1 files changed, 22 insertions, 0 deletions

diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
index c5e7ab9503c8..52e6870534b2 100644
--- a/include/drm/drm_plane_helper.h
+++ b/include/drm/drm_plane_helper.h
@@ -24,6 +24,17 @@
 #ifndef DRM_PLANE_HELPER_H
 #define DRM_PLANE_HELPER_H
 
+#include <drm/drm_rect.h>
+
+/*
+ * Drivers that don't allow primary plane scaling may pass this macro in place
+ * of the min/max scale parameters of the update checker function.
+ *
+ * Due to src being in 16.16 fixed point and dest being in integer pixels,
+ * 1<<16 represents no scaling.
+ */
+#define DRM_PLANE_HELPER_NO_SCALING (1<<16)
+
 /**
  * DOC: plane helpers
  *
@@ -31,6 +42,17 @@
  * planes.
  */
 
+extern int drm_plane_helper_check_update(struct drm_plane *plane,
+                                         struct drm_crtc *crtc,
+                                         struct drm_framebuffer *fb,
+                                         struct drm_rect *src,
+                                         struct drm_rect *dest,
+                                         const struct drm_rect *clip,
+                                         int min_scale,
+                                         int max_scale,
+                                         bool can_position,
+                                         bool can_update_disabled,
+                                         bool *visible);
 extern int drm_primary_helper_update(struct drm_plane *plane,
                                      struct drm_crtc *crtc,
                                      struct drm_framebuffer *fb,