[RFC 3/4] drm: use raw time in drm_calc_vbltimestamp_from_scanoutpos

[Imre Deak <imre.deak@intel.com>]

The timestamp is used here for handling the timeout case, so we don't
want it to be affected by time adjustments.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/drm_irq.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 77f6577..5e42981 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -576,7 +576,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
 					  unsigned flags,
 					  struct drm_crtc *refcrtc)
 {
-	struct timeval stime, raw_time;
+	struct timespec raw_stime, raw_etime, real_etime;
 	struct drm_display_mode *mode;
 	int vbl_status, vtotal, vdisplay;
 	int vpos, hpos, i;
@@ -625,13 +625,13 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
 		preempt_disable();
 
 		/* Get system timestamp before query. */
-		do_gettimeofday(&stime);
+		getrawmonotonic(&raw_stime);
 
 		/* Get vertical and horizontal scanout pos. vpos, hpos. */
 		vbl_status = dev->driver->get_scanout_position(dev, crtc, &vpos, &hpos);
 
 		/* Get system timestamp after query. */
-		do_gettimeofday(&raw_time);
+		getnstime_raw_and_real(&raw_etime, &real_etime);
 
 		preempt_enable();
 
@@ -642,7 +642,8 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
 			return -EIO;
 		}
 
-		duration_ns = timeval_to_ns(&raw_time) - timeval_to_ns(&stime);
+		duration_ns = timespec_to_ns(&raw_etime) -
+			      timespec_to_ns(&raw_stime);
 
 		/* Accept result with <  max_error nsecs timing uncertainty. */
 		if (duration_ns <= (s64) *max_error)
@@ -692,11 +693,11 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
 	/* Subtract time delta from raw timestamp to get final
 	 * vblank_time timestamp for end of vblank.
 	 */
-	*vblank_time = ns_to_timeval(timeval_to_ns(&raw_time) - delta_ns);
+	*vblank_time = ns_to_timeval(timeval_to_ns(&real_time) - delta_ns);
 
 	DRM_DEBUG("crtc %d : v %d p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",
 		  crtc, (int)vbl_status, hpos, vpos,
-		  (long)raw_time.tv_sec, (long)raw_time.tv_usec,
+		  (long)raw_stime.tv_sec, (long)raw_stime.tv_nsec / 1000,
 		  (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
 		  (int)duration_ns/1000, i);
 
-- 
1.7.9.5