[PATCH v5 0/3] Add display support on the stm32f746-disco board

[PATCH v5 0/3] Add display support on the stm32f746-disco board

[Dario Binacchi]

The series adds support for the display on the stm32f746-disco board.

Changes in v5:
I am confident that framebuffer sizing is a real requirement for STM32 boards,
but I need some time to understand if and how to introduce this functionality.
Therefore, I drop the following patches to allow the series to be fully merged:
 - [4/6] dt-bindings: display: stm32-ltdc: add optional st,fb-bpp property
 - [5/6] ARM: dts: stm32: set framebuffer bit depth on stm32f746-disco
 - [6/6] drm/stm: set framebuffer bit depth through DTS property

Changes in v4:
- Use DTS property instead of module parameter to set the framebuffer bit depth.

Changes in v3:
- rename ltdc-pins-a-0 to ltdc-0.
- drop [4/6] dt-bindings: display: simple: add Rocktech RK043FN48H
  Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next):
  https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c42a37a27c777d63961dd634a30f7c887949491a
- drop [5/6] drm/panel: simple: add support for Rocktech RK043FN48H panel
  Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)
  https://cgit.freedesktop.org/drm/drm-misc/commit/?id=13cdd12a9f934158f4ec817cf048fcb4384aa9dc

Dario Binacchi (3):
  ARM: dts: stm32: add ltdc support on stm32f746 MCU
  ARM: dts: stm32: add pin map for LTDC on stm32f7
  ARM: dts: stm32: support display on stm32f746-disco board

 arch/arm/boot/dts/stm32f7-pinctrl.dtsi | 35 ++++++++++++++++++
 arch/arm/boot/dts/stm32f746-disco.dts  | 51 ++++++++++++++++++++++++++
 arch/arm/boot/dts/stm32f746.dtsi       | 10 +++++
 3 files changed, 96 insertions(+)

-- 
2.32.0


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[PATCH v5 1/3] ARM: dts: stm32: add ltdc support on stm32f746 MCU

[Dario Binacchi]

Add LTDC (Lcd-tft Display Controller) support.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
---

(no changes since v1)

 arch/arm/boot/dts/stm32f746.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f746.dtsi b/arch/arm/boot/dts/stm32f746.dtsi
index dc868e6da40e..9c4ba0b7f239 100644
--- a/arch/arm/boot/dts/stm32f746.dtsi
+++ b/arch/arm/boot/dts/stm32f746.dtsi
@@ -507,6 +507,16 @@ pwm {
 			};
 		};
 
+		ltdc: display-controller@40016800 {
+			compatible = "st,stm32-ltdc";
+			reg = <0x40016800 0x200>;
+			interrupts = <88>, <89>;
+			resets = <&rcc STM32F7_APB2_RESET(LTDC)>;
+			clocks = <&rcc 1 CLK_LCD>;
+			clock-names = "lcd";
+			status = "disabled";
+		};
+
 		pwrcfg: power-config@40007000 {
 			compatible = "st,stm32-power-config", "syscon";
 			reg = <0x40007000 0x400>;
-- 
2.32.0


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Re: [PATCH v5 1/3] ARM: dts: stm32: add ltdc support on stm32f746 MCU

[Raphael Gallais-Pou]

Hi,


On 6/29/23 10:37, Dario Binacchi wrote:
> Add LTDC (Lcd-tft Display Controller) support.
>
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> ---
>
> (no changes since v1)
>
>  arch/arm/boot/dts/stm32f746.dtsi | 10 ++++++++++
>  1 file changed, 10 insertions(+)

Reviewed-by: Raphaël Gallais-Pou <raphael.gallais-pou@foss.st.com>


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[PATCH v5 2/3] ARM: dts: stm32: add pin map for LTDC on stm32f7

[Dario Binacchi]

Add pin configurations for using LTDC (LCD-tft Display Controller) on
stm32f746-disco board.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

---

(no changes since v3)

Changes in v3:
- rename ltdc-pins-a-0 to ltdc-0.

