linux-kernel - Re: [PATCH RESEND v3 3/3] arm64: dts: qcom: Add missing TCSR ref clock to the DP PHYs

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Message-ID: <ivigimfa6lp5rbjdw26t5witdpnlghvbnlljc2aspst457hadu@4yuudxoxx26x>
Date: Tue, 14 Oct 2025 13:23:19 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Sibi Sankar <sibi.sankar@....qualcomm.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH RESEND v3 3/3] arm64: dts: qcom: Add missing TCSR ref
 clock to the DP PHYs

On Tue, Oct 14, 2025 at 12:46:05PM +0300, Abel Vesa wrote:
> The DP PHYs on X1E80100 need the ref clock which is provided by the
> TCSR CC.
> 
> The current X Elite devices supported upstream work fine without this
> clock, because the boot firmware leaves this clock enabled. But we should
> not rely on that. Also, even though this change breaks the ABI, it is
> needed in order to make the driver disables this clock along with the
> other ones, for a proper bring-down of the entire PHY.
> 
> So lets attach it to each of the DP PHYs in order to do that.
> 
> Cc: stable@...r.kernel.org # v6.9
> Fixes: 1940c25eaa63 ("arm64: dts: qcom: x1e80100: Add display nodes")
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry