linux-kernel - Re: [PATCH v4 2/2] arm64: dts: qcom: lemans: Add eDP ref clock for eDP PHYs

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Message-ID: <795c4862-de48-44b4-9af9-6d9185a3c3ea@oss.qualcomm.com>
Date: Wed, 28 Jan 2026 13:41:36 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Ritesh Kumar <quic_riteshk@...cinc.com>, robin.clark@....qualcomm.com,
        lumag@...nel.org, abhinav.kumar@...ux.dev, sean@...rly.run,
        marijn.suijten@...ainline.org, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
        simona@...ll.ch, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, quic_mahap@...cinc.com, andersson@...nel.org,
        konradybcio@...nel.org, mani@...nel.org,
        James.Bottomley@...senPartnership.com, martin.petersen@...cle.com,
        vkoul@...nel.org, kishon@...nel.org,
        cros-qcom-dts-watchers@...omium.org
Cc: linux-phy@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, quic_vproddut@...cinc.com
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: lemans: Add eDP ref clock for
 eDP PHYs

On 1/28/26 12:48 PM, Ritesh Kumar wrote:
> The eDP PHY nodes on lemans were missing the reference clock voting.
> This initially went unnoticed because the clock was implicitly enabled
> by the UFS PHY driver, and the eDP PHY happened to rely on that.
> 
> After commit 77d2fa54a945 ("scsi: ufs: qcom : Refactor phy_power_on/off
> calls"), the UFS driver no longer keeps the reference clock enabled.
> As a result, the eDP PHY fails to power on.
> 
> To fix this, add eDP reference clock for eDP PHYs on lemans chipset
> ensuring reference clock is enabled.
> 
> Fixes: e1e3e5673f8d7 ("arm64: dts: qcom: sa8775p: add DisplayPort device nodes")
> Signed-off-by: Ritesh Kumar <quic_riteshk@...cinc.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad