[PATCH v1 0/7] DRM: add LTDC support for STM32F4

[PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Yannick Fertre]

The purpose of this set of patches is to add a new driver for stm32f429.
This driver was developed and tested on evaluation board stm32429i.

Stm32f4 is a MCU platform which don't have MMU so the last patches developed
by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
are necessary.

The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
A new simple panel am-480272h3tmqw-t01h have been added to support it.

Yannick Fertre (7):
  dt-bindings: display: add STM32 LTDC driver
  drm/st: Add STM32 LTDC driver
  dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
  drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
  ARM: dts: stm32f429: Add ltdc support
  ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
  ARM: configs: Add STM32 LTDC support in STM32 defconfig

 .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
 .../devicetree/bindings/display/st,ltdc.txt        |   57 +
 arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
 arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
 arch/arm/configs/stm32_defconfig                   |    5 +
 drivers/gpu/drm/Kconfig                            |    2 +
 drivers/gpu/drm/Makefile                           |    1 +
 drivers/gpu/drm/panel/panel-simple.c               |   29 +
 drivers/gpu/drm/st/Kconfig                         |   14 +
 drivers/gpu/drm/st/Makefile                        |    7 +
 drivers/gpu/drm/st/drv.c                           |  279 ++++
 drivers/gpu/drm/st/drv.h                           |   25 +
 drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
 drivers/gpu/drm/st/ltdc.h                          |   20 +
 14 files changed, 1966 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
 create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
 create mode 100644 drivers/gpu/drm/st/Kconfig
 create mode 100644 drivers/gpu/drm/st/Makefile
 create mode 100644 drivers/gpu/drm/st/drv.c
 create mode 100644 drivers/gpu/drm/st/drv.h
 create mode 100644 drivers/gpu/drm/st/ltdc.c
 create mode 100644 drivers/gpu/drm/st/ltdc.h

-- 
1.9.1

[PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Yannick Fertre]

The purpose of this set of patches is to add a new driver for stm32f429.
This driver was developed and tested on evaluation board stm32429i.

Stm32f4 is a MCU platform which don't have MMU so the last patches developed
by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
are necessary.

The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
A new simple panel am-480272h3tmqw-t01h have been added to support it.

Yannick Fertre (7):
  dt-bindings: display: add STM32 LTDC driver
  drm/st: Add STM32 LTDC driver
  dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
  drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
  ARM: dts: stm32f429: Add ltdc support
  ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
  ARM: configs: Add STM32 LTDC support in STM32 defconfig

 .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
 .../devicetree/bindings/display/st,ltdc.txt        |   57 +
 arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
 arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
 arch/arm/configs/stm32_defconfig                   |    5 +
 drivers/gpu/drm/Kconfig                            |    2 +
 drivers/gpu/drm/Makefile                           |    1 +
 drivers/gpu/drm/panel/panel-simple.c               |   29 +
 drivers/gpu/drm/st/Kconfig                         |   14 +
 drivers/gpu/drm/st/Makefile                        |    7 +
 drivers/gpu/drm/st/drv.c                           |  279 ++++
 drivers/gpu/drm/st/drv.h                           |   25 +
 drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
 drivers/gpu/drm/st/ltdc.h                          |   20 +
 14 files changed, 1966 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
 create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
 create mode 100644 drivers/gpu/drm/st/Kconfig
 create mode 100644 drivers/gpu/drm/st/Makefile
 create mode 100644 drivers/gpu/drm/st/drv.c
 create mode 100644 drivers/gpu/drm/st/drv.h
 create mode 100644 drivers/gpu/drm/st/ltdc.c
 create mode 100644 drivers/gpu/drm/st/ltdc.h

-- 
1.9.1

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[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt

diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt b/Documentation/devicetree/bindings/display/st,ltdc.txt
new file mode 100644
index 0000000..20e89da
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
@@ -0,0 +1,57 @@
+* STMicroelectronics STM32 lcd-tft display controller
+
+- st-display-subsystem: Master device for DRM sub-components
+  This device must be the parent of all the sub-components and is responsible
+  of bind them.
+  Required properties:
+  - compatible: "st,display-subsystem"
+  - ranges: to allow probing of subdevices
+
+- ltdc_host: lcd-tft display controller host
+  must be a sub-node of st-display-subsystem
+  Required properties:
+  - compatible: "st,ltdc"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+  - resets: resets to be used by the device
+    See ../reset/reset.txt for details.
+  - reset-names: names of the resets listed in resets property in the same
+    order.
+  Required nodes:
+    - Video port for RGB output.
+
+Example:
+
+/ {
+	...
+	soc {
+	...
+		st-display-subsystem {
+			compatible = "st,display-subsystem";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+			dma-ranges;
+
+			ltdc_host: stm32-ltdc at 40016800 {
+				compatible = "st,ltdc";
+				reg = <0x40016800 0x200>;
+				interrupts = <88>, <89>;
+				resets = <&rcc 314>;
+				clocks = <&rcc 1 8>;
+				clock-names = "clk-lcd";
+				status = "disabled";
+
+				port {
+					ltdc_out_rgb: endpoint {
+					};
+				};
+			};
+		};
+	...
+	};
+};
-- 
1.9.1

[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt

diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt b/Documentation/devicetree/bindings/display/st,ltdc.txt
new file mode 100644
index 0000000..20e89da
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
@@ -0,0 +1,57 @@
+* STMicroelectronics STM32 lcd-tft display controller
+
+- st-display-subsystem: Master device for DRM sub-components
+  This device must be the parent of all the sub-components and is responsible
+  of bind them.
+  Required properties:
+  - compatible: "st,display-subsystem"
+  - ranges: to allow probing of subdevices
+
+- ltdc_host: lcd-tft display controller host
+  must be a sub-node of st-display-subsystem
+  Required properties:
+  - compatible: "st,ltdc"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+  - resets: resets to be used by the device
+    See ../reset/reset.txt for details.
+  - reset-names: names of the resets listed in resets property in the same
+    order.
+  Required nodes:
+    - Video port for RGB output.
+
+Example:
+
+/ {
+	...
+	soc {
+	...
+		st-display-subsystem {
+			compatible = "st,display-subsystem";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+			dma-ranges;
+
+			ltdc_host: stm32-ltdc@40016800 {
+				compatible = "st,ltdc";
+				reg = <0x40016800 0x200>;
+				interrupts = <88>, <89>;
+				resets = <&rcc 314>;
+				clocks = <&rcc 1 8>;
+				clock-names = "clk-lcd";
+				status = "disabled";
+
+				port {
+					ltdc_out_rgb: endpoint {
+					};
+				};
+			};
+		};
+	...
+	};
+};
-- 
1.9.1

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[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Laurent Pinchart]

Hi Yannick,

Thank you for the patch.

On Monday 16 Jan 2017 14:28:58 Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---
>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt
> b/Documentation/devicetree/bindings/display/st,ltdc.txt new file mode
> 100644
> index 0000000..20e89da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
> @@ -0,0 +1,57 @@
> +* STMicroelectronics STM32 lcd-tft display controller
> +
> +- st-display-subsystem: Master device for DRM sub-components
> +  This device must be the parent of all the sub-components and is
> responsible
> +  of bind them.

Why do you need this ? At a quick glance the ltdc node should be enough.

> +  Required properties:
> +  - compatible: "st,display-subsystem"
> +  - ranges: to allow probing of subdevices
> +
> +- ltdc_host: lcd-tft display controller host
> +  must be a sub-node of st-display-subsystem
> +  Required properties:
> +  - compatible: "st,ltdc"
> +  - reg: Physical base address of the IP registers and length of memory
> mapped region.
> +  - clocks: from common clock binding: handle hardware IP needed clocks,
> the
> +    number of clocks may depend of the SoC type.
> +    See ../clocks/clock-bindings.txt for details.
> +  - clock-names: names of the clocks listed in clocks property in the same
> +    order.

You need to define the required/optional clocks with their names here. If they 
vary depending on the SoC, the DT bindings document need to list them for each 
SoC.

> +  - resets: resets to be used by the device
> +    See ../reset/reset.txt for details.
> +  - reset-names: names of the resets listed in resets property in the same
> +    order.
> +  Required nodes:
> +    - Video port for RGB output.
> +
> +Example:
> +
> +/ {
> +	...
> +	soc {
> +	...
> +		st-display-subsystem {
> +			compatible = "st,display-subsystem";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			dma-ranges;
> +
> +			ltdc_host: stm32-ltdc at 40016800 {
> +				compatible = "st,ltdc";
> +				reg = <0x40016800 0x200>;
> +				interrupts = <88>, <89>;
> +				resets = <&rcc 314>;
> +				clocks = <&rcc 1 8>;
> +				clock-names = "clk-lcd";
> +				status = "disabled";
> +
> +				port {
> +					ltdc_out_rgb: endpoint {
> +					};
> +				};
> +			};
> +		};
> +	...
> +	};
> +};

-- 
Regards,

Laurent Pinchart

Re: [PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Laurent Pinchart]

Hi Yannick,

Thank you for the patch.

On Monday 16 Jan 2017 14:28:58 Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---
>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt
> b/Documentation/devicetree/bindings/display/st,ltdc.txt new file mode
> 100644
> index 0000000..20e89da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
> @@ -0,0 +1,57 @@
> +* STMicroelectronics STM32 lcd-tft display controller
> +
> +- st-display-subsystem: Master device for DRM sub-components
> +  This device must be the parent of all the sub-components and is
> responsible
> +  of bind them.

Why do you need this ? At a quick glance the ltdc node should be enough.

> +  Required properties:
> +  - compatible: "st,display-subsystem"
> +  - ranges: to allow probing of subdevices
> +
> +- ltdc_host: lcd-tft display controller host
> +  must be a sub-node of st-display-subsystem
> +  Required properties:
> +  - compatible: "st,ltdc"
> +  - reg: Physical base address of the IP registers and length of memory
> mapped region.
> +  - clocks: from common clock binding: handle hardware IP needed clocks,
> the
> +    number of clocks may depend of the SoC type.
> +    See ../clocks/clock-bindings.txt for details.
> +  - clock-names: names of the clocks listed in clocks property in the same
> +    order.

You need to define the required/optional clocks with their names here. If they 
vary depending on the SoC, the DT bindings document need to list them for each 
SoC.

> +  - resets: resets to be used by the device
> +    See ../reset/reset.txt for details.
> +  - reset-names: names of the resets listed in resets property in the same
> +    order.
> +  Required nodes:
> +    - Video port for RGB output.
> +
> +Example:
> +
> +/ {
> +	...
> +	soc {
> +	...
> +		st-display-subsystem {
> +			compatible = "st,display-subsystem";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			dma-ranges;
> +
> +			ltdc_host: stm32-ltdc@40016800 {
> +				compatible = "st,ltdc";
> +				reg = <0x40016800 0x200>;
> +				interrupts = <88>, <89>;
> +				resets = <&rcc 314>;
> +				clocks = <&rcc 1 8>;
> +				clock-names = "clk-lcd";
> +				status = "disabled";
> +
> +				port {
> +					ltdc_out_rgb: endpoint {
> +					};
> +				};
> +			};
> +		};
> +	...
> +	};
> +};

-- 
Regards,

Laurent Pinchart

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[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Yannick FERTRE]

On 01/16/2017 09:30 PM, Laurent Pinchart wrote:
> Hi Yannick,
>
> Thank you for the patch.
>
> On Monday 16 Jan 2017 14:28:58 Yannick Fertre wrote:
>> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
>> ---
>>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++
>>  1 file changed, 57 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt
>> b/Documentation/devicetree/bindings/display/st,ltdc.txt new file mode
>> 100644
>> index 0000000..20e89da
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
>> @@ -0,0 +1,57 @@
>> +* STMicroelectronics STM32 lcd-tft display controller
>> +
>> +- st-display-subsystem: Master device for DRM sub-components
>> +  This device must be the parent of all the sub-components and is
>> responsible
>> +  of bind them.
>
> Why do you need this ? At a quick glance the ltdc node should be enough.
Hi Laurent,
To prepare next device upstream of dsi, we need a master node 
"st-display-subsystem" and a sub node "st,ltdc". It's the same kind of 
node than st,stih4xx.
>
>> +  Required properties:
>> +  - compatible: "st,display-subsystem"
>> +  - ranges: to allow probing of subdevices
>> +
>> +- ltdc_host: lcd-tft display controller host
>> +  must be a sub-node of st-display-subsystem
>> +  Required properties:
>> +  - compatible: "st,ltdc"
>> +  - reg: Physical base address of the IP registers and length of memory
>> mapped region.
>> +  - clocks: from common clock binding: handle hardware IP needed clocks,
>> the
>> +    number of clocks may depend of the SoC type.
>> +    See ../clocks/clock-bindings.txt for details.
>> +  - clock-names: names of the clocks listed in clocks property in the same
>> +    order.
>
> You need to define the required/optional clocks with their names here. If they
> vary depending on the SoC, the DT bindings document need to list them for each
> SoC.
>
Ok, I'll push news bindings with pack V2.
>> +  - resets: resets to be used by the device
>> +    See ../reset/reset.txt for details.
>> +  - reset-names: names of the resets listed in resets property in the same
>> +    order.
>> +  Required nodes:
>> +    - Video port for RGB output.
>> +
>> +Example:
>> +
>> +/ {
>> +	...
>> +	soc {
>> +	...
>> +		st-display-subsystem {
>> +			compatible = "st,display-subsystem";
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			ranges;
>> +			dma-ranges;
>> +
>> +			ltdc_host: stm32-ltdc at 40016800 {
>> +				compatible = "st,ltdc";
>> +				reg = <0x40016800 0x200>;
>> +				interrupts = <88>, <89>;
>> +				resets = <&rcc 314>;
>> +				clocks = <&rcc 1 8>;
>> +				clock-names = "clk-lcd";
>> +				status = "disabled";
>> +
>> +				port {
>> +					ltdc_out_rgb: endpoint {
>> +					};
>> +				};
>> +			};
>> +		};
>> +	...
>> +	};
>> +};
>

Re: [PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Yannick FERTRE]

On 01/16/2017 09:30 PM, Laurent Pinchart wrote:
> Hi Yannick,
>
> Thank you for the patch.
>
> On Monday 16 Jan 2017 14:28:58 Yannick Fertre wrote:
>> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
>> ---
>>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++
>>  1 file changed, 57 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt
>> b/Documentation/devicetree/bindings/display/st,ltdc.txt new file mode
>> 100644
>> index 0000000..20e89da
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
>> @@ -0,0 +1,57 @@
>> +* STMicroelectronics STM32 lcd-tft display controller
>> +
>> +- st-display-subsystem: Master device for DRM sub-components
>> +  This device must be the parent of all the sub-components and is
>> responsible
>> +  of bind them.
>
> Why do you need this ? At a quick glance the ltdc node should be enough.
Hi Laurent,
To prepare next device upstream of dsi, we need a master node 
"st-display-subsystem" and a sub node "st,ltdc". It's the same kind of 
node than st,stih4xx.
>
>> +  Required properties:
>> +  - compatible: "st,display-subsystem"
>> +  - ranges: to allow probing of subdevices
>> +
>> +- ltdc_host: lcd-tft display controller host
>> +  must be a sub-node of st-display-subsystem
>> +  Required properties:
>> +  - compatible: "st,ltdc"
>> +  - reg: Physical base address of the IP registers and length of memory
>> mapped region.
>> +  - clocks: from common clock binding: handle hardware IP needed clocks,
>> the
>> +    number of clocks may depend of the SoC type.
>> +    See ../clocks/clock-bindings.txt for details.
>> +  - clock-names: names of the clocks listed in clocks property in the same
>> +    order.
>
> You need to define the required/optional clocks with their names here. If they
> vary depending on the SoC, the DT bindings document need to list them for each
> SoC.
>
Ok, I'll push news bindings with pack V2.
>> +  - resets: resets to be used by the device
>> +    See ../reset/reset.txt for details.
>> +  - reset-names: names of the resets listed in resets property in the same
>> +    order.
>> +  Required nodes:
>> +    - Video port for RGB output.
>> +
>> +Example:
>> +
>> +/ {
>> +	...
>> +	soc {
>> +	...
>> +		st-display-subsystem {
>> +			compatible = "st,display-subsystem";
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			ranges;
>> +			dma-ranges;
>> +
>> +			ltdc_host: stm32-ltdc@40016800 {
>> +				compatible = "st,ltdc";
>> +				reg = <0x40016800 0x200>;
>> +				interrupts = <88>, <89>;
>> +				resets = <&rcc 314>;
>> +				clocks = <&rcc 1 8>;
>> +				clock-names = "clk-lcd";
>> +				status = "disabled";
>> +
>> +				port {
>> +					ltdc_out_rgb: endpoint {
>> +					};
>> +				};
>> +			};
>> +		};
>> +	...
>> +	};
>> +};
>
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[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Rob Herring]

On Thu, Jan 19, 2017 at 04:16:01PM +0000, Yannick FERTRE wrote:
> On 01/16/2017 09:30 PM, Laurent Pinchart wrote:
> > Hi Yannick,
> >
> > Thank you for the patch.
> >
> > On Monday 16 Jan 2017 14:28:58 Yannick Fertre wrote:
> >> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> >> ---
> >>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++
> >>  1 file changed, 57 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt
> >> b/Documentation/devicetree/bindings/display/st,ltdc.txt new file mode
> >> 100644
> >> index 0000000..20e89da
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
> >> @@ -0,0 +1,57 @@
> >> +* STMicroelectronics STM32 lcd-tft display controller
> >> +
> >> +- st-display-subsystem: Master device for DRM sub-components
> >> +  This device must be the parent of all the sub-components and is
> >> responsible
> >> +  of bind them.
> >
> > Why do you need this ? At a quick glance the ltdc node should be enough.
> Hi Laurent,
> To prepare next device upstream of dsi, we need a master node 
> "st-display-subsystem" and a sub node "st,ltdc". It's the same kind of 
> node than st,stih4xx.

No, you don't. That's what OF graph is for. The DRM driver binds to the 
LCD controller node and walks the graph to find the DSI node and then 
the panel.

Rob

Re: [PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Rob Herring]

On Thu, Jan 19, 2017 at 04:16:01PM +0000, Yannick FERTRE wrote:
> On 01/16/2017 09:30 PM, Laurent Pinchart wrote:
> > Hi Yannick,
> >
> > Thank you for the patch.
> >
> > On Monday 16 Jan 2017 14:28:58 Yannick Fertre wrote:
> >> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> >> ---
> >>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++
> >>  1 file changed, 57 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt
> >> b/Documentation/devicetree/bindings/display/st,ltdc.txt new file mode
> >> 100644
> >> index 0000000..20e89da
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
> >> @@ -0,0 +1,57 @@
> >> +* STMicroelectronics STM32 lcd-tft display controller
> >> +
> >> +- st-display-subsystem: Master device for DRM sub-components
> >> +  This device must be the parent of all the sub-components and is
> >> responsible
> >> +  of bind them.
> >
> > Why do you need this ? At a quick glance the ltdc node should be enough.
> Hi Laurent,
> To prepare next device upstream of dsi, we need a master node 
> "st-display-subsystem" and a sub node "st,ltdc". It's the same kind of 
> node than st,stih4xx.

No, you don't. That's what OF graph is for. The DRM driver binds to the 
LCD controller node and walks the graph to find the DSI node and then 
the panel.

Rob
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[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Rob Herring]

On Mon, Jan 16, 2017 at 02:28:58PM +0100, Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>

Changelog?

> ---
>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt b/Documentation/devicetree/bindings/display/st,ltdc.txt
> new file mode 100644
> index 0000000..20e89da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
> @@ -0,0 +1,57 @@
> +* STMicroelectronics STM32 lcd-tft display controller
> +
> +- st-display-subsystem: Master device for DRM sub-components
> +  This device must be the parent of all the sub-components and is responsible
> +  of bind them.
> +  Required properties:
> +  - compatible: "st,display-subsystem"
> +  - ranges: to allow probing of subdevices

You have a single sub device. There is no need for this node.


> +- ltdc_host: lcd-tft display controller host
> +  must be a sub-node of st-display-subsystem
> +  Required properties:
> +  - compatible: "st,ltdc"

Too generic. Needs to be SoC specific.

> +  - reg: Physical base address of the IP registers and length of memory mapped region.
> +  - clocks: from common clock binding: handle hardware IP needed clocks, the
> +    number of clocks may depend of the SoC type.

No. You must be explicit on how many clocks and their order.

> +    See ../clocks/clock-bindings.txt for details.
> +  - clock-names: names of the clocks listed in clocks property in the same
> +    order.
> +  - resets: resets to be used by the device

ditto.

> +    See ../reset/reset.txt for details.
> +  - reset-names: names of the resets listed in resets property in the same
> +    order.

You are missing this in the example. However, for a single entry, -names 
is pointless.

> +  Required nodes:
> +    - Video port for RGB output.
> +
> +Example:
> +
> +/ {
> +	...
> +	soc {
> +	...
> +		st-display-subsystem {
> +			compatible = "st,display-subsystem";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			dma-ranges;
> +
> +			ltdc_host: stm32-ltdc at 40016800 {
> +				compatible = "st,ltdc";
> +				reg = <0x40016800 0x200>;
> +				interrupts = <88>, <89>;
> +				resets = <&rcc 314>;
> +				clocks = <&rcc 1 8>;
> +				clock-names = "clk-lcd";

The 'clk-' part is redundant.

> +				status = "disabled";
> +
> +				port {
> +					ltdc_out_rgb: endpoint {
> +					};
> +				};
> +			};
> +		};
> +	...
> +	};
> +};
> -- 
> 1.9.1
> 

Re: [PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Rob Herring]

On Mon, Jan 16, 2017 at 02:28:58PM +0100, Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre-qxv4g6HH51o@public.gmane.org>

Changelog?

> ---
>  .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt b/Documentation/devicetree/bindings/display/st,ltdc.txt
> new file mode 100644
> index 0000000..20e89da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
> @@ -0,0 +1,57 @@
> +* STMicroelectronics STM32 lcd-tft display controller
> +
> +- st-display-subsystem: Master device for DRM sub-components
> +  This device must be the parent of all the sub-components and is responsible
> +  of bind them.
> +  Required properties:
> +  - compatible: "st,display-subsystem"
> +  - ranges: to allow probing of subdevices

You have a single sub device. There is no need for this node.


> +- ltdc_host: lcd-tft display controller host
> +  must be a sub-node of st-display-subsystem
> +  Required properties:
> +  - compatible: "st,ltdc"

Too generic. Needs to be SoC specific.

> +  - reg: Physical base address of the IP registers and length of memory mapped region.
> +  - clocks: from common clock binding: handle hardware IP needed clocks, the
> +    number of clocks may depend of the SoC type.

No. You must be explicit on how many clocks and their order.

> +    See ../clocks/clock-bindings.txt for details.
> +  - clock-names: names of the clocks listed in clocks property in the same
> +    order.
> +  - resets: resets to be used by the device

ditto.

> +    See ../reset/reset.txt for details.
> +  - reset-names: names of the resets listed in resets property in the same
> +    order.

You are missing this in the example. However, for a single entry, -names 
is pointless.

> +  Required nodes:
> +    - Video port for RGB output.
> +
> +Example:
> +
> +/ {
> +	...
> +	soc {
> +	...
> +		st-display-subsystem {
> +			compatible = "st,display-subsystem";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			dma-ranges;
> +
> +			ltdc_host: stm32-ltdc@40016800 {
> +				compatible = "st,ltdc";
> +				reg = <0x40016800 0x200>;
> +				interrupts = <88>, <89>;
> +				resets = <&rcc 314>;
> +				clocks = <&rcc 1 8>;
> +				clock-names = "clk-lcd";

The 'clk-' part is redundant.

