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

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Date:   Mon, 2 Oct 2023 10:54:57 +0200
From:   Johan Hovold <johan@...nel.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, Sep 29, 2023 at 06:02:57PM +0200, Konrad Dybcio wrote:
> The DP PHY needs different settings when an eDP display is used.
> Make sure these apply on the X13s.

Good catch. This looks to be more in line with what Bjorn intended.

You should fix up sc8280xp-crd and sa8295p-adp.dts as well however.

> FWIW
> I could not notice any user-facing change stemming from this commit.

I've seen some infrequent link-training failures (e.g. on resume) even if
it's been a while since last time now.

> 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.

sa8295p-adp appears to use mdss[01]_dp[23] for eDP.

> ---
>  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";

Nit: Can you add a newline here after the compatible, please?

>  	vdda-phy-supply = <&vreg_l6b>;
>  	vdda-pll-supply = <&vreg_l3b>;

Johan