linux-kernel - Re: [PATCH] drm/msm/dpu: disable gamma correction unit on SC7180

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Message-ID: <6457c60a-2ede-4df8-ad82-d974690eba89@oss.qualcomm.com>
Date: Mon, 17 Nov 2025 12:25:36 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....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>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Federico Amedeo Izzo <federico@...o.pro>
Subject: Re: [PATCH] drm/msm/dpu: disable gamma correction unit on SC7180

On 11/15/25 4:08 AM, Dmitry Baryshkov wrote:
> IGT reported test failures with Gamma correction block on SC7180.
> Disable GC subblock on SC7180 until we trage the issue.
> 
> Cc: Federico Amedeo Izzo <federico@...o.pro>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
> Most likely I will squash this into the GC patch
> ---

Peeking at downstream, 7180 and 845 should have the exact same GC
(v1.8).. it seems like there's an attempt to program it through
REGDMA instead of regular reg access. Not sure if it's actually
necessary or just an optimization

What tests are exactly failing? I couldn't track it down on FDO GL

Konrad