linux-kernel - Re: [PATCH v2 4/4] arm64: dts: qcom: sm8750-mtp: Enable DisplayPort over USB

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Message-ID: <c8584278-f771-4976-bdae-03379e1f2d03@oss.qualcomm.com>
Date: Thu, 13 Nov 2025 10:25:09 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: Jessica Zhang <jesszhan@...cinc.com>,
        Abhinav Kumar
 <abhinavk@...cinc.com>,
        Abel Vesa <abel.vesa@...aro.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v2 4/4] arm64: dts: qcom: sm8750-mtp: Enable DisplayPort
 over USB

On 11/12/25 4:02 PM, Krzysztof Kozlowski wrote:
> Hook up DisplayPort parts over Type-C USB on MTP8750.
> 
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 4 ++++
>  arch/arm64/boot/dts/qcom/sm8750.dtsi    | 2 ++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
> index a08bedd2987e..8d5a5d89a2ad 100644
> --- a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
> @@ -983,6 +983,10 @@ &mdss {
>  	status = "okay";
>  };
>  
> +&mdss_dp0 {
> +	status = "okay";
> +};

If you add:

&mdss_dp0_out {
        link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
};

you'll unlock HBR3 too

Konrad