diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 126703816794..5c36c75232e6 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -771,16 +771,20 @@ nv50_msto_atomic_check(struct drm_encoder *encoder,
 	struct nv50_head_atom *asyh = nv50_head_atom(crtc_state);
 	int slots;
 
-	/* When restoring duplicated states, we need to make sure that the
-	 * bw remains the same and avoid recalculating it, as the connector's
-	 * bpc may have changed after the state was duplicated
-	 */
-	if (!state->duplicated)
-		asyh->dp.pbn =
-			drm_dp_calc_pbn_mode(crtc_state->adjusted_mode.clock,
-					     connector->display_info.bpc * 3);
+	if (crtc_state->mode_changed || crtc_state->connectors_changed) {
+		/*
+		 * When restoring duplicated states, we need to make sure that
+		 * the bw remains the same and avoid recalculating it, as the
+		 * connector's bpc may have changed after the state was
+		 * duplicated
+		 */
+		if (!state->duplicated) {
+			const int bpp = connector->display_info.bpc * 3;
+			const int clock = crtc_state->adjusted_mode.clock;
+
+			asyh->dp.pbn = drm_dp_calc_pbn_mode(clock, bpp);
+		}
 
-	if (crtc_state->mode_changed) {
 		slots = drm_dp_atomic_find_vcpi_slots(state, &mstm->mgr,
 						      mstc->port,
 						      asyh->dp.pbn);