linux-kernel - Re: [PATCH v5 0/4] Allow disabling all native fbdev drivers and only keeping DRM emulation

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Date:   Tue, 18 Jul 2023 21:37:28 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Javier Martinez Canillas" <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        "Thomas Zimmermann" <tzimmermann@...e.de>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        "Borislav Petkov" <bp@...en8.de>,
        "Daniel Thompson" <daniel.thompson@...aro.org>,
        "Daniel Vetter" <daniel@...ll.ch>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>,
        "Dave Airlie" <airlied@...il.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, "Helge Deller" <deller@....de>,
        "Ingo Molnar" <mingo@...hat.com>,
        "Jacek Lawrynowicz" <jacek.lawrynowicz@...ux.intel.com>,
        "Jingoo Han" <jingoohan1@...il.com>, "Lee Jones" <lee@...nel.org>,
        "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
        "Maxime Ripard" <mripard@...nel.org>,
        "Melissa Wen" <mwen@...lia.com>,
        "Nipun Gupta" <nipun.gupta@....com>,
        "Oded Gabbay" <ogabbay@...nel.org>,
        "Randy Dunlap" <rdunlap@...radead.org>,
        "Sam Ravnborg" <sam@...nborg.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH v5 0/4] Allow disabling all native fbdev drivers and only keeping
 DRM emulation

On Fri, Jul 14, 2023, at 19:16, Javier Martinez Canillas wrote:
> This patch series splits the fbdev core support in two different Kconfig
> symbols: FB and FB_CORE. The motivation for this is to allow CONFIG_FB to
> be disabled, while still having the the core fbdev support needed for the
> CONFIG_DRM_FBDEV_EMULATION to be enabled. The motivation is automatically
> disabling all fbdev drivers instead of having to be disabled individually.
>
> The reason for doing this is that now with simpledrm, there's no need for
> the legacy fbdev (e.g: efifb or vesafb) drivers anymore and many distros
> now disable them. But it would simplify the config a lot fo have a single
> Kconfig symbol to disable all fbdev drivers.
>
> I've built tested with possible combinations of CONFIG_FB, CONFIG_FB_CORE,
> CONFIG_DRM_FBDEV_EMULATION and CONFIG_FB_DEVICE symbols set to 'y' or 'n'.
>
> Patch #1 moves the auxdisplay drivers to "Graphics support" Kconfig menu,
> patch #2 moves the core fbdev Kconfig symbols to a separate Kconfig file,
> patch #3 does the FB symbol split and introduces the FB_CORE symbol and
> finally patch #4 makes the DRM symbol to select FB_CORE if the DRM fbdev
> emualtion support was enabled.
>
> Since this series touches three subsystems (auxdisplay, fbdev and DRM),
> I would like to merge it through DRM with the acks of these maintainers.
>
> This is a v5 of the patch-set that addresses issues pointed out by Arnd
> Bergmann, Thomas Zimmermann and Geert Uytterhoeven in the previous v4:
>
> https://lists.freedesktop.org/archives/dri-devel/2023-July/411842.html

Looks all good to me, except for two minor things I found in build testing
and replied to separately. With those fixed:

Reviewed-by: Arnd Bergmann <arnd@...db.de>
Tested-by: Arnd Bergmann <arnd@...db.de>