 arch/arm/boot/dts/stm32f7-pinctrl.dtsi | 35 ++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f7-pinctrl.dtsi b/arch/arm/boot/dts/stm32f7-pinctrl.dtsi
index 9f65403295ca..36dad40dd0c7 100644
--- a/arch/arm/boot/dts/stm32f7-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32f7-pinctrl.dtsi
@@ -365,6 +365,41 @@ pins2 {
 					bias-pull-up;
 				};
 			};
+
+
+			ltdc_pins_a: ltdc-0 {
+				pins {
+					pinmux = <STM32_PINMUX('E', 4, AF14)>, /* LCD_B0 */
+						 <STM32_PINMUX('G',12, AF9)>,  /* LCD_B4 */
+						 <STM32_PINMUX('I', 9, AF14)>, /* LCD_VSYNC */
+						 <STM32_PINMUX('I',10, AF14)>, /* LCD_HSYNC */
+						 <STM32_PINMUX('I',14, AF14)>, /* LCD_CLK */
+						 <STM32_PINMUX('I',15, AF14)>, /* LCD_R0 */
+						 <STM32_PINMUX('J', 0, AF14)>, /* LCD_R1 */
+						 <STM32_PINMUX('J', 1, AF14)>, /* LCD_R2 */
+						 <STM32_PINMUX('J', 2, AF14)>, /* LCD_R3 */
+						 <STM32_PINMUX('J', 3, AF14)>, /* LCD_R4 */
+						 <STM32_PINMUX('J', 4, AF14)>, /* LCD_R5 */
+						 <STM32_PINMUX('J', 5, AF14)>, /* LCD_R6 */
+						 <STM32_PINMUX('J', 6, AF14)>, /* LCD_R7 */
+						 <STM32_PINMUX('J', 7, AF14)>, /* LCD_G0 */
+						 <STM32_PINMUX('J', 8, AF14)>, /* LCD_G1 */
+						 <STM32_PINMUX('J', 9, AF14)>, /* LCD_G2 */
+						 <STM32_PINMUX('J',10, AF14)>, /* LCD_G3 */
+						 <STM32_PINMUX('J',11, AF14)>, /* LCD_G4 */
+						 <STM32_PINMUX('J',13, AF14)>, /* LCD_B1 */
+						 <STM32_PINMUX('J',14, AF14)>, /* LCD_B2 */
+						 <STM32_PINMUX('J',15, AF14)>, /* LCD_B3 */
+						 <STM32_PINMUX('K', 0, AF14)>, /* LCD_G5 */
+						 <STM32_PINMUX('K', 1, AF14)>, /* LCD_G6 */
+						 <STM32_PINMUX('K', 2, AF14)>, /* LCD_G7 */
+						 <STM32_PINMUX('K', 4, AF14)>, /* LCD_B5 */
+						 <STM32_PINMUX('K', 5, AF14)>, /* LCD_B6 */
+						 <STM32_PINMUX('K', 6, AF14)>, /* LCD_B7 */
+						 <STM32_PINMUX('K', 7, AF14)>; /* LCD_DE */
+					slew-rate = <2>;
+				};
+			};
 		};
 	};
 };
-- 
2.32.0


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Re: [PATCH v5 2/3] ARM: dts: stm32: add pin map for LTDC on stm32f7

[Raphael Gallais-Pou]

Hi,

On 6/29/23 10:37, Dario Binacchi wrote:
> Add pin configurations for using LTDC (LCD-tft Display Controller) on
> stm32f746-disco board.
>
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
>
> ---
>
> (no changes since v3)
>
> Changes in v3:
> - rename ltdc-pins-a-0 to ltdc-0.
>
>  arch/arm/boot/dts/stm32f7-pinctrl.dtsi | 35 ++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)

Reviewed-by: Raphaël Gallais-Pou <raphael.gallais-pou@foss.st.com>


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[PATCH v5 3/3] ARM: dts: stm32: support display on stm32f746-disco board

[Dario Binacchi]

Add support to Rocktech RK043FN48H display on stm32f746-disco board.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

---

Changes in v5:
I am confident that framebuffer sizing is a real requirement for STM32 boards,
but I need some time to understand if and how to introduce this functionality.
Therefore, I drop the following patches to allow the series to be fully merged:
 - [4/6] dt-bindings: display: stm32-ltdc: add optional st,fb-bpp property
 - [5/6] ARM: dts: stm32: set framebuffer bit depth on stm32f746-disco
 - [6/6] drm/stm: set framebuffer bit depth through DTS property

Changes in v4:
- Use DTS property instead of module parameter to set the framebuffer bit depth.

