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authorDave Airlie <airlied@redhat.com>2016-11-07 09:37:09 +1000
committerDave Airlie <airlied@redhat.com>2016-11-07 09:37:09 +1000
commit7b624ad8fea1be7ff4c22643e212191aa6a2a3c2 (patch)
tree41d0357d3259868cd85521c3fb9578cd2fc13831 /include/drm/drm_plane.h
parentdc345c46774bc150ab852d2c74ee6542de438d46 (diff)
parentbc33b0ca11e3df467777a4fa7639ba488c9d4911 (diff)
downloadlinux-7b624ad8fea1be7ff4c22643e212191aa6a2a3c2.tar.bz2
Backmerge tag 'v4.9-rc4' into drm-next
Linux 4.9-rc4 This is needed for nouveau development.
Diffstat (limited to 'include/drm/drm_plane.h')
-rw-r--r--include/drm/drm_plane.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index c5e8a0df1623..0bed92c5dbd8 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -47,8 +47,14 @@ struct drm_crtc;
* @src_h: height of visible portion of plane (in 16.16)
* @rotation: rotation of the plane
* @zpos: priority of the given plane on crtc (optional)
+ * Note that multiple active planes on the same crtc can have an identical
+ * zpos value. The rule to solving the conflict is to compare the plane
+ * object IDs; the plane with a higher ID must be stacked on top of a
+ * plane with a lower ID.
* @normalized_zpos: normalized value of zpos: unique, range from 0 to N-1
- * where N is the number of active planes for given crtc
+ * where N is the number of active planes for given crtc. Note that
+ * the driver must call drm_atomic_normalize_zpos() to update this before
+ * it can be trusted.
* @src: clipped source coordinates of the plane (in 16.16)
* @dst: clipped destination coordinates of the plane
* @visible: visibility of the plane