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

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Message-ID: <3d5868e7-13df-4608-95c7-02f08ae2024e@ixit.cz>
Date: Wed, 7 Jan 2026 12:52:44 +0100
From: David Heidelberg <david@...t.cz>
To: petr.hodina@...tonmail.com, 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>, Taniya Das <quic_tdas@...cinc.com>
Cc: 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 07/01/2026 12:44, 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: David Heidelberg <david@...t.cz>