linux-kernel - Re: [Freedreno] [PATCH 2/3] drm/msm/dpu1: Add MSM8998 to hw catalog

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Message-ID: <CAOCk7NoOdjxp0vxu9XJzYsi7a04kpqpTOZHm42ApAN3MqkqtDw@mail.gmail.com>
Date:   Tue, 7 Sep 2021 13:12:50 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        lkml <linux-kernel@...r.kernel.org>,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, paul.bouchara@...ainline.org,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [Freedreno] [PATCH 2/3] drm/msm/dpu1: Add MSM8998 to hw catalog

On Wed, Sep 1, 2021 at 12:11 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...ainline.org> wrote:
>
> Bringup functionality for MSM8998 in the DPU, driver which is mostly
> the same as SDM845 (just a few variations).
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>

I don't seem to see a cover letter for this series.

Eh, there are a fair number of differences between the MDSS versions
for 8998 and 845.

Probably a bigger question, why extend the DPU driver for 8998, when
the MDP5 driver already supports it[1]?  The MDP/DPU split is pretty
dumb, but I don't see a valid reason for both drivers supporting the
same target/display revision.  IMO, if you want this support in DPU,
remove it from MDP5.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.14&id=d6c7b2284b14c66a268a448a7a8d54f585d38785