drm: Consolidate plane arrays in drm_atomic_state

It's kinda pointless to have 2 separate mallocs for these. And when we
add more per-plane state in the future it's even more pointless.

Right now there's no such thing planned, but both Gustavo's per-crtc
fence patches, and some nonblocking commit helpers I'm playing around
with will add more per-crtc stuff. It makes sense to also consolidate
planes, just for consistency.

In the future we can use this to store a pointer to the preceeding
state, making an atomic update entirely free-standing. This will be
needed to be able to queue them up with a depth > 1.

Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464818821-5736-11-git-send-email-daniel.vetter@ffwll.ch
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 751990a..821398c 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1693,6 +1693,11 @@
 	void *driver_private;
 };
 
+struct __drm_planes_state {
+	struct drm_plane *ptr;
+	struct drm_plane_state *state;
+};
+
 struct __drm_connnectors_state {
 	struct drm_connector *ptr;
 	struct drm_connector_state *state;
@@ -1704,8 +1709,7 @@
  * @allow_modeset: allow full modeset
  * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
  * @legacy_set_config: Disable conflicting encoders instead of failing with -EINVAL.
- * @planes: pointer to array of plane pointers
- * @plane_states: pointer to array of plane states pointers
+ * @planes: pointer to array of structures with per-plane data
  * @crtcs: pointer to array of CRTC pointers
  * @crtc_states: pointer to array of CRTC states pointers
  * @num_connector: size of the @connectors and @connector_states arrays
@@ -1717,8 +1721,7 @@
 	bool allow_modeset : 1;
 	bool legacy_cursor_update : 1;
 	bool legacy_set_config : 1;
-	struct drm_plane **planes;
-	struct drm_plane_state **plane_states;
+	struct __drm_planes_state *planes;
 	struct drm_crtc **crtcs;
 	struct drm_crtc_state **crtc_states;
 	int num_connector;