> +				status = "disabled";
> +
> +				port {
> +					ltdc_out_rgb: endpoint {
> +					};
> +				};
> +			};
> +		};
> +	...
> +	};
> +};
> -- 
> 1.9.1
> 
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[PATCH v1 2/7] drm/st: Add STM32 LTDC driver

[Yannick Fertre]

This patch adds support for the STM32 LCD-TFT display controller.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 drivers/gpu/drm/Kconfig     |    2 +
 drivers/gpu/drm/Makefile    |    1 +
 drivers/gpu/drm/st/Kconfig  |   14 +
 drivers/gpu/drm/st/Makefile |    7 +
 drivers/gpu/drm/st/drv.c    |  279 +++++++++
 drivers/gpu/drm/st/drv.h    |   25 +
 drivers/gpu/drm/st/ltdc.c   | 1438 +++++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/st/ltdc.h   |   20 +
 8 files changed, 1786 insertions(+)
 create mode 100644 drivers/gpu/drm/st/Kconfig
 create mode 100644 drivers/gpu/drm/st/Makefile
 create mode 100644 drivers/gpu/drm/st/drv.c
 create mode 100644 drivers/gpu/drm/st/drv.h
 create mode 100644 drivers/gpu/drm/st/ltdc.c
 create mode 100644 drivers/gpu/drm/st/ltdc.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 6f3f9e6..d8e6f92 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -237,6 +237,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig"
 
 source "drivers/gpu/drm/tegra/Kconfig"
 
+source "drivers/gpu/drm/st/Kconfig"
+
 source "drivers/gpu/drm/panel/Kconfig"
 
