[PATCH] drm: Clarify DRM_MODE_REFLECT_X/Y documentation

[Alexandru Gheorghe]

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.

Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe at arm.com>
---
 include/uapi/drm/drm_mode.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 8d67243952f4..ac5de85c93eb 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -186,9 +186,18 @@ 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.
  *
+ * DRM_MODE_REFLECT_X
+ * |o |    | o|
+ * |  | -> |  |
+ * | v|    |v |
+ *
+ * DRM_MODE_REFLECT_Y
+ * |o |    | ^|
+ * |  | -> |  |
+ * | v|    |o |
  * 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