+
+/**
+ * drm_plane_helper_atomic_check() - Helper to check plane atomic-state
+ * @plane: plane to check
+ * @state: atomic state object
+ *
+ * Provides a default plane-state check handler for planes whose atomic-state
+ * scale and positioning are not expected to change since the plane is always
+ * a fullscreen scanout buffer.
+ *
+ * This is often the case for the primary plane of simple framebuffers.
+ *
+ * RETURNS:
+ * Zero on success, or an errno code otherwise.
+ */
+int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state)
+{
+ struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+ struct drm_crtc *new_crtc = new_plane_state->crtc;
+ struct drm_crtc_state *new_crtc_state = NULL;
+
+ if (new_crtc)
+ new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+ return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+ DRM_PLANE_NO_SCALING,
+ DRM_PLANE_NO_SCALING,
+ false, false);
+}
+EXPORT_SYMBOL(drm_plane_helper_atomic_check);