linux-kernel - Re: [PATCH v3 06/21] drm/msm/dpu: Use V2 DITHER PINGPONG sub-block in SM8[34]50/SC8280XP

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Date:   Wed, 26 Apr 2023 12:11:39 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
CC:     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>,
        <~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 v3 06/21] drm/msm/dpu: Use V2 DITHER PINGPONG sub-block in
 SM8[34]50/SC8280XP



On 4/26/2023 12:08 PM, Marijn Suijten wrote:
> On 2023-04-26 09:24:19, Abhinav Kumar wrote:
>>
>>
>> On 4/25/2023 4:05 PM, Marijn Suijten wrote:
>>> According to downstream sources this DITHER sub-block sits at an offset
>>> of 0xe0 with version 0x20000.  The PP_BLK_DITHER macro is _not_ used as
>>> downstream still says the size of the PINGPONG block is 0xd4 and not 0.
>>>
>>
>> the PINGPONG block size is 0x0 on sm8350, sm8450 and sc8280xp.
>>
>> and length of dither is 0x20 and they all start at 0xe0.
>>
>> So now does anything prevent us from using PP_BLK_DITHER macro for these?
> 
> Nothing prevents it from being used (if you are referring to our
> previous conversations) besides this information not being available in
> public DTS (I simply did not know) and the fact that all these many
> fixes - however necessary they are - distract from the main topic of
> this series: bringing INTF TE support to DPU1.
> 

Yeah, you could have sent these as a separate series if you wanted to 
stick to this one being only intf te.

> I'll fit in that patch though, as I have to send v4 anyway.

Thanks.

> 
> - Marijn