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

1 files changed, 0 insertions, 24 deletions

diff --git a/drivers/gpu/drm/drm_nomodeset.c b/drivers/gpu/drm/drm_nomodeset.c
deleted file mode 100644
index f3978d5bd3a1..000000000000
--- a/drivers/gpu/drm/drm_nomodeset.c
+++ /dev/null
@@ -1,24 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/module.h>
-#include <linux/types.h>
-
-static bool drm_nomodeset;
-
-bool drm_firmware_drivers_only(void)
-{
-	return drm_nomodeset;
-}
-EXPORT_SYMBOL(drm_firmware_drivers_only);
-
-static int __init disable_modeset(char *str)
-{
-	drm_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);