 source "drivers/gpu/drm/bridge/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 92de399..7434c09 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
 obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
 obj-$(CONFIG_DRM_MSM) += msm/
 obj-$(CONFIG_DRM_TEGRA) += tegra/
+obj-$(CONFIG_DRM_ST) += st/
 obj-$(CONFIG_DRM_STI) += sti/
 obj-$(CONFIG_DRM_IMX) += imx/
 obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
diff --git a/drivers/gpu/drm/st/Kconfig b/drivers/gpu/drm/st/Kconfig
new file mode 100644
index 0000000..fa0ac0c
--- /dev/null
+++ b/drivers/gpu/drm/st/Kconfig
@@ -0,0 +1,14 @@
+config DRM_ST
+	tristate "DRM Support for STMicroelectronics SoC Series"
+	depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)
+	select DRM_KMS_HELPER
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_PANEL
+	select VIDEOMODE_HELPERS
+	select FB_PROVIDE_GET_FB_UNMAPPED_AREA
+	help
+	  Choose this option if you have an ST STMicroelectronics SoC.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called st-drm.
diff --git a/drivers/gpu/drm/st/Makefile b/drivers/gpu/drm/st/Makefile
new file mode 100644
index 0000000..b2a9025
--- /dev/null
+++ b/drivers/gpu/drm/st/Makefile
@@ -0,0 +1,7 @@
+ccflags-y := -Iinclude/drm
+
+st-drm-y := \
+	drv.o \
+	ltdc.o
+
+obj-$(CONFIG_DRM_ST) += st-drm.o
diff --git a/drivers/gpu/drm/st/drv.c b/drivers/gpu/drm/st/drv.c
new file mode 100644
index 0000000..a275019
--- /dev/null
+++ b/drivers/gpu/drm/st/drv.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/component.h>
+#include <linux/of_platform.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "drv.h"
+#include "ltdc.h"
+
+#define DRIVER_NAME	"st"
+#define DRIVER_DESC	"STMicroelectronics SoC DRM"
+#define DRIVER_DATE	"20170110"
+#define DRIVER_MAJOR	1
+#define DRIVER_MINOR	0
+
+#define ST_MAX_FB_WIDTH		2048
+#define ST_MAX_FB_HEIGHT	2048 /* same as width to handle orientation */
+
+static void st_output_poll_changed(struct drm_device *ddev)
+{
+	struct st_private *priv = ddev->dev_private;
+
+	drm_fbdev_cma_hotplug_event(priv->fbdev);
+}
+
+static const struct drm_mode_config_funcs st_mode_config_funcs = {
+	.fb_create = drm_fb_cma_create,
+	.output_poll_changed = st_output_poll_changed,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static void st_mode_config_init(struct drm_device *ddev)
+{
+	ddev->mode_config.min_width = 0;
+	ddev->mode_config.min_height = 0;
+
+	/*
+	 * set max width and height as default value.
+	 * this value would be used to check framebuffer size limitation
+	 * at drm_mode_addfb().
+	 */
+	ddev->mode_config.max_width = ST_MAX_FB_WIDTH;
+	ddev->mode_config.max_height = ST_MAX_FB_HEIGHT;
+	ddev->mode_config.funcs = &st_mode_config_funcs;
+}
+
+static const struct file_operations st_driver_fops = {
+	.owner = THIS_MODULE,
+	.open = drm_open,
+	.get_unmapped_area = drm_gem_cma_get_unmapped_area,
+	.mmap = drm_gem_cma_mmap,
+	.poll = drm_poll,
+	.read = drm_read,
+	.unlocked_ioctl = drm_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = drm_compat_ioctl,
+#endif
+	.release = drm_release,
+};
+
+static struct drm_driver st_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
+			   DRIVER_ATOMIC,
+	.gem_free_object_unlocked = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+	.dumb_create = drm_gem_cma_dumb_create,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.dumb_destroy = drm_gem_dumb_destroy,
+	.fops = &st_driver_fops,
+
+	.get_vblank_counter = drm_vblank_no_hw_counter,
+	.enable_vblank = ltdc_crtc_enable_vblank,
+	.disable_vblank = ltdc_crtc_disable_vblank,
+
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap = drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap = drm_gem_cma_prime_mmap,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+};
+
+static int compare_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+static int st_init(struct drm_device *ddev)
+{
+	struct st_private *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ddev->dev_private = (void *)priv;
+	dev_set_drvdata(ddev->dev, ddev);
+	priv->ddev = ddev;
+
+	drm_mode_config_init(ddev);
+
+	st_mode_config_init(ddev);
+
+	drm_kms_helper_poll_init(ddev);
+
+	return 0;
+}
+
+static void st_cleanup(struct drm_device *ddev)
+{
+	struct st_private *priv = ddev->dev_private;
+
+	if (priv->fbdev) {
+		drm_fbdev_cma_fini(priv->fbdev);
+		priv->fbdev = NULL;
+	}
+
+	drm_kms_helper_poll_fini(ddev);
+	drm_vblank_cleanup(ddev);
+	kfree(priv);
+	ddev->dev_private = NULL;
+}
+
+static int st_bind(struct device *dev)
+{
+	struct drm_device *ddev;
+	struct st_private *priv;
+	struct drm_fbdev_cma *fbdev;
+	int ret;
+
+	ddev = drm_dev_alloc(&st_driver, dev);
+	if (IS_ERR(ddev))
+		return PTR_ERR(ddev);
+
+	ddev->platformdev = to_platform_device(dev);
+
+	ret = st_init(ddev);
+	if (ret)
+		goto err_drm_dev_unref;
+
+	ret = component_bind_all(ddev->dev, ddev);
+	if (ret)
+		goto err_cleanup;
+
+	ret = drm_dev_register(ddev, 0);
+	if (ret)
+		goto err_register;
+
+	drm_mode_config_reset(ddev);
+
+	if (ddev->mode_config.num_connector) {
+		priv = ddev->dev_private;
+		fbdev = drm_fbdev_cma_init(ddev, 16,
+					   ddev->mode_config.num_crtc,
+					   ddev->mode_config.num_connector);
+		if (IS_ERR(fbdev)) {
+			DRM_DEBUG_DRIVER("Warning: fails to create fbdev\n");
+			fbdev = NULL;
+		}
+		priv->fbdev = fbdev;
+	}
+
+	return 0;
+
+err_register:
+	component_unbind_all(ddev->dev, ddev);
+err_cleanup:
+	st_cleanup(ddev);
+err_drm_dev_unref:
+	drm_dev_unref(ddev);
+	return ret;
+}
+
+static void st_unbind(struct device *dev)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+
+	drm_dev_unregister(ddev);
+	st_cleanup(ddev);
+	drm_dev_unref(ddev);
+}
+
+static const struct component_master_ops st_ops = {
+	.bind = st_bind,
+	.unbind = st_unbind,
+};
+
+static int st_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct device_node *child_np;
+	struct component_match *match = NULL;
+
+	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+
+	of_platform_populate(node, NULL, NULL, dev);
+
+	child_np = of_get_next_available_child(node, NULL);
+
+	while (child_np) {
+		component_match_add(dev, &match, compare_of, child_np);
+		of_node_put(child_np);
+		child_np = of_get_next_available_child(node, child_np);
+	}
+
+	return component_master_add_with_match(dev, &st_ops, match);
+}
+
+static int st_platform_remove(struct platform_device *pdev)
+{
+	component_master_del(&pdev->dev, &st_ops);
+	of_platform_depopulate(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id st_dt_ids[] = {
+	{ .compatible = "st,display-subsystem", },
+	{ /* end node */ },
+};
+MODULE_DEVICE_TABLE(of, st_dt_ids);
+
+static struct platform_driver st_platform_driver = {
+	.probe = st_platform_probe,
+	.remove = st_platform_remove,
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = st_dt_ids,
+	},
+};
+
+static struct platform_driver * const drivers[] = {
+	&ltdc_driver,
+	&st_platform_driver,
+};
+
+static int st_drm_init(void)
+{
+	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_init(st_drm_init);
+
+static void st_drm_exit(void)
+{
+	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_exit(st_drm_exit);
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/st/drv.h b/drivers/gpu/drm/st/drv.h
new file mode 100644
index 0000000..d3da1bc
--- /dev/null
+++ b/drivers/gpu/drm/st/drv.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _DRV_H_
+#define _DRV_H_
+
+#include <drm/drmP.h>
+
+struct st_private {
+	struct ltdc *ltdc;
+	struct drm_device *ddev;
+	struct drm_fbdev_cma *fbdev;
+};
+
+extern struct platform_driver ltdc_driver;
+
+#endif
diff --git a/drivers/gpu/drm/st/ltdc.c b/drivers/gpu/drm/st/ltdc.c
new file mode 100644
index 0000000..46a7ab2
--- /dev/null
+++ b/drivers/gpu/drm/st/ltdc.c
@@ -0,0 +1,1438 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_address.h>
+#include <linux/of_graph.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_plane_helper.h>
+
+#include <video/videomode.h>
+
+#include "drv.h"
+#include "ltdc.h"
+
+#define NB_CRTC 1
+#define CRTC_MASK GENMASK(NB_CRTC - 1, 0)
+
+#define MAX_IRQ 4
+
+#define HWVER_10200 0x010200
+#define HWVER_10300 0x010300
+#define HWVER_20101 0x020101
+
+/*
+ * The address of some registers depends on the HW version: such registers have
+ * an extra offset specified with reg_ofs.
+ */
+#define REG_OFS_NONE	0
+#define REG_OFS_4	4 /* Insertion of "Layer Configuration 2" reg */
+#define REG_OFS		(ltdc->caps.reg_ofs)
+#define LAY_OFS		0x80	/* Register Offset between 2 layers */
+
+/* Global register offsets */
+#define LTDC_IDR	0x0000 /* IDentification */
+#define LTDC_LCR	0x0004 /* Layer Count */
+#define LTDC_SSCR	0x0008 /* Synchronization Size Configuration */
+#define LTDC_BPCR	0x000C /* Back Porch Configuration */
+#define LTDC_AWCR	0x0010 /* Active Width Configuration */
+#define LTDC_TWCR	0x0014 /* Total Width Configuration */
+#define LTDC_GCR	0x0018 /* Global Control */
+#define LTDC_GC1R	0x001C /* Global Configuration 1 */
+#define LTDC_GC2R	0x0020 /* Global Configuration 2 */
+#define LTDC_SRCR	0x0024 /* Shadow Reload Configuration */
+#define LTDC_GACR	0x0028 /* GAmma Correction */
+#define LTDC_BCCR	0x002C /* Background Color Configuration */
+#define LTDC_IER	0x0034 /* Interrupt Enable */
+#define LTDC_ISR	0x0038 /* Interrupt Status */
+#define LTDC_ICR	0x003C /* Interrupt Clear */
+#define LTDC_LIPCR	0x0040 /* Line Interrupt Position Configuration */
+#define LTDC_CPSR	0x0044 /* Current Position Status */
+#define LTDC_CDSR	0x0048 /* Current Display Status */
+
+/* Layer register offsets */
+#define LTDC_L1LC1R	(0x0080)	   /* L1 Layer Configuration 1 */
+#define LTDC_L1LC2R	(0x0084)	   /* L1 Layer Configuration 2 */
+#define LTDC_L1CR	(0x0084 + REG_OFS) /* L1 Control */
+#define LTDC_L1WHPCR	(0x0088 + REG_OFS) /* L1 Window Hor Position Config */
+#define LTDC_L1WVPCR	(0x008C + REG_OFS) /* L1 Window Vert Position Config */
+#define LTDC_L1CKCR	(0x0090 + REG_OFS) /* L1 Color Keying Configuration */
+#define LTDC_L1PFCR	(0x0094 + REG_OFS) /* L1 Pixel Format Configuration */
+#define LTDC_L1CACR	(0x0098 + REG_OFS) /* L1 Constant Alpha Config */
+#define LTDC_L1DCCR	(0x009C + REG_OFS) /* L1 Default Color Configuration */
+#define LTDC_L1BFCR	(0x00A0 + REG_OFS) /* L1 Blend Factors Configuration */
+#define LTDC_L1FBBCR	(0x00A4 + REG_OFS) /* L1 FrameBuffer Bus Control */
+#define LTDC_L1AFBCR	(0x00A8 + REG_OFS) /* L1 AuxFB Control */
+#define LTDC_L1CFBAR	(0x00AC + REG_OFS) /* L1 Color FrameBuffer Address */
+#define LTDC_L1CFBLR	(0x00B0 + REG_OFS) /* L1 Color FrameBuffer Length */
+#define LTDC_L1CFBLNR	(0x00B4 + REG_OFS) /* L1 Color FrameBuffer Line Nb */
+#define LTDC_L1AFBAR	(0x00B8 + REG_OFS) /* L1 AuxFB Address */
+#define LTDC_L1AFBLR	(0x00BC + REG_OFS) /* L1 AuxFB Length */
+#define LTDC_L1AFBLNR	(0x00C0 + REG_OFS) /* L1 AuxFB Line Number */
+#define LTDC_L1CLUTWR	(0x00C4 + REG_OFS) /* L1 CLUT Write */
+#define LTDC_L1YS1R	(0x00E0 + REG_OFS) /* L1 YCbCr Scale 1 */
+#define LTDC_L1YS2R	(0x00E4 + REG_OFS) /* L1 YCbCr Scale 2 */
+
+/* Bit definitions */
+#define SSCR_VSH	GENMASK(10, 0)	/* Vertical Synchronization Height */
+#define SSCR_HSW	GENMASK(27, 16)	/* Horizontal Synchronization Width */
+
+#define BPCR_AVBP	GENMASK(10, 0)	/* Accumulated Vertical Back Porch */
+#define BPCR_AHBP	GENMASK(27, 16)	/* Accumulated Horizontal Back Porch */
+
+#define AWCR_AAH	GENMASK(10, 0)	/* Accumulated Active Height */
+#define AWCR_AAW	GENMASK(27, 16)	/* Accumulated Active Width */
+
+#define TWCR_TOTALH	GENMASK(10, 0)	/* TOTAL Height */
+#define TWCR_TOTALW	GENMASK(27, 16)	/* TOTAL Width */
+
+#define GCR_LTDCEN	BIT(0)		/* LTDC ENable */
+#define GCR_DEN		BIT(16)		/* Dither ENable */
+#define GCR_PCPOL	BIT(28)		/* Pixel Clock POLarity */
+#define GCR_DEPOL	BIT(29)		/* Data Enable POLarity */
+#define GCR_VSPOL	BIT(30)		/* Vertical Synchro POLarity */
+#define GCR_HSPOL	BIT(31)		/* Horizontal Synchro POLarity */
+
+#define GC1R_WBCH	GENMASK(3, 0)	/* Width of Blue CHannel output */
+#define GC1R_WGCH	GENMASK(7, 4)	/* Width of Green Channel output */
+#define GC1R_WRCH	GENMASK(11, 8)	/* Width of Red Channel output */
+#define GC1R_PBEN	BIT(12)		/* Precise Blending ENable */
+#define GC1R_DT		GENMASK(15, 14)	/* Dithering Technique */
+#define GC1R_GCT	GENMASK(19, 17)	/* Gamma Correction Technique */
+#define GC1R_SHREN	BIT(21)		/* SHadow Registers ENabled */
+#define GC1R_BCP	BIT(22)		/* Background Colour Programmable */
+#define GC1R_BBEN	BIT(23)		/* Background Blending ENabled */
+#define GC1R_LNIP	BIT(24)		/* Line Number IRQ Position */
+#define GC1R_TP		BIT(25)		/* Timing Programmable */
+#define GC1R_IPP	BIT(26)		/* IRQ Polarity Programmable */
+#define GC1R_SPP	BIT(27)		/* Sync Polarity Programmable */
+#define GC1R_DWP	BIT(28)		/* Dither Width Programmable */
+#define GC1R_STREN	BIT(29)		/* STatus Registers ENabled */
+#define GC1R_BMEN	BIT(31)		/* Blind Mode ENabled */
+
+#define GC2R_EDCA	BIT(0)		/* External Display Control Ability  */
+#define GC2R_STSAEN	BIT(1)		/* Slave Timing Sync Ability ENabled */
+#define GC2R_DVAEN	BIT(2)		/* Dual-View Ability ENabled */
+#define GC2R_DPAEN	BIT(3)		/* Dual-Port Ability ENabled */
+#define GC2R_BW		GENMASK(6, 4)	/* Bus Width (log2 of nb of bytes) */
+#define GC2R_EDCEN	BIT(7)		/* External Display Control ENabled */
+
+#define SRCR_IMR	BIT(0)		/* IMmediate Reload */
+#define SRCR_VBR	BIT(1)		/* Vertical Blanking Reload */
+
+#define BCCR_BCBLACK	0x00		/* Background Color BLACK */
+#define BCCR_BCBLUE	GENMASK(7, 0)	/* Background Color BLUE */
+#define BCCR_BCGREEN	GENMASK(15, 8)	/* Background Color GREEN */
+#define BCCR_BCRED	GENMASK(23, 16)	/* Background Color RED */
+#define BCCR_BCWHITE	GENMASK(23, 0)	/* Background Color WHITE */
+
+#define IER_LIE		BIT(0)		/* Line Interrupt Enable */
+#define IER_FUIE	BIT(1)		/* Fifo Underrun Interrupt Enable */
+#define IER_TERRIE	BIT(2)		/* Transfer ERRor Interrupt Enable */
+#define IER_RRIE	BIT(3)		/* Register Reload Interrupt enable */
+
+#define ISR_LIF		BIT(0)		/* Line Interrupt Flag */
+#define ISR_FUIF	BIT(1)		/* Fifo Underrun Interrupt Flag */
+#define ISR_TERRIF	BIT(2)		/* Transfer ERRor Interrupt Flag */
+#define ISR_RRIF	BIT(3)		/* Register Reload Interrupt Flag */
+
+#define LXCR_LEN	BIT(0)		/* Layer ENable */
+#define LXCR_COLKEN	BIT(1)		/* Color Keying Enable */
+#define LXCR_CLUTEN	BIT(4)		/* Color Look-Up Table ENable */
+
+#define LXWHPCR_WHSTPOS	GENMASK(11, 0)	/* Window Horizontal StarT POSition */
+#define LXWHPCR_WHSPPOS	GENMASK(27, 16)	/* Window Horizontal StoP POSition */
+
+#define LXWVPCR_WVSTPOS	GENMASK(10, 0)	/* Window Vertical StarT POSition */
+#define LXWVPCR_WVSPPOS	GENMASK(26, 16)	/* Window Vertical StoP POSition */
+
+#define LXPFCR_PF	GENMASK(2, 0)	/* Pixel Format */
+
+#define LXCACR_CONSTA	GENMASK(7, 0)	/* CONSTant Alpha */
+
+#define LXBFCR_BF2	GENMASK(2, 0)	/* Blending Factor 2 */
+#define LXBFCR_BF1	GENMASK(10, 8)	/* Blending Factor 1 */
+
+#define LXCFBLR_CFBLL	GENMASK(12, 0)	/* Color Frame Buffer Line Length */
+#define LXCFBLR_CFBP	GENMASK(28, 16)	/* Color Frame Buffer Pitch in bytes */
+
+#define LXCFBLNR_CFBLN	GENMASK(10, 0)	 /* Color Frame Buffer Line Number */
+
+#define HSPOL_AL   0		/* Horizontal Sync POLarity Active Low */
+#define VSPOL_AL   0		/* Vertical Sync POLarity Active Low */
+#define DEPOL_AL   0		/* Data Enable POLarity Active Low */
+#define PCPOL_IPC  0		/* Input Pixel Clock */
+#define HSPOL_AH   GCR_HSPOL	/* Horizontal Sync POLarity Active High */
+#define VSPOL_AH   GCR_VSPOL	/* Vertical Sync POLarity Active High */
+#define DEPOL_AH   GCR_DEPOL	/* Data Enable POLarity Active High */
+#define PCPOL_IIPC GCR_PCPOL	/* Inverted Input Pixel Clock */
+#define CONSTA_MAX 0xFF		/* CONSTant Alpha MAX= 1.0 */
+#define BF1_PAXCA  0x600	/* Pixel Alpha x Constant Alpha */
+#define BF1_CA     0x400	/* Constant Alpha */
+#define BF2_1PAXCA 0x007	/* 1 - (Pixel Alpha x Constant Alpha) */
+#define BF2_1CA	   0x005	/* 1 - Constant Alpha */
+
+enum ltdc_pix_fmt {
+	PF_NONE,
+	/* RGB formats */
+	PF_ARGB8888,    /* ARGB [32 bits] */
+	PF_RGBA8888,    /* RGBA [32 bits] */
+	PF_RGB888,      /* RGB [24 bits] */
+	PF_RGB565,      /* RGB [16 bits] */
+	PF_ARGB1555,    /* ARGB A:1 bit RGB:15 bits [16 bits] */
+	PF_ARGB4444,    /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
+	/* Indexed formats */
+	PF_L8,          /* Indexed 8 bits [8 bits] */
+	PF_AL44,        /* Alpha:4 bits + indexed 4 bits [8 bits] */
+	PF_AL88         /* Alpha:8 bits + indexed 8 bits [16 bits] */
+};
+
+#define NB_PF           8       /* Max nb of HW pixel format */
+
+/* The index gives the encoding of the pixel format for an HW version */
+static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = {
+	PF_ARGB8888,	/* 0x00 */
+	PF_RGB888,	/* 0x01 */
+	PF_RGB565,	/* 0x02 */
+	PF_ARGB1555,	/* 0x03 */
+	PF_ARGB4444,	/* 0x04 */
+	PF_L8,		/* 0x05 */
+	PF_AL44,	/* 0x06 */
+	PF_AL88		/* 0x07 */
+};
+
+static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
+	PF_ARGB8888,	/* 0x00 */
+	PF_RGB888,	/* 0x01 */
+	PF_RGB565,	/* 0x02 */
+	PF_RGBA8888,	/* 0x03 */
+	PF_AL44,	/* 0x04 */
+	PF_L8,		/* 0x05 */
+	PF_ARGB1555,	/* 0x06 */
+	PF_ARGB4444	/* 0x07 */
+};
+
+struct ltdc_caps {
+	u32 hw_version;		/* hardware version */
+	u32 nb_layers;		/* number of supported layers */
+	u32 reg_ofs;		/* register offset for applicable regs */
+	u32 bus_width;		/* bus width (32 or 64 bits) */
+	const enum ltdc_pix_fmt *pix_fmt_hw; /* supported pixel formats */
+};
+
+struct ltdc {
+	struct device *dev;
+	struct drm_device *ddev;
+	struct regmap *map;
+	struct clk *pixel_clk;	/* lcd pixel clock */
+	struct drm_panel *panel;
+	struct drm_pending_vblank_event *pending_event;
+	u32 irq_status;
+	u32 error_status;
+	struct mutex err_lock;	/* protecting error_status */
+	struct ltdc_caps caps;
+	u32 clut[256];		/* color look up table */
+};
+
+static struct regmap_config ltdc_regmap_config = {
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= 0x400,
+	.fast_io	= true,
+};
+
+static inline struct ltdc *crtc_to_ltdc(struct drm_crtc *crtc)
+{
+	return ((struct st_private *)crtc->dev->dev_private)->ltdc;
+}
+
+static inline struct ltdc *plane_to_ltdc(struct drm_plane *plane)
+{
+	return ((struct st_private *)plane->dev->dev_private)->ltdc;
+}
+
+static inline struct ltdc *encoder_to_ltdc(struct drm_encoder *encoder)
+{
+	return ((struct st_private *)encoder->dev->dev_private)->ltdc;
+}
+
+static inline struct ltdc *connector_to_ltdc(struct drm_connector *connector)
+{
+	return ((struct st_private *)connector->dev->dev_private)->ltdc;
+}
+
+static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
+{
+	enum ltdc_pix_fmt pf;
+
+	switch (drm_fmt) {
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XRGB8888:
+		pf = PF_ARGB8888;
+		break;
+	case DRM_FORMAT_RGBA8888:
+	case DRM_FORMAT_RGBX8888:
+		pf = PF_RGBA8888;
+		break;
+	case DRM_FORMAT_RGB888:
+		pf = PF_RGB888;
+		break;
+	case DRM_FORMAT_RGB565:
+		pf = PF_RGB565;
+		break;
+	case DRM_FORMAT_ARGB1555:
+	case DRM_FORMAT_XRGB1555:
+		pf = PF_ARGB1555;
+		break;
+	case DRM_FORMAT_ARGB4444:
+	case DRM_FORMAT_XRGB4444:
+		pf = PF_ARGB4444;
+		break;
+	case DRM_FORMAT_C8:
+		pf = PF_L8;
+		break;
+	default:
+		pf = PF_NONE;
+		break;
+	/* Note: There are no DRM_FORMAT for AL44 and AL88 */
+	}
+
+	return pf;
+}
+
+static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
+{
+	switch (pf) {
+	case PF_ARGB8888:
+		return DRM_FORMAT_ARGB8888;
+	case PF_RGBA8888:
+		return DRM_FORMAT_RGBA8888;
+	case PF_RGB888:
+		return DRM_FORMAT_RGB888;
+	case PF_RGB565:
+		return DRM_FORMAT_RGB565;
+	case PF_ARGB1555:
+		return DRM_FORMAT_ARGB1555;
+	case PF_ARGB4444:
+		return DRM_FORMAT_ARGB4444;
+	case PF_L8:
+		return DRM_FORMAT_C8;
+	case PF_AL44: /* No DRM support */
+	case PF_AL88: /* No DRM support */
+	case PF_NONE:
+	default:
+		return 0;
+	}
+}
+
+static struct drm_crtc *crtc_from_pipe(struct drm_device *ddev,
+				       unsigned int pipe)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &ddev->mode_config.crtc_list, head) {
+		if (pipe == drm_crtc_index(crtc))
+			return crtc;
+	}
+
+	return NULL;
+}
+
+static void ltdc_send_vblank(struct ltdc *ltdc)
+{
+	struct drm_device *ddev = ltdc->ddev;
+	struct drm_crtc *crtc = crtc_from_pipe(ddev, 0);
+	unsigned long flags;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	drm_crtc_handle_vblank(crtc);
+
+	spin_lock_irqsave(&ddev->event_lock, flags);
+	if (ltdc->pending_event) {
+		drm_crtc_send_vblank_event(crtc, ltdc->pending_event);
+		drm_crtc_vblank_put(crtc);
+		ltdc->pending_event = NULL;
+	}
+
+	spin_unlock_irqrestore(&ddev->event_lock, flags);
+}
+
+static irqreturn_t ltdc_irq_thread(int irq, void *arg)
+{
+	struct ltdc *ltdc = arg;
+
+	/* Line IRQ : trigger the vblank event */
+	if (ltdc->irq_status & ISR_LIF)
+		ltdc_send_vblank(ltdc);
+
+	/* Save FIFO Underrun & Transfer Error status */
+	mutex_lock(&ltdc->err_lock);
+	if (ltdc->irq_status & ISR_FUIF)
+		ltdc->error_status |= ISR_FUIF;
+	if (ltdc->irq_status & ISR_TERRIF)
+		ltdc->error_status |= ISR_TERRIF;
+	mutex_unlock(&ltdc->err_lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ltdc_irq(int irq, void *arg)
+{
+	struct ltdc *ltdc = arg;
+
+	/* Read & Clear the interrupt status */
+	regmap_read(ltdc->map, LTDC_ISR, &ltdc->irq_status);
+	regmap_write(ltdc->map, LTDC_ICR, ltdc->irq_status);
+
+	return IRQ_WAKE_THREAD;
+}
+
+/*
+ * DRM_CRTC
+ */
+
+static void ltdc_crtc_load_lut(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	unsigned int i, lay;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	for (lay = 0; lay < ltdc->caps.nb_layers; lay++)
+		for (i = 0; i < 256; i++)
+			regmap_write(ltdc->map, LTDC_L1CLUTWR + lay * LAY_OFS,
+				     ltdc->clut[i]);
+}
+
+static void ltdc_crtc_enable(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+
+	DRM_DEBUG_DRIVER("\n");
+
+	if (clk_enable(ltdc->pixel_clk))
+		DRM_ERROR("failed to enable pixel clock\n");
+
+	/* Sets the background color value */
+	regmap_write(ltdc->map, LTDC_BCCR, BCCR_BCBLACK);
+
+	/* Enable IRQ */
+	regmap_update_bits(ltdc->map, LTDC_IER,
+			   IER_RRIE | IER_FUIE | IER_TERRIE,
+			   IER_RRIE | IER_FUIE | IER_TERRIE);
+
+	/* Immediately commit the planes */
+	regmap_update_bits(ltdc->map, LTDC_SRCR, SRCR_IMR, SRCR_IMR);
+
+	/* Enable LTDC */
+	regmap_update_bits(ltdc->map, LTDC_GCR, GCR_LTDCEN, GCR_LTDCEN);
+
+	drm_crtc_vblank_on(crtc);
+}
+
+static void ltdc_crtc_disable(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	unsigned int i;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	if (!crtc->enabled) {
+		DRM_DEBUG_DRIVER("already disabled\n");
+		return;
+	}
+
+	drm_crtc_vblank_off(crtc);
+
+	/* disable LTDC */
+	regmap_update_bits(ltdc->map, LTDC_GCR, GCR_LTDCEN, 0);
+
+	/* disable IRQ */
+	regmap_update_bits(ltdc->map, LTDC_IER,
+			   IER_RRIE | IER_FUIE | IER_TERRIE, 0);
+
+	/* disable layers */
+	for (i = 0; i < ltdc->caps.nb_layers; i++)
+		regmap_update_bits(ltdc->map, LTDC_L1CR + i * LAY_OFS,
+				   LXCR_LEN, 0);
+
+	/* immediately commit disable of layers before switching off LTDC */
+	regmap_write(ltdc->map, LTDC_SRCR, SRCR_IMR);
+
+	clk_disable(ltdc->pixel_clk);
+
+	if (crtc->state->event && !crtc->state->active) {
+		spin_lock_irq(&crtc->dev->event_lock);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+
+		crtc->state->event = NULL;
+	}
+}
+
+static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
+				 const struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted_mode)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+	/* accept the provided drm_display_mode, do not fix it up */
+	return true;
+}
+
+static u32 ltdc_get_paddr(struct drm_framebuffer *fb, int x, int y)
+{
+	struct drm_gem_cma_object *cma_obj;
+	unsigned int pixsize;
+	u32 paddr;
+
+	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	if (IS_ERR(cma_obj)) {
+		DRM_ERROR("Can't get CMA GEM object for fb\n");
+		return 0;
+	}
+
+	pixsize = drm_format_plane_cpp(fb->format->format, 0);
+	paddr = (u32)cma_obj->paddr + fb->offsets[0];
+	paddr += (x * pixsize) + (y * fb->pitches[0]);
+
+	return paddr;
+}
+
+static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+	struct videomode vm;
+	int rate = mode->clock * 1000;
+	u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
+	u32 total_width, total_height;
+	u32 val;
+
+	drm_display_mode_to_videomode(mode, &vm);
+
+	dev_dbg(ltdc->dev, "CRTC:%d mode:%s\n", crtc->base.id, mode->name);
+	dev_dbg(ltdc->dev, "Video mode: %dx%d", vm.hactive, vm.vactive);
+	dev_dbg(ltdc->dev, " hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
+		vm.hfront_porch, vm.hback_porch, vm.hsync_len,
+		vm.vfront_porch, vm.vback_porch, vm.vsync_len);
+
+	/* Convert video timings to ltdc timings */
+	hsync = vm.hsync_len - 1;
+	vsync = vm.vsync_len - 1;
+	accum_hbp = hsync + vm.hback_porch;
+	accum_vbp = vsync + vm.vback_porch;
+	accum_act_w = accum_hbp + vm.hactive;
+	accum_act_h = accum_vbp + vm.vactive;
+	total_width = accum_act_w + vm.hfront_porch;
+	total_height = accum_act_h + vm.vfront_porch;
+
+	if (clk_set_rate(ltdc->pixel_clk, rate) < 0) {
+		DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
+		return;
+	}
+
+	/*
+	 * Configures the HS, VS, DE and PC polarities.
+	 * It would be better to get polarities from panel, but since
+	 * these values are quite standard, use hard coded values here
+	 */
+	val = HSPOL_AL | VSPOL_AL | DEPOL_AL | PCPOL_IPC;
+	regmap_update_bits(ltdc->map, LTDC_GCR, GCR_HSPOL | GCR_VSPOL |
+			   GCR_DEPOL | GCR_PCPOL, val);
+
+	/* Set Synchronization size */
+	val = (hsync << 16) | vsync;
+	regmap_update_bits(ltdc->map, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
+
+	/* Set Accumulated Back porch */
+	val = (accum_hbp << 16) | accum_vbp;
+	regmap_update_bits(ltdc->map, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
+
+	/* Set Accumulated Active Width */
+	val = (accum_act_w << 16) | accum_act_h;
+	regmap_update_bits(ltdc->map, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
+
+	/* Set total width & height */
+	val = (total_width << 16) | total_height;
+	regmap_update_bits(ltdc->map, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW,
+			   val);
+}
+
+static void ltdc_crtc_atomic_begin(struct drm_crtc *crtc,
+				   struct drm_crtc_state *old_crtc_state)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	unsigned long flags;
+
+	DRM_DEBUG_ATOMIC("\n");
+
+	if (crtc->state->event) {
+		if (drm_crtc_vblank_get(crtc) != 0)
+			DRM_DEBUG_ATOMIC("Failed do get vblank");
+
+		spin_lock_irqsave(&crtc->dev->event_lock, flags);
+		ltdc->pending_event = crtc->state->event;
+		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+
+		crtc->state->event = NULL;
+	}
+}
+
+static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
+				   struct drm_crtc_state *old_crtc_state)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	struct drm_pending_vblank_event *event = crtc->state->event;
+
+	DRM_DEBUG_ATOMIC("\n");
+
+	/* Commit shadow registers = update planes at next vblank */
+	regmap_update_bits(ltdc->map, LTDC_SRCR, SRCR_VBR, SRCR_VBR);
+
+	if (event) {
+		crtc->state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		if (drm_crtc_vblank_get(crtc) == 0)
+			drm_crtc_arm_vblank_event(crtc, event);
+		else
+			drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+}
+
+static struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
+	.load_lut = ltdc_crtc_load_lut,
+	.enable = ltdc_crtc_enable,
+	.disable = ltdc_crtc_disable,
+	.mode_fixup = ltdc_crtc_mode_fixup,
+	.mode_set_nofb = ltdc_crtc_mode_set_nofb,
+	.atomic_begin = ltdc_crtc_atomic_begin,
+	.atomic_flush = ltdc_crtc_atomic_flush,
+};
+
+int ltdc_crtc_enable_vblank(struct drm_device *ddev, unsigned int pipe)
+{
+	struct st_private *priv = ddev->dev_private;
+	struct ltdc *ltdc = priv->ltdc;
+
+	DRM_DEBUG_DRIVER("\n");
+	regmap_update_bits(ltdc->map, LTDC_IER, IER_LIE, IER_LIE);
+
+	return 0;
+}
+
+void ltdc_crtc_disable_vblank(struct drm_device *ddev, unsigned int pipe)
+{
+	struct drm_crtc *crtc = crtc_from_pipe(ddev, pipe);
+	struct st_private *priv = ddev->dev_private;
+	struct ltdc *ltdc = priv->ltdc;
+
+	DRM_DEBUG_DRIVER("\n");
+	regmap_update_bits(ltdc->map, LTDC_IER, IER_LIE, 0);
+
+	if (ltdc->pending_event) {
+		drm_crtc_vblank_put(crtc);
+		ltdc->pending_event = NULL;
+	}
+}
+
+static struct drm_crtc_funcs ltdc_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,
+};
+
+/*
+ * DRM_PLANE
+ */
+
+static int ltdc_plane_atomic_check(struct drm_plane *plane,
+				   struct drm_plane_state *state)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+	struct drm_framebuffer *fb = state->fb;
+	u32 src_x, src_y, src_w, src_h;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (!fb)
+		return 0;
+
+	/* convert src_ from 16:16 format */
+	src_x = state->src_x >> 16;
+	src_y = state->src_y >> 16;
+	src_w = state->src_w >> 16;
+	src_h = state->src_h >> 16;
+
+	/* Reject scaling */
+	if ((src_w != state->crtc_w) || (src_h != state->crtc_h)) {
+		DRM_ERROR("Scaling is not supported");
+		return -EINVAL;
+	}
+
+	if (!ltdc_get_paddr(fb, src_x, src_y)) {
+		DRM_ERROR("Cannot get fb address\n");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static void ltdc_plane_atomic_update(struct drm_plane *plane,
+				     struct drm_plane_state *oldstate)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+	struct drm_plane_state *state = plane->state;
+	struct drm_framebuffer *fb = state->fb;
+	u32 lofs = plane->index * LAY_OFS;
+	u32 x0 = state->crtc_x;
+	u32 x1 = state->crtc_x + state->crtc_w - 1;
+	u32 y0 = state->crtc_y;
+	u32 y1 = state->crtc_y + state->crtc_h - 1;
+	u32 src_x, src_y, src_w, src_h;
+	u32 val, pitch_in_bytes, line_length, paddr, ahbp, avbp, bpcr;
+	enum ltdc_pix_fmt pf;
+
+	if (!state->crtc || !fb) {
+		DRM_DEBUG_DRIVER("fb or crtc NULL");
+		return;
+	}
+
+	/* convert src_ from 16:16 format */
+	src_x = state->src_x >> 16;
+	src_y = state->src_y >> 16;
+	src_w = state->src_w >> 16;
+	src_h = state->src_h >> 16;
+
+	DRM_DEBUG_DRIVER(
+		"plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n",
+		plane->base.id, fb->base.id,
+		src_w, src_h, src_x, src_y,
+		state->crtc_w, state->crtc_h, state->crtc_x, state->crtc_y);
+
+	regmap_read(ltdc->map, LTDC_BPCR, &bpcr);
+	ahbp = (bpcr & BPCR_AHBP) >> 16;
+	avbp = bpcr & BPCR_AVBP;
+
+	/* Configures the horizontal start and stop position */
+	val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
+	regmap_update_bits(ltdc->map, LTDC_L1WHPCR + lofs,
+			   LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
+
+	/* Configures the vertical start and stop position */
+	val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
+	regmap_update_bits(ltdc->map, LTDC_L1WVPCR + lofs,
+			   LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
+
+	/* Specifies the pixel format */
+	pf = to_ltdc_pixelformat(fb->format->format);
+	for (val = 0; val < NB_PF; val++)
+		if (ltdc->caps.pix_fmt_hw[val] == pf)
+			break;
+
+	if (val == NB_PF) {
+		DRM_ERROR("Pixel format %.4s not supported\n",
+			  (char *)&fb->format->format);
+		val = 0; /* set by default ARGB 32 bits */
+	}
+	regmap_update_bits(ltdc->map, LTDC_L1PFCR + lofs,
+			   LXPFCR_PF, val);
+
+	/* Configures the color frame buffer pitch in bytes & line length */
+	pitch_in_bytes = fb->pitches[0];
+	line_length = drm_format_plane_cpp(fb->format->format, 0) *
+		      (x1 - x0 + 1) + (ltdc->caps.bus_width >> 3) - 1;
+	val = ((pitch_in_bytes << 16) | line_length);
+	regmap_update_bits(ltdc->map, LTDC_L1CFBLR + lofs,
+			   LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
+
+	/* Specifies the constant alpha value */
+	val = CONSTA_MAX;
+	regmap_update_bits(ltdc->map, LTDC_L1CACR + lofs,
+			   LXCACR_CONSTA, val);
+
+	/* Specifies the blending factors */
+	val = BF1_PAXCA | BF2_1PAXCA;
+	regmap_update_bits(ltdc->map, LTDC_L1BFCR + lofs,
+			   LXBFCR_BF2 | LXBFCR_BF1, val);
+
+	/* Configures the frame buffer line number */
+	val = y1 - y0 + 1;
+	regmap_update_bits(ltdc->map, LTDC_L1CFBLNR + lofs,
+			   LXCFBLNR_CFBLN, val);
+
+	/* Sets the FB address */
+	paddr = ltdc_get_paddr(fb, src_x, src_y);
+	dev_dbg(ltdc->dev, "fb: phys 0x%08x", paddr);
+	regmap_write(ltdc->map, LTDC_L1CFBAR + lofs, paddr);
+
+	/* Enable layer and CLUT if needed */
+	val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
+	val |= LXCR_LEN;
+	regmap_update_bits(ltdc->map, LTDC_L1CR + lofs,
+			   LXCR_LEN | LXCR_CLUTEN, val);
+
+	mutex_lock(&ltdc->err_lock);
+	if (ltdc->error_status & ISR_FUIF) {
+		dev_dbg(ltdc->dev, "Fifo underrun\n");
+		ltdc->error_status &= ~ISR_FUIF;
+	}
+	if (ltdc->error_status & ISR_TERRIF) {
+		dev_dbg(ltdc->dev, "Transfer error\n");
+		ltdc->error_status &= ~ISR_TERRIF;
+	}
+	mutex_unlock(&ltdc->err_lock);
+}
+
+static void ltdc_plane_atomic_disable(struct drm_plane *plane,
+				      struct drm_plane_state *oldstate)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+	u32 lofs = plane->index * LAY_OFS;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (!oldstate->crtc) {
+		DRM_DEBUG_DRIVER("drm plane:%d not enabled\n", plane->base.id);
+		return;
+	}
+
+	/* disable layer */
+	regmap_update_bits(ltdc->map, LTDC_L1CR + lofs, LXCR_LEN, 0);
+
+	DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
+			 oldstate->crtc->base.id, plane->base.id);
+}
+
+static void ltdc_plane_destroy(struct drm_plane *plane)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	drm_plane_helper_disable(plane);
+	drm_plane_cleanup(plane);
+}
+
+static struct drm_plane_funcs ltdc_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = ltdc_plane_destroy,
+	.set_property = drm_atomic_helper_plane_set_property,
+	.reset = drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
+	.atomic_check = ltdc_plane_atomic_check,
+	.atomic_update = ltdc_plane_atomic_update,
+	.atomic_disable = ltdc_plane_atomic_disable,
+};
+
+static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
+					   enum drm_plane_type type)
+{
+	struct st_private *priv = ddev->dev_private;
+	unsigned long possible_crtcs = CRTC_MASK;
+	struct ltdc *ltdc = priv->ltdc;
+	struct drm_plane *plane;
+	unsigned int i, nb_fmt = 0;
+	u32 formats[NB_PF];
+	u32 drm_fmt;
+	int err;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	/* Get supported pixel formats */
+	for (i = 0; i < NB_PF; i++) {
+		drm_fmt = to_drm_pixelformat(ltdc->caps.pix_fmt_hw[i]);
+		if (!drm_fmt)
+			continue;
+		formats[nb_fmt++] = drm_fmt;
+	}
+
+	plane = devm_kzalloc(ltdc->dev, sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return 0;
+
+	err = drm_universal_plane_init(ddev, plane, possible_crtcs,
+				       &ltdc_plane_funcs, formats, nb_fmt,
+				       type, NULL);
+	if (err < 0)
+		return 0;
+
+	drm_plane_helper_add(plane, &ltdc_plane_helper_funcs);
+
+	DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
+
+	return plane;
+}
+
+static void ltdc_plane_destroy_all(struct ltdc *ltdc)
+{
+	struct drm_plane *plane, *plane_temp;
+
+	list_for_each_entry_safe(plane, plane_temp,
+				 &ltdc->ddev->mode_config.plane_list, head)
+		drm_plane_cleanup(plane);
+}
+
+static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
+{
+	struct st_private *priv = ddev->dev_private;
+	struct ltdc *ltdc = priv->ltdc;
+	struct drm_plane *primary, *overlay;
+	unsigned int i;
+	int res;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY);
+	if (!primary) {
+		DRM_ERROR("Can not create primary plane\n");
+		return -EINVAL;
+	}
+
+	res = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
+					&ltdc_crtc_funcs, NULL);
+	if (res) {
+		DRM_ERROR("Can not initialize CRTC\n");
+		goto cleanup;
+	}
+
+	drm_crtc_helper_add(crtc, &ltdc_crtc_helper_funcs);
+
+	DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
+
+	/* Add planes. Note : the first layer is used by primary plane */
+	for (i = 1; i < ltdc->caps.nb_layers; i++) {
+		overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY);
+		if (!overlay) {
+			res = -ENOMEM;
+			DRM_ERROR("Can not create overlay plane %d\n", i);
+			goto cleanup;
+		}
+	}
+
+	return 0;
+
+cleanup:
+	ltdc_plane_destroy_all(ltdc);
+	return res;
+}
+
+/*
+ * DRM_ENCODER
+ */
+
+static void ltdc_rgb_encoder_enable(struct drm_encoder *encoder)
+{
+	struct ltdc *ltdc = encoder_to_ltdc(encoder);
+
+	DRM_DEBUG_DRIVER("\n");
+	drm_panel_prepare(ltdc->panel);
+	drm_panel_enable(ltdc->panel);
+}
+
+static void ltdc_rgb_encoder_disable(struct drm_encoder *encoder)
+{
+	struct ltdc *ltdc = encoder_to_ltdc(encoder);
+
+	DRM_DEBUG_DRIVER("\n");
+
+	drm_panel_disable(ltdc->panel);
+	drm_panel_unprepare(ltdc->panel);
+}
+
+static const struct drm_encoder_helper_funcs ltdc_rgb_encoder_helper_funcs = {
+	.enable = ltdc_rgb_encoder_enable,
+	.disable = ltdc_rgb_encoder_disable,
+};
+
+static const struct drm_encoder_funcs ltdc_rgb_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static struct drm_encoder *ltdc_rgb_encoder_create(struct drm_device *ddev)
+{
+	struct drm_encoder *encoder;
+
+	encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
+	if (!encoder)
+		return NULL;
+
+	encoder->possible_crtcs = CRTC_MASK;
+	encoder->possible_clones = 0; /* No cloning support */
+
+	drm_encoder_init(ddev, encoder, &ltdc_rgb_encoder_funcs,
+			 DRM_MODE_ENCODER_LVDS, NULL);
+
+	drm_encoder_helper_add(encoder, &ltdc_rgb_encoder_helper_funcs);
+
+	DRM_DEBUG_DRIVER("RGB encoder:%d created\n", encoder->base.id);
+
+	return encoder;
+}
+
+static struct drm_encoder *ltdc_rgb_encoder_find(struct drm_device *ddev)
+{
+	struct drm_encoder *encoder;
+
+	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head) {
+		if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS)
+			return encoder;
+	}
+
+	return NULL;
+}
+
+static int ltdc_create_encoders(struct ltdc *ltdc)
+{
+	struct drm_device *ddev = ltdc->ddev;
+	struct drm_encoder *encoder;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel) {
+		encoder = ltdc_rgb_encoder_create(ddev);
+		if (!encoder)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void ltdc_destroy_encoders(struct ltdc *ltdc)
+{
+	struct drm_encoder *encoder, *encoder_temp;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	list_for_each_entry_safe(encoder, encoder_temp,
+				 &ltdc->ddev->mode_config.encoder_list, head)
+		drm_encoder_cleanup(encoder);
+}
+
+/*
+ * DRM_CONNECTOR
+ */
+
+static int ltdc_rgb_connector_get_modes(struct drm_connector *connector)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+	int ret = 0;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel)
+		ret = drm_panel_get_modes(ltdc->panel);
+
+	return ret < 0 ? 0 : ret;
+}
+
+/* Set a tolerance of 10% on pixel clock */
+#define CLK_TOLERANCE_PCT 10
+
+static enum drm_mode_status
+ltdc_rgb_connector_mode_valid(struct drm_connector *connector,
+			      struct drm_display_mode *mode)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+	unsigned long rate = mode->clock * 1000;
+	long rate_min = rate - (rate * CLK_TOLERANCE_PCT) / 100;
+	long rate_max = rate;
+	long rounded_rate;
+
+	rounded_rate = clk_round_rate(ltdc->pixel_clk, rate);
+
+	DRM_DEBUG_DRIVER("Target rate = %ld => available rate = %ld\n",
+			 rate, rounded_rate);
+
+	if (rounded_rate < rate_min)
+		return MODE_CLOCK_LOW;
+
+	if (rounded_rate > rate_max)
+		return MODE_CLOCK_HIGH;
+
+	if (!rate)
+		return MODE_BAD;
+
+	return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs ltdc_rgb_connector_helper_funcs = {
+	.get_modes = ltdc_rgb_connector_get_modes,
+	.mode_valid = ltdc_rgb_connector_mode_valid,
+};
+
+static enum drm_connector_status
+ltdc_rgb_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+	int ret = 0;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel) {
+		ret = drm_panel_attach(ltdc->panel, connector);
+
+		if (!ret || ret == -EBUSY) {
+			DRM_DEBUG_DRIVER("connector status connected");
+			return connector_status_connected;
+		}
+	}
+
+	DRM_DEBUG_DRIVER("connector status disconnected");
+	return connector_status_disconnected;
+}
+
+static void ltdc_rgb_connector_destroy(struct drm_connector *connector)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel)
+		drm_panel_detach(ltdc->panel);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs ltdc_rgb_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = ltdc_rgb_connector_detect,
+	.destroy = ltdc_rgb_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+struct drm_connector *ltdc_rgb_connector_create(struct drm_device *ddev)
+{
+	struct drm_connector *connector;
+	int err;
+
+	connector = devm_kzalloc(ddev->dev, sizeof(*connector), GFP_KERNEL);
+	if (!connector) {
+		DRM_ERROR("Failed to allocate connector\n");
+		return NULL;
+	}
+
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+	err = drm_connector_init(ddev, connector, &ltdc_rgb_connector_funcs,
+				 DRM_MODE_CONNECTOR_LVDS);
+	if (err) {
+		DRM_ERROR("Failed to initialize connector\n");
+		return NULL;
+	}
+
+	drm_connector_helper_add(connector, &ltdc_rgb_connector_helper_funcs);
+
+	DRM_DEBUG_DRIVER("RGB connector:%d created\n", connector->base.id);
+
+	return connector;
+}
+
+/*
+ * PROBE & BINDING
+ */
+
+static int ltdc_bind(struct device *dev, struct device *master, void *data)
+{
+	struct ltdc *ltdc = dev_get_drvdata(dev);
+	struct drm_device *ddev = data;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector = NULL;
+	struct st_private *priv = ddev->dev_private;
+	struct drm_crtc *crtc;
+	int err;
+
+	dev_dbg(ltdc->dev, "%s drm_device *dev 0x%08x\n",
+		__func__, (u32)(ddev));
+
+	priv->ltdc = ltdc;
+	ltdc->ddev = ddev;
+
+	if (ltdc_create_encoders(ltdc)) {
+		DRM_ERROR("Failed to create encoders\n");
+		return -EINVAL;
+	}
+
+	if (ltdc->panel) {
+		encoder = ltdc_rgb_encoder_find(ddev);
+		if (!encoder) {
+			DRM_ERROR("Failed to find RGB encoder\n");
+			err = -EINVAL;
+			goto err_encoder;
+		}
+
+		connector = ltdc_rgb_connector_create(ddev);
+		if (!connector) {
+			DRM_ERROR("Failed to create RGB connector\n");
+			err = -EINVAL;
+			goto err_encoder;
+		}
+
+		err = drm_mode_connector_attach_encoder(connector, encoder);
+		if (err) {
+			DRM_ERROR("Failed to attach connector to encoder\n");
+			goto err_connector;
+		}
+	}
+
+	crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
+	if (!crtc) {
+		DRM_ERROR("Failed to allocate crtc\n");
+		err = -ENOMEM;
+		goto err_connector;
+	}
+
+	err = ltdc_crtc_init(ddev, crtc);
+	if (err) {
+		DRM_ERROR("Failed to init crtc\n");
+		goto err_connector;
+	}
+
+	err = drm_vblank_init(ddev, NB_CRTC);
+	if (err) {
+		DRM_ERROR("Failed calling drm_vblank_init()\n");
+		goto err_vblank;
+	}
+
+	/* Allow usage of vblank without having to call drm_irq_install */
+	ddev->irq_enabled = 1;
+
+	return 0;
+
+err_vblank:
+	ltdc_plane_destroy_all(ltdc);
+err_connector:
+	ltdc_rgb_connector_destroy(connector);
+err_encoder:
+	ltdc_destroy_encoders(ltdc);
+
+	return err;
+}
+
+static void ltdc_unbind(struct device *dev, struct device *master, void *data)
+{
+	struct ltdc *ltdc = dev_get_drvdata(dev);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	drm_vblank_cleanup(ltdc->ddev);
+	ltdc_plane_destroy_all(ltdc);
+	ltdc_destroy_encoders(ltdc);
+}
+
+static const struct component_ops ltdc_ops = {
+	.bind = ltdc_bind,
+	.unbind = ltdc_unbind,
+};
+
+static int ltdc_get_caps(struct ltdc *ltdc)
+{
+	u32 bus_width_log2, lcr, gc2r;
+
+	/* at least 1 layer must be managed */
+	regmap_read(ltdc->map, LTDC_LCR, &lcr);
+
+	ltdc->caps.nb_layers = max_t(int, lcr, 1);
+
+	/* set data bus width */
+	regmap_read(ltdc->map, LTDC_GC2R, &gc2r);
+	bus_width_log2 = (gc2r & GC2R_BW) >> 4;
+	ltdc->caps.bus_width = 8 << bus_width_log2;
+	regmap_read(ltdc->map, LTDC_IDR, &ltdc->caps.hw_version);
+
+	switch (ltdc->caps.hw_version) {
+	case HWVER_10200:
+	case HWVER_10300:
+		ltdc->caps.reg_ofs = REG_OFS_NONE;
+		ltdc->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
+		break;
+	case HWVER_20101:
+		ltdc->caps.reg_ofs = REG_OFS_4;
+		ltdc->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int ltdc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct reset_control *rstc;
+	struct resource res;
+	struct ltdc *ltdc;
+	struct drm_panel *panel = NULL;
+	struct device_node *entity, *remote_pt = NULL;
+	void __iomem *regs;
+	int irq, ret, i;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	/*
+	 * Parse ltdc node to get remote port and find RGB panel / HDMI slave
+	 * If a dsi or a bridge (hdmi, lvds...) is connected to ltdc,
+	 * a remote port & RGB panel will not be found.
+	 */
+	for_each_endpoint_of_node(np, entity) {
+		if (!of_device_is_available(entity))
+			continue;
+
+		remote_pt = of_graph_get_remote_port_parent(entity);
+		if (remote_pt) {
+			if (!panel) {
+				panel = of_drm_find_panel(remote_pt);
+				of_node_put(remote_pt);
+				if (panel) {
+					dev_dbg(dev, "remote panel %s\n",
+						remote_pt->full_name);
+				} else {
+					dev_dbg(dev, "deferred (panel missing)\n");
+					of_node_put(entity);
+					return -EPROBE_DEFER;
+				}
+			}
+		}
+	}
+
+	ltdc = devm_kzalloc(dev, sizeof(*ltdc), GFP_KERNEL);
+	if (!ltdc) {
+		DRM_ERROR("Cannot allocate memory for ltdc\n");
+		return -ENOMEM;
+	}
+
+	ltdc->dev = dev;
+	ltdc->panel = panel;
+
+	rstc = of_reset_control_get(np, NULL);
+
+	mutex_init(&ltdc->err_lock);
+
+	ltdc->pixel_clk = devm_clk_get(dev, "clk-lcd");
+	if (IS_ERR(ltdc->pixel_clk)) {
+		DRM_ERROR("Unable to get lcd clock\n");
+		return -ENODEV;
+	}
+
+	if (of_address_to_resource(np, 0, &res)) {
+		DRM_ERROR("Unable to get resource\n");
+		return -ENODEV;
+	}
+
+	regs = devm_ioremap_resource(dev, &res);
+	if (IS_ERR(regs)) {
+		DRM_ERROR("Unable to get ltdc registers\n");
+		return PTR_ERR(regs);
+	}
+
+	ltdc->map = devm_regmap_init_mmio_clk(dev, "clk-lcd", regs,
+					      &ltdc_regmap_config);
+	if (IS_ERR(ltdc->map)) {
+		dev_err(dev, "Couldn't create ltdc register mapping\n");
+		return PTR_ERR(ltdc->map);
+	}
+
+	for (i = 0; i < MAX_IRQ; i++) {
+		irq = platform_get_irq(pdev, i);
+		if (irq < 0)
+			continue;
+
+		ret = devm_request_threaded_irq(dev, irq, ltdc_irq,
+						ltdc_irq_thread, IRQF_ONESHOT,
+						dev_name(dev), ltdc);
+		if (ret) {
+			DRM_ERROR("Failed to register LTDC interrupt\n");
+			return ret;
+		}
+	}
+
+	if (!IS_ERR(rstc))
+		reset_control_deassert(rstc);
+
+	/* Disable interrupts */
+	regmap_update_bits(ltdc->map, LTDC_IER,
+			   IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE, 0);
+
+	ret = ltdc_get_caps(ltdc);
+	if (ret) {
+		DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
+			  ltdc->caps.hw_version);
+		return ret;
+	}
+
+	DRM_INFO("ltdc hw version 0x%08x - ready\n", ltdc->caps.hw_version);
+
+	platform_set_drvdata(pdev, ltdc);
+
+	ret = component_add(&pdev->dev, &ltdc_ops);
+	if (ret) {
+		DRM_ERROR("Cannot add component\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ltdc_remove(struct platform_device *pdev)
+{
+	DRM_DEBUG_DRIVER("\n");
+	component_del(&pdev->dev, &ltdc_ops);
+
+	return 0;
+}
+
+static const struct of_device_id ltdc_of_match[] = {
+	{ .compatible = "st,ltdc" },
+	{ /* end node */ }
+};
+MODULE_DEVICE_TABLE(of, ltdc_of_match);
+
+struct platform_driver ltdc_driver = {
+	.driver = {
+		.name = "st-ltdc",
+		.of_match_table = ltdc_of_match,
+	},
+	.probe = ltdc_probe,
+	.remove = ltdc_remove,
+};
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/st/ltdc.h b/drivers/gpu/drm/st/ltdc.h
new file mode 100644
index 0000000..f99142c
--- /dev/null
+++ b/drivers/gpu/drm/st/ltdc.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _LTDC_H_
+#define _LTDC_H_
+
+#include <drm/drmP.h>
+
+int ltdc_crtc_enable_vblank(struct drm_device *dev, unsigned int pipe);
+void ltdc_crtc_disable_vblank(struct drm_device *dev, unsigned int pipe);
+
+#endif
-- 
1.9.1

