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| author | Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com> | 2018-09-10 19:29:46 +0200 |
|---|---|---|
| committer | Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com> | 2018-09-11 12:21:30 +0200 |
| commit | 1f86fa15340e77c68a50d3a1ddeaaa6056089875 (patch) | |
| tree | e7760a3ffbaa5d5e472f7f9ed7993507eed5261c /drivers/gpu/drm/drm_blend.c | |
| parent | drm: Remove set but not used variable 'config' (diff) | |
| download | linux-1f86fa15340e77c68a50d3a1ddeaaa6056089875.tar.xz linux-1f86fa15340e77c68a50d3a1ddeaaa6056089875.zip | |
drm: Clarify DRM_MODE_REFLECT_X/Y documentation
DRM_MODE_REFLECT_X and DRM_MODE_REFLECT_Y meaning seems a bit unclear
to me, so try to clarify that with a bit of ascii graphics.
Changes since v1:
- Move the ascii graphics in the kerneldoc where all plane
properties are already documented and make sure it's properly
rendered, suggestested by Daniel Vetter.
Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180910172946.18539-1-alexandru-cosmin.gheorghe@arm.com
Diffstat (limited to 'drivers/gpu/drm/drm_blend.c')
| -rw-r--r-- | drivers/gpu/drm/drm_blend.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c index 402b62d3f072..0c78ca386cbe 100644 --- a/drivers/gpu/drm/drm_blend.c +++ b/drivers/gpu/drm/drm_blend.c @@ -101,6 +101,28 @@ * Without this property the rectangle is only scaled, but not rotated or * reflected. * + * Possbile values: + * + * "rotate-<degrees>": + * Signals that a drm plane is rotated <degrees> degrees in counter + * clockwise direction. + * + * "reflect-<axis>": + * Signals that the contents of a drm plane is reflected along the + * <axis> axis, in the same way as mirroring. + * + * reflect-x:: + * + * |o | | o| + * | | -> | | + * | v| |v | + * + * reflect-y:: + * + * |o | | ^| + * | | -> | | + * | v| |o | + * * zpos: * Z position is set up with drm_plane_create_zpos_immutable_property() and * drm_plane_create_zpos_property(). It controls the visibility of overlapping |