linux-kernel - Re: [PATCH 3/5] drm/msm/dpu: Check mode against PINGPONG or DSC max width

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Message-ID: <dw3zx6m3xcavzz24w42jnunh6s36neemst43w375pfhdvdscoi@ap4cprx65rbf>
Date: Sat, 3 Jan 2026 19:43:42 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Xilin Wu <sophon@...xa.com>
Cc: Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Rob Clark <robdclark@...il.com>, 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>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Abhinav Kumar <abhinav.kumar@....qualcomm.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] drm/msm/dpu: Check mode against PINGPONG or DSC max
 width

On Wed, Dec 31, 2025 at 04:30:33PM +0800, Xilin Wu wrote:
> On 5/15/2025 7:52 AM, Jessica Zhang wrote:
> > Validate requested mode and topology based on the PINGPONG or DSC encoder
> > max width. In addition, drop MAX_HDISPLAY_SPLIT and base LM reservation
> > off of PINGPONG or DSC encoder max width
> > 
> > As noted in the patch, while DPU 8.x+ supports a max linewidth of 8960
> > for PINGPONG_0, there is some additional logic that needs to be added to
> > the resource manager to specifically try and reserve PINGPONG_0 for
> > modes that are greater than 5k.
> > 
> > Since this is out of the scope of this series, add a helper that will
> > get the overall minimum PINGPONG max linewidth for a given chipset.
> > 
> > Signed-off-by: Jessica Zhang <jessica.zhang@....qualcomm.com>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 46 +++++++++++++++++++++++++++-----
> >   1 file changed, 39 insertions(+), 7 deletions(-)
> > 
> Thanks for the patches! With patch 2&3 applied on top of v6.18, I'm able to
> get DSI panel and DP monitor working simultaneously on qcs6490.
> 
> Tested-by: Xilin Wu <sophon@...xa.com> # qcs6490-radxa-dragon-q6a

I've updated the series, would you be able to test it, please:

https://lore.kernel.org/linux-arm-msm/20260103-max-mixer-width-v2-0-ef5d3d246709@oss.qualcomm.com/

-- 
With best wishes
Dmitry