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authorOlaf Hering <olaf@aepfle.de>2013-12-15 21:40:35 +0100
committerTomi Valkeinen <tomi.valkeinen@ti.com>2014-01-17 09:57:45 +0100
commitf5d2b7c28b67d627646b6a0142bc201a7b1516b0 (patch)
tree10e5edbae34ddaac67a90d37161442688a813546 /drivers/video
parentvideo: vgacon: Don't build on arm64 (diff)
downloadlinux-f5d2b7c28b67d627646b6a0142bc201a7b1516b0.tar.xz
linux-f5d2b7c28b67d627646b6a0142bc201a7b1516b0.zip
fbmem: really support wildcard video=options for all fbdev drivers
Documentation/fb/modedb.txt states that video=option should be considered a global option. But video_setup and fb_get_options are not coded that way. Instead its required to boot with video=driver:option to set a given option in drvier. This is cumbersome because it requires to know in advance which driver will be active for a given board/kernel. The following patch implements the documented catchall for the fbdev drivers. It is now possible to boot with video=XxY without the need to know the active driver in advance. The specific case it tries to fix is syslinux in the SUSE installer which offers a menu to set a display resolution. Right now this just appends the vga= option the kernel. But in addition to vga= it should be possible to pass a generic video=XxY for all framebuffer/drm drivers. With this change forcing a certain window size of VM displays is now much easier. Today the video= option is stored in a global fb_mode_option. But unfortunately only drm uses it. Note: this change introduces a small memleak if video=option is actually used because fb_mode_option is const. Most drivers use strsep to get to individual options. This could be fixed in a followup patch which always releases the option string in every caller of fb_get_options. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbmem.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 010d19105ebc..cde461932760 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1930,6 +1930,9 @@ int fb_get_options(const char *name, char **option)
options = opt + name_len + 1;
}
}
+ /* No match, pass global option */
+ if (!options && option && fb_mode_option)
+ options = kstrdup(fb_mode_option, GFP_KERNEL);
if (options && !strncmp(options, "off", 3))
retval = 1;