linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: Add missing TCSR refclk to the DP PHYs

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Message-ID: <34d9e8eb-e0f4-47e9-a731-fe50e932fea1@oss.qualcomm.com>
Date: Thu, 4 Sep 2025 10:40:36 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Abel Vesa <abel.vesa@...aro.org>, 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 <quic_sibis@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>
Cc: Johan Hovold <johan@...nel.org>, Taniya Das <quic_tdas@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...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 v2 3/3] arm64: dts: qcom: Add missing TCSR refclk to the
 DP PHYs

On 9/3/25 2:37 PM, Abel Vesa wrote:
> The DP PHYs on X1E80100 need the refclk which is provided
> by the TCSR CC. So add it to the PHYs.
> 
> Cc: stable@...r.kernel.org # v6.9

You want to backport this to 6.9, but you also want to backport
the driver patch to 6.10, "meh"

I'm not sure it makes sense to backport functionally, as this would
only exhibit issues if:

a) the UEFI did no work to enable the refclk
or:
b) unused cleanup would happen

but the board would not survive booting with b) in v6.9, at least
it wouldn't have display  - see Commit b60521eff227 ("clk: qcom:
gcc-x1e80100: Unregister GCC_GPU_CFG_AHB_CLK/GCC_DISP_XO_CLK")

and a) is not something we'd hit on any of the upstream-supported
targets

Konrad