linux-kernel - Re: [PATCH v4 07/22] drm/msm/dpu: Set PINGPONG block length to zero for DPU >= 7.0.0

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Date:   Wed, 26 Apr 2023 15:46:17 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Sean Paul" <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Adam Skladowski <a39.skl@...il.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Kuogee Hsieh" <quic_khsieh@...cinc.com>,
        Robert Foss <rfoss@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>
CC:     <~postmarketos/upstreaming@...ts.sr.ht>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Martin Botka <martin.botka@...ainline.org>,
        "Jami Kettunen" <jami.kettunen@...ainline.org>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Subject: Re: [PATCH v4 07/22] drm/msm/dpu: Set PINGPONG block length to zero
 for DPU >= 7.0.0



On 4/26/2023 3:37 PM, Marijn Suijten wrote:
> Despite downstream DTS stating otherwise, the PINGPONG block has no
> registers starting with DPU revision 7.0.0.  TEAR registers are gone
> since DPU 5.0.0 after being moved to the INTF block, and DSC registers
> are gone since 7.0.0, leaving only the dither sub-block.
> 
> A future patch, part of the DSC 1.2 series, should disable DSC functions
> on the PINGPONG block for all DPU >= 7.0.0 hardware.

Noted

> 
> Fixes: 4a352c2fc15a ("drm/msm/dpu: Introduce SC8280XP")
> Fixes: 0e91bcbb0016 ("drm/msm/dpu: Add SM8350 to hw catalog")
> Fixes: 100d7ef6995d ("drm/msm/dpu: add support for SM8450")
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>