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-rw-r--r--drivers/gpu/drm/drm_blend.c22
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