[PATCH v1 2/7] drm/st: Add STM32 LTDC driver

[Yannick Fertre]

This patch adds support for the STM32 LCD-TFT display controller.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 drivers/gpu/drm/Kconfig     |    2 +
 drivers/gpu/drm/Makefile    |    1 +
 drivers/gpu/drm/st/Kconfig  |   14 +
 drivers/gpu/drm/st/Makefile |    7 +
 drivers/gpu/drm/st/drv.c    |  279 +++++++++
 drivers/gpu/drm/st/drv.h    |   25 +
 drivers/gpu/drm/st/ltdc.c   | 1438 +++++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/st/ltdc.h   |   20 +
 8 files changed, 1786 insertions(+)
 create mode 100644 drivers/gpu/drm/st/Kconfig
 create mode 100644 drivers/gpu/drm/st/Makefile
 create mode 100644 drivers/gpu/drm/st/drv.c
 create mode 100644 drivers/gpu/drm/st/drv.h
 create mode 100644 drivers/gpu/drm/st/ltdc.c
 create mode 100644 drivers/gpu/drm/st/ltdc.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 6f3f9e6..d8e6f92 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -237,6 +237,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig"
 
 source "drivers/gpu/drm/tegra/Kconfig"
 
+source "drivers/gpu/drm/st/Kconfig"
+
 source "drivers/gpu/drm/panel/Kconfig"
 
