linux-kernel - Re: [PATCH v2] drm/msm/disp/dpu: add merge3d support for sc7280

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Message-ID: <nao4o76zlvkmak6t47ubcqjnkfe3bdkdounixwdpgox26yfmg2@ltpayjaow6h5>
Date: Sat, 3 Jan 2026 01:53:28 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Mahadevan P <mahadevan.p@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/disp/dpu: add merge3d support for sc7280

On Thu, Jan 01, 2026 at 10:34:38AM +0530, Mahadevan P wrote:
> On SC7280 targets, display modes with a width greater than the
> max_mixer_width (2400) are rejected during mode validation when
> merge3d is disabled. This limitation exists because, without a
> 3D merge block, two layer mixers cannot be combined(non-DSC interface),
> preventing large layers from being split across mixers. As a result,
> higher resolution modes cannot be supported.
> 
> Enable merge3d support on SC7280 to allow combining streams from
> two layer mixers into a single non-DSC interface. This capability
> removes the width restriction and enables buffer sizes beyond the
> 2400-pixel limit.
> 
> Fixes: 591e34a091d1 ("drm/msm/disp/dpu1: add support for display for SC7280 target")
> Signed-off-by: Mahadevan P <mahadevan.p@....qualcomm.com>
> ---
> Changes in v2:
>   - Updated commit message for clarity (Dmitry).
> ---
>  drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 

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


-- 
With best wishes
Dmitry