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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-11 14:30:24 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-16 13:26:25 +0100 |
| commit | 0ba2fa8cbd29278a180ac90bd66b2c0bbdeacc89 (patch) | |
| tree | 048750c67099f42c7ae500ddbc22cdf51ba433d9 /drivers/staging | |
| parent | 9a758d8756daab5b8fda006e131c066336b16a32 (diff) | |
| download | linux-0ba2fa8cbd29278a180ac90bd66b2c0bbdeacc89.tar.gz | |
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/staging')
| -rw-r--r-- | drivers/staging/sm750fb/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/staging/sm750fb/sm750.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/staging/sm750fb/Kconfig b/drivers/staging/sm750fb/Kconfig index 8c0d8a873d5b..acb6c08d09dc 100644 --- a/drivers/staging/sm750fb/Kconfig +++ b/drivers/staging/sm750fb/Kconfig @@ -6,6 +6,7 @@ config FB_SM750 select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT + select VIDEO_NOMODESET help Frame buffer driver for the Silicon Motion SM750 chip with 2D accelearion and dual head support. diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c index 168ae2e9005d..effc7fcc3703 100644 --- a/drivers/staging/sm750fb/sm750.c +++ b/drivers/staging/sm750fb/sm750.c @@ -1168,6 +1168,9 @@ static int __init lynxfb_init(void) { char *option; + if (fb_modesetting_disabled("sm750fb")) + return -ENODEV; + #ifdef MODULE option = g_option; #else |