linux-kernel - Re: [PATCH v6 10/14] phy: qcom: qmp-usbc: Add USB/DP exclude handling

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Message-ID: <af7y4m6pcaeavwyxmswkjwugya3na4r5uaq2hi7cevt4bu4573@3zzfjxpc6t62>
Date: Fri, 26 Sep 2025 00:55:50 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
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>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        fange.zhang@....qualcomm.com, yongxing.mou@....qualcomm.com,
        li.liu@....qualcomm.com, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Subject: Re: [PATCH v6 10/14] phy: qcom: qmp-usbc: Add USB/DP exclude handling

On Thu, Sep 25, 2025 at 03:04:56PM +0800, Xiangxu Yin wrote:
> When both USB and DP PHY modes are enabled simultaneously on the same
> QMP USBC PHY, it can lead to hardware misconfiguration and undefined
> behavior. This happens because the PHY resources are not designed to
> operate in both modes at the same time.
> 
> To prevent this, introduce a mutual exclusion check between USB and DP
> PHY modes.
> 
> Signed-off-by: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-usbc.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 

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


-- 
With best wishes
Dmitry