linux-kernel - Re: [PATCH 14/21] drm/msm/dpu: Support quad-pipe in SSPP checking

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Message-ID: <CABymUCOWXUMgA-x8z3DonANYnUqTyJYgoekXTxALK05ihE+tGA@mail.gmail.com>
Date: Tue, 3 Sep 2024 15:52:54 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/21] drm/msm/dpu: Support quad-pipe in SSPP checking

Dmitry Baryshkov <dmitry.baryshkov@...aro.org> 于2024年8月29日周四 19:38写道：
>
> > @@ -1033,13 +1030,10 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >                         return -E2BIG;
> >                 }
> >
> > -               /*
> > -                * Use multirect for wide plane. We do not support dynamic
> > -                * assignment of SSPPs, so we know the configuration.
> > -                */
> >                 pipe->multirect_index = DPU_SSPP_RECT_0;
> >                 pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
> >
> > +               r_pipe->sspp = pipe->sspp;
>
> NAK
>
I do not understand what's your point here. If multi-rectangle mode is
used, the 2 sw_pipe share a
SSPP structure. Otherwise the right half of mixer pair does not work
and no display on that side,
because there is no SSPP to handle in r_pipe setup.

>
> --
> With best wishes
> Dmitry