4 {
 &fpwm1 {
 	status = "okay";
 };
+
+&display_dfr {
+	status = "okay";
+};
+
+&dfr_mipi_out {
+	dfr_mipi_out_panel: endpoint@0 {
+		reg = <0>;
+		remote-endpoint = <&dfr_panel_in>;
+	};
+};
+
+&displaydfr_mipi {
+	status = "okay";
+
+	dfr_panel: panel@0 {
+		compatible = "apple,j293-summit", "apple,summit";
+		reg = <0>;
+		max-brightness = <255>;
+
+		port {
+			dfr_panel_in: endpoint {
+				remote-endpoint = <&dfr_mipi_out_panel>;
+			};
+		};
+	};
+};
+
+&displaydfr_dart {
+	status = "okay";
+};
diff --git a/arch/arm64/boot/dts/apple/t8103.dtsi b/arch/arm64/boot/dts/apple/t8103.dtsi
index 9b0dad6b618444ac6b1c9735c50cccfc3965f947..9c27911b3867d1279c133c936b7413c9eafcad8a 100644
--- a/arch/arm64/boot/dts/apple/t8103.dtsi
+++ b/arch/arm64/boot/dts/apple/t8103.dtsi
@@ -356,6 +356,67 @@ cpufreq_p: performance-controller@211e20000 {
 			#performance-domain-cells = <0>;
 		};
 
+		display_dfr: display-pipe@228200000 {
+			compatible = "apple,t8103-display-pipe", "apple,h7-display-pipe";
+			reg-names = "be", "fe";
+			reg = <0x2 0x28200000 0x0 0xc000>,
+				<0x2 0x28400000 0x0 0x4000>;
+			power-domains = <&ps_dispdfr_fe>, <&ps_dispdfr_be>;
+			interrupt-parent = <&aic>;
+			interrupts = <AIC_IRQ 502 IRQ_TYPE_LEVEL_HIGH>,
+				<AIC_IRQ 506 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "be", "fe";
+			iommus = <&displaydfr_dart 0>;
+			status = "disabled";
+
+			port {
+				dfr_adp_out_mipi: endpoint {
+					remote-endpoint = <&dfr_mipi_in_adp>;
+				};
+			};
+		};
+
+		displaydfr_dart: iommu@228304000 {
+			compatible = "apple,t8103-dart";
+			reg = <0x2 0x28304000 0x0 0x4000>;
+			interrupt-parent = <&aic>;
+			interrupts = <AIC_IRQ 504 IRQ_TYPE_LEVEL_HIGH>;
+			#iommu-cells = <1>;
+			power-domains = <&ps_dispdfr_fe>;
+			status = "disabled";
+		};
+
+		displaydfr_mipi: dsi@228600000 {
+			compatible = "apple,t8103-display-pipe-mipi", "apple,h7-display-pipe-mipi";
+			reg-names = "mipi";
+			reg = <0x2 0x28600000 0x0 0x100000>;
+			power-domains = <&ps_mipi_dsi>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				dfr_mipi_in: port@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+
+					dfr_mipi_in_adp: endpoint@0 {
+						reg = <0>;
+						remote-endpoint = <&dfr_adp_out_mipi>;
+					};
+				};
+
+				dfr_mipi_out: port@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+				};
+			};
+		};
+
 		sio_dart: iommu@235004000 {
 			compatible = "apple,t8103-dart";
 			reg = <0x2 0x35004000 0x0 0x4000>;
diff --git a/arch/arm64/boot/dts/apple/t8112-j493.dts b/arch/arm64/boot/dts/apple/t8112-j493.dts
index 0ad908349f55406783942735a2e9dad54cda00ec..372fe69a96f6b84f576221101a4127d68bb54691 100644
--- a/arch/arm64/boot/dts/apple/t8112-j493.dts
+++ b/arch/arm64/boot/dts/apple/t8112-j493.dts
@@ -35,6 +35,37 @@ led-0 {
 	};
 };
 
+&display_dfr {
+	status = "okay";
+};
+
+&dfr_mipi_out {
+	dfr_mipi_out_panel: endpoint@0 {
+		reg = <0>;
+		remote-endpoint = <&dfr_panel_in>;
+	};
+};
+
+&displaydfr_mipi {
+	status = "okay";
+
+	dfr_panel: panel@0 {
+		compatible = "apple,j493-summit", "apple,summit";
+		reg = <0>;
+		max-brightness = <255>;
+
+		port {
+			dfr_panel_in: endpoint {
+				remote-endpoint = <&dfr_mipi_out_panel>;
+			};
+		};
+	};
+};
+
+&displaydfr_dart {
+	status = "okay";
+};
+
 /*
  * Force the bus number assignments so that we can declare some of the
  * on-board devices and properties that are populated by the bootloader
diff --git a/arch/arm64/boot/dts/apple/t8112.dtsi b/arch/arm64/boot/dts/apple/t8112.dtsi
index 1666e6ab250bc0be9b8318e3c8fc903ccd3f3760..b8d2d22ab81adfb7642ea362c6a6af4c04a9bf9d 100644
--- a/arch/arm64/boot/dts/apple/t8112.dtsi
+++ b/arch/arm64/boot/dts/apple/t8112.dtsi
@@ -379,6 +379,68 @@ cpufreq_p: cpufreq@211e20000 {
 			#performance-domain-cells = <0>;
 		};
 
