drm/vmwgfx: Plane atomic state

Add plane state handling functions.

We have to keep track of a few plane states so we cannot use the
DRM helper for this.

Created vmw_plane_state along with functions to reset, duplicate,
and destroty it.

v2
* Removed cursor clean up special case

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Daniel Vetter <daniel@ffwll.ch>

drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c

@@ -1090,12 +1090,18 @@ static const struct drm_plane_funcs vmw_stdu_plane_funcs = {
 	.update_plane = drm_primary_helper_update,
 	.disable_plane = drm_primary_helper_disable,
 	.destroy = vmw_du_primary_plane_destroy,
+	.reset = vmw_du_plane_reset,
+	.atomic_duplicate_state = vmw_du_plane_duplicate_state,
+	.atomic_destroy_state = vmw_du_plane_destroy_state,
 };
 
 static const struct drm_plane_funcs vmw_stdu_cursor_funcs = {
 	.update_plane = vmw_du_cursor_plane_update,
 	.disable_plane = vmw_du_cursor_plane_disable,
 	.destroy = vmw_du_cursor_plane_destroy,
+	.reset = vmw_du_plane_reset,
+	.atomic_duplicate_state = vmw_du_plane_duplicate_state,
+	.atomic_destroy_state = vmw_du_plane_destroy_state,
 };
 
 
@@ -1142,6 +1148,8 @@ static int vmw_stdu_init(struct vmw_private *dev_priv, unsigned unit)
 	stdu->base.is_implicit = false;
 
 	/* Initialize primary plane */
+	vmw_du_plane_reset(primary);
+
 	ret = drm_universal_plane_init(dev, primary,
 				       0, &vmw_stdu_plane_funcs,
 				       vmw_primary_plane_formats,
@@ -1153,6 +1161,8 @@ static int vmw_stdu_init(struct vmw_private *dev_priv, unsigned unit)
 	}
 
 	/* Initialize cursor plane */
+	vmw_du_plane_reset(cursor);
+
 	ret = drm_universal_plane_init(dev, cursor,
 			0, &vmw_stdu_cursor_funcs,
 			vmw_cursor_plane_formats,