Changes in v3:
- drop [4/6] dt-bindings: display: simple: add Rocktech RK043FN48H
  Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next):
  https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c42a37a27c777d63961dd634a30f7c887949491a
- drop [5/6] drm/panel: simple: add support for Rocktech RK043FN48H panel
  Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)
  https://cgit.freedesktop.org/drm/drm-misc/commit/?id=13cdd12a9f934158f4ec817cf048fcb4384aa9dc

 arch/arm/boot/dts/stm32f746-disco.dts | 51 +++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts
index c11616ed5fc6..cda423b6a874 100644
--- a/arch/arm/boot/dts/stm32f746-disco.dts
+++ b/arch/arm/boot/dts/stm32f746-disco.dts
@@ -60,10 +60,41 @@ memory@c0000000 {
 		reg = <0xC0000000 0x800000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,cma {
+			compatible = "shared-dma-pool";
+			no-map;
+			size = <0x80000>;
+			linux,dma-default;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
 
+	backlight: backlight {
+		compatible = "gpio-backlight";
+		gpios = <&gpiok 3 GPIO_ACTIVE_HIGH>;
+		status = "okay";
+	};
+
+	panel_rgb: panel-rgb {
+		compatible = "rocktech,rk043fn48h";
+		backlight = <&backlight>;
+		enable-gpios = <&gpioi 12 GPIO_ACTIVE_HIGH>;
+		status = "okay";
+		port {
+			panel_in_rgb: endpoint {
+				remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
+
 	usbotg_hs_phy: usb-phy {
 		#phy-cells = <0>;
 		compatible = "usb-nop-xceiv";
@@ -99,6 +130,26 @@ &i2c1 {
 	status = "okay";
 };
 
+&dma1 {
+	status = "okay";
+};
+
+&dma2 {
+	status = "okay";
+};
+
+&ltdc {
+	pinctrl-0 = <&ltdc_pins_a>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
+};
+
 &sdio1 {
 	status = "okay";
 	vmmc-supply = <&mmc_vcard>;
-- 
2.32.0


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Re: [PATCH v5 3/3] ARM: dts: stm32: support display on stm32f746-disco board

[Raphael Gallais-Pou]

Hi,

On 6/29/23 10:37, Dario Binacchi wrote:
> Add support to Rocktech RK043FN48H display on stm32f746-disco board.
>
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
>
> ---
>
> Changes in v5:
> I am confident that framebuffer sizing is a real requirement for STM32 boards,
> but I need some time to understand if and how to introduce this functionality.
> Therefore, I drop the following patches to allow the series to be fully merged:
>  - [4/6] dt-bindings: display: stm32-ltdc: add optional st,fb-bpp property
>  - [5/6] ARM: dts: stm32: set framebuffer bit depth on stm32f746-disco
>  - [6/6] drm/stm: set framebuffer bit depth through DTS property
>
> Changes in v4:
> - Use DTS property instead of module parameter to set the framebuffer bit depth.
>
> Changes in v3:
> - drop [4/6] dt-bindings: display: simple: add Rocktech RK043FN48H
>   Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next):
>   https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c42a37a27c777d63961dd634a30f7c887949491a
> - drop [5/6] drm/panel: simple: add support for Rocktech RK043FN48H panel
>   Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)
>   https://cgit.freedesktop.org/drm/drm-misc/commit/?id=13cdd12a9f934158f4ec817cf048fcb4384aa9dc
>
>  arch/arm/boot/dts/stm32f746-disco.dts | 51 +++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)


Reviewed-by: Raphaël Gallais-Pou <raphael.gallais-pou@foss.st.com>

Thanks,
Raphaël G.-P.


