gpu/drm/drm_vblank.c

46  * a new frame the scanout engine has "scanned out" the display image
400  * This is mostly useful for hardware that can obtain the scanout position, but
600  * @mode: display mode containing the scanout timings
605  * CRTC's true scanout timing, so they take things like panel scaling or
636 		 * Fields of interlaced scanout modes are only half a frame duration.  in drm_calc_timestamping_constants()
670  *     Callback function to retrieve the scanout position. See
674  * timings and current video scanout position of a CRTC.
679  * match the scanout position reported.
711 	/* Scanout position query not supported? Should not happen. */  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
732 	/* Get current scanout position with system timestamp.  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
741 		 * Get vertical and horizontal scanout position vpos, hpos,  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
749 		/* Return as no-op if scanout query unsupported or failed. */  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
757 		/* Compute uncertainty in timestamp of scanout position query. */  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
775 	/* Convert scanout position into elapsed time at raw_time query  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
776 	 * since start of scanout at first display scanline. delta_ns  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
777 	 * can be negative if start of scanout hasn't happened yet.  in drm_crtc_vblank_helper_get_vblank_timestamp_internal()
817  * timings and current video scanout position of a CRTC. This can be directly
824  * match the scanout position reported.