linux-kernel - Re: [PATCH RFC 10/10] drm/panel/sony-griffin-samsung: Add panel driver for Sony Xperia 1

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Message-ID: <CACRpkdZSNzeh8v=HW6948dJ8j0xNMhgrAz2+CpvQX=meGwPkyg@mail.gmail.com>
Date:   Wed, 28 Jun 2023 21:18:38 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Caleb Connolly <caleb@...nolly.tech>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        devicetree@...r.kernel.org,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Martin Botka <martin.botka@...ainline.org>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>
Subject: Re: [PATCH RFC 10/10] drm/panel/sony-griffin-samsung: Add panel
 driver for Sony Xperia 1

On Wed, Jun 28, 2023 at 4:20 PM Marijn Suijten
<marijn.suijten@...ainline.org> wrote:

> But for now we might already create a step-up version of that by having
> a "Samsung panel driver library" to deduplicate generic commands, which
> drivers can freely call into?

Yeah something like that is likely what we want.

> On the other hand of the spectrum we currently have 4 downstream panels
> for Sony devices that all declare to be using the sofef01 controller,
> but with vastly different command sets.  And even if we "accidentally"
> send the wrong set for the wrong device, the panel works anyway with no
> noticeable color shifts or otherwise...

Yeah that is typically the case :/

We should try to group the similar code together and expect that sooner
or later we will figure out what display controller(s) it is and name it after
that rather than after the panel (which I define as the combination of
a display controller and an actual panel).

Yours,
Linus Walleij