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

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Message-ID: <20210727114959.GQ4670@sirena.org.uk>
Date:   Tue, 27 Jul 2021 12:49:59 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        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>,
        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

On Tue, Jul 27, 2021 at 01:32:29PM +0200, Javier Martinez Canillas wrote:
> On 7/27/21 1:17 PM, Geert Uytterhoeven wrote:

> > 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.

No, GOP is only mandatory for systems with a graphical console device
even assuming things fully conform to the spec.  Indeed I've got a
non-embedded EFI based system sitting next to my desk here which only
has a serial console, never mind anything embedded.  

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