diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 7b4f808..0ce8292 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1913,7 +1913,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags);
+				     bool in_vblank_irq);
 long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
 			     unsigned long arg);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index a1b9780..babd969 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -941,7 +941,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
  * @crtc: crtc to get the timestamp for
  * @max_error: max error
  * @vblank_time: time value
- * @flags: flags passed to the driver
+ * @in_vblank_irq: called from drm_handle_vblank()
  *
  * Gets the timestamp on the requested crtc based on the
  * scanout position.  (all asics).
@@ -950,7 +950,7 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
 bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags)
+				     bool in_vblank_irq)
 {
 	struct drm_crtc *crtc;
 	struct amdgpu_device *adev = dev->dev_private;
@@ -971,7 +971,7 @@ bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &crtc->hwmode);
 }
 
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 677b37b..fba6a84 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -54,7 +54,7 @@
 
 static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
-			  struct timeval *tvblank, unsigned flags);
+			  struct timeval *tvblank, bool in_vblank_irq);
 
 static unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
 
@@ -138,7 +138,7 @@ static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe
 	 */
 	do {
 		cur_vblank = __get_vblank_counter(dev, pipe);
-		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, 0);
+		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, false);
 	} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
 
 	/*
@@ -171,7 +171,7 @@ static void drm_reset_vblank_timestamp(struct drm_device *dev, unsigned int pipe
  * device vblank fields.
  */
 static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
-				    unsigned long flags)
+				    bool in_vblank_irq)
 {
 	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 	u32 cur_vblank, diff;
@@ -194,7 +194,7 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	 */
 	do {
 		cur_vblank = __get_vblank_counter(dev, pipe);
-		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, flags);
+		rc = drm_get_last_vbltimestamp(dev, pipe, &t_vblank, in_vblank_irq);
 	} while (cur_vblank != __get_vblank_counter(dev, pipe) && --count > 0);
 
 	if (dev->max_vblank_count != 0) {
@@ -214,13 +214,13 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 		 */
 		diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
 
-		if (diff == 0 && flags & DRM_CALLED_FROM_VBLIRQ)
+		if (diff == 0 && in_vblank_irq)
 			DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
 				      " diff_ns = %lld, framedur_ns = %d)\n",
 				      pipe, (long long) diff_ns, framedur_ns);
 	} else {
 		/* some kind of default for drivers w/o accurate vbl timestamping */
-		diff = (flags & DRM_CALLED_FROM_VBLIRQ) != 0;
+		diff = in_vblank_irq ? 1 : 0;
 	}
 
 	/*
@@ -253,7 +253,7 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	 * Otherwise reinitialize delayed at next vblank interrupt and assign 0
 	 * for now, to mark the vblanktimestamp as invalid.
 	 */
-	if (!rc && (flags & DRM_CALLED_FROM_VBLIRQ) == 0)
+	if (!rc && in_vblank_irq)
 		t_vblank = (struct timeval) {0, 0};
 
 	store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
@@ -291,7 +291,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
 
 	spin_lock_irqsave(&dev->vblank_time_lock, flags);
 
-	drm_update_vblank_count(dev, pipe, 0);
+	drm_update_vblank_count(dev, pipe, false);
 	vblank = drm_vblank_count(dev, pipe);
 
 	spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
@@ -349,7 +349,7 @@ static void vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
 	 * this time. This makes the count account for the entire time
 	 * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
 	 */
-	drm_update_vblank_count(dev, pipe, 0);
+	drm_update_vblank_count(dev, pipe, false);
 
 	spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
 }
@@ -700,9 +700,10 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
  * @max_error: Desired maximum allowable error in timestamps (nanosecs)
  *             On return contains true maximum error of timestamp
  * @vblank_time: Pointer to struct timeval which should receive the timestamp
- * @flags: Flags to pass to driver:
- *         0 = Default,
- *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
+ * @in_vblank_irq:
+ *     True when called from drm_crtc_handle_vblank().  Some drivers
+ *     need to apply some workarounds for gpu-specific vblank irq quirks
+ *     if flag is set.
  * @mode: mode which defines the scanout timings
  *
  * Implements calculation of exact vblank timestamps from given drm_display_mode
@@ -732,7 +733,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 					   unsigned int pipe,
 					   int *max_error,
 					   struct timeval *vblank_time,
-					   unsigned flags,
+					   bool in_vblank_irq,
 					   const struct drm_display_mode *mode)
 {
 	struct timeval tv_etime;
@@ -740,6 +741,7 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	unsigned int vbl_status;
 	int vpos, hpos, i;
 	int delta_ns, duration_ns;
+	unsigned flags = in_vblank_irq ? DRM_CALLED_FROM_VBLIRQ : 0;
 
 	if (pipe >= dev->num_crtcs) {
 		DRM_ERROR("Invalid crtc %u\n", pipe);
@@ -843,9 +845,10 @@ static struct timeval get_drm_timestamp(void)
  * @dev: DRM device
  * @pipe: index of CRTC whose vblank timestamp to retrieve
  * @tvblank: Pointer to target struct timeval which should receive the timestamp
- * @flags: Flags to pass to driver:
- *         0 = Default,
- *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
+ * @in_vblank_irq:
+ *     True when called from drm_crtc_handle_vblank().  Some drivers
+ *     need to apply some workarounds for gpu-specific vblank irq quirks
+ *     if flag is set.
  *
  * Fetches the system timestamp corresponding to the time of the most recent
  * vblank interval on specified CRTC. May call into kms-driver to
@@ -859,7 +862,7 @@ static struct timeval get_drm_timestamp(void)
  */
 static bool
 drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
-			  struct timeval *tvblank, unsigned flags)
+			  struct timeval *tvblank, bool in_vblank_irq)
 {
 	bool ret = false;
 
