linux-kernel - Re: [PATCH 4/6] drm/msm/dpu: Fix pixel extension sub-sampling

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Message-ID: <3eqazsv2f2or4l2xkyqetddxmfqmrejlskafgtvbnkfqoutv7y@cjnvezhfwloj>
Date: Tue, 28 Oct 2025 23:26:03 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Vladimir Lypak <vladimir.lypak@...il.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Kalyan Thota <quic_kalyant@...cinc.com>,
        Vinod Polimera <quic_vpolimer@...cinc.com>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Barnabás Czémán <barnabas.czeman@...nlining.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] drm/msm/dpu: Fix pixel extension sub-sampling

On Fri, Oct 17, 2025 at 07:58:38PM +0000, Vladimir Lypak wrote:
> In _dpu_plane_setup_pixel_ext function instead of dividing just chroma
> source resolution once (component 1 and 2), second component is divided
> once more because src_w and src_h variable is reused between iterations.
> Third component receives wrong source resolution too (from component 2).
> To fix this introduce temporary variables for each iteration.
> 
> Fixes: dabfdd89eaa9 ("drm/msm/disp/dpu1: add inline rotation support for sc7280")
> Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry