linux-kernel - Re: [PATCH v2] clk: qcom: dispcc-sdm845: Enable parents for pixel clocks

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Message-ID: <e4sfp2cexck3llleywxev6hfn72zx7kuq73kdzckks6qms3fvl@i5jjlq6y6rcg>
Date: Wed, 7 Jan 2026 14:11:16 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: petr.hodina@...tonmail.com
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, David Heidelberg <david@...t.cz>,
        Taniya Das <quic_tdas@...cinc.com>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        phone-devel@...r.kernel.org
Subject: Re: [PATCH v2] clk: qcom: dispcc-sdm845: Enable parents for pixel
 clocks

On Wed, Jan 07, 2026 at 12:44:43PM +0100, Petr Hodina via B4 Relay wrote:
> From: Petr Hodina <petr.hodina@...tonmail.com>
> 
> Add CLK_OPS_PARENT_ENABLE to MDSS pixel clock sources to ensure parent
> clocks are enabled during clock operations, preventing potential
> stability issues during display configuration.
> 
> Fixes: 81351776c9fb ("clk: qcom: Add display clock controller driver for SDM845")
> Signed-off-by: Petr Hodina <petr.hodina@...tonmail.com>
> ---
> We are currently running the latest linux-next snapshots (next-202511*
> and next-202512*) and have encountered random freezes and crashes on the
> Pixel 3, as well as crash dumps on the OnePlus 6 and 6T.
> 
> This commit fixes the stability issue. I've checked other SDM dispcc
> files and they also contain this configuration.
> 
> For safety I also set the configuration for `disp_cc_mdss_pclk1_clk_src`
> though it should be sufficient only for `disp_cc_mdss_pclk0_clk_src`.
> 
> Kind regards,
> Petr
> ---
> Changes in v2:
> - Remove commits from v1 and introduce proper fix.
> - Link to v1: https://lore.kernel.org/r/20251213-stability-discussion-v1-0-b25df8453526@ixit.cz
> ---
>  drivers/clk/qcom/dispcc-sdm845.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

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


-- 
With best wishes
Dmitry