linux/Documentation/fb
Rolf Eike Beer 04fee895ef DRM: clean up and document parsing of video= parameter
The video= parameter of the DRM drivers supports some additional flags that
the normal fb drivers do not have. They also allow to limit these flags to
specific outputs. Both things were previously undocumented.

Also the parsing of the line had some oddities:
-A lot of misplaced options were silently ignored or partly rejected instead
 of stopping the parsing immediately
-The 'R' option is documented to follow the 'M' option if specified. It is not
 documented that 'M' is needed to specify 'R' (also this is the case for normal
 fb drivers). In fact the code is correct for normal fb drivers but wrong for
 DRM ones.
 The old code allowed 'R' only _before_ 'M' (since it parses backwards) and only
 if 'M' is given at all which is not needed for the DRM drivers.
-the margins option ('m') was parsed but later ignored even if the later
 functions support it.
-specifying multiple enable options at the same time did not lead to an error.
-specifying something bogus for horizontal resolution (i.e. other things as
 digits) did not lead to an error but an invalid resolution was used.

If any errors are encountered the position of the faulting string is now
printed to the user and the complete mode is ignored. This gives much
more consistent error behaviour.

I also removed some useless assignments and changed the local flag variables
to be bool.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-07-25 12:02:26 +01:00
..
00-INDEX fbdev: Update documentation index file. 2010-11-18 15:01:54 +09:00
arkfb.txt
aty128fb.txt
cirrusfb.txt
cmap_xfbdev.txt
deferred_io.txt
efifb.txt
ep93xx-fb.txt
fbcon.txt
framebuffer.txt
gxfb.txt
intel810.txt
intelfb.txt
internals.txt
lxfb.txt
matroxfb.txt
metronomefb.txt
modedb.txt DRM: clean up and document parsing of video= parameter 2011-07-25 12:02:26 +01:00
pvr2fb.txt
pxafb.txt
s3fb.txt
sa1100fb.txt
sh7760fb.txt
sisfb.txt
sm501.txt video, sm501: add edid and commandline support 2011-03-22 17:17:00 +09:00
sstfb.txt
tgafb.txt
tridentfb.txt
udlfb.txt fbdev: move udlfb out of staging. 2010-11-16 14:00:24 +09:00
uvesafb.txt
vesafb.txt
viafb.modes
viafb.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
vt8623fb.txt