linux-kernel - Re: [PATCH v2 2/2] drm/msm/dpu: try multirect based on mdp clock limits

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Date:   Tue, 26 Sep 2023 13:19:52 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, quic_jesszhan@...cinc.com,
        quic_parellan@...cinc.com, nespera@...lia.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/msm/dpu: try multirect based on mdp clock limits

On Tue, 12 Sept 2023 at 01:16, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>
> It's certainly possible that for large resolutions a single DPU SSPP
> cannot process the image without exceeding the MDP clock limits but
> it can still process it in multirect mode because the source rectangles
> will get divided and can fall within the MDP clock limits.
>
> If the SSPP cannot process the image even in multirect mode, then it
> will be rejected in dpu_plane_atomic_check_pipe().
>
> Hence try using multirect for resolutions which cannot be processed
> by a single SSPP without exceeding the MDP clock limits.
>
> changes in v2:
>         - use crtc_state's adjusted_mode instead of mode
>         - fix the UBWC condition to check maxlinewidth
>
> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


-- 
With best wishes
Dmitry