+		display_dfr: display-pipe@228200000 {
+			compatible = "apple,t8112-display-pipe", "apple,h7-display-pipe";
+			reg-names = "be", "fe";
+			reg = <0x2 0x28200000 0x0 0xc000>,
+				<0x2 0x28400000 0x0 0x4000>;
+			power-domains = <&ps_dispdfr_fe>, <&ps_dispdfr_be>;
+			interrupt-parent = <&aic>;
+			interrupts = <AIC_IRQ 614 IRQ_TYPE_LEVEL_HIGH>,
+				<AIC_IRQ 618 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "be", "fe";
+			iommus = <&displaydfr_dart 0>;
+			status = "disabled";
+
+			port {
+				dfr_adp_out_mipi: endpoint {
+					remote-endpoint = <&dfr_mipi_in_adp>;
+				};
+			};
+		};
+
+		displaydfr_dart: iommu@228304000 {
+			compatible = "apple,t8110-dart";
+			reg = <0x2 0x28304000 0x0 0x4000>;
+			interrupt-parent = <&aic>;
+			interrupts = <AIC_IRQ 616 IRQ_TYPE_LEVEL_HIGH>;
+			#iommu-cells = <1>;
+			power-domains = <&ps_dispdfr_fe>;
+			status = "disabled";
+		};
+
+		displaydfr_mipi: dsi@228600000 {
+			compatible = "apple,t8112-display-pipe-mipi", "apple,h7-display-pipe-mipi";
+			reg-names = "mipi";
+			reg = <0x2 0x28600000 0x0 0x100000>;
+			power-domains = <&ps_mipi_dsi>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				dfr_mipi_in: port@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+
+					dfr_mipi_in_adp: endpoint@0 {
+						reg = <0>;
+						remote-endpoint = <&dfr_adp_out_mipi>;
+					};
+				};
+
+				dfr_mipi_out: port@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+				};
+			};
+		};
+
 		sio_dart: iommu@235004000 {
 			compatible = "apple,t8110-dart";
 			reg = <0x2 0x35004000 0x0 0x4000>;

-- 
2.47.1

Re: [PATCH v2 4/5] arm64: dts: apple: Add touchbar screen nodes

[Krzysztof Kozlowski]

On 26/11/2024 17:34, Sasha Finkelstein via B4 Relay wrote:
>  /*
>   * Force the bus number assignments so that we can declare some of the
>   * on-board devices and properties that are populated by the bootloader
> diff --git a/arch/arm64/boot/dts/apple/t8112.dtsi b/arch/arm64/boot/dts/apple/t8112.dtsi
> index 1666e6ab250bc0be9b8318e3c8fc903ccd3f3760..b8d2d22ab81adfb7642ea362c6a6af4c04a9bf9d 100644
> --- a/arch/arm64/boot/dts/apple/t8112.dtsi
> +++ b/arch/arm64/boot/dts/apple/t8112.dtsi
> @@ -379,6 +379,68 @@ cpufreq_p: cpufreq@211e20000 {
>  			#performance-domain-cells = <0>;
>  		};
>  
> +		display_dfr: display-pipe@228200000 {
> +			compatible = "apple,t8112-display-pipe", "apple,h7-display-pipe";
> +			reg-names = "be", "fe";
> +			reg = <0x2 0x28200000 0x0 0xc000>,
> +				<0x2 0x28400000 0x0 0x4000>;
Please follow DTS coding style in respect of order of properties and
indentation/alignment.

Best regards,
Krzysztof

[PATCH v2 5/5] MAINTAINERS: Add entries for touchbar display driver

[Sasha Finkelstein via B4 Relay]

From: Sasha Finkelstein <fnkl.kernel@gmail.com>

Add the MAINTAINERS entries for the driver

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
---
 MAINTAINERS | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e7f0170977013889ca7c39b17727ba36d32e92dc..9a2fb7cd80e09f24932b91cd33d0cd2b3514b31c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2164,6 +2164,9 @@ F:	Documentation/devicetree/bindings/arm/apple.yaml
 F:	Documentation/devicetree/bindings/arm/apple/*
 F:	Documentation/devicetree/bindings/clock/apple,nco.yaml
 F:	Documentation/devicetree/bindings/cpufreq/apple,cluster-cpufreq.yaml
+F:	Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml
+F:	Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
+F:	Documentation/devicetree/bindings/display/panel/apple,summit.yaml
 F:	Documentation/devicetree/bindings/dma/apple,admac.yaml
 F:	Documentation/devicetree/bindings/i2c/apple,i2c.yaml
 F:	Documentation/devicetree/bindings/interrupt-controller/apple,*
@@ -2183,6 +2186,8 @@ F:	drivers/bluetooth/hci_bcm4377.c
 F:	drivers/clk/clk-apple-nco.c
 F:	drivers/cpufreq/apple-soc-cpufreq.c
 F:	drivers/dma/apple-admac.c
+F:	drivers/gpu/drm/adp/
+F:	drivers/gpu/drm/panel/panel-summit.c
 F:	drivers/pmdomain/apple/
 F:	drivers/i2c/busses/i2c-pasemi-core.c
 F:	drivers/i2c/busses/i2c-pasemi-platform.c

-- 
2.47.1