39 /* Access macro for slots in vblank timestamp ringbuffer. */
44 /* Retry timestamp calculation up to 3 times to satisfy
82  * Clear vblank timestamp buffer for a crtc.
115 	 * vblank timestamp, repeat until they are consistent.  in vblank_disable_and_save()
133 	/* Compute time difference to stored timestamp of last vblank  in vblank_disable_and_save()
141 	 * timestamp and tvblank, then we are currently executing our  in vblank_disable_and_save()
142 	 * disable inside a new vblank interval, the tvblank timestamp  in vblank_disable_and_save()
148 	 * Skip this step if there isn't any high precision timestamp  in vblank_disable_and_save()
252 	DRM_INFO("Supports vblank timestamp caching Rev 1 (10.10.2010).\n");  in drm_vblank_init()
256 		DRM_INFO("Driver supports precise vblank timestamp query.\n");  in drm_vblank_init()
258 		DRM_INFO("No driver support for vblank timestamp query.\n");  in drm_vblank_init()
455  * @crtc drm_crtc whose timestamp constants should be updated.
507  * extension specification. The timestamp corresponds to the end of
520  * @crtc: Which crtc's vblank timestamp to retrieve.
522  *             On return contains true maximum error of timestamp.
523  * @vblank_time: Pointer to struct timeval which should receive the timestamp.
540  * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
584 	/* Get current scanout position with system timestamp.  in drm_calc_vbltimestamp_from_scanoutpos()
597 		/* Get system timestamp before query. */  in drm_calc_vbltimestamp_from_scanoutpos()
603 		/* Get system timestamp after query. */  in drm_calc_vbltimestamp_from_scanoutpos()
628 		DRM_DEBUG("crtc %d: Noisy timestamp %d us > %d us [%d reps].\n",  in drm_calc_vbltimestamp_from_scanoutpos()
632 	/* Return upper bound of timestamp precision error. */  in drm_calc_vbltimestamp_from_scanoutpos()
653 	 * by adding a full frame duration to the final timestamp.  in drm_calc_vbltimestamp_from_scanoutpos()
673 	/* Subtract time delta from raw timestamp to get final  in drm_calc_vbltimestamp_from_scanoutpos()
674 	 * vblank_time timestamp for end of vblank.  in drm_calc_vbltimestamp_from_scanoutpos()
705  * drm_get_last_vbltimestamp - retrieve raw timestamp for the most recent
709  * @crtc: which crtc's vblank timestamp to retrieve
710  * @tvblank: Pointer to target struct timeval which should receive the timestamp
715  * Fetches the system timestamp corresponding to the time of the most recent
717  * compute the timestamp with a high-precision GPU specific method.
719  * Returns zero if timestamp originates from uncorrected do_gettimeofday()
722  * Returns non-zero if timestamp is considered to be very precise.
740 	/* GPU high precision timestamp query unsupported or failed.  in drm_get_last_vbltimestamp()
741 	 * Return current monotonic/gettimeofday timestamp as best estimate.  in drm_get_last_vbltimestamp()
766  * and the system timestamp corresponding to that vblank counter value.
770  * @vblanktime: Pointer to struct timeval to receive the vblank timestamp.
774  * modesetting activity. Returns corresponding system timestamp of the time
783 	/* Read timestamp from slot of _vblank_time ringbuffer  in drm_vblank_count_and_time()
820  * Updates sequence # and timestamp on event, and sends it to userspace.
867 	 * We repeat the hardware vblank counter & timestamp query until  in drm_update_vblank_count()
870 	 * corresponding vblank timestamp.  in drm_update_vblank_count()
889 	/* Reinitialize corresponding vblank timestamp if high-precision query  in drm_update_vblank_count()
924 			 * All vblank count & timestamp updates are held off  in drm_vblank_get()
1348 	/* Need timestamp lock to prevent concurrent execution with  in drm_handle_vblank()
1360 	/* Fetch corresponding timestamp for this vblank interval from  in drm_handle_vblank()
1361 	 * driver and store it in proper slot of timestamp ringbuffer.  in drm_handle_vblank()
1364 	/* Get current timestamp and count. */  in drm_handle_vblank()
1368 	/* Compute time difference to timestamp of last vblank */  in drm_handle_vblank()
1372 	/* Update vblank timestamp and count if at least  in drm_handle_vblank()
1374 	 * difference between last stored timestamp and current  in drm_handle_vblank()
1375 	 * timestamp. A smaller difference means basically  in drm_handle_vblank()
1382 		/* Store new timestamp in ringbuffer. */  in drm_handle_vblank()
1386 		 * the timestamp computed above.  in drm_handle_vblank()