Re: [PATCH v2 3/3] arm64: dts: qcom: kodiak: Set up 4-lane DP

[Dmitry Baryshkov]

On Wed, Apr 29, 2026 at 12:10:42PM +0530, Mahadevan P wrote:
> From: Mahadevan P <mahap@xxxxxxxxxxxxxxxx>
> 
> Allow up to 4 lanes for the DisplayPort link from the PHY to the
> controller now the mode-switch events can reach the QMP Combo PHY.
> 
> Signed-off-by: Mahadevan P <mahadevan.p@xxxxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/qcom/kodiak.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/kodiak.dtsi b/arch/arm64/boot/dts/qcom/kodiak.dtsi
> index 0acc6917d7aa..204513a6bd89 100644
> --- a/arch/arm64/boot/dts/qcom/kodiak.dtsi
> +++ b/arch/arm64/boot/dts/qcom/kodiak.dtsi
> @@ -5704,7 +5704,7 @@ dp_in: endpoint {
>  					port@1 {
>  						reg = <1>;
>  						mdss_dp_out: endpoint {
> -							data-lanes = <0 1>;
> +							data-lanes = <0 1 2 3>;

So, basically, you've force-enabled 4 lanes for all devices, even though
they had 2 lanes enabled only. Don't do that. Squash it to the previous
commit and enable carefully, only for the platforms where you actually
know that there are 4 DP lanes to be used.

>  							remote-endpoint = <&usb_dp_qmpphy_dp_in>;
>  						};
>  					};
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry