path: root/Documentation/fb
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authorHans de Goede <>2019-11-18 16:51:30 +0100
committerHans de Goede <>2019-12-16 12:13:18 +0100
commit4e7a4a6fbdc669c44e6079f9d5eb25673749455f (patch)
treea57a8b9358aacedc5b4ad7d07519c4fef882f666 /Documentation/fb
parent7b1cce760afe38b40f0989cdf10b2190dccf9815 (diff)
drm/modes: parse_cmdline: Add support for specifying panel_orientation (v2)
Sometimes we want to override a connector's panel_orientation from the kernel commandline. Either for testing and for special cases, e.g. a kiosk like setup which uses a TV mounted in portrait mode. Users can already specify a "rotate" option through a video= kernel cmdline option. But that only supports 0/180 degrees (see drm_client_modeset TODO) and only works for in kernel modeset clients, not for userspace kms users. The "panel-orientation" connector property OTOH does support 90/270 degrees as it leaves dealing with the rotation up to userspace and this does work for userspace kms clients (at least those which support this property). Changes in v2: -Add missing ':' after @panel_orientation (reported by kbuild test robot) BugLink: Acked-by: Maxime Ripard <> Signed-off-by: Hans de Goede <> Link:
Diffstat (limited to 'Documentation/fb')
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/fb/modedb.rst b/Documentation/fb/modedb.rst
index 9c4e3fd39e6d..624d08fd2856 100644
--- a/Documentation/fb/modedb.rst
+++ b/Documentation/fb/modedb.rst
@@ -65,6 +65,9 @@ Valid options are::
- 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.
+ - panel_orientation, one of "normal", "upside_down", "left_side_up", or
+ "right_side_up". For KMS drivers only, this sets the "panel orientation"
+ property on the kms connector as hint for kms users.