 source "drivers/gpu/drm/bridge/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 92de399..7434c09 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
 obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
 obj-$(CONFIG_DRM_MSM) += msm/
 obj-$(CONFIG_DRM_TEGRA) += tegra/
+obj-$(CONFIG_DRM_ST) += st/
 obj-$(CONFIG_DRM_STI) += sti/
 obj-$(CONFIG_DRM_IMX) += imx/
 obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
diff --git a/drivers/gpu/drm/st/Kconfig b/drivers/gpu/drm/st/Kconfig
new file mode 100644
index 0000000..fa0ac0c
--- /dev/null
+++ b/drivers/gpu/drm/st/Kconfig
@@ -0,0 +1,14 @@
+config DRM_ST
+	tristate "DRM Support for STMicroelectronics SoC Series"
+	depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)
+	select DRM_KMS_HELPER
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_PANEL
+	select VIDEOMODE_HELPERS
+	select FB_PROVIDE_GET_FB_UNMAPPED_AREA
+	help
+	  Choose this option if you have an ST STMicroelectronics SoC.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called st-drm.
diff --git a/drivers/gpu/drm/st/Makefile b/drivers/gpu/drm/st/Makefile
new file mode 100644
index 0000000..b2a9025
--- /dev/null
+++ b/drivers/gpu/drm/st/Makefile
@@ -0,0 +1,7 @@
+ccflags-y := -Iinclude/drm
+
+st-drm-y := \
+	drv.o \
+	ltdc.o
+
+obj-$(CONFIG_DRM_ST) += st-drm.o
diff --git a/drivers/gpu/drm/st/drv.c b/drivers/gpu/drm/st/drv.c
new file mode 100644
index 0000000..a275019
--- /dev/null
+++ b/drivers/gpu/drm/st/drv.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/component.h>
+#include <linux/of_platform.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "drv.h"
+#include "ltdc.h"
+
+#define DRIVER_NAME	"st"
+#define DRIVER_DESC	"STMicroelectronics SoC DRM"
+#define DRIVER_DATE	"20170110"
+#define DRIVER_MAJOR	1
+#define DRIVER_MINOR	0
+
+#define ST_MAX_FB_WIDTH		2048
+#define ST_MAX_FB_HEIGHT	2048 /* same as width to handle orientation */
+
+static void st_output_poll_changed(struct drm_device *ddev)
+{
+	struct st_private *priv = ddev->dev_private;
+
+	drm_fbdev_cma_hotplug_event(priv->fbdev);
+}
+
+static const struct drm_mode_config_funcs st_mode_config_funcs = {
+	.fb_create = drm_fb_cma_create,
+	.output_poll_changed = st_output_poll_changed,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static void st_mode_config_init(struct drm_device *ddev)
+{
+	ddev->mode_config.min_width = 0;
+	ddev->mode_config.min_height = 0;
+
+	/*
+	 * set max width and height as default value.
+	 * this value would be used to check framebuffer size limitation
+	 * at drm_mode_addfb().
+	 */
+	ddev->mode_config.max_width = ST_MAX_FB_WIDTH;
+	ddev->mode_config.max_height = ST_MAX_FB_HEIGHT;
+	ddev->mode_config.funcs = &st_mode_config_funcs;
+}
+
+static const struct file_operations st_driver_fops = {
+	.owner = THIS_MODULE,
+	.open = drm_open,
+	.get_unmapped_area = drm_gem_cma_get_unmapped_area,
+	.mmap = drm_gem_cma_mmap,
+	.poll = drm_poll,
+	.read = drm_read,
+	.unlocked_ioctl = drm_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = drm_compat_ioctl,
+#endif
+	.release = drm_release,
+};
+
+static struct drm_driver st_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
+			   DRIVER_ATOMIC,
+	.gem_free_object_unlocked = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+	.dumb_create = drm_gem_cma_dumb_create,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.dumb_destroy = drm_gem_dumb_destroy,
+	.fops = &st_driver_fops,
+
+	.get_vblank_counter = drm_vblank_no_hw_counter,
+	.enable_vblank = ltdc_crtc_enable_vblank,
+	.disable_vblank = ltdc_crtc_disable_vblank,
+
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap = drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap = drm_gem_cma_prime_mmap,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+};
+
+static int compare_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+static int st_init(struct drm_device *ddev)
+{
+	struct st_private *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	ddev->dev_private = (void *)priv;
+	dev_set_drvdata(ddev->dev, ddev);
+	priv->ddev = ddev;
+
+	drm_mode_config_init(ddev);
+
+	st_mode_config_init(ddev);
+
+	drm_kms_helper_poll_init(ddev);
+
+	return 0;
+}
+
+static void st_cleanup(struct drm_device *ddev)
+{
+	struct st_private *priv = ddev->dev_private;
+
+	if (priv->fbdev) {
+		drm_fbdev_cma_fini(priv->fbdev);
+		priv->fbdev = NULL;
+	}
+
+	drm_kms_helper_poll_fini(ddev);
+	drm_vblank_cleanup(ddev);
+	kfree(priv);
+	ddev->dev_private = NULL;
+}
+
+static int st_bind(struct device *dev)
+{
+	struct drm_device *ddev;
+	struct st_private *priv;
+	struct drm_fbdev_cma *fbdev;
+	int ret;
+
+	ddev = drm_dev_alloc(&st_driver, dev);
+	if (IS_ERR(ddev))
+		return PTR_ERR(ddev);
+
+	ddev->platformdev = to_platform_device(dev);
+
+	ret = st_init(ddev);
+	if (ret)
+		goto err_drm_dev_unref;
+
+	ret = component_bind_all(ddev->dev, ddev);
+	if (ret)
+		goto err_cleanup;
+
+	ret = drm_dev_register(ddev, 0);
+	if (ret)
+		goto err_register;
+
+	drm_mode_config_reset(ddev);
+
+	if (ddev->mode_config.num_connector) {
+		priv = ddev->dev_private;
+		fbdev = drm_fbdev_cma_init(ddev, 16,
+					   ddev->mode_config.num_crtc,
+					   ddev->mode_config.num_connector);
+		if (IS_ERR(fbdev)) {
+			DRM_DEBUG_DRIVER("Warning: fails to create fbdev\n");
+			fbdev = NULL;
+		}
+		priv->fbdev = fbdev;
+	}
+
+	return 0;
+
+err_register:
+	component_unbind_all(ddev->dev, ddev);
+err_cleanup:
+	st_cleanup(ddev);
+err_drm_dev_unref:
+	drm_dev_unref(ddev);
+	return ret;
+}
+
+static void st_unbind(struct device *dev)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+
+	drm_dev_unregister(ddev);
+	st_cleanup(ddev);
+	drm_dev_unref(ddev);
+}
+
+static const struct component_master_ops st_ops = {
+	.bind = st_bind,
+	.unbind = st_unbind,
+};
+
+static int st_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct device_node *child_np;
+	struct component_match *match = NULL;
+
+	dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+
+	of_platform_populate(node, NULL, NULL, dev);
+
+	child_np = of_get_next_available_child(node, NULL);
+
+	while (child_np) {
+		component_match_add(dev, &match, compare_of, child_np);
+		of_node_put(child_np);
+		child_np = of_get_next_available_child(node, child_np);
+	}
+
+	return component_master_add_with_match(dev, &st_ops, match);
+}
+
+static int st_platform_remove(struct platform_device *pdev)
+{
+	component_master_del(&pdev->dev, &st_ops);
+	of_platform_depopulate(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id st_dt_ids[] = {
+	{ .compatible = "st,display-subsystem", },
+	{ /* end node */ },
+};
+MODULE_DEVICE_TABLE(of, st_dt_ids);
+
+static struct platform_driver st_platform_driver = {
+	.probe = st_platform_probe,
+	.remove = st_platform_remove,
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = st_dt_ids,
+	},
+};
+
+static struct platform_driver * const drivers[] = {
+	&ltdc_driver,
+	&st_platform_driver,
+};
+
+static int st_drm_init(void)
+{
+	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_init(st_drm_init);
+
+static void st_drm_exit(void)
+{
+	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_exit(st_drm_exit);
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/st/drv.h b/drivers/gpu/drm/st/drv.h
new file mode 100644
index 0000000..d3da1bc
--- /dev/null
+++ b/drivers/gpu/drm/st/drv.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _DRV_H_
+#define _DRV_H_
+
+#include <drm/drmP.h>
+
+struct st_private {
+	struct ltdc *ltdc;
+	struct drm_device *ddev;
+	struct drm_fbdev_cma *fbdev;
+};
+
+extern struct platform_driver ltdc_driver;
+
+#endif
diff --git a/drivers/gpu/drm/st/ltdc.c b/drivers/gpu/drm/st/ltdc.c
new file mode 100644
index 0000000..46a7ab2
--- /dev/null
+++ b/drivers/gpu/drm/st/ltdc.c
@@ -0,0 +1,1438 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_address.h>
+#include <linux/of_graph.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_plane_helper.h>
+
+#include <video/videomode.h>
+
+#include "drv.h"
+#include "ltdc.h"
+
+#define NB_CRTC 1
+#define CRTC_MASK GENMASK(NB_CRTC - 1, 0)
+
+#define MAX_IRQ 4
+
+#define HWVER_10200 0x010200
+#define HWVER_10300 0x010300
+#define HWVER_20101 0x020101
+
+/*
+ * The address of some registers depends on the HW version: such registers have
+ * an extra offset specified with reg_ofs.
+ */
+#define REG_OFS_NONE	0
+#define REG_OFS_4	4 /* Insertion of "Layer Configuration 2" reg */
+#define REG_OFS		(ltdc->caps.reg_ofs)
+#define LAY_OFS		0x80	/* Register Offset between 2 layers */
+
+/* Global register offsets */
+#define LTDC_IDR	0x0000 /* IDentification */
+#define LTDC_LCR	0x0004 /* Layer Count */
+#define LTDC_SSCR	0x0008 /* Synchronization Size Configuration */
+#define LTDC_BPCR	0x000C /* Back Porch Configuration */
+#define LTDC_AWCR	0x0010 /* Active Width Configuration */
+#define LTDC_TWCR	0x0014 /* Total Width Configuration */
+#define LTDC_GCR	0x0018 /* Global Control */
+#define LTDC_GC1R	0x001C /* Global Configuration 1 */
+#define LTDC_GC2R	0x0020 /* Global Configuration 2 */
+#define LTDC_SRCR	0x0024 /* Shadow Reload Configuration */
+#define LTDC_GACR	0x0028 /* GAmma Correction */
+#define LTDC_BCCR	0x002C /* Background Color Configuration */
+#define LTDC_IER	0x0034 /* Interrupt Enable */
+#define LTDC_ISR	0x0038 /* Interrupt Status */
+#define LTDC_ICR	0x003C /* Interrupt Clear */
+#define LTDC_LIPCR	0x0040 /* Line Interrupt Position Configuration */
+#define LTDC_CPSR	0x0044 /* Current Position Status */
+#define LTDC_CDSR	0x0048 /* Current Display Status */
+
+/* Layer register offsets */
+#define LTDC_L1LC1R	(0x0080)	   /* L1 Layer Configuration 1 */
+#define LTDC_L1LC2R	(0x0084)	   /* L1 Layer Configuration 2 */
+#define LTDC_L1CR	(0x0084 + REG_OFS) /* L1 Control */
+#define LTDC_L1WHPCR	(0x0088 + REG_OFS) /* L1 Window Hor Position Config */
+#define LTDC_L1WVPCR	(0x008C + REG_OFS) /* L1 Window Vert Position Config */
+#define LTDC_L1CKCR	(0x0090 + REG_OFS) /* L1 Color Keying Configuration */
+#define LTDC_L1PFCR	(0x0094 + REG_OFS) /* L1 Pixel Format Configuration */
+#define LTDC_L1CACR	(0x0098 + REG_OFS) /* L1 Constant Alpha Config */
+#define LTDC_L1DCCR	(0x009C + REG_OFS) /* L1 Default Color Configuration */
+#define LTDC_L1BFCR	(0x00A0 + REG_OFS) /* L1 Blend Factors Configuration */
+#define LTDC_L1FBBCR	(0x00A4 + REG_OFS) /* L1 FrameBuffer Bus Control */
+#define LTDC_L1AFBCR	(0x00A8 + REG_OFS) /* L1 AuxFB Control */
+#define LTDC_L1CFBAR	(0x00AC + REG_OFS) /* L1 Color FrameBuffer Address */
+#define LTDC_L1CFBLR	(0x00B0 + REG_OFS) /* L1 Color FrameBuffer Length */
+#define LTDC_L1CFBLNR	(0x00B4 + REG_OFS) /* L1 Color FrameBuffer Line Nb */
+#define LTDC_L1AFBAR	(0x00B8 + REG_OFS) /* L1 AuxFB Address */
+#define LTDC_L1AFBLR	(0x00BC + REG_OFS) /* L1 AuxFB Length */
+#define LTDC_L1AFBLNR	(0x00C0 + REG_OFS) /* L1 AuxFB Line Number */
+#define LTDC_L1CLUTWR	(0x00C4 + REG_OFS) /* L1 CLUT Write */
+#define LTDC_L1YS1R	(0x00E0 + REG_OFS) /* L1 YCbCr Scale 1 */
+#define LTDC_L1YS2R	(0x00E4 + REG_OFS) /* L1 YCbCr Scale 2 */
+
+/* Bit definitions */
+#define SSCR_VSH	GENMASK(10, 0)	/* Vertical Synchronization Height */
+#define SSCR_HSW	GENMASK(27, 16)	/* Horizontal Synchronization Width */
+
+#define BPCR_AVBP	GENMASK(10, 0)	/* Accumulated Vertical Back Porch */
+#define BPCR_AHBP	GENMASK(27, 16)	/* Accumulated Horizontal Back Porch */
+
+#define AWCR_AAH	GENMASK(10, 0)	/* Accumulated Active Height */
+#define AWCR_AAW	GENMASK(27, 16)	/* Accumulated Active Width */
+
+#define TWCR_TOTALH	GENMASK(10, 0)	/* TOTAL Height */
+#define TWCR_TOTALW	GENMASK(27, 16)	/* TOTAL Width */
+
+#define GCR_LTDCEN	BIT(0)		/* LTDC ENable */
+#define GCR_DEN		BIT(16)		/* Dither ENable */
+#define GCR_PCPOL	BIT(28)		/* Pixel Clock POLarity */
+#define GCR_DEPOL	BIT(29)		/* Data Enable POLarity */
+#define GCR_VSPOL	BIT(30)		/* Vertical Synchro POLarity */
+#define GCR_HSPOL	BIT(31)		/* Horizontal Synchro POLarity */
+
+#define GC1R_WBCH	GENMASK(3, 0)	/* Width of Blue CHannel output */
+#define GC1R_WGCH	GENMASK(7, 4)	/* Width of Green Channel output */
+#define GC1R_WRCH	GENMASK(11, 8)	/* Width of Red Channel output */
+#define GC1R_PBEN	BIT(12)		/* Precise Blending ENable */
+#define GC1R_DT		GENMASK(15, 14)	/* Dithering Technique */
+#define GC1R_GCT	GENMASK(19, 17)	/* Gamma Correction Technique */
+#define GC1R_SHREN	BIT(21)		/* SHadow Registers ENabled */
+#define GC1R_BCP	BIT(22)		/* Background Colour Programmable */
+#define GC1R_BBEN	BIT(23)		/* Background Blending ENabled */
+#define GC1R_LNIP	BIT(24)		/* Line Number IRQ Position */
+#define GC1R_TP		BIT(25)		/* Timing Programmable */
+#define GC1R_IPP	BIT(26)		/* IRQ Polarity Programmable */
+#define GC1R_SPP	BIT(27)		/* Sync Polarity Programmable */
+#define GC1R_DWP	BIT(28)		/* Dither Width Programmable */
+#define GC1R_STREN	BIT(29)		/* STatus Registers ENabled */
+#define GC1R_BMEN	BIT(31)		/* Blind Mode ENabled */
+
+#define GC2R_EDCA	BIT(0)		/* External Display Control Ability  */
+#define GC2R_STSAEN	BIT(1)		/* Slave Timing Sync Ability ENabled */
+#define GC2R_DVAEN	BIT(2)		/* Dual-View Ability ENabled */
+#define GC2R_DPAEN	BIT(3)		/* Dual-Port Ability ENabled */
+#define GC2R_BW		GENMASK(6, 4)	/* Bus Width (log2 of nb of bytes) */
+#define GC2R_EDCEN	BIT(7)		/* External Display Control ENabled */
+
+#define SRCR_IMR	BIT(0)		/* IMmediate Reload */
+#define SRCR_VBR	BIT(1)		/* Vertical Blanking Reload */
+
+#define BCCR_BCBLACK	0x00		/* Background Color BLACK */
+#define BCCR_BCBLUE	GENMASK(7, 0)	/* Background Color BLUE */
+#define BCCR_BCGREEN	GENMASK(15, 8)	/* Background Color GREEN */
+#define BCCR_BCRED	GENMASK(23, 16)	/* Background Color RED */
+#define BCCR_BCWHITE	GENMASK(23, 0)	/* Background Color WHITE */
+
+#define IER_LIE		BIT(0)		/* Line Interrupt Enable */
+#define IER_FUIE	BIT(1)		/* Fifo Underrun Interrupt Enable */
+#define IER_TERRIE	BIT(2)		/* Transfer ERRor Interrupt Enable */
+#define IER_RRIE	BIT(3)		/* Register Reload Interrupt enable */
+
+#define ISR_LIF		BIT(0)		/* Line Interrupt Flag */
+#define ISR_FUIF	BIT(1)		/* Fifo Underrun Interrupt Flag */
+#define ISR_TERRIF	BIT(2)		/* Transfer ERRor Interrupt Flag */
+#define ISR_RRIF	BIT(3)		/* Register Reload Interrupt Flag */
+
+#define LXCR_LEN	BIT(0)		/* Layer ENable */
+#define LXCR_COLKEN	BIT(1)		/* Color Keying Enable */
+#define LXCR_CLUTEN	BIT(4)		/* Color Look-Up Table ENable */
+
+#define LXWHPCR_WHSTPOS	GENMASK(11, 0)	/* Window Horizontal StarT POSition */
+#define LXWHPCR_WHSPPOS	GENMASK(27, 16)	/* Window Horizontal StoP POSition */
+
+#define LXWVPCR_WVSTPOS	GENMASK(10, 0)	/* Window Vertical StarT POSition */
+#define LXWVPCR_WVSPPOS	GENMASK(26, 16)	/* Window Vertical StoP POSition */
+
+#define LXPFCR_PF	GENMASK(2, 0)	/* Pixel Format */
+
+#define LXCACR_CONSTA	GENMASK(7, 0)	/* CONSTant Alpha */
+
+#define LXBFCR_BF2	GENMASK(2, 0)	/* Blending Factor 2 */
+#define LXBFCR_BF1	GENMASK(10, 8)	/* Blending Factor 1 */
+
+#define LXCFBLR_CFBLL	GENMASK(12, 0)	/* Color Frame Buffer Line Length */
+#define LXCFBLR_CFBP	GENMASK(28, 16)	/* Color Frame Buffer Pitch in bytes */
+
+#define LXCFBLNR_CFBLN	GENMASK(10, 0)	 /* Color Frame Buffer Line Number */
+
+#define HSPOL_AL   0		/* Horizontal Sync POLarity Active Low */
+#define VSPOL_AL   0		/* Vertical Sync POLarity Active Low */
+#define DEPOL_AL   0		/* Data Enable POLarity Active Low */
+#define PCPOL_IPC  0		/* Input Pixel Clock */
+#define HSPOL_AH   GCR_HSPOL	/* Horizontal Sync POLarity Active High */
+#define VSPOL_AH   GCR_VSPOL	/* Vertical Sync POLarity Active High */
+#define DEPOL_AH   GCR_DEPOL	/* Data Enable POLarity Active High */
+#define PCPOL_IIPC GCR_PCPOL	/* Inverted Input Pixel Clock */
+#define CONSTA_MAX 0xFF		/* CONSTant Alpha MAX= 1.0 */
+#define BF1_PAXCA  0x600	/* Pixel Alpha x Constant Alpha */
+#define BF1_CA     0x400	/* Constant Alpha */
+#define BF2_1PAXCA 0x007	/* 1 - (Pixel Alpha x Constant Alpha) */
+#define BF2_1CA	   0x005	/* 1 - Constant Alpha */
+
+enum ltdc_pix_fmt {
+	PF_NONE,
+	/* RGB formats */
+	PF_ARGB8888,    /* ARGB [32 bits] */
+	PF_RGBA8888,    /* RGBA [32 bits] */
+	PF_RGB888,      /* RGB [24 bits] */
+	PF_RGB565,      /* RGB [16 bits] */
+	PF_ARGB1555,    /* ARGB A:1 bit RGB:15 bits [16 bits] */
+	PF_ARGB4444,    /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
+	/* Indexed formats */
+	PF_L8,          /* Indexed 8 bits [8 bits] */
+	PF_AL44,        /* Alpha:4 bits + indexed 4 bits [8 bits] */
+	PF_AL88         /* Alpha:8 bits + indexed 8 bits [16 bits] */
+};
+
+#define NB_PF           8       /* Max nb of HW pixel format */
+
+/* The index gives the encoding of the pixel format for an HW version */
+static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = {
+	PF_ARGB8888,	/* 0x00 */
+	PF_RGB888,	/* 0x01 */
+	PF_RGB565,	/* 0x02 */
+	PF_ARGB1555,	/* 0x03 */
+	PF_ARGB4444,	/* 0x04 */
+	PF_L8,		/* 0x05 */
+	PF_AL44,	/* 0x06 */
+	PF_AL88		/* 0x07 */
+};
+
+static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
+	PF_ARGB8888,	/* 0x00 */
+	PF_RGB888,	/* 0x01 */
+	PF_RGB565,	/* 0x02 */
+	PF_RGBA8888,	/* 0x03 */
+	PF_AL44,	/* 0x04 */
+	PF_L8,		/* 0x05 */
+	PF_ARGB1555,	/* 0x06 */
+	PF_ARGB4444	/* 0x07 */
+};
+
+struct ltdc_caps {
+	u32 hw_version;		/* hardware version */
+	u32 nb_layers;		/* number of supported layers */
+	u32 reg_ofs;		/* register offset for applicable regs */
+	u32 bus_width;		/* bus width (32 or 64 bits) */
+	const enum ltdc_pix_fmt *pix_fmt_hw; /* supported pixel formats */
+};
+
+struct ltdc {
+	struct device *dev;
+	struct drm_device *ddev;
+	struct regmap *map;
+	struct clk *pixel_clk;	/* lcd pixel clock */
+	struct drm_panel *panel;
+	struct drm_pending_vblank_event *pending_event;
+	u32 irq_status;
+	u32 error_status;
+	struct mutex err_lock;	/* protecting error_status */
+	struct ltdc_caps caps;
+	u32 clut[256];		/* color look up table */
+};
+
+static struct regmap_config ltdc_regmap_config = {
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= 0x400,
+	.fast_io	= true,
+};
+
+static inline struct ltdc *crtc_to_ltdc(struct drm_crtc *crtc)
+{
+	return ((struct st_private *)crtc->dev->dev_private)->ltdc;
+}
+
+static inline struct ltdc *plane_to_ltdc(struct drm_plane *plane)
+{
+	return ((struct st_private *)plane->dev->dev_private)->ltdc;
+}
+
+static inline struct ltdc *encoder_to_ltdc(struct drm_encoder *encoder)
+{
+	return ((struct st_private *)encoder->dev->dev_private)->ltdc;
+}
+
+static inline struct ltdc *connector_to_ltdc(struct drm_connector *connector)
+{
+	return ((struct st_private *)connector->dev->dev_private)->ltdc;
+}
+
+static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
+{
+	enum ltdc_pix_fmt pf;
+
+	switch (drm_fmt) {
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XRGB8888:
+		pf = PF_ARGB8888;
+		break;
+	case DRM_FORMAT_RGBA8888:
+	case DRM_FORMAT_RGBX8888:
+		pf = PF_RGBA8888;
+		break;
+	case DRM_FORMAT_RGB888:
+		pf = PF_RGB888;
+		break;
+	case DRM_FORMAT_RGB565:
+		pf = PF_RGB565;
+		break;
+	case DRM_FORMAT_ARGB1555:
+	case DRM_FORMAT_XRGB1555:
+		pf = PF_ARGB1555;
+		break;
+	case DRM_FORMAT_ARGB4444:
+	case DRM_FORMAT_XRGB4444:
+		pf = PF_ARGB4444;
+		break;
+	case DRM_FORMAT_C8:
+		pf = PF_L8;
+		break;
+	default:
+		pf = PF_NONE;
+		break;
+	/* Note: There are no DRM_FORMAT for AL44 and AL88 */
+	}
+
+	return pf;
+}
+
+static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
+{
+	switch (pf) {
+	case PF_ARGB8888:
+		return DRM_FORMAT_ARGB8888;
+	case PF_RGBA8888:
+		return DRM_FORMAT_RGBA8888;
+	case PF_RGB888:
+		return DRM_FORMAT_RGB888;
+	case PF_RGB565:
+		return DRM_FORMAT_RGB565;
+	case PF_ARGB1555:
+		return DRM_FORMAT_ARGB1555;
+	case PF_ARGB4444:
+		return DRM_FORMAT_ARGB4444;
+	case PF_L8:
+		return DRM_FORMAT_C8;
+	case PF_AL44: /* No DRM support */
+	case PF_AL88: /* No DRM support */
+	case PF_NONE:
+	default:
+		return 0;
+	}
+}
+
+static struct drm_crtc *crtc_from_pipe(struct drm_device *ddev,
+				       unsigned int pipe)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &ddev->mode_config.crtc_list, head) {
+		if (pipe == drm_crtc_index(crtc))
+			return crtc;
+	}
+
+	return NULL;
+}
+
+static void ltdc_send_vblank(struct ltdc *ltdc)
+{
+	struct drm_device *ddev = ltdc->ddev;
+	struct drm_crtc *crtc = crtc_from_pipe(ddev, 0);
+	unsigned long flags;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	drm_crtc_handle_vblank(crtc);
+
+	spin_lock_irqsave(&ddev->event_lock, flags);
+	if (ltdc->pending_event) {
+		drm_crtc_send_vblank_event(crtc, ltdc->pending_event);
+		drm_crtc_vblank_put(crtc);
+		ltdc->pending_event = NULL;
+	}
+
+	spin_unlock_irqrestore(&ddev->event_lock, flags);
+}
+
+static irqreturn_t ltdc_irq_thread(int irq, void *arg)
+{
+	struct ltdc *ltdc = arg;
+
+	/* Line IRQ : trigger the vblank event */
+	if (ltdc->irq_status & ISR_LIF)
+		ltdc_send_vblank(ltdc);
+
+	/* Save FIFO Underrun & Transfer Error status */
+	mutex_lock(&ltdc->err_lock);
+	if (ltdc->irq_status & ISR_FUIF)
+		ltdc->error_status |= ISR_FUIF;
+	if (ltdc->irq_status & ISR_TERRIF)
+		ltdc->error_status |= ISR_TERRIF;
+	mutex_unlock(&ltdc->err_lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ltdc_irq(int irq, void *arg)
+{
+	struct ltdc *ltdc = arg;
+
+	/* Read & Clear the interrupt status */
+	regmap_read(ltdc->map, LTDC_ISR, &ltdc->irq_status);
+	regmap_write(ltdc->map, LTDC_ICR, ltdc->irq_status);
+
+	return IRQ_WAKE_THREAD;
+}
+
+/*
+ * DRM_CRTC
+ */
+
+static void ltdc_crtc_load_lut(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	unsigned int i, lay;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	for (lay = 0; lay < ltdc->caps.nb_layers; lay++)
+		for (i = 0; i < 256; i++)
+			regmap_write(ltdc->map, LTDC_L1CLUTWR + lay * LAY_OFS,
+				     ltdc->clut[i]);
+}
+
+static void ltdc_crtc_enable(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+
+	DRM_DEBUG_DRIVER("\n");
+
+	if (clk_enable(ltdc->pixel_clk))
+		DRM_ERROR("failed to enable pixel clock\n");
+
+	/* Sets the background color value */
+	regmap_write(ltdc->map, LTDC_BCCR, BCCR_BCBLACK);
+
+	/* Enable IRQ */
+	regmap_update_bits(ltdc->map, LTDC_IER,
+			   IER_RRIE | IER_FUIE | IER_TERRIE,
+			   IER_RRIE | IER_FUIE | IER_TERRIE);
+
+	/* Immediately commit the planes */
+	regmap_update_bits(ltdc->map, LTDC_SRCR, SRCR_IMR, SRCR_IMR);
+
+	/* Enable LTDC */
+	regmap_update_bits(ltdc->map, LTDC_GCR, GCR_LTDCEN, GCR_LTDCEN);
+
+	drm_crtc_vblank_on(crtc);
+}
+
+static void ltdc_crtc_disable(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	unsigned int i;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	if (!crtc->enabled) {
+		DRM_DEBUG_DRIVER("already disabled\n");
+		return;
+	}
+
+	drm_crtc_vblank_off(crtc);
+
+	/* disable LTDC */
+	regmap_update_bits(ltdc->map, LTDC_GCR, GCR_LTDCEN, 0);
+
+	/* disable IRQ */
+	regmap_update_bits(ltdc->map, LTDC_IER,
+			   IER_RRIE | IER_FUIE | IER_TERRIE, 0);
+
+	/* disable layers */
+	for (i = 0; i < ltdc->caps.nb_layers; i++)
+		regmap_update_bits(ltdc->map, LTDC_L1CR + i * LAY_OFS,
+				   LXCR_LEN, 0);
+
+	/* immediately commit disable of layers before switching off LTDC */
+	regmap_write(ltdc->map, LTDC_SRCR, SRCR_IMR);
+
+	clk_disable(ltdc->pixel_clk);
+
+	if (crtc->state->event && !crtc->state->active) {
+		spin_lock_irq(&crtc->dev->event_lock);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+
+		crtc->state->event = NULL;
+	}
+}
+
+static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
+				 const struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted_mode)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+	/* accept the provided drm_display_mode, do not fix it up */
+	return true;
+}
+
+static u32 ltdc_get_paddr(struct drm_framebuffer *fb, int x, int y)
+{
+	struct drm_gem_cma_object *cma_obj;
+	unsigned int pixsize;
+	u32 paddr;
+
+	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	if (IS_ERR(cma_obj)) {
+		DRM_ERROR("Can't get CMA GEM object for fb\n");
+		return 0;
+	}
+
+	pixsize = drm_format_plane_cpp(fb->format->format, 0);
