linux-kernel - Re: [PATCH v15 12/13] drm/msm/dpu: support plane splitting in quad-pipe case

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Message-ID: <hzkvl7zyuq2fsavp2butdvbfykpzw5lz4f2eg2rzu4hgbxxq4j@tmoxnq2t5koq>
Date: Thu, 4 Sep 2025 20:29:03 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Jun Nie <jun.nie@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <lumag@...nel.org>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v15 12/13] drm/msm/dpu: support plane splitting in
 quad-pipe case

On Fri, Sep 05, 2025 at 12:09:52AM +0800, Jun Nie wrote:
> Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com> 于2025年9月3日周三 17:39写道：
> >
> > On Tue, Aug 19, 2025 at 09:31:06AM +0800, Jun Nie wrote:
> > > The content of every half of screen is sent out via one interface in
> > > dual-DSI case. The content for every interface is blended by a LM
> > > pair in quad-pipe case, thus a LM pair should not blend any content
> > > that cross the half of screen in this case. Clip plane into pipes per
> > > left and right half screen ROI if topology is quad pipe case.
> > >
> > > The clipped rectangle on every half of screen is futher handled by two
> > > pipes if its width exceeds a limit for a single pipe.
> > >
> > > Signed-off-by: Jun Nie <jun.nie@...aro.org>
> > > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> >
> > I've run several CI workloads. This is the first commit which breaks IGT
> > tests. See https://gitlab.freedesktop.org/drm/msm/-/pipelines/1503075
> 
> Thanks for the work! I did test locally with all my patch set on sm8650 and
> did not reproduce the issue. The baseline is not aligned with msm-next-lumag
> yet because I need to port my platform patches to it. I will do it tomorrow.
>  Do you think this issue is related to difference of sm8650 and sm8350?
> Regarding all failure cases are write back related.

First of all, It's not only about SM8350. Tests also fail on SC7180.

Second, it's not about write back. I see various test failures. Please
rerun the test suite with virtual planes being disabled on SM8650 HDK.

-- 
With best wishes
Dmitry