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

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Message-ID: <702e4696-5ff6-4c72-bce4-1a9a8ee1ba18@packett.cool>
Date: Thu, 8 Jan 2026 20:00:13 -0300
From: Val Packett <val@...kett.cool>
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>, David Heidelberg <david@...t.cz>,
 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 1/7/26 8:44 AM, 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.

Hm, we don't have this flag set in dispcc-x1e80100.c either!

The only random freeze we have on that platform seems related to PCIe 
ASPM with NVMe drives, but during display configuration.. *extremely* 
rarely, but the eDP display output can get stuck on a blue screen. Many 
run with clk_ignore_unused for the early uefi framebuffer though.

~val