+	paddr = (u32)cma_obj->paddr + fb->offsets[0];
+	paddr += (x * pixsize) + (y * fb->pitches[0]);
+
+	return paddr;
+}
+
+static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+	struct videomode vm;
+	int rate = mode->clock * 1000;
+	u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
+	u32 total_width, total_height;
+	u32 val;
+
+	drm_display_mode_to_videomode(mode, &vm);
+
+	dev_dbg(ltdc->dev, "CRTC:%d mode:%s\n", crtc->base.id, mode->name);
+	dev_dbg(ltdc->dev, "Video mode: %dx%d", vm.hactive, vm.vactive);
+	dev_dbg(ltdc->dev, " hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
+		vm.hfront_porch, vm.hback_porch, vm.hsync_len,
+		vm.vfront_porch, vm.vback_porch, vm.vsync_len);
+
+	/* Convert video timings to ltdc timings */
+	hsync = vm.hsync_len - 1;
+	vsync = vm.vsync_len - 1;
+	accum_hbp = hsync + vm.hback_porch;
+	accum_vbp = vsync + vm.vback_porch;
+	accum_act_w = accum_hbp + vm.hactive;
+	accum_act_h = accum_vbp + vm.vactive;
+	total_width = accum_act_w + vm.hfront_porch;
+	total_height = accum_act_h + vm.vfront_porch;
+
+	if (clk_set_rate(ltdc->pixel_clk, rate) < 0) {
+		DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
+		return;
+	}
+
+	/*
+	 * Configures the HS, VS, DE and PC polarities.
+	 * It would be better to get polarities from panel, but since
+	 * these values are quite standard, use hard coded values here
+	 */
+	val = HSPOL_AL | VSPOL_AL | DEPOL_AL | PCPOL_IPC;
+	regmap_update_bits(ltdc->map, LTDC_GCR, GCR_HSPOL | GCR_VSPOL |
+			   GCR_DEPOL | GCR_PCPOL, val);
+
+	/* Set Synchronization size */
+	val = (hsync << 16) | vsync;
+	regmap_update_bits(ltdc->map, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
+
+	/* Set Accumulated Back porch */
+	val = (accum_hbp << 16) | accum_vbp;
+	regmap_update_bits(ltdc->map, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
+
+	/* Set Accumulated Active Width */
+	val = (accum_act_w << 16) | accum_act_h;
+	regmap_update_bits(ltdc->map, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
+
+	/* Set total width & height */
+	val = (total_width << 16) | total_height;
+	regmap_update_bits(ltdc->map, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW,
+			   val);
+}
+
+static void ltdc_crtc_atomic_begin(struct drm_crtc *crtc,
+				   struct drm_crtc_state *old_crtc_state)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	unsigned long flags;
+
+	DRM_DEBUG_ATOMIC("\n");
+
+	if (crtc->state->event) {
+		if (drm_crtc_vblank_get(crtc) != 0)
+			DRM_DEBUG_ATOMIC("Failed do get vblank");
+
+		spin_lock_irqsave(&crtc->dev->event_lock, flags);
+		ltdc->pending_event = crtc->state->event;
+		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+
+		crtc->state->event = NULL;
+	}
+}
+
+static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
+				   struct drm_crtc_state *old_crtc_state)
+{
+	struct ltdc *ltdc = crtc_to_ltdc(crtc);
+	struct drm_pending_vblank_event *event = crtc->state->event;
+
+	DRM_DEBUG_ATOMIC("\n");
+
+	/* Commit shadow registers = update planes at next vblank */
+	regmap_update_bits(ltdc->map, LTDC_SRCR, SRCR_VBR, SRCR_VBR);
+
+	if (event) {
+		crtc->state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		if (drm_crtc_vblank_get(crtc) == 0)
+			drm_crtc_arm_vblank_event(crtc, event);
+		else
+			drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+}
+
+static struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
+	.load_lut = ltdc_crtc_load_lut,
+	.enable = ltdc_crtc_enable,
+	.disable = ltdc_crtc_disable,
+	.mode_fixup = ltdc_crtc_mode_fixup,
+	.mode_set_nofb = ltdc_crtc_mode_set_nofb,
+	.atomic_begin = ltdc_crtc_atomic_begin,
+	.atomic_flush = ltdc_crtc_atomic_flush,
+};
+
+int ltdc_crtc_enable_vblank(struct drm_device *ddev, unsigned int pipe)
+{
+	struct st_private *priv = ddev->dev_private;
+	struct ltdc *ltdc = priv->ltdc;
+
+	DRM_DEBUG_DRIVER("\n");
+	regmap_update_bits(ltdc->map, LTDC_IER, IER_LIE, IER_LIE);
+
+	return 0;
+}
+
+void ltdc_crtc_disable_vblank(struct drm_device *ddev, unsigned int pipe)
+{
+	struct drm_crtc *crtc = crtc_from_pipe(ddev, pipe);
+	struct st_private *priv = ddev->dev_private;
+	struct ltdc *ltdc = priv->ltdc;
+
+	DRM_DEBUG_DRIVER("\n");
+	regmap_update_bits(ltdc->map, LTDC_IER, IER_LIE, 0);
+
+	if (ltdc->pending_event) {
+		drm_crtc_vblank_put(crtc);
+		ltdc->pending_event = NULL;
+	}
+}
+
+static struct drm_crtc_funcs ltdc_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,
+};
+
+/*
+ * DRM_PLANE
+ */
+
+static int ltdc_plane_atomic_check(struct drm_plane *plane,
+				   struct drm_plane_state *state)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+	struct drm_framebuffer *fb = state->fb;
+	u32 src_x, src_y, src_w, src_h;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (!fb)
+		return 0;
+
+	/* convert src_ from 16:16 format */
+	src_x = state->src_x >> 16;
+	src_y = state->src_y >> 16;
+	src_w = state->src_w >> 16;
+	src_h = state->src_h >> 16;
+
+	/* Reject scaling */
+	if ((src_w != state->crtc_w) || (src_h != state->crtc_h)) {
+		DRM_ERROR("Scaling is not supported");
+		return -EINVAL;
+	}
+
+	if (!ltdc_get_paddr(fb, src_x, src_y)) {
+		DRM_ERROR("Cannot get fb address\n");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static void ltdc_plane_atomic_update(struct drm_plane *plane,
+				     struct drm_plane_state *oldstate)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+	struct drm_plane_state *state = plane->state;
+	struct drm_framebuffer *fb = state->fb;
+	u32 lofs = plane->index * LAY_OFS;
+	u32 x0 = state->crtc_x;
+	u32 x1 = state->crtc_x + state->crtc_w - 1;
+	u32 y0 = state->crtc_y;
+	u32 y1 = state->crtc_y + state->crtc_h - 1;
+	u32 src_x, src_y, src_w, src_h;
+	u32 val, pitch_in_bytes, line_length, paddr, ahbp, avbp, bpcr;
+	enum ltdc_pix_fmt pf;
+
+	if (!state->crtc || !fb) {
+		DRM_DEBUG_DRIVER("fb or crtc NULL");
+		return;
+	}
+
+	/* convert src_ from 16:16 format */
+	src_x = state->src_x >> 16;
+	src_y = state->src_y >> 16;
+	src_w = state->src_w >> 16;
+	src_h = state->src_h >> 16;
+
+	DRM_DEBUG_DRIVER(
+		"plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n",
+		plane->base.id, fb->base.id,
+		src_w, src_h, src_x, src_y,
+		state->crtc_w, state->crtc_h, state->crtc_x, state->crtc_y);
+
+	regmap_read(ltdc->map, LTDC_BPCR, &bpcr);
+	ahbp = (bpcr & BPCR_AHBP) >> 16;
+	avbp = bpcr & BPCR_AVBP;
+
+	/* Configures the horizontal start and stop position */
+	val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
+	regmap_update_bits(ltdc->map, LTDC_L1WHPCR + lofs,
+			   LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
+
+	/* Configures the vertical start and stop position */
+	val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
+	regmap_update_bits(ltdc->map, LTDC_L1WVPCR + lofs,
+			   LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
+
+	/* Specifies the pixel format */
+	pf = to_ltdc_pixelformat(fb->format->format);
+	for (val = 0; val < NB_PF; val++)
+		if (ltdc->caps.pix_fmt_hw[val] == pf)
+			break;
+
+	if (val == NB_PF) {
+		DRM_ERROR("Pixel format %.4s not supported\n",
+			  (char *)&fb->format->format);
+		val = 0; /* set by default ARGB 32 bits */
+	}
+	regmap_update_bits(ltdc->map, LTDC_L1PFCR + lofs,
+			   LXPFCR_PF, val);
+
+	/* Configures the color frame buffer pitch in bytes & line length */
+	pitch_in_bytes = fb->pitches[0];
+	line_length = drm_format_plane_cpp(fb->format->format, 0) *
+		      (x1 - x0 + 1) + (ltdc->caps.bus_width >> 3) - 1;
+	val = ((pitch_in_bytes << 16) | line_length);
+	regmap_update_bits(ltdc->map, LTDC_L1CFBLR + lofs,
+			   LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
+
+	/* Specifies the constant alpha value */
+	val = CONSTA_MAX;
+	regmap_update_bits(ltdc->map, LTDC_L1CACR + lofs,
+			   LXCACR_CONSTA, val);
+
+	/* Specifies the blending factors */
+	val = BF1_PAXCA | BF2_1PAXCA;
+	regmap_update_bits(ltdc->map, LTDC_L1BFCR + lofs,
+			   LXBFCR_BF2 | LXBFCR_BF1, val);
+
+	/* Configures the frame buffer line number */
+	val = y1 - y0 + 1;
+	regmap_update_bits(ltdc->map, LTDC_L1CFBLNR + lofs,
+			   LXCFBLNR_CFBLN, val);
+
+	/* Sets the FB address */
+	paddr = ltdc_get_paddr(fb, src_x, src_y);
+	dev_dbg(ltdc->dev, "fb: phys 0x%08x", paddr);
+	regmap_write(ltdc->map, LTDC_L1CFBAR + lofs, paddr);
+
+	/* Enable layer and CLUT if needed */
+	val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
+	val |= LXCR_LEN;
+	regmap_update_bits(ltdc->map, LTDC_L1CR + lofs,
+			   LXCR_LEN | LXCR_CLUTEN, val);
+
+	mutex_lock(&ltdc->err_lock);
+	if (ltdc->error_status & ISR_FUIF) {
+		dev_dbg(ltdc->dev, "Fifo underrun\n");
+		ltdc->error_status &= ~ISR_FUIF;
+	}
+	if (ltdc->error_status & ISR_TERRIF) {
+		dev_dbg(ltdc->dev, "Transfer error\n");
+		ltdc->error_status &= ~ISR_TERRIF;
+	}
+	mutex_unlock(&ltdc->err_lock);
+}
+
+static void ltdc_plane_atomic_disable(struct drm_plane *plane,
+				      struct drm_plane_state *oldstate)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+	u32 lofs = plane->index * LAY_OFS;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (!oldstate->crtc) {
+		DRM_DEBUG_DRIVER("drm plane:%d not enabled\n", plane->base.id);
+		return;
+	}
+
+	/* disable layer */
+	regmap_update_bits(ltdc->map, LTDC_L1CR + lofs, LXCR_LEN, 0);
+
+	DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
+			 oldstate->crtc->base.id, plane->base.id);
+}
+
+static void ltdc_plane_destroy(struct drm_plane *plane)
+{
+	struct ltdc *ltdc = plane_to_ltdc(plane);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	drm_plane_helper_disable(plane);
+	drm_plane_cleanup(plane);
+}
+
+static struct drm_plane_funcs ltdc_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = ltdc_plane_destroy,
+	.set_property = drm_atomic_helper_plane_set_property,
+	.reset = drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
+	.atomic_check = ltdc_plane_atomic_check,
+	.atomic_update = ltdc_plane_atomic_update,
+	.atomic_disable = ltdc_plane_atomic_disable,
+};
+
+static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
+					   enum drm_plane_type type)
+{
+	struct st_private *priv = ddev->dev_private;
+	unsigned long possible_crtcs = CRTC_MASK;
+	struct ltdc *ltdc = priv->ltdc;
+	struct drm_plane *plane;
+	unsigned int i, nb_fmt = 0;
+	u32 formats[NB_PF];
+	u32 drm_fmt;
+	int err;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	/* Get supported pixel formats */
+	for (i = 0; i < NB_PF; i++) {
+		drm_fmt = to_drm_pixelformat(ltdc->caps.pix_fmt_hw[i]);
+		if (!drm_fmt)
+			continue;
+		formats[nb_fmt++] = drm_fmt;
+	}
+
+	plane = devm_kzalloc(ltdc->dev, sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return 0;
+
+	err = drm_universal_plane_init(ddev, plane, possible_crtcs,
+				       &ltdc_plane_funcs, formats, nb_fmt,
+				       type, NULL);
+	if (err < 0)
+		return 0;
+
+	drm_plane_helper_add(plane, &ltdc_plane_helper_funcs);
+
+	DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
+
+	return plane;
+}
+
+static void ltdc_plane_destroy_all(struct ltdc *ltdc)
+{
+	struct drm_plane *plane, *plane_temp;
+
+	list_for_each_entry_safe(plane, plane_temp,
+				 &ltdc->ddev->mode_config.plane_list, head)
+		drm_plane_cleanup(plane);
+}
+
+static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
+{
+	struct st_private *priv = ddev->dev_private;
+	struct ltdc *ltdc = priv->ltdc;
+	struct drm_plane *primary, *overlay;
+	unsigned int i;
+	int res;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY);
+	if (!primary) {
+		DRM_ERROR("Can not create primary plane\n");
+		return -EINVAL;
+	}
+
+	res = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
+					&ltdc_crtc_funcs, NULL);
+	if (res) {
+		DRM_ERROR("Can not initialize CRTC\n");
+		goto cleanup;
+	}
+
+	drm_crtc_helper_add(crtc, &ltdc_crtc_helper_funcs);
+
+	DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
+
+	/* Add planes. Note : the first layer is used by primary plane */
+	for (i = 1; i < ltdc->caps.nb_layers; i++) {
+		overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY);
+		if (!overlay) {
+			res = -ENOMEM;
+			DRM_ERROR("Can not create overlay plane %d\n", i);
+			goto cleanup;
+		}
+	}
+
+	return 0;
+
+cleanup:
+	ltdc_plane_destroy_all(ltdc);
+	return res;
+}
+
+/*
+ * DRM_ENCODER
+ */
+
+static void ltdc_rgb_encoder_enable(struct drm_encoder *encoder)
+{
+	struct ltdc *ltdc = encoder_to_ltdc(encoder);
+
+	DRM_DEBUG_DRIVER("\n");
+	drm_panel_prepare(ltdc->panel);
+	drm_panel_enable(ltdc->panel);
+}
+
+static void ltdc_rgb_encoder_disable(struct drm_encoder *encoder)
+{
+	struct ltdc *ltdc = encoder_to_ltdc(encoder);
+
+	DRM_DEBUG_DRIVER("\n");
+
+	drm_panel_disable(ltdc->panel);
+	drm_panel_unprepare(ltdc->panel);
+}
+
+static const struct drm_encoder_helper_funcs ltdc_rgb_encoder_helper_funcs = {
+	.enable = ltdc_rgb_encoder_enable,
+	.disable = ltdc_rgb_encoder_disable,
+};
+
+static const struct drm_encoder_funcs ltdc_rgb_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static struct drm_encoder *ltdc_rgb_encoder_create(struct drm_device *ddev)
+{
+	struct drm_encoder *encoder;
+
+	encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
+	if (!encoder)
+		return NULL;
+
+	encoder->possible_crtcs = CRTC_MASK;
+	encoder->possible_clones = 0; /* No cloning support */
+
+	drm_encoder_init(ddev, encoder, &ltdc_rgb_encoder_funcs,
+			 DRM_MODE_ENCODER_LVDS, NULL);
+
+	drm_encoder_helper_add(encoder, &ltdc_rgb_encoder_helper_funcs);
+
+	DRM_DEBUG_DRIVER("RGB encoder:%d created\n", encoder->base.id);
+
+	return encoder;
+}
+
+static struct drm_encoder *ltdc_rgb_encoder_find(struct drm_device *ddev)
+{
+	struct drm_encoder *encoder;
+
+	list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head) {
+		if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS)
+			return encoder;
+	}
+
+	return NULL;
+}
+
+static int ltdc_create_encoders(struct ltdc *ltdc)
+{
+	struct drm_device *ddev = ltdc->ddev;
+	struct drm_encoder *encoder;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel) {
+		encoder = ltdc_rgb_encoder_create(ddev);
+		if (!encoder)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void ltdc_destroy_encoders(struct ltdc *ltdc)
+{
+	struct drm_encoder *encoder, *encoder_temp;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	list_for_each_entry_safe(encoder, encoder_temp,
+				 &ltdc->ddev->mode_config.encoder_list, head)
+		drm_encoder_cleanup(encoder);
+}
+
+/*
+ * DRM_CONNECTOR
+ */
+
+static int ltdc_rgb_connector_get_modes(struct drm_connector *connector)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+	int ret = 0;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel)
+		ret = drm_panel_get_modes(ltdc->panel);
+
+	return ret < 0 ? 0 : ret;
+}
+
+/* Set a tolerance of 10% on pixel clock */
+#define CLK_TOLERANCE_PCT 10
+
+static enum drm_mode_status
+ltdc_rgb_connector_mode_valid(struct drm_connector *connector,
+			      struct drm_display_mode *mode)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+	unsigned long rate = mode->clock * 1000;
+	long rate_min = rate - (rate * CLK_TOLERANCE_PCT) / 100;
+	long rate_max = rate;
+	long rounded_rate;
+
+	rounded_rate = clk_round_rate(ltdc->pixel_clk, rate);
+
+	DRM_DEBUG_DRIVER("Target rate = %ld => available rate = %ld\n",
+			 rate, rounded_rate);
+
+	if (rounded_rate < rate_min)
+		return MODE_CLOCK_LOW;
+
+	if (rounded_rate > rate_max)
+		return MODE_CLOCK_HIGH;
+
+	if (!rate)
+		return MODE_BAD;
+
+	return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs ltdc_rgb_connector_helper_funcs = {
+	.get_modes = ltdc_rgb_connector_get_modes,
+	.mode_valid = ltdc_rgb_connector_mode_valid,
+};
+
+static enum drm_connector_status
+ltdc_rgb_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+	int ret = 0;
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel) {
+		ret = drm_panel_attach(ltdc->panel, connector);
+
+		if (!ret || ret == -EBUSY) {
+			DRM_DEBUG_DRIVER("connector status connected");
+			return connector_status_connected;
+		}
+	}
+
+	DRM_DEBUG_DRIVER("connector status disconnected");
+	return connector_status_disconnected;
+}
+
+static void ltdc_rgb_connector_destroy(struct drm_connector *connector)
+{
+	struct ltdc *ltdc = connector_to_ltdc(connector);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	if (ltdc->panel)
+		drm_panel_detach(ltdc->panel);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs ltdc_rgb_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = ltdc_rgb_connector_detect,
+	.destroy = ltdc_rgb_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+struct drm_connector *ltdc_rgb_connector_create(struct drm_device *ddev)
+{
+	struct drm_connector *connector;
+	int err;
+
+	connector = devm_kzalloc(ddev->dev, sizeof(*connector), GFP_KERNEL);
+	if (!connector) {
+		DRM_ERROR("Failed to allocate connector\n");
+		return NULL;
+	}
+
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+	err = drm_connector_init(ddev, connector, &ltdc_rgb_connector_funcs,
+				 DRM_MODE_CONNECTOR_LVDS);
+	if (err) {
+		DRM_ERROR("Failed to initialize connector\n");
+		return NULL;
+	}
+
+	drm_connector_helper_add(connector, &ltdc_rgb_connector_helper_funcs);
+
+	DRM_DEBUG_DRIVER("RGB connector:%d created\n", connector->base.id);
+
+	return connector;
+}
+
+/*
+ * PROBE & BINDING
+ */
+
+static int ltdc_bind(struct device *dev, struct device *master, void *data)
+{
+	struct ltdc *ltdc = dev_get_drvdata(dev);
+	struct drm_device *ddev = data;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector = NULL;
+	struct st_private *priv = ddev->dev_private;
+	struct drm_crtc *crtc;
+	int err;
+
+	dev_dbg(ltdc->dev, "%s drm_device *dev 0x%08x\n",
+		__func__, (u32)(ddev));
+
+	priv->ltdc = ltdc;
+	ltdc->ddev = ddev;
+
+	if (ltdc_create_encoders(ltdc)) {
+		DRM_ERROR("Failed to create encoders\n");
+		return -EINVAL;
+	}
+
+	if (ltdc->panel) {
+		encoder = ltdc_rgb_encoder_find(ddev);
+		if (!encoder) {
+			DRM_ERROR("Failed to find RGB encoder\n");
+			err = -EINVAL;
+			goto err_encoder;
+		}
+
+		connector = ltdc_rgb_connector_create(ddev);
+		if (!connector) {
+			DRM_ERROR("Failed to create RGB connector\n");
+			err = -EINVAL;
+			goto err_encoder;
+		}
+
+		err = drm_mode_connector_attach_encoder(connector, encoder);
+		if (err) {
+			DRM_ERROR("Failed to attach connector to encoder\n");
+			goto err_connector;
+		}
+	}
+
+	crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
+	if (!crtc) {
+		DRM_ERROR("Failed to allocate crtc\n");
+		err = -ENOMEM;
+		goto err_connector;
+	}
+
+	err = ltdc_crtc_init(ddev, crtc);
+	if (err) {
+		DRM_ERROR("Failed to init crtc\n");
+		goto err_connector;
+	}
+
+	err = drm_vblank_init(ddev, NB_CRTC);
+	if (err) {
+		DRM_ERROR("Failed calling drm_vblank_init()\n");
+		goto err_vblank;
+	}
+
+	/* Allow usage of vblank without having to call drm_irq_install */
+	ddev->irq_enabled = 1;
+
+	return 0;
+
+err_vblank:
+	ltdc_plane_destroy_all(ltdc);
+err_connector:
+	ltdc_rgb_connector_destroy(connector);
+err_encoder:
+	ltdc_destroy_encoders(ltdc);
+
+	return err;
+}
+
+static void ltdc_unbind(struct device *dev, struct device *master, void *data)
+{
+	struct ltdc *ltdc = dev_get_drvdata(dev);
+
+	dev_dbg(ltdc->dev, "%s\n", __func__);
+
+	drm_vblank_cleanup(ltdc->ddev);
+	ltdc_plane_destroy_all(ltdc);
+	ltdc_destroy_encoders(ltdc);
+}
+
+static const struct component_ops ltdc_ops = {
+	.bind = ltdc_bind,
+	.unbind = ltdc_unbind,
+};
+
+static int ltdc_get_caps(struct ltdc *ltdc)
+{
+	u32 bus_width_log2, lcr, gc2r;
+
+	/* at least 1 layer must be managed */
+	regmap_read(ltdc->map, LTDC_LCR, &lcr);
+
+	ltdc->caps.nb_layers = max_t(int, lcr, 1);
+
+	/* set data bus width */
+	regmap_read(ltdc->map, LTDC_GC2R, &gc2r);
+	bus_width_log2 = (gc2r & GC2R_BW) >> 4;
+	ltdc->caps.bus_width = 8 << bus_width_log2;
+	regmap_read(ltdc->map, LTDC_IDR, &ltdc->caps.hw_version);
+
+	switch (ltdc->caps.hw_version) {
+	case HWVER_10200:
+	case HWVER_10300:
+		ltdc->caps.reg_ofs = REG_OFS_NONE;
+		ltdc->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
+		break;
+	case HWVER_20101:
+		ltdc->caps.reg_ofs = REG_OFS_4;
+		ltdc->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int ltdc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct reset_control *rstc;
+	struct resource res;
+	struct ltdc *ltdc;
+	struct drm_panel *panel = NULL;
+	struct device_node *entity, *remote_pt = NULL;
+	void __iomem *regs;
+	int irq, ret, i;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	/*
+	 * Parse ltdc node to get remote port and find RGB panel / HDMI slave
+	 * If a dsi or a bridge (hdmi, lvds...) is connected to ltdc,
+	 * a remote port & RGB panel will not be found.
+	 */
+	for_each_endpoint_of_node(np, entity) {
+		if (!of_device_is_available(entity))
+			continue;
+
+		remote_pt = of_graph_get_remote_port_parent(entity);
+		if (remote_pt) {
+			if (!panel) {
+				panel = of_drm_find_panel(remote_pt);
+				of_node_put(remote_pt);
+				if (panel) {
+					dev_dbg(dev, "remote panel %s\n",
+						remote_pt->full_name);
+				} else {
+					dev_dbg(dev, "deferred (panel missing)\n");
+					of_node_put(entity);
+					return -EPROBE_DEFER;
+				}
+			}
+		}
+	}
+
+	ltdc = devm_kzalloc(dev, sizeof(*ltdc), GFP_KERNEL);
+	if (!ltdc) {
+		DRM_ERROR("Cannot allocate memory for ltdc\n");
+		return -ENOMEM;
+	}
+
+	ltdc->dev = dev;
+	ltdc->panel = panel;
+
+	rstc = of_reset_control_get(np, NULL);
+
+	mutex_init(&ltdc->err_lock);
+
+	ltdc->pixel_clk = devm_clk_get(dev, "clk-lcd");
+	if (IS_ERR(ltdc->pixel_clk)) {
+		DRM_ERROR("Unable to get lcd clock\n");
+		return -ENODEV;
+	}
+
+	if (of_address_to_resource(np, 0, &res)) {
+		DRM_ERROR("Unable to get resource\n");
+		return -ENODEV;
+	}
+
+	regs = devm_ioremap_resource(dev, &res);
+	if (IS_ERR(regs)) {
+		DRM_ERROR("Unable to get ltdc registers\n");
+		return PTR_ERR(regs);
+	}
+
+	ltdc->map = devm_regmap_init_mmio_clk(dev, "clk-lcd", regs,
+					      &ltdc_regmap_config);
+	if (IS_ERR(ltdc->map)) {
+		dev_err(dev, "Couldn't create ltdc register mapping\n");
+		return PTR_ERR(ltdc->map);
+	}
+
+	for (i = 0; i < MAX_IRQ; i++) {
+		irq = platform_get_irq(pdev, i);
+		if (irq < 0)
+			continue;
+
+		ret = devm_request_threaded_irq(dev, irq, ltdc_irq,
+						ltdc_irq_thread, IRQF_ONESHOT,
+						dev_name(dev), ltdc);
+		if (ret) {
+			DRM_ERROR("Failed to register LTDC interrupt\n");
+			return ret;
+		}
+	}
+
+	if (!IS_ERR(rstc))
+		reset_control_deassert(rstc);
+
+	/* Disable interrupts */
+	regmap_update_bits(ltdc->map, LTDC_IER,
+			   IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE, 0);
+
+	ret = ltdc_get_caps(ltdc);
+	if (ret) {
+		DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
+			  ltdc->caps.hw_version);
+		return ret;
+	}
+
+	DRM_INFO("ltdc hw version 0x%08x - ready\n", ltdc->caps.hw_version);
+
+	platform_set_drvdata(pdev, ltdc);
+
+	ret = component_add(&pdev->dev, &ltdc_ops);
+	if (ret) {
+		DRM_ERROR("Cannot add component\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ltdc_remove(struct platform_device *pdev)
+{
+	DRM_DEBUG_DRIVER("\n");
+	component_del(&pdev->dev, &ltdc_ops);
+
+	return 0;
+}
+
+static const struct of_device_id ltdc_of_match[] = {
+	{ .compatible = "st,ltdc" },
+	{ /* end node */ }
+};
+MODULE_DEVICE_TABLE(of, ltdc_of_match);
+
+struct platform_driver ltdc_driver = {
+	.driver = {
+		.name = "st-ltdc",
+		.of_match_table = ltdc_of_match,
+	},
+	.probe = ltdc_probe,
+	.remove = ltdc_remove,
+};
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/st/ltdc.h b/drivers/gpu/drm/st/ltdc.h
new file mode 100644
index 0000000..f99142c
--- /dev/null
+++ b/drivers/gpu/drm/st/ltdc.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ *          Yannick Fertre <yannick.fertre@st.com>
+ *          Fabien Dessenne <fabien.dessenne@st.com>
+ *          Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _LTDC_H_
+#define _LTDC_H_
+
+#include <drm/drmP.h>
+
+int ltdc_crtc_enable_vblank(struct drm_device *dev, unsigned int pipe);
+void ltdc_crtc_disable_vblank(struct drm_device *dev, unsigned int pipe);
+
+#endif
-- 
1.9.1