@@ -869,7 +872,7 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
 	/* Query driver if possible and precision timestamping enabled. */
 	if (dev->driver->get_vblank_timestamp && (max_error > 0))
 		ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
-							tvblank, flags);
+							tvblank, in_vblank_irq);
 
 	/* GPU high precision timestamp query unsupported or failed.
 	 * Return current monotonic/gettimeofday timestamp as best estimate.
@@ -1747,7 +1750,7 @@ bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe)
 		return false;
 	}
 
-	drm_update_vblank_count(dev, pipe, DRM_CALLED_FROM_VBLIRQ);
+	drm_update_vblank_count(dev, pipe, true);
 
 	spin_unlock(&dev->vblank_time_lock);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 315e687..ae09c29 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -967,7 +967,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
 static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 			      int *max_error,
 			      struct timeval *vblank_time,
-			      unsigned flags)
+			      bool in_vblank_irq)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc *crtc;
@@ -991,7 +991,7 @@ static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &crtc->base.hwmode);
 }
 
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index ffeb34b..07e2b13 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -595,7 +595,7 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
 static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 				      int *max_error,
 				      struct timeval *vblank_time,
-				      unsigned flags)
+				      bool in_vblank_irq)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct drm_crtc *crtc;
@@ -612,7 +612,7 @@ static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 	}
 
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &crtc->mode);
 }
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index f1e36f7..2d28ef5 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -158,7 +158,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
 
 bool
 nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
-			 int *max_error, struct timeval *time, unsigned flags)
+			 int *max_error, struct timeval *time, bool in_vblank_irq)
 {
 	struct drm_crtc *crtc;
 
@@ -170,7 +170,8 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
 			else
 				mode = &crtc->hwmode;
 			return drm_calc_vbltimestamp_from_scanoutpos(dev,
-					pipe, max_error, time, flags, mode);
+					pipe, max_error, time, in_vblank_irq,
+					mode);
 		}
 	}
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index c6bfe53..8ec8625 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -72,7 +72,7 @@ int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
 				unsigned int, int *, int *, ktime_t *,
 				ktime_t *, const struct drm_display_mode *);
 bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
-			       struct timeval *, unsigned);
+			       struct timeval *, bool);
 
 int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 			    struct drm_pending_vblank_event *event,
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index caa0b1c..88fc791 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -118,7 +118,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
 bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags);
+				     bool in_vblank_irq);
 void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
 int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
 void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 535969d..5bccdea 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -874,7 +874,7 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
 bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags)
+				     bool in_vblank_irq)
 {
 	struct drm_crtc *drmcrtc;
 	struct radeon_device *rdev = dev->dev_private;
@@ -891,7 +891,7 @@ bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &drmcrtc->hwmode);
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index f506525..6ed53d2 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -272,14 +272,14 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 
 bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
 				  int *max_error, struct timeval *vblank_time,
-				  unsigned flags)
+				  bool in_vblank_irq)
 {
 	struct drm_crtc *crtc = drm_crtc_from_index(dev, crtc_id);
 	struct drm_crtc_state *state = crtc->state;
 
 	/* Helper routine in DRM core does all the work: */
 	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc_id, max_error,
-						     vblank_time, flags,
+						     vblank_time, in_vblank_irq,
 						     &state->adjusted_mode);
 }
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index d1c53a5..d192f7e 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -495,7 +495,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
 			    const struct drm_display_mode *mode);
 bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
 				  int *max_error, struct timeval *vblank_time,
-				  unsigned flags);
+				  bool in_vblank_irq);
 
 /* vc4_debugfs.c */
 int vc4_debugfs_init(struct drm_minor *minor);
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index da78e24..a97dbc1 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -241,8 +241,10 @@ struct drm_driver {
 	 *     DRM device.
 	 * pipe:
 	 *     Id of the crtc to query.
-	 * flags:
-	 *     Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
+	 * in_vblank_irq:
+	 *     True when called from drm_crtc_handle_vblank().  Some drivers
+	 *     need to apply some workarounds for gpu-specific vblank irq quirks
+	 *     if flag is set.
 	 * vpos:
 	 *     Target location for current vertical scanout position.
 	 * hpos:
@@ -308,11 +310,10 @@ struct drm_driver {
 	 *     Returns true upper bound on error for timestamp.
 	 * vblank_time:
 	 *     Target location for returned vblank timestamp.
-	 * flags:
-	 *     0 = Defaults, no special treatment needed.
-	 *     DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
-	 *     irq handler. Some drivers need to apply some workarounds
-	 *     for gpu-specific vblank irq quirks if flag is set.
+	 * in_vblank_irq:
+	 *     True when called from drm_crtc_handle_vblank().  Some drivers
+	 *     need to apply some workarounds for gpu-specific vblank irq quirks
+	 *     if flag is set.
 	 *
 	 * Returns:
 	 *
@@ -322,7 +323,7 @@ struct drm_driver {
 	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
 				     int *max_error,
 				     struct timeval *vblank_time,
-				     unsigned flags);
+				     bool in_vblank_irq);
 
 	/* these have to be filled in */
 
diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
index f0d5ccf..445406e 100644
--- a/include/drm/drm_irq.h
+++ b/include/drm/drm_irq.h
@@ -156,7 +156,7 @@ u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
 bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 					   unsigned int pipe, int *max_error,
 					   struct timeval *vblank_time,
-					   unsigned flags,
+					   bool in_vblank_irq,
 					   const struct drm_display_mode *mode);
 void drm_calc_timestamping_constants(struct drm_crtc *crtc,
 				     const struct drm_display_mode *mode);