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authorThomas Zimmermann <tzimmermann@suse.de>2022-11-11 14:30:24 +0100
committerThomas Zimmermann <tzimmermann@suse.de>2022-11-16 13:26:25 +0100
commit0ba2fa8cbd29278a180ac90bd66b2c0bbdeacc89 (patch)
tree048750c67099f42c7ae500ddbc22cdf51ba433d9 /drivers/video/fbdev/gxt4500.c
parentdrm: Move nomodeset kernel parameter to drivers/video (diff)
downloadlinux-0ba2fa8cbd29278a180ac90bd66b2c0bbdeacc89.tar.xz
linux-0ba2fa8cbd29278a180ac90bd66b2c0bbdeacc89.zip
fbdev: Add support for the nomodeset kernel parameter
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
Diffstat (limited to 'drivers/video/fbdev/gxt4500.c')
-rw-r--r--drivers/video/fbdev/gxt4500.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/fbdev/gxt4500.c b/drivers/video/fbdev/gxt4500.c
index 0dcef4bec8d7..5f42d3d9d6ce 100644
--- a/drivers/video/fbdev/gxt4500.c
+++ b/drivers/video/fbdev/gxt4500.c
@@ -779,6 +779,9 @@ static struct pci_driver gxt4500_driver = {
static int gxt4500_init(void)
{
+ if (fb_modesetting_disabled("gxt4500"))
+ return -ENODEV;
+
#ifndef MODULE
if (fb_get_options("gxt4500", &mode_option))
return -ENODEV;