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@xxxxxxx>
---
drivers/gpu/drm/drm_blend.c | 22 ++++++++++++++++++++++
include/uapi/drm/drm_mode.h | 3 ++-
2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
index 402b62d3f072..92f75c5c93ac 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
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 8d67243952f4..d3e0fe31efc5 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -186,8 +186,9 @@ extern "C" {
/*
* DRM_MODE_REFLECT_<axis>
*
- * Signals that the contents of a drm plane is reflected in the <axis> axis,
+ * Signals that the contents of a drm plane is reflected along the <axis> axis,
* in the same way as mirroring.
+ * See kerneldoc chapter "Plane Composition Properties" for more details.
*
* This define is provided as a convenience, looking up the property id
* using the name->prop id lookup is the preferred method.
--
2.18.0
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