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| author | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-06-19 12:17:51 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-06-19 12:17:51 +0200 |
| commit | 1bf4e09227c345e246062285eba4b8fe660e512e (patch) | |
| tree | 45396ee8fa752b77e08db4c2ae3be1f1c21dab2b /Documentation/fb | |
| parent | 3aeeb13d899627fe2b86bdbdcd0927cf7192234f (diff) | |
drm/modes: Allow to specify rotation and reflection on the commandline
Rotations and reflections setup are needed in some scenarios to initialise
properly the initial framebuffer. Some drivers already had a bunch of
quirks to deal with this, such as either a private kernel command line
parameter (omapdss) or on the device tree (various panels).
In order to accomodate this, let's create a video mode parameter to deal
with the rotation and reflexion.
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/777da16e42db757c1f5b414b5ca34507097fed5c.1560783090.git-series.maxime.ripard@bootlin.com
Diffstat (limited to 'Documentation/fb')
| -rw-r--r-- | Documentation/fb/modedb.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/fb/modedb.txt b/Documentation/fb/modedb.txt index 16aa08453911..52418c6dbfc4 100644 --- a/Documentation/fb/modedb.txt +++ b/Documentation/fb/modedb.txt @@ -51,6 +51,18 @@ To force the VGA output to be enabled and drive a specific mode say: Specifying the option multiple times for different ports is possible, e.g.: video=LVDS-1:d video=HDMI-1:D +Options can also be passed after the mode, using commas as separator. + + Sample usage: 720x480,rotate=180 - 720x480 mode, rotated by 180 degrees + +Valid options are: + + - reflect_x (boolean): Perform an axial symmetry on the X axis + - reflect_y (boolean): Perform an axial symmetry on the Y axis + - rotate (integer): Rotate the initial framebuffer by x + degrees. Valid values are 0, 90, 180 and 270. + + ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** What is the VESA(TM) Coordinated Video Timings (CVT)? |