diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 5d30592c83cd..d414e9eea9d8 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -657,6 +657,10 @@ set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
 		crtc->enabled = crtc->state->enable;
 		crtc->x = crtc->primary->state->src_x >> 16;
 		crtc->y = crtc->primary->state->src_y >> 16;
+
+		if (crtc->state->enable)
+			drm_calc_timestamping_constants(crtc,
+							&crtc->state->adjusted_mode);
 	}
 }