diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index a3f9430493ae..00608d8cef50 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -13910,18 +13910,6 @@ static void intel_crtc_check_fastset(const struct intel_crtc_state *old_crtc_sta
 	new_crtc_state->uapi.mode_changed = false;
 	new_crtc_state->update_pipe = true;
 
-	/*
-	 * If we're not doing the full modeset we want to
-	 * keep the current M/N values as they may be
-	 * sufficiently different to the computed values
-	 * to cause problems.
-	 *
-	 * FIXME: should really copy more fuzzy state here
-	 */
-	new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
-	new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
-	new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
-	new_crtc_state->has_drrs = old_crtc_state->has_drrs;
 }
 
 static int intel_crtc_add_planes_to_state(struct intel_atomic_state *state,
@@ -14032,6 +14020,105 @@ static int intel_atomic_check_crtcs(struct intel_atomic_state *state)
 	return 0;
 }
 
+static void
+intel_dp_modeset_synced_crtcs(struct intel_atomic_state *state)
+{
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_crtc *crtc;
+	int i;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					 new_crtc_state, i) {
+		if (is_trans_port_sync_mode(new_crtc_state)) {
+			new_crtc_state->uapi.mode_changed = true;
+			new_crtc_state->update_pipe = false;
+		}
+	}
+}
+
+static void
+intel_dp_atomic_check_synced_crtcs(struct intel_atomic_state *state)
+{
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_crtc *crtc;
+	int i;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					 new_crtc_state, i) {
+		if (!is_trans_port_sync_mode(new_crtc_state) ||
+		    !needs_modeset(new_crtc_state))
+			continue;
+
+		intel_dp_modeset_synced_crtcs(state);
+	}
+}
+
+static int
+intel_dp_modeset_all_tiles(struct intel_atomic_state *state, int tile_grp_id)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_list_iter;
+
+	drm_connector_list_iter_begin(&dev_priv->drm, &conn_list_iter);
+	drm_for_each_connector_iter(connector, &conn_list_iter) {
+		struct drm_connector_state *conn_iter_state;
+		struct drm_crtc_state *crtc_state;
+
+		if (!(connector->has_tile &&
+		      connector->tile_group->id == tile_grp_id))
+			continue;
+		conn_iter_state = drm_atomic_get_connector_state(&state->base,
+								 connector);
+		if (IS_ERR(conn_iter_state)) {
+			drm_connector_list_iter_end(&conn_list_iter);
+			return PTR_ERR(conn_iter_state);
+		}
+
+		if (!conn_iter_state->crtc)
+			continue;
+
+		crtc_state = drm_atomic_get_crtc_state(&state->base,
+						       conn_iter_state->crtc);
+		if (IS_ERR(crtc_state)) {
+			drm_connector_list_iter_end(&conn_list_iter);
+			return PTR_ERR(conn_iter_state);
+		}
+		crtc_state->mode_changed = true;
+	}
+	drm_connector_list_iter_end(&conn_list_iter);
+
+	return 0;
+}
+
+static int
+intel_dp_atomic_check_tiled_conns(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct drm_connector *connector;
+	struct drm_connector_state *old_conn_state, *new_conn_state;
+	int i, ret;
+
+	if (INTEL_GEN(dev_priv) < 11)
+		return 0;
+
+	/* Is tiled, mark all other tiled CRTCs as needing a modeset */
+	for_each_oldnew_connector_in_state(&state->base, connector,
+					   old_conn_state, new_conn_state, i) {
+		if (!connector->has_tile)
+			continue;
+		if (!intel_connector_needs_modeset(state, old_conn_state,
+						   new_conn_state))
+			continue;
+
+		ret = intel_dp_modeset_all_tiles(state, connector->tile_group->id);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 /**
  * intel_atomic_check - validate state object
  * @dev: drm device
@@ -14059,6 +14146,12 @@ static int intel_atomic_check(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
+	ret = intel_dp_atomic_check_tiled_conns(state);
+	if (ret)
+		goto fail;
+
+	intel_dp_atomic_check_synced_crtcs(state);
+
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
 		if (!needs_modeset(new_crtc_state)) {
@@ -14089,6 +14182,32 @@ static int intel_atomic_check(struct drm_device *dev,
 			any_ms = true;
 	}
 
+	/*
+	 * In case of port synced crtcs, if one of the synced crtcs
+	 * needs a full modeset, all other synced crtcs should