drm: Allow drivers to register cursor planes with crtc

Universal plane support had placeholders for cursor planes, but didn't
actually do anything with them.  Save the cursor plane reference inside
the crtc and update the cursor plane parameter from void* to drm_plane.
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NMatt Roper <matthew.d.roper@intel.com>
Reviewed-by: Pallavi G<pallavi.g@intel.com>
Acked-by: NDave Airlie <airlied@linux.ie>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_crtc.c

@@ -727,7 +727,7 @@ DEFINE_WW_CLASS(crtc_ww_class);
  */
 int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 			      struct drm_plane *primary,
-			      void *cursor,
+			      struct drm_plane *cursor,
 			      const struct drm_crtc_funcs *funcs)
 {
 	struct drm_mode_config *config = &dev->mode_config;
@@ -752,8 +752,11 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 	config->num_crtc++;
 
 	crtc->primary = primary;
+	crtc->cursor = cursor;
 	if (primary)
 		primary->possible_crtcs = 1 << drm_crtc_index(crtc);
+	if (cursor)
+		cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
 
  out:
 	drm_modeset_unlock_all(dev);

include/drm/drm_crtc.h

@@ -856,7 +856,7 @@ struct drm_prop_enum_list {
 extern int drm_crtc_init_with_planes(struct drm_device *dev,
 				     struct drm_crtc *crtc,
 				     struct drm_plane *primary,
-				     void *cursor,
+				     struct drm_plane *cursor,
 				     const struct drm_crtc_funcs *funcs);
 extern int drm_crtc_init(struct drm_device *dev,
 			 struct drm_crtc *crtc,