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Re: [PATCH v5 3/3] ARM: dts: stm32: support display on stm32f746-disco board

[Alexandre TORGUE]

Hi Dario

On 6/29/23 10:37, Dario Binacchi wrote:
> Add support to Rocktech RK043FN48H display on stm32f746-disco board.
> 
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> 
> ---
> 
> Changes in v5:
> I am confident that framebuffer sizing is a real requirement for STM32 boards,
> but I need some time to understand if and how to introduce this functionality.
> Therefore, I drop the following patches to allow the series to be fully merged:
>   - [4/6] dt-bindings: display: stm32-ltdc: add optional st,fb-bpp property
>   - [5/6] ARM: dts: stm32: set framebuffer bit depth on stm32f746-disco
>   - [6/6] drm/stm: set framebuffer bit depth through DTS property
> 
> Changes in v4:
> - Use DTS property instead of module parameter to set the framebuffer bit depth.
> 
> Changes in v3:
> - drop [4/6] dt-bindings: display: simple: add Rocktech RK043FN48H
>    Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next):
>    https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c42a37a27c777d63961dd634a30f7c887949491a
> - drop [5/6] drm/panel: simple: add support for Rocktech RK043FN48H panel
>    Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)
>    https://cgit.freedesktop.org/drm/drm-misc/commit/?id=13cdd12a9f934158f4ec817cf048fcb4384aa9dc
> 
>   arch/arm/boot/dts/stm32f746-disco.dts | 51 +++++++++++++++++++++++++++
>   1 file changed, 51 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts
> index c11616ed5fc6..cda423b6a874 100644
> --- a/arch/arm/boot/dts/stm32f746-disco.dts
> +++ b/arch/arm/boot/dts/stm32f746-disco.dts
> @@ -60,10 +60,41 @@ memory@c0000000 {
>   		reg = <0xC0000000 0x800000>;
>   	};
>   
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			no-map;
> +			size = <0x80000>;
> +			linux,dma-default;
> +		};
> +	};
> +
>   	aliases {
>   		serial0 = &usart1;
>   	};
>   
> +	backlight: backlight {
> +		compatible = "gpio-backlight";
> +		gpios = <&gpiok 3 GPIO_ACTIVE_HIGH>;
> +		status = "okay";
> +	};
> +
> +	panel_rgb: panel-rgb {
> +		compatible = "rocktech,rk043fn48h";
> +		backlight = <&backlight>;
> +		enable-gpios = <&gpioi 12 GPIO_ACTIVE_HIGH>;
> +		status = "okay";
> +		port {
> +			panel_in_rgb: endpoint {
> +				remote-endpoint = <&ltdc_out_rgb>;
> +			};
> +		};
> +	};
> +
>   	usbotg_hs_phy: usb-phy {
>   		#phy-cells = <0>;
>   		compatible = "usb-nop-xceiv";
> @@ -99,6 +130,26 @@ &i2c1 {
>   	status = "okay";
>   };
>   
> +&dma1 {
> +	status = "okay";
> +};
> +
> +&dma2 {
> +	status = "okay";
> 
Why do you enable DMAs ? It seems not used by LTDC.

> +&ltdc {
> +	pinctrl-0 = <&ltdc_pins_a>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +
> +	port {
> +		ltdc_out_rgb: endpoint {
> +			remote-endpoint = <&panel_in_rgb>;
> +		};
> +	};
> +};
> +
>   &sdio1 {
>   	status = "okay";
>   	vmmc-supply = <&mmc_vcard>;


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Re: [PATCH v5 3/3] ARM: dts: stm32: support display on stm32f746-disco board

[Dario Binacchi]