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[PATCH v1 3/7] dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 .../bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt         | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt

diff --git a/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
new file mode 100644
index 0000000..f59e3c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
@@ -0,0 +1,7 @@
+Ampire AM-480272H3TMQW-T01H 4.3" WQVGA TFT LCD panel
+
+Required properties:
+- compatible: should be "ampire,am-480272h3tmqw-t01h"
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.
-- 
1.9.1

[PATCH v1 3/7] dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 .../bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt         | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt

diff --git a/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
new file mode 100644
index 0000000..f59e3c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
@@ -0,0 +1,7 @@
+Ampire AM-480272H3TMQW-T01H 4.3" WQVGA TFT LCD panel
+
+Required properties:
+- compatible: should be "ampire,am-480272h3tmqw-t01h"
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.
-- 
1.9.1

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[PATCH v1 3/7] dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel

[Rob Herring]

On Mon, Jan 16, 2017 at 02:29:00PM +0100, Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---
>  .../bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt         | 7 +++++++
>  1 file changed, 7 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
> new file mode 100644
> index 0000000..f59e3c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
> @@ -0,0 +1,7 @@
> +Ampire AM-480272H3TMQW-T01H 4.3" WQVGA TFT LCD panel
> +
> +Required properties:
> +- compatible: should be "ampire,am-480272h3tmqw-t01h"

No GPIOs or power supply?

> +
> +This binding is compatible with the simple-panel binding, which is specified
> +in simple-panel.txt in this directory.
> -- 
> 1.9.1
> 

Re: [PATCH v1 3/7] dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel

[Rob Herring]

On Mon, Jan 16, 2017 at 02:29:00PM +0100, Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---
>  .../bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt         | 7 +++++++
>  1 file changed, 7 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
> new file mode 100644
> index 0000000..f59e3c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
> @@ -0,0 +1,7 @@
> +Ampire AM-480272H3TMQW-T01H 4.3" WQVGA TFT LCD panel
> +
> +Required properties:
> +- compatible: should be "ampire,am-480272h3tmqw-t01h"

No GPIOs or power supply?

> +
> +This binding is compatible with the simple-panel binding, which is specified
> +in simple-panel.txt in this directory.
> -- 
> 1.9.1
> 
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[PATCH v1 4/7] drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H

[Yannick Fertre]

Add simple-panel support for the Ampire AM-480272H3TMQW-T01H,
which is a 4.3" WQVGA panel.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 06aaf79..ee5d2ff 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -386,6 +386,32 @@ static void panel_simple_shutdown(struct device *dev)
 	panel_simple_disable(&panel->base);
 }
 
+static const struct drm_display_mode ampire_am_480272h3tmqw_t01h_mode = {
+	.clock = 9000,
+	.hdisplay = 480,
+	.hsync_start = 480 + 2,
+	.hsync_end = 480 + 2 + 41,
+	.htotal = 480 + 2 + 41 + 2,
+	.vdisplay = 272,
+	.vsync_start = 272 + 2,
+	.vsync_end = 272 + 2 + 10,
+	.vtotal = 272 + 2 + 10 + 2,
+	.vrefresh = 60,
+	.flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
+};
+
+static const struct panel_desc ampire_am_480272h3tmqw_t01h = {
+	.modes = &ampire_am_480272h3tmqw_t01h_mode,
+	.num_modes = 1,
+	.bpc = 8,
+
+	.size = {
+		.width = 105,
+		.height = 67,
+	},
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+};
+
 static const struct drm_display_mode ampire_am800480r3tmqwa1h_mode = {
 	.clock = 33333,
 	.hdisplay = 800,
@@ -1715,6 +1741,9 @@ static void panel_simple_shutdown(struct device *dev)
 
 static const struct of_device_id platform_of_match[] = {
 	{
+		.compatible = "ampire,am-480272h3tmqw-t01h",
+		.data = &ampire_am_480272h3tmqw_t01h,
+	}, {
 		.compatible = "ampire,am800480r3tmqwa1h",
 		.data = &ampire_am800480r3tmqwa1h,
 	}, {
-- 
1.9.1

[PATCH v1 4/7] drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H

[Yannick Fertre]

Add simple-panel support for the Ampire AM-480272H3TMQW-T01H,
which is a 4.3" WQVGA panel.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 06aaf79..ee5d2ff 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -386,6 +386,32 @@ static void panel_simple_shutdown(struct device *dev)
 	panel_simple_disable(&panel->base);
 }
 
+static const struct drm_display_mode ampire_am_480272h3tmqw_t01h_mode = {
+	.clock = 9000,
+	.hdisplay = 480,
+	.hsync_start = 480 + 2,
+	.hsync_end = 480 + 2 + 41,
+	.htotal = 480 + 2 + 41 + 2,
+	.vdisplay = 272,
+	.vsync_start = 272 + 2,
+	.vsync_end = 272 + 2 + 10,
+	.vtotal = 272 + 2 + 10 + 2,
+	.vrefresh = 60,
+	.flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
+};
+
+static const struct panel_desc ampire_am_480272h3tmqw_t01h = {
+	.modes = &ampire_am_480272h3tmqw_t01h_mode,
+	.num_modes = 1,
+	.bpc = 8,
+
+	.size = {
+		.width = 105,
+		.height = 67,
+	},
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+};
+
 static const struct drm_display_mode ampire_am800480r3tmqwa1h_mode = {
 	.clock = 33333,
 	.hdisplay = 800,
@@ -1715,6 +1741,9 @@ static void panel_simple_shutdown(struct device *dev)
 
 static const struct of_device_id platform_of_match[] = {
 	{
+		.compatible = "ampire,am-480272h3tmqw-t01h",
+		.data = &ampire_am_480272h3tmqw_t01h,
+	}, {
 		.compatible = "ampire,am800480r3tmqwa1h",
 		.data = &ampire_am800480r3tmqwa1h,
 	}, {
-- 
1.9.1

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[PATCH v1 5/7] ARM: dts: stm32f429: Add ltdc support

[Yannick Fertre]

Add LTDC (Lcd-tft Display Controller) support.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 arch/arm/boot/dts/stm32f429.dtsi | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index 336ee4f..fc43415 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -185,7 +185,7 @@
 			interrupts = <1>, <2>, <3>, <6>, <7>, <8>, <9>, <10>, <23>, <40>, <41>, <42>, <62>, <76>;
 		};
 
-		pin-controller {
+		pinctrl: pin-controller {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "st,stm32f429-pinctrl";
@@ -404,6 +404,29 @@
 			interrupts = <80>;
 			clocks = <&rcc 0 38>;
 		};
+
+		st-display-subsystem {
+			compatible = "st,display-subsystem";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+			dma-ranges;
+
+			ltdc_host: stm32-ltdc at 40016800 {
+				compatible = "st,ltdc";
+				reg = <0x40016800 0x200>;
+				interrupts = <88>, <89>;
+				resets = <&rcc 314>;
+				clocks = <&rcc 1 8>;
+				clock-names = "clk-lcd";
+				status = "disabled";
+
+				port {
+					ltdc_out_rgb: endpoint {
+					};
+				};
+			};
+		};
 	};
 };
 
-- 
1.9.1

[PATCH v1 5/7] ARM: dts: stm32f429: Add ltdc support

[Yannick Fertre]

Add LTDC (Lcd-tft Display Controller) support.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 arch/arm/boot/dts/stm32f429.dtsi | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index 336ee4f..fc43415 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -185,7 +185,7 @@
 			interrupts = <1>, <2>, <3>, <6>, <7>, <8>, <9>, <10>, <23>, <40>, <41>, <42>, <62>, <76>;
 		};
 
-		pin-controller {
+		pinctrl: pin-controller {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "st,stm32f429-pinctrl";
@@ -404,6 +404,29 @@
 			interrupts = <80>;
 			clocks = <&rcc 0 38>;
 		};
+
+		st-display-subsystem {
+			compatible = "st,display-subsystem";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+			dma-ranges;
+
+			ltdc_host: stm32-ltdc@40016800 {
+				compatible = "st,ltdc";
+				reg = <0x40016800 0x200>;
+				interrupts = <88>, <89>;
+				resets = <&rcc 314>;
+				clocks = <&rcc 1 8>;
+				clock-names = "clk-lcd";
+				status = "disabled";
+
+				port {
+					ltdc_out_rgb: endpoint {
+					};
+				};
+			};
+		};
 	};
 };
 
-- 
1.9.1

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[PATCH v1 5/7] ARM: dts: stm32f429: Add ltdc support

[Alexandre Torgue]

Hi,

On 01/16/2017 02:29 PM, Yannick Fertre wrote:
> Add LTDC (Lcd-tft Display Controller) support.
>
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>

Can you change commit header by: "ARM: dts: stm32: Add ltdc support on 
stm32f429 MCU" please

> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 25 ++++++++++++++++++++++++-
>  1 file changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
> index 336ee4f..fc43415 100644
> --- a/arch/arm/boot/dts/stm32f429.dtsi
> +++ b/arch/arm/boot/dts/stm32f429.dtsi
> @@ -185,7 +185,7 @@
>  			interrupts = <1>, <2>, <3>, <6>, <7>, <8>, <9>, <10>, <23>, <40>, <41>, <42>, <62>, <76>;
>  		};
>
> -		pin-controller {
> +		pinctrl: pin-controller {
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			compatible = "st,stm32f429-pinctrl";
> @@ -404,6 +404,29 @@
>  			interrupts = <80>;
>  			clocks = <&rcc 0 38>;
>  		};
> +
> +		st-display-subsystem {
> +			compatible = "st,display-subsystem";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			dma-ranges;
> +
> +			ltdc_host: stm32-ltdc at 40016800 {
> +				compatible = "st,ltdc";
> +				reg = <0x40016800 0x200>;
> +				interrupts = <88>, <89>;
> +				resets = <&rcc 314>;
> +				clocks = <&rcc 1 8>;
> +				clock-names = "clk-lcd";
> +				status = "disabled";
> +
> +				port {
> +					ltdc_out_rgb: endpoint {
> +					};
> +				};
> +			};
> +		};
>  	};
>  };
>
>

Re: [PATCH v1 5/7] ARM: dts: stm32f429: Add ltdc support

[Alexandre Torgue]

Hi,

On 01/16/2017 02:29 PM, Yannick Fertre wrote:
> Add LTDC (Lcd-tft Display Controller) support.
>
> Signed-off-by: Yannick Fertre <yannick.fertre-qxv4g6HH51o@public.gmane.org>

Can you change commit header by: "ARM: dts: stm32: Add ltdc support on 
stm32f429 MCU" please

> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 25 ++++++++++++++++++++++++-
>  1 file changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
> index 336ee4f..fc43415 100644
> --- a/arch/arm/boot/dts/stm32f429.dtsi
> +++ b/arch/arm/boot/dts/stm32f429.dtsi
> @@ -185,7 +185,7 @@
>  			interrupts = <1>, <2>, <3>, <6>, <7>, <8>, <9>, <10>, <23>, <40>, <41>, <42>, <62>, <76>;
>  		};
>
> -		pin-controller {
> +		pinctrl: pin-controller {
>  			#address-cells = <1>;
>  			#size-cells = <1>;
>  			compatible = "st,stm32f429-pinctrl";
> @@ -404,6 +404,29 @@
>  			interrupts = <80>;
>  			clocks = <&rcc 0 38>;
>  		};
> +
> +		st-display-subsystem {
> +			compatible = "st,display-subsystem";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			dma-ranges;
> +
> +			ltdc_host: stm32-ltdc@40016800 {
> +				compatible = "st,ltdc";
> +				reg = <0x40016800 0x200>;
> +				interrupts = <88>, <89>;
> +				resets = <&rcc 314>;
> +				clocks = <&rcc 1 8>;
> +				clock-names = "clk-lcd";
> +				status = "disabled";
> +
> +				port {
> +					ltdc_out_rgb: endpoint {
> +					};
> +				};
> +			};
> +		};
>  	};
>  };
>
>
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[PATCH v1 6/7] ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board

[Yannick Fertre]

Enable ltdc & enable am-480272h3tmqw-t01h panel.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 arch/arm/boot/dts/stm32429i-eval.dts | 58 ++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
index 2de6487..f987ca5 100644
--- a/arch/arm/boot/dts/stm32429i-eval.dts
+++ b/arch/arm/boot/dts/stm32429i-eval.dts
@@ -88,6 +88,52 @@
 		clocks = <&rcc 0 30>;
 		clock-names = "main_clk";
 	};
+
+	panel_rgb: panel-rgb {
+		compatible = "ampire,am-480272h3tmqw-t01h";
+		status = "okay";
+		port {
+			panel_in_rgb: endpoint {
+				remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
+};
+
+&pinctrl {
+	pinctrl_ltdc: ltdc at 0 {
+		pins {
+			pinmux = <STM32F429_PI12_FUNC_LCD_HSYNC>,
+				 <STM32F429_PI13_FUNC_LCD_VSYNC>,
+				 <STM32F429_PI14_FUNC_LCD_CLK>,
+				 <STM32F429_PI15_FUNC_LCD_R0>,
+				 <STM32F429_PJ0_FUNC_LCD_R1>,
+				 <STM32F429_PJ1_FUNC_LCD_R2>,
+				 <STM32F429_PJ2_FUNC_LCD_R3>,
+				 <STM32F429_PJ3_FUNC_LCD_R4>,
+				 <STM32F429_PJ4_FUNC_LCD_R5>,
+				 <STM32F429_PJ5_FUNC_LCD_R6>,
+				 <STM32F429_PJ6_FUNC_LCD_R7>,
+				 <STM32F429_PJ7_FUNC_LCD_G0>,
+				 <STM32F429_PJ8_FUNC_LCD_G1>,
+				 <STM32F429_PJ9_FUNC_LCD_G2>,
+				 <STM32F429_PJ10_FUNC_LCD_G3>,
+				 <STM32F429_PJ11_FUNC_LCD_G4>,
+				 <STM32F429_PJ12_FUNC_LCD_B0>,
+				 <STM32F429_PJ13_FUNC_LCD_B1>,
+				 <STM32F429_PJ14_FUNC_LCD_B2>,
+				 <STM32F429_PJ15_FUNC_LCD_B3>,
+				 <STM32F429_PK0_FUNC_LCD_G5>,
+				 <STM32F429_PK1_FUNC_LCD_G6>,
+				 <STM32F429_PK2_FUNC_LCD_G7>,
+				 <STM32F429_PK3_FUNC_LCD_B4>,
+				 <STM32F429_PK4_FUNC_LCD_B5>,
+				 <STM32F429_PK5_FUNC_LCD_B6>,
+				 <STM32F429_PK6_FUNC_LCD_B7>,
+				 <STM32F429_PK7_FUNC_LCD_DE>;
+			slew-rate = <2>;
+		};
+	};
 };
 
 &clk_hse {
@@ -123,3 +169,15 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&ltdc_host{
+	status = "okay";
+	pinctrl-0 = <&pinctrl_ltdc>;
+	pinctrl-names = "default";
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
+};
-- 
1.9.1

[PATCH v1 6/7] ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board

[Yannick Fertre]

Enable ltdc & enable am-480272h3tmqw-t01h panel.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 arch/arm/boot/dts/stm32429i-eval.dts | 58 ++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
index 2de6487..f987ca5 100644
--- a/arch/arm/boot/dts/stm32429i-eval.dts
+++ b/arch/arm/boot/dts/stm32429i-eval.dts
@@ -88,6 +88,52 @@
 		clocks = <&rcc 0 30>;
 		clock-names = "main_clk";
 	};
+
+	panel_rgb: panel-rgb {
+		compatible = "ampire,am-480272h3tmqw-t01h";
+		status = "okay";
+		port {
+			panel_in_rgb: endpoint {
+				remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
+};
+
+&pinctrl {
+	pinctrl_ltdc: ltdc@0 {
+		pins {
+			pinmux = <STM32F429_PI12_FUNC_LCD_HSYNC>,
+				 <STM32F429_PI13_FUNC_LCD_VSYNC>,
+				 <STM32F429_PI14_FUNC_LCD_CLK>,
+				 <STM32F429_PI15_FUNC_LCD_R0>,
+				 <STM32F429_PJ0_FUNC_LCD_R1>,
+				 <STM32F429_PJ1_FUNC_LCD_R2>,
+				 <STM32F429_PJ2_FUNC_LCD_R3>,
+				 <STM32F429_PJ3_FUNC_LCD_R4>,
+				 <STM32F429_PJ4_FUNC_LCD_R5>,
+				 <STM32F429_PJ5_FUNC_LCD_R6>,
+				 <STM32F429_PJ6_FUNC_LCD_R7>,
+				 <STM32F429_PJ7_FUNC_LCD_G0>,
+				 <STM32F429_PJ8_FUNC_LCD_G1>,
+				 <STM32F429_PJ9_FUNC_LCD_G2>,
+				 <STM32F429_PJ10_FUNC_LCD_G3>,
+				 <STM32F429_PJ11_FUNC_LCD_G4>,
+				 <STM32F429_PJ12_FUNC_LCD_B0>,
+				 <STM32F429_PJ13_FUNC_LCD_B1>,
+				 <STM32F429_PJ14_FUNC_LCD_B2>,
+				 <STM32F429_PJ15_FUNC_LCD_B3>,
+				 <STM32F429_PK0_FUNC_LCD_G5>,
+				 <STM32F429_PK1_FUNC_LCD_G6>,
+				 <STM32F429_PK2_FUNC_LCD_G7>,
+				 <STM32F429_PK3_FUNC_LCD_B4>,
+				 <STM32F429_PK4_FUNC_LCD_B5>,
+				 <STM32F429_PK5_FUNC_LCD_B6>,
+				 <STM32F429_PK6_FUNC_LCD_B7>,
+				 <STM32F429_PK7_FUNC_LCD_DE>;
+			slew-rate = <2>;
+		};
+	};
 };
 
 &clk_hse {
@@ -123,3 +169,15 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&ltdc_host{
+	status = "okay";
+	pinctrl-0 = <&pinctrl_ltdc>;
+	pinctrl-names = "default";
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
+};
-- 
1.9.1

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[PATCH v1 6/7] ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board

[Alexandre Torgue]

Hi

On 01/16/2017 02:29 PM, Yannick Fertre wrote:
> Enable ltdc & enable am-480272h3tmqw-t01h panel.
>
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---

Can you please change commit header with:

"ARM: dts: stm32: Enable ltdc & simple panel on stm32f429-Eval board"

>  arch/arm/boot/dts/stm32429i-eval.dts | 58 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 58 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
> index 2de6487..f987ca5 100644
> --- a/arch/arm/boot/dts/stm32429i-eval.dts
> +++ b/arch/arm/boot/dts/stm32429i-eval.dts
> @@ -88,6 +88,52 @@
>  		clocks = <&rcc 0 30>;
>  		clock-names = "main_clk";
>  	};
> +
> +	panel_rgb: panel-rgb {
> +		compatible = "ampire,am-480272h3tmqw-t01h";
> +		status = "okay";
> +		port {
> +			panel_in_rgb: endpoint {
> +				remote-endpoint = <&ltdc_out_rgb>;
> +			};
> +		};
> +	};
> +};
> +
> +&pinctrl {
> +	pinctrl_ltdc: ltdc at 0 {
> +		pins {

Pinmuxing definition is SOC specific. Please move it in stm32f429.dtsi 
file. Note that a development is ongoing to define pinmuxing in a 
dedicated pinctrl-stm32f4.dtsi file.


