linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp-x13s: Use the correct DP PHY compatible

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Date:   Mon, 16 Oct 2023 11:51:33 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp-x13s: Use the correct DP PHY compatible

On Fri, 29 Sept 2023 at 19:03, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> The DP PHY needs different settings when an eDP display is used.
> Make sure these apply on the X13s.

Could you please clarify, is it the same PHY type, just being
repurposed for eDP or is it a different PHY type?

If the former is the case (and the same PHY can be used for both DP
and eDP), it should carry the same compatible string and use software
mechanisms (e.g. phy_set_mode_ext()) to be programmed for the correct
operation mode.

>
> FWIW
> I could not notice any user-facing change stemming from this commit.
>
> Fixes: f48c70b111b4 ("arm64: dts: qcom: sc8280xp-x13s: enable eDP display")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> I have no idea whether DP3 is hardwired to be eDP, like it
> seems to be on the last DP controller of SC7280. In that
> case this would be moved to the SoC DTSI.
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index 38edaf51aa34..6a4c6cc19c09 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -601,6 +601,7 @@ mdss0_dp3_out: endpoint {
>  };
>
>  &mdss0_dp3_phy {
> +       compatible = "qcom,sc8280xp-edp-phy";
>         vdda-phy-supply = <&vreg_l6b>;
>         vdda-pll-supply = <&vreg_l3b>;
>
>
> ---
> base-commit: df964ce9ef9fea10cf131bf6bad8658fde7956f6
> change-id: 20230929-topic-x13s_edpphy-0e172498c432
>
> Best regards,
> --
> Konrad Dybcio <konrad.dybcio@...aro.org>
>


-- 
With best wishes
Dmitry