linux-kernel - Re: [PATCH v16 00/10] drm/msm/dpu: Support quad pipe with dual-interface

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Message-ID: <ibmp5mztq6ykktbtbhhxwvejwtaznr3m32u2t7xz3ujo5akkc3@gvdzchiu47hd>
Date: Fri, 19 Sep 2025 21:50:30 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Jun Nie <jun.nie@...aro.org>
Cc: Abhinav Kumar <abhinav.kumar@...ux.dev>,
        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>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Subject: Re: [PATCH v16 00/10] drm/msm/dpu: Support quad pipe with
 dual-interface

On Fri, Sep 19, 2025 at 03:41:56AM +0300, Dmitry Baryshkov wrote:
> On Thu, Sep 18, 2025 at 09:28:52PM +0800, Jun Nie wrote:
> > 2 or more SSPPs and dual-DSI interface are need for super wide panel.
> > And 4 DSC are preferred for power optimal in this case due to width
> > limitation of SSPP and MDP clock rate constrain. This patch set
> > extends number of pipes to 4 and revise related mixer blending logic
> > to support quad pipe. All these changes depends on the virtual plane
> > feature to split a super wide drm plane horizontally into 2 or more sub
> > clip. Thus DMA of multiple SSPPs can share the effort of fetching the
> > whole drm plane.
> > 
> > The first pipe pair co-work with the first mixer pair to cover the left
> > half of screen and 2nd pair of pipes and mixers are for the right half
> > of screen. If a plane is only for the right half of screen, only one
> > or two of pipes in the 2nd pipe pair are valid, and no SSPP or mixer is
> > assinged for invalid pipe.
> > 
> > For those panel that does not require quad-pipe, only 1 or 2 pipes in
> > the 1st pipe pair will be used. There is no concept of right half of
> > screen.
> > 
> > For legacy non virtual plane mode, the first 1 or 2 pipes are used for
> > the single SSPP and its multi-rect mode.
> >     
> >     Changes in v16:
> >     - Rebase to latest branch msm-next-lumag.
> >     - Fix IGT test failures.
> >     - Drop patches that have been merged.
> >     - Link to v15: https://lore.kernel.org/r/20250819-v6-16-rc2-quad-pipe-upstream-v15-0-2c7a85089db8@linaro.org
> 
> Thanks. It's too invasive and too late for 6.18, but I've started the
> test run at https://gitlab.freedesktop.org/drm/msm/-/merge_requests/191

JFYI: this has passed the IGT testing, so it will be picked up soon
after 6.18-rc1.

-- 
With best wishes
Dmitry