linux-kernel - Re: [PATCH v2] drivers/firmware: fix SYSFB depends to prevent build failures

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Message-ID: <CAMuHMdX+hsXeoY8jNdDvyiw2HxhwcQw60LJddsaOGZBcHT=a=A@mail.gmail.com>
Date:   Tue, 27 Jul 2021 13:39:45 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Peter Robinson <pbrobinson@...il.com>,
        Mark Brown <broonie@...nel.org>,
        kernel test robot <lkp@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Colin Ian King <colin.king@...onical.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v2] drivers/firmware: fix SYSFB depends to prevent build failures

Hi Javier,

On Tue, Jul 27, 2021 at 1:32 PM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> On 7/27/21 1:17 PM, Geert Uytterhoeven wrote:
> >> Not enabling this, would mean that a platform device to match a driver
> >> supporting the EFI GOP framebuffer (e.g: simple{drm,fb} or efifb) will
> >> not be registered. Which will lead to not having an early framebuffer.
> >
> > Do all (embedded) EFI systems have a frame buffer?
>
> That's a good question. I don't know if all EFI firmwares are expected
> to provide a GOP or not. But even the u-boot EFI stub provides one, if
> video output is supported by u-boot on that system.
>
> > Perhaps SYSFB should be selected by SYSFB_SIMPLEFB, FB_VESA,
> > and FB_EFI?
>
> It's another option, yes. I just thought that the use of select was not
> encouraged and using depends was less fragile / error prone.

Select is very useful for config symbols that are invisible to the user (i.e.
cannot be enabled/disabled manually).

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds