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fbdev: Add support for the nomodeset kernel parameter

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Support the kernel's nomodeset parameter for all PCI-based fbdev
drivers that use aperture helpers to remove other, hardware-agnostic
graphics drivers.

The parameter is a simple way of using the firmware-provided scanout
buffer if the hardware's native driver is broken. The same effect
could be achieved with per-driver options, but the importance of the
graphics output for many users makes a single, unified approach
worthwhile.

With nomodeset specified, the fbdev driver module will not load. This
unifies behavior with similar DRM drivers. In DRM helpers, modules
first check the nomodeset parameter before registering the PCI
driver. As fbdev has no such module helpers, we have to modify each
driver individually.

The name 'nomodeset' is slightly misleading, but has been chosen for
historical reasons. Several drivers implemented it before it became a
general option for DRM. So keeping the existing name was preferred over
introducing a new one.

v2:
	* print a warning if a driver does not init (Helge)
	* wrap video_firmware_drivers_only() in helper

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221111133024.9897-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2022-11-11 14:30:24 +01:00
parent 9a758d8756
commit 0ba2fa8cbd
47 changed files with 246 additions and 2 deletions
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3
drivers/video/fbdev/geode/Kconfig
View File

@@ -15,6 +15,7 @@ config FB_GEODE_LX
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
select VIDEO_NOMODESET
help
Framebuffer driver for the display controller integrated into the
AMD Geode LX processors.
@@ -30,6 +31,7 @@ config FB_GEODE_GX
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
select VIDEO_NOMODESET
help
Framebuffer driver for the display controller integrated into the
AMD Geode GX processors.
@@ -45,6 +47,7 @@ config FB_GEODE_GX1
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
select VIDEO_NOMODESET
help
Framebuffer driver for the display controller integrated into the
AMD Geode GX1 processor.