linux-kernel - Re: [PATCH v5 00/15] eDP: Support probing eDP panels dynamically instead of hardcoding

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Date:   Fri, 24 Sep 2021 06:59:05 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Andrzej Hajda <a.hajda@...sung.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Ripard <mripard@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Emil Velikov <emil.velikov@...labora.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        linux-sunxi@...ts.linux.dev,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Stanislav Lisovskiy <stanislav.lisovskiy@...el.com>,
        smyakam@...rosoft.com
Subject: Re: [PATCH v5 00/15] eDP: Support probing eDP panels dynamically
 instead of hardcoding

Hi,

On Fri, Sep 24, 2021 at 2:10 AM Andrzej Hajda <a.hajda@...sung.com> wrote:
>
> Hi
>
> removed most cc, due to server limitation
>
>
> W dniu 24.09.2021 o 10:03, Jani Nikula pisze:
> > On Mon, 20 Sep 2021, Doug Anderson <dianders@...omium.org> wrote:
> >> Pushed all 15 to drm-misc-next.
> > ...
> >> e8de4d55c259 drm/edid: Use new encoded panel id style for quirks matching
> >> d9f91a10c3e8 drm/edid: Allow querying/working with the panel ID from
> >> the EDID
> > Hi Doug, Stan's reporting "initializer element is not constant" issues
> > here that were discussed before [1]. I wonder what gives, you said you'd
> > hit them on a draft version, but not with what was merged, and I can't
> > reproduce this either. Curious.
>
>
> Apparently this is grey area of unclear specification.
>
> gcc version below 8 reports error, above 8.1+ should work [1]. I am not
> sure if there is nice workaround for older gcc.
>
>
> [1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69960#c18

So I think the only solution is to go back to the character-at-a-time
version. It's slightly uglier but functionality trumps form.

I'll post something today though it might need to wait a few hours
before I can manage it.

-Doug