> +			pinmux = <STM32F429_PI12_FUNC_LCD_HSYNC>,
> +				 <STM32F429_PI13_FUNC_LCD_VSYNC>,
> +				 <STM32F429_PI14_FUNC_LCD_CLK>,
> +				 <STM32F429_PI15_FUNC_LCD_R0>,
> +				 <STM32F429_PJ0_FUNC_LCD_R1>,
> +				 <STM32F429_PJ1_FUNC_LCD_R2>,
> +				 <STM32F429_PJ2_FUNC_LCD_R3>,
> +				 <STM32F429_PJ3_FUNC_LCD_R4>,
> +				 <STM32F429_PJ4_FUNC_LCD_R5>,
> +				 <STM32F429_PJ5_FUNC_LCD_R6>,
> +				 <STM32F429_PJ6_FUNC_LCD_R7>,
> +				 <STM32F429_PJ7_FUNC_LCD_G0>,
> +				 <STM32F429_PJ8_FUNC_LCD_G1>,
> +				 <STM32F429_PJ9_FUNC_LCD_G2>,
> +				 <STM32F429_PJ10_FUNC_LCD_G3>,
> +				 <STM32F429_PJ11_FUNC_LCD_G4>,
> +				 <STM32F429_PJ12_FUNC_LCD_B0>,
> +				 <STM32F429_PJ13_FUNC_LCD_B1>,
> +				 <STM32F429_PJ14_FUNC_LCD_B2>,
> +				 <STM32F429_PJ15_FUNC_LCD_B3>,
> +				 <STM32F429_PK0_FUNC_LCD_G5>,
> +				 <STM32F429_PK1_FUNC_LCD_G6>,
> +				 <STM32F429_PK2_FUNC_LCD_G7>,
> +				 <STM32F429_PK3_FUNC_LCD_B4>,
> +				 <STM32F429_PK4_FUNC_LCD_B5>,
> +				 <STM32F429_PK5_FUNC_LCD_B6>,
> +				 <STM32F429_PK6_FUNC_LCD_B7>,
> +				 <STM32F429_PK7_FUNC_LCD_DE>;
> +			slew-rate = <2>;
> +		};
> +	};
>  };
>
>  &clk_hse {
> @@ -123,3 +169,15 @@
>  	pinctrl-names = "default";
>  	status = "okay";
>  };
> +
> +&ltdc_host{
> +	status = "okay";
> +	pinctrl-0 = <&pinctrl_ltdc>;
> +	pinctrl-names = "default";
> +
> +	port {
> +		ltdc_out_rgb: endpoint {
> +			remote-endpoint = <&panel_in_rgb>;
> +		};
> +	};
> +};
>

Re: [PATCH v1 6/7] ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board

[Alexandre Torgue]

Hi

On 01/16/2017 02:29 PM, Yannick Fertre wrote:
> Enable ltdc & enable am-480272h3tmqw-t01h panel.
>
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---

Can you please change commit header with:

"ARM: dts: stm32: Enable ltdc & simple panel on stm32f429-Eval board"

>  arch/arm/boot/dts/stm32429i-eval.dts | 58 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 58 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
> index 2de6487..f987ca5 100644
> --- a/arch/arm/boot/dts/stm32429i-eval.dts
> +++ b/arch/arm/boot/dts/stm32429i-eval.dts
> @@ -88,6 +88,52 @@
>  		clocks = <&rcc 0 30>;
>  		clock-names = "main_clk";
>  	};
> +
> +	panel_rgb: panel-rgb {
> +		compatible = "ampire,am-480272h3tmqw-t01h";
> +		status = "okay";
> +		port {
> +			panel_in_rgb: endpoint {
> +				remote-endpoint = <&ltdc_out_rgb>;
> +			};
> +		};
> +	};
> +};
> +
> +&pinctrl {
> +	pinctrl_ltdc: ltdc@0 {
> +		pins {

Pinmuxing definition is SOC specific. Please move it in stm32f429.dtsi 
file. Note that a development is ongoing to define pinmuxing in a 
dedicated pinctrl-stm32f4.dtsi file.


> +			pinmux = <STM32F429_PI12_FUNC_LCD_HSYNC>,
> +				 <STM32F429_PI13_FUNC_LCD_VSYNC>,
> +				 <STM32F429_PI14_FUNC_LCD_CLK>,
> +				 <STM32F429_PI15_FUNC_LCD_R0>,
> +				 <STM32F429_PJ0_FUNC_LCD_R1>,
> +				 <STM32F429_PJ1_FUNC_LCD_R2>,
> +				 <STM32F429_PJ2_FUNC_LCD_R3>,
> +				 <STM32F429_PJ3_FUNC_LCD_R4>,
> +				 <STM32F429_PJ4_FUNC_LCD_R5>,
> +				 <STM32F429_PJ5_FUNC_LCD_R6>,
> +				 <STM32F429_PJ6_FUNC_LCD_R7>,
> +				 <STM32F429_PJ7_FUNC_LCD_G0>,
> +				 <STM32F429_PJ8_FUNC_LCD_G1>,
> +				 <STM32F429_PJ9_FUNC_LCD_G2>,
> +				 <STM32F429_PJ10_FUNC_LCD_G3>,
> +				 <STM32F429_PJ11_FUNC_LCD_G4>,
> +				 <STM32F429_PJ12_FUNC_LCD_B0>,
> +				 <STM32F429_PJ13_FUNC_LCD_B1>,
> +				 <STM32F429_PJ14_FUNC_LCD_B2>,
> +				 <STM32F429_PJ15_FUNC_LCD_B3>,
> +				 <STM32F429_PK0_FUNC_LCD_G5>,
> +				 <STM32F429_PK1_FUNC_LCD_G6>,
> +				 <STM32F429_PK2_FUNC_LCD_G7>,
> +				 <STM32F429_PK3_FUNC_LCD_B4>,
> +				 <STM32F429_PK4_FUNC_LCD_B5>,
> +				 <STM32F429_PK5_FUNC_LCD_B6>,
> +				 <STM32F429_PK6_FUNC_LCD_B7>,
> +				 <STM32F429_PK7_FUNC_LCD_DE>;
> +			slew-rate = <2>;
> +		};
> +	};
>  };
>
>  &clk_hse {
> @@ -123,3 +169,15 @@
>  	pinctrl-names = "default";
>  	status = "okay";
>  };
> +
> +&ltdc_host{
> +	status = "okay";
> +	pinctrl-0 = <&pinctrl_ltdc>;
> +	pinctrl-names = "default";
> +
> +	port {
> +		ltdc_out_rgb: endpoint {
> +			remote-endpoint = <&panel_in_rgb>;
> +		};
> +	};
> +};
>

[PATCH v1 7/7] ARM: configs: Add STM32 LTDC support in STM32 defconfig

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 arch/arm/configs/stm32_defconfig | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
index 29068f5..e3974d9 100644
--- a/arch/arm/configs/stm32_defconfig
+++ b/arch/arm/configs/stm32_defconfig
@@ -71,3 +71,8 @@ CONFIG_MAGIC_SYSRQ=y
 # CONFIG_FTRACE is not set
 CONFIG_CRC_ITU_T=y
 CONFIG_CRC7=y
+CONFIG_DRM=y
+CONFIG_DRM_ST=y
+CONFIG_DRM_PANEL=y
+CONFIG_DRM_PANEL_SIMPLE=y
+CONFIG_BACKLIGHT_LCD_SUPPORT=y
-- 
1.9.1

[PATCH v1 7/7] ARM: configs: Add STM32 LTDC support in STM32 defconfig

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 arch/arm/configs/stm32_defconfig | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
index 29068f5..e3974d9 100644
--- a/arch/arm/configs/stm32_defconfig
+++ b/arch/arm/configs/stm32_defconfig
@@ -71,3 +71,8 @@ CONFIG_MAGIC_SYSRQ=y
 # CONFIG_FTRACE is not set
 CONFIG_CRC_ITU_T=y
 CONFIG_CRC7=y
+CONFIG_DRM=y
+CONFIG_DRM_ST=y
+CONFIG_DRM_PANEL=y
+CONFIG_DRM_PANEL_SIMPLE=y
+CONFIG_BACKLIGHT_LCD_SUPPORT=y
-- 
1.9.1

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[PATCH v1 7/7] ARM: configs: Add STM32 LTDC support in STM32 defconfig

[Alexandre Torgue]

Hi

On 01/16/2017 02:29 PM, Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---

commit header "ARM: configs: stm32: ADD LDTC support"

>  arch/arm/configs/stm32_defconfig | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
> index 29068f5..e3974d9 100644
> --- a/arch/arm/configs/stm32_defconfig
> +++ b/arch/arm/configs/stm32_defconfig
> @@ -71,3 +71,8 @@ CONFIG_MAGIC_SYSRQ=y
>  # CONFIG_FTRACE is not set
>  CONFIG_CRC_ITU_T=y
>  CONFIG_CRC7=y
> +CONFIG_DRM=y
> +CONFIG_DRM_ST=y
> +CONFIG_DRM_PANEL=y
> +CONFIG_DRM_PANEL_SIMPLE=y
> +CONFIG_BACKLIGHT_LCD_SUPPORT=y
>

Re: [PATCH v1 7/7] ARM: configs: Add STM32 LTDC support in STM32 defconfig

[Alexandre Torgue]

Hi

On 01/16/2017 02:29 PM, Yannick Fertre wrote:
> Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
> ---

commit header "ARM: configs: stm32: ADD LDTC support"

>  arch/arm/configs/stm32_defconfig | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
> index 29068f5..e3974d9 100644
> --- a/arch/arm/configs/stm32_defconfig
> +++ b/arch/arm/configs/stm32_defconfig
> @@ -71,3 +71,8 @@ CONFIG_MAGIC_SYSRQ=y
>  # CONFIG_FTRACE is not set
>  CONFIG_CRC_ITU_T=y
>  CONFIG_CRC7=y
> +CONFIG_DRM=y
> +CONFIG_DRM_ST=y
> +CONFIG_DRM_PANEL=y
> +CONFIG_DRM_PANEL_SIMPLE=y
> +CONFIG_BACKLIGHT_LCD_SUPPORT=y
>

[PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Neil Armstrong]

On 01/16/2017 02:28 PM, Yannick Fertre wrote:
> The purpose of this set of patches is to add a new driver for stm32f429.
> This driver was developed and tested on evaluation board stm32429i.
> 
> Stm32f4 is a MCU platform which don't have MMU so the last patches developed
> by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
> are necessary.
> 
> The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
> A new simple panel am-480272h3tmqw-t01h have been added to support it.
> 
> Yannick Fertre (7):
>   dt-bindings: display: add STM32 LTDC driver
>   drm/st: Add STM32 LTDC driver
>   dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
>   drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
>   ARM: dts: stm32f429: Add ltdc support
>   ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
>   ARM: configs: Add STM32 LTDC support in STM32 defconfig
> 
>  .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
>  .../devicetree/bindings/display/st,ltdc.txt        |   57 +
>  arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
>  arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
>  arch/arm/configs/stm32_defconfig                   |    5 +
>  drivers/gpu/drm/Kconfig                            |    2 +
>  drivers/gpu/drm/Makefile                           |    1 +
>  drivers/gpu/drm/panel/panel-simple.c               |   29 +
>  drivers/gpu/drm/st/Kconfig                         |   14 +
>  drivers/gpu/drm/st/Makefile                        |    7 +
>  drivers/gpu/drm/st/drv.c                           |  279 ++++
>  drivers/gpu/drm/st/drv.h                           |   25 +
>  drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
>  drivers/gpu/drm/st/ltdc.h                          |   20 +
>  14 files changed, 1966 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
>  create mode 100644 drivers/gpu/drm/st/Kconfig
>  create mode 100644 drivers/gpu/drm/st/Makefile
>  create mode 100644 drivers/gpu/drm/st/drv.c
>  create mode 100644 drivers/gpu/drm/st/drv.h
>  create mode 100644 drivers/gpu/drm/st/ltdc.c
>  create mode 100644 drivers/gpu/drm/st/ltdc.h
> 

Hi Yannick,

Shouldn't be more logical to use stm32 for the driver instead of st ?
It would eventually collude with the other STMicroelectronics SoCs and
will be aligned with other drivers like stm32-rtc, stm32-i2c, ...

Neil

Re: [PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Neil Armstrong]

On 01/16/2017 02:28 PM, Yannick Fertre wrote:
> The purpose of this set of patches is to add a new driver for stm32f429.
> This driver was developed and tested on evaluation board stm32429i.
> 
> Stm32f4 is a MCU platform which don't have MMU so the last patches developed
> by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
> are necessary.
> 
> The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
> A new simple panel am-480272h3tmqw-t01h have been added to support it.
> 
> Yannick Fertre (7):
>   dt-bindings: display: add STM32 LTDC driver
>   drm/st: Add STM32 LTDC driver
>   dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
>   drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
>   ARM: dts: stm32f429: Add ltdc support
>   ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
>   ARM: configs: Add STM32 LTDC support in STM32 defconfig
> 
>  .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
>  .../devicetree/bindings/display/st,ltdc.txt        |   57 +
>  arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
>  arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
>  arch/arm/configs/stm32_defconfig                   |    5 +
>  drivers/gpu/drm/Kconfig                            |    2 +
>  drivers/gpu/drm/Makefile                           |    1 +
>  drivers/gpu/drm/panel/panel-simple.c               |   29 +
>  drivers/gpu/drm/st/Kconfig                         |   14 +
>  drivers/gpu/drm/st/Makefile                        |    7 +
>  drivers/gpu/drm/st/drv.c                           |  279 ++++
>  drivers/gpu/drm/st/drv.h                           |   25 +
>  drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
>  drivers/gpu/drm/st/ltdc.h                          |   20 +
>  14 files changed, 1966 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
>  create mode 100644 drivers/gpu/drm/st/Kconfig
>  create mode 100644 drivers/gpu/drm/st/Makefile
>  create mode 100644 drivers/gpu/drm/st/drv.c
>  create mode 100644 drivers/gpu/drm/st/drv.h
>  create mode 100644 drivers/gpu/drm/st/ltdc.c
>  create mode 100644 drivers/gpu/drm/st/ltdc.h
> 

Hi Yannick,

Shouldn't be more logical to use stm32 for the driver instead of st ?
It would eventually collude with the other STMicroelectronics SoCs and
will be aligned with other drivers like stm32-rtc, stm32-i2c, ...

Neil
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[PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Yannick FERTRE]

Hi Neil,
ST may use this hardware IP also in other SoC, even that is not true 
now, I hope that "st" is a more futur proof name.

Best regards

Yannick Fertr?


On 01/16/2017 05:02 PM, Neil Armstrong wrote:
> On 01/16/2017 02:28 PM, Yannick Fertre wrote:
>> The purpose of this set of patches is to add a new driver for stm32f429.
>> This driver was developed and tested on evaluation board stm32429i.
>>
>> Stm32f4 is a MCU platform which don't have MMU so the last patches developed
>> by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
>> are necessary.
>>
>> The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
>> A new simple panel am-480272h3tmqw-t01h have been added to support it.
>>
>> Yannick Fertre (7):
>>   dt-bindings: display: add STM32 LTDC driver
>>   drm/st: Add STM32 LTDC driver
>>   dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
>>   drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
>>   ARM: dts: stm32f429: Add ltdc support
>>   ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
>>   ARM: configs: Add STM32 LTDC support in STM32 defconfig
>>
>>  .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
>>  .../devicetree/bindings/display/st,ltdc.txt        |   57 +
>>  arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
>>  arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
>>  arch/arm/configs/stm32_defconfig                   |    5 +
>>  drivers/gpu/drm/Kconfig                            |    2 +
>>  drivers/gpu/drm/Makefile                           |    1 +
>>  drivers/gpu/drm/panel/panel-simple.c               |   29 +
>>  drivers/gpu/drm/st/Kconfig                         |   14 +
>>  drivers/gpu/drm/st/Makefile                        |    7 +
>>  drivers/gpu/drm/st/drv.c                           |  279 ++++
>>  drivers/gpu/drm/st/drv.h                           |   25 +
>>  drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
>>  drivers/gpu/drm/st/ltdc.h                          |   20 +
>>  14 files changed, 1966 insertions(+), 1 deletion(-)
>>  create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
>>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
>>  create mode 100644 drivers/gpu/drm/st/Kconfig
>>  create mode 100644 drivers/gpu/drm/st/Makefile
>>  create mode 100644 drivers/gpu/drm/st/drv.c
>>  create mode 100644 drivers/gpu/drm/st/drv.h
>>  create mode 100644 drivers/gpu/drm/st/ltdc.c
>>  create mode 100644 drivers/gpu/drm/st/ltdc.h
>>
>
> Hi Yannick,
>
> Shouldn't be more logical to use stm32 for the driver instead of st ?
> It would eventually collude with the other STMicroelectronics SoCs and
> will be aligned with other drivers like stm32-rtc, stm32-i2c, ...
>
> Neil
>

Re: [PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Yannick FERTRE]

Hi Neil,
ST may use this hardware IP also in other SoC, even that is not true 
now, I hope that "st" is a more futur proof name.

Best regards

Yannick Fertré


On 01/16/2017 05:02 PM, Neil Armstrong wrote:
> On 01/16/2017 02:28 PM, Yannick Fertre wrote:
>> The purpose of this set of patches is to add a new driver for stm32f429.
>> This driver was developed and tested on evaluation board stm32429i.
>>
>> Stm32f4 is a MCU platform which don't have MMU so the last patches developed
>> by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
>> are necessary.
>>
>> The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
>> A new simple panel am-480272h3tmqw-t01h have been added to support it.
>>
>> Yannick Fertre (7):
>>   dt-bindings: display: add STM32 LTDC driver
>>   drm/st: Add STM32 LTDC driver
>>   dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
>>   drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
>>   ARM: dts: stm32f429: Add ltdc support
>>   ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
>>   ARM: configs: Add STM32 LTDC support in STM32 defconfig
>>
>>  .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
>>  .../devicetree/bindings/display/st,ltdc.txt        |   57 +
>>  arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
>>  arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
>>  arch/arm/configs/stm32_defconfig                   |    5 +
>>  drivers/gpu/drm/Kconfig                            |    2 +
>>  drivers/gpu/drm/Makefile                           |    1 +
>>  drivers/gpu/drm/panel/panel-simple.c               |   29 +
>>  drivers/gpu/drm/st/Kconfig                         |   14 +
>>  drivers/gpu/drm/st/Makefile                        |    7 +
>>  drivers/gpu/drm/st/drv.c                           |  279 ++++
>>  drivers/gpu/drm/st/drv.h                           |   25 +
>>  drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
>>  drivers/gpu/drm/st/ltdc.h                          |   20 +
>>  14 files changed, 1966 insertions(+), 1 deletion(-)
>>  create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
>>  create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
>>  create mode 100644 drivers/gpu/drm/st/Kconfig
>>  create mode 100644 drivers/gpu/drm/st/Makefile
>>  create mode 100644 drivers/gpu/drm/st/drv.c
>>  create mode 100644 drivers/gpu/drm/st/drv.h
>>  create mode 100644 drivers/gpu/drm/st/ltdc.c
>>  create mode 100644 drivers/gpu/drm/st/ltdc.h
>>
>
> Hi Yannick,
>
> Shouldn't be more logical to use stm32 for the driver instead of st ?
> It would eventually collude with the other STMicroelectronics SoCs and
> will be aligned with other drivers like stm32-rtc, stm32-i2c, ...
>
> Neil
>
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[PATCH v1 0/7] DRM: add LTDC support for STM32F4

[Yannick Fertre]

The purpose of this set of patches is to add a new driver for stm32f429.
This driver was developed and tested on evaluation board stm32429i.

Stm32f4 is a MCU platform which don't have MMU so the last patches developed
by Benjamin Gaignard regarding "DRM: allow to use mmuless devices"
are necessary.

The board stm429i embeds a Ampire AM-480272H3TMQW-T01H screen.
A new simple panel am-480272h3tmqw-t01h have been added to support it.

Yannick Fertre (7):
  dt-bindings: display: add STM32 LTDC driver
  drm/st: Add STM32 LTDC driver
  dt-bindings: Add Ampire AM-480272H3TMQW-T01H panel
  drm/panel: simple: Add support for Ampire AM-480272H3TMQW-T01H
  ARM: dts: stm32f429: Add ltdc support
  ARM: dts: stm32429i-eval: Enable ltdc & simple panel on Eval board
  ARM: configs: Add STM32 LTDC support in STM32 defconfig

 .../display/panel/ampire,am-480272h3tmqw-t01h.txt  |    7 +
 .../devicetree/bindings/display/st,ltdc.txt        |   57 +
 arch/arm/boot/dts/stm32429i-eval.dts               |   58 +
 arch/arm/boot/dts/stm32f429.dtsi                   |   25 +-
 arch/arm/configs/stm32_defconfig                   |    5 +
 drivers/gpu/drm/Kconfig                            |    2 +
 drivers/gpu/drm/Makefile                           |    1 +
 drivers/gpu/drm/panel/panel-simple.c               |   29 +
 drivers/gpu/drm/st/Kconfig                         |   14 +
 drivers/gpu/drm/st/Makefile                        |    7 +
 drivers/gpu/drm/st/drv.c                           |  279 ++++
 drivers/gpu/drm/st/drv.h                           |   25 +
 drivers/gpu/drm/st/ltdc.c                          | 1438 ++++++++++++++++++++
 drivers/gpu/drm/st/ltdc.h                          |   20 +
 14 files changed, 1966 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ampire,am-480272h3tmqw-t01h.txt
 create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt
 create mode 100644 drivers/gpu/drm/st/Kconfig
 create mode 100644 drivers/gpu/drm/st/Makefile
 create mode 100644 drivers/gpu/drm/st/drv.c
 create mode 100644 drivers/gpu/drm/st/drv.h
 create mode 100644 drivers/gpu/drm/st/ltdc.c
 create mode 100644 drivers/gpu/drm/st/ltdc.h

-- 
1.9.1

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[PATCH v1 1/7] dt-bindings: display: add STM32 LTDC driver

[Yannick Fertre]

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
---
 .../devicetree/bindings/display/st,ltdc.txt        | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/st,ltdc.txt

diff --git a/Documentation/devicetree/bindings/display/st,ltdc.txt b/Documentation/devicetree/bindings/display/st,ltdc.txt
new file mode 100644
index 0000000..20e89da
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/st,ltdc.txt
@@ -0,0 +1,57 @@
+* STMicroelectronics STM32 lcd-tft display controller
+
+- st-display-subsystem: Master device for DRM sub-components
+  This device must be the parent of all the sub-components and is responsible
+  of bind them.
+  Required properties:
+  - compatible: "st,display-subsystem"
+  - ranges: to allow probing of subdevices
+
+- ltdc_host: lcd-tft display controller host
+  must be a sub-node of st-display-subsystem
+  Required properties:
+  - compatible: "st,ltdc"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+  - resets: resets to be used by the device
+    See ../reset/reset.txt for details.
+  - reset-names: names of the resets listed in resets property in the same
+    order.
+  Required nodes:
+    - Video port for RGB output.
+
+Example:
+
+/ {
+	...
+	soc {
+	...
+		st-display-subsystem {
+			compatible = "st,display-subsystem";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges;
+			dma-ranges;
+
+			ltdc_host: stm32-ltdc@40016800 {
+				compatible = "st,ltdc";
+				reg = <0x40016800 0x200>;
+				interrupts = <88>, <89>;
+				resets = <&rcc 314>;
+				clocks = <&rcc 1 8>;
+				clock-names = "clk-lcd";
+				status = "disabled";
+
+				port {
+					ltdc_out_rgb: endpoint {
+					};
+				};
+			};
+		};
+	...
+	};
+};
-- 
1.9.1

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