diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 97c70642dbe1..c0c3f2006203 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1826,6 +1826,7 @@ EXPORT_SYMBOL(drm_crtc_handle_vblank);
  */
 u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
 {
+	WARN_ON_ONCE(dev->max_vblank_count != 0);
 	return 0;
 }
 EXPORT_SYMBOL(drm_vblank_no_hw_counter);