[PATCH 3/4] arm64: dts: mediatek: Use DP AltMode defines

[Dmitry Baryshkov]

On Wed, Oct 14, 2026 at 11:31:51PM +0200, Sebastian Reichel wrote:
> From: Sebastian Reichel <sebastian.reichel at collabora.com>
> 
> Use the new USB-C DP AltMode defines for the SVID and the capabilities
> VDO to make the DTs more readable. This also fixes up mt8390 Genio
> platform incorrectly announcing UFP_D (upwards facing) support. This
> feature is unfortunately not supported by the SoC.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
> ---
>  arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi |  8 ++++++--
>  arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi | 10 ++++++++--
>  2 files changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi b/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
> index 669eaec662f3..02f8b33d64ac 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
> @@ -527,8 +527,12 @@ PDO_FIXED_DUAL_ROLE |
>  
>  			altmodes {
>  				displayport {
> -					svid = /bits/ 16 <0xff01>;
> -					vdo = <0x001c1c47>;
> +					svid = /bits/ 16 <USB_DISPLAYPORT_SVID>;

USB_SVID_DP_ALTMODE

> +					vdo = <VDO_DP(DP_CAP_DPAM_V2_0, DP_CAP_CABLE_TYPE_PASSIVE,
> +						      DP_CAP_UHBR_13_5_UNSUPPORTED,
> +						      DP_PIN_UFP_NONE, DP_PIN_DFP_C_D_E,
> +						      DP_CAP_USB2_USED, DP_CAP_RECEPTACLE,
> +						      DP_CAP_SIGNALLING_HBR3, DP_CAP_DFP_D)>;
>  				};
>  			};
>  
> diff --git a/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi b/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi
> index aef908df530e..3f7d57dfcf93 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8395-genio-common.dtsi
> @@ -597,8 +597,14 @@ PDO_FIXED_DUAL_ROLE |
>  
>  				altmodes {
>  					displayport {
> -						svid = /bits/ 16 <0xff01>;
> -						vdo = <0x00001c46>;
> +						svid = /bits/ 16 <USB_DISPLAYPORT_SVID>;

USB_SVID_DP_ALTMODE

> +						vdo = <VDO_DP(DP_CAP_DPAM_V2_0,
> +							      DP_CAP_CABLE_TYPE_PASSIVE,
> +							      DP_CAP_UHBR_13_5_UNSUPPORTED,
> +							      DP_PIN_UFP_NONE, DP_PIN_DFP_C_D_E,
> +							      DP_CAP_USB2_USED, DP_CAP_RECEPTACLE,
> +							      DP_CAP_SIGNALLING_HBR3,
> +							      DP_CAP_DFP_D)>;
>  					};
>  				};
>  
> 
> -- 
> 2.53.0
> 

-- 
With best wishes
Dmitry