linux/drivers/video/nomodeset.c
Thomas Zimmermann 9a758d8756 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
2022-11-16 13:26:12 +01:00

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C

// 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);