Hi Alexandre,

On Tue, Jul 11, 2023 at 2:13 PM Alexandre TORGUE
<alexandre.torgue@foss.st.com> wrote:
>
> Hi Dario
>
> On 6/29/23 10:37, Dario Binacchi wrote:
> > Add support to Rocktech RK043FN48H display on stm32f746-disco board.
> >
> > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> >
> > ---
> >
> > Changes in v5:
> > I am confident that framebuffer sizing is a real requirement for STM32 boards,
> > but I need some time to understand if and how to introduce this functionality.
> > Therefore, I drop the following patches to allow the series to be fully merged:
> >   - [4/6] dt-bindings: display: stm32-ltdc: add optional st,fb-bpp property
> >   - [5/6] ARM: dts: stm32: set framebuffer bit depth on stm32f746-disco
> >   - [6/6] drm/stm: set framebuffer bit depth through DTS property
> >
> > Changes in v4:
> > - Use DTS property instead of module parameter to set the framebuffer bit depth.
> >
> > Changes in v3:
> > - drop [4/6] dt-bindings: display: simple: add Rocktech RK043FN48H
> >    Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next):
> >    https://cgit.freedesktop.org/drm/drm-misc/commit/?id=c42a37a27c777d63961dd634a30f7c887949491a
> > - drop [5/6] drm/panel: simple: add support for Rocktech RK043FN48H panel
> >    Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next)
> >    https://cgit.freedesktop.org/drm/drm-misc/commit/?id=13cdd12a9f934158f4ec817cf048fcb4384aa9dc
> >
> >   arch/arm/boot/dts/stm32f746-disco.dts | 51 +++++++++++++++++++++++++++
> >   1 file changed, 51 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts
> > index c11616ed5fc6..cda423b6a874 100644
> > --- a/arch/arm/boot/dts/stm32f746-disco.dts
> > +++ b/arch/arm/boot/dts/stm32f746-disco.dts
> > @@ -60,10 +60,41 @@ memory@c0000000 {
> >               reg = <0xC0000000 0x800000>;
> >       };
> >
> > +     reserved-memory {
> > +             #address-cells = <1>;
> > +             #size-cells = <1>;
> > +             ranges;
> > +
> > +             linux,cma {
> > +                     compatible = "shared-dma-pool";
> > +                     no-map;
> > +                     size = <0x80000>;
> > +                     linux,dma-default;
> > +             };
> > +     };
> > +
> >       aliases {
> >               serial0 = &usart1;
> >       };
> >
> > +     backlight: backlight {
> > +             compatible = "gpio-backlight";
> > +             gpios = <&gpiok 3 GPIO_ACTIVE_HIGH>;
> > +             status = "okay";
> > +     };
> > +
> > +     panel_rgb: panel-rgb {
> > +             compatible = "rocktech,rk043fn48h";
> > +             backlight = <&backlight>;
> > +             enable-gpios = <&gpioi 12 GPIO_ACTIVE_HIGH>;
> > +             status = "okay";
> > +             port {
> > +                     panel_in_rgb: endpoint {
> > +                             remote-endpoint = <&ltdc_out_rgb>;
> > +                     };
> > +             };
> > +     };
> > +
> >       usbotg_hs_phy: usb-phy {
> >               #phy-cells = <0>;
> >               compatible = "usb-nop-xceiv";
> > @@ -99,6 +130,26 @@ &i2c1 {
> >       status = "okay";
> >   };
> >
> > +&dma1 {
> > +     status = "okay";
> > +};
> > +
> > +&dma2 {
> > +     status = "okay";
> >
> Why do you enable DMAs ? It seems not used by LTDC.

You're right, I'll send version 6 shortly with the removal of DMA.

Thanks and regards,
Dario

>
> > +&ltdc {
> > +     pinctrl-0 = <&ltdc_pins_a>;
> > +     pinctrl-names = "default";
> > +     status = "okay";
> > +
> > +     port {
> > +             ltdc_out_rgb: endpoint {
> > +                     remote-endpoint = <&panel_in_rgb>;
> > +             };
> > +     };
> > +};
> > +
> >   &sdio1 {
> >       status = "okay";
> >       vmmc-supply = <&mmc_vcard>;
>


-- 

Dario Binacchi

Senior Embedded Linux Developer

dario.binacchi@amarulasolutions.com

__________________________________


Amarula Solutions SRL

Via Le Canevare 30, 31100 Treviso, Veneto, IT

T. +39 042 243 5310
info@amarulasolutions.com

www.amarulasolutions.com

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