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fbdev: Split frame buffer support in FB and FB_CORE symbols
authorJavier Martinez Canillas <javierm@redhat.com>
Wed, 19 Jul 2023 08:15:37 +0000 (10:15 +0200)
committerJavier Martinez Canillas <javierm@redhat.com>
Sat, 22 Jul 2023 10:25:04 +0000 (12:25 +0200)
commit55bffc8170bb5813c51a44b1f4a818ade675fe1f
treedd3dfde9a25d97bccd294d1e4dfe1f51ce10315f
parentdf7915246e798b9ef8326df97b448efba3e9cd43
fbdev: Split frame buffer support in FB and FB_CORE symbols

Currently the CONFIG_FB option has to be enabled even if no legacy fbdev
drivers are needed (e.g: only to have support for framebuffer consoles).

The DRM subsystem has a fbdev emulation layer, but depends on CONFIG_FB
and so it can only be enabled if that dependency is enabled as well.

That means fbdev drivers have to be explicitly disabled if users want to
enable CONFIG_FB, only to use fbcon and/or the DRM fbdev emulation layer.

This patch introduces a non-visible CONFIG_FB_CORE symbol that could be
enabled just to have core support needed for CONFIG_DRM_FBDEV_EMULATION,
allowing CONFIG_FB to be disabled (and automatically disabling all the
fbdev drivers).

Nothing from fb_backlight.o and fbmon.o is used by the DRM fbdev emulation
layer so these two objects can be compiled out when CONFIG_FB is disabled.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230719081544.741051-4-javierm@redhat.com
arch/x86/Makefile
arch/x86/video/Makefile
drivers/video/backlight/backlight.c
drivers/video/console/Kconfig
drivers/video/fbdev/Kconfig
drivers/video/fbdev/core/Kconfig
drivers/video/fbdev/core/Makefile