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

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Message-ID: <CABymUCNXVfZyhCbkiqzJ-K2zGe=bofD82OD20d-CG+a-KkgN5Q@mail.gmail.com>
Date: Fri, 5 Sep 2025 00:09:52 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
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

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.

- Jun

>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  11 +++
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h  |   2 +
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 137 +++++++++++++++++++++---------
> >  3 files changed, 110 insertions(+), 40 deletions(-)
>
> --
> With best wishes
> Dmitry