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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-11 14:30:23 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-16 13:26:12 +0100 |
| commit | 9a758d8756daab5b8fda006e131c066336b16a32 (patch) | |
| tree | 453f3eeffd5bbd66a22124082738d9473b61f4ab /drivers/video | |
| parent | 27c3e9452d552ea86369a94f23287a9675f2d7a1 (diff) | |
| download | linux-9a758d8756daab5b8fda006e131c066336b16a32.tar.gz linux-9a758d8756daab5b8fda006e131c066336b16a32.tar.bz2 linux-9a758d8756daab5b8fda006e131c066336b16a32.zip | |
drm: Move nomodeset kernel parameter to drivers/video
Move the nomodeset kernel parameter to drivers/video to make it
available to non-DRM drivers. Adapt the interface, but keep the DRM
interface drm_firmware_drivers_only() to avoid churn within DRM. The
function should later be inlined into callers.
The parameter disables any DRM graphics driver that would replace a
driver for firmware-provided scanout buffers. It is an option to easily
fallback to basic graphics output if the hardware's native driver is
broken. Moving it to a more prominent location wil make it available
to fbdev as well.
v2:
* clarify the meaning of the nomodeset parameter (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221111133024.9897-2-tzimmermann@suse.de
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/video/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/nomodeset.c | 26 |
3 files changed, 31 insertions, 0 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 0587e21abad9..6d2fde6c5d11 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -11,6 +11,10 @@ config APERTURE_HELPERS Support tracking and hand-over of aperture ownership. Required by graphics drivers for firmware-provided framebuffers. +config VIDEO_NOMODESET + bool + default n + if HAS_IOMEM config HAVE_FB_ATMEL diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 5bb6b452cc83..a50eb528ed3c 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_APERTURE_HELPERS) += aperture.o obj-$(CONFIG_VGASTATE) += vgastate.o +obj-$(CONFIG_VIDEO_NOMODESET) += nomodeset.o obj-$(CONFIG_HDMI) += hdmi.o obj-$(CONFIG_VT) += console/ diff --git a/drivers/video/nomodeset.c b/drivers/video/nomodeset.c new file mode 100644 index 000000000000..13cc8b719697 --- /dev/null +++ b/drivers/video/nomodeset.c @@ -0,0 +1,26 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/module.h> +#include <linux/types.h> + +#include <video/nomodeset.h> + +static bool video_nomodeset; + +bool video_firmware_drivers_only(void) +{ + return video_nomodeset; +} +EXPORT_SYMBOL(video_firmware_drivers_only); + +static int __init disable_modeset(char *str) +{ + video_nomodeset = true; + + pr_warn("Booted with the nomodeset parameter. Only the system framebuffer will be available\n"); + + return 1; +} + +/* Disable kernel modesetting */ +__setup("nomodeset", disable_modeset); |