diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 96d03ac38ef7..bfc4b379f0b5 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -805,10 +805,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	/* Subtract time delta from raw timestamp to get final
 	 * vblank_time timestamp for end of vblank.
 	 */
-	if (delta_ns < 0)
-		etime = ktime_add_ns(etime, -delta_ns);
-	else
-		etime = ktime_sub_ns(etime, delta_ns);
+	etime = ktime_sub_ns(etime, delta_ns);
 	*vblank_time = ktime_to_timeval(etime);
 
 	DRM_DEBUG_VBL("crtc %u : v 0x%x p(%d,%d)@ %ld.%ld -> %ld.%ld [e %d us, %d rep]\n",