1 files changed, 2 insertions, 1 deletions

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 46bf8ae7e302..3f57c77acef8 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1401,7 +1401,8 @@ extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
                                                  int crtc, int *max_error,
                                                  struct timeval *vblank_time,
                                                  unsigned flags,
-                                                 struct drm_crtc *refcrtc);
+                                                 const struct drm_crtc *refcrtc,
+                                                 const struct drm_display_mode *mode);
 extern void drm_calc_timestamping_constants(struct drm_crtc *crtc,
                                             const struct drm_display_mode *mode);