1 files changed, 8 insertions, 2 deletions

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index e6d0cd9f518e..748c72907829 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -836,12 +836,17 @@ struct drm_driver {
         /**
          * Called by vblank timestamping code.
          *
-         * Return the current display scanout position from a crtc.
+         * Return the current display scanout position from a crtc, and an
+         * optional accurate ktime_get timestamp of when position was measured.
          *
          * \param dev  DRM device.
          * \param crtc Id of the crtc to query.
          * \param *vpos Target location for current vertical scanout position.
          * \param *hpos Target location for current horizontal scanout position.
+         * \param *stime Target location for timestamp taken immediately before
+         *               scanout position query. Can be NULL to skip timestamp.
+         * \param *etime Target location for timestamp taken immediately after
+         *               scanout position query. Can be NULL to skip timestamp.
          *
          * Returns vpos as a positive number while in active scanout area.
          * Returns vpos as a negative number inside vblank, counting the number
@@ -858,7 +863,8 @@ struct drm_driver {
          *
          */
         int (*get_scanout_position) (struct drm_device *dev, int crtc,
-                                     int *vpos, int *hpos);
+                                     int *vpos, int *hpos, ktime_t *stime,
+                                     ktime_t *etime);
 
         /**
          * Called by \c drm_get_last_vbltimestamp. Should return a precise