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

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Message-ID: <lkpcsed5wkyztbysmiks5xk3ojr3dw74ef65cpoycclxjmbnsp@5adctm46fc3z>
Date: Fri, 19 Sep 2025 03:41:56 +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 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


-- 
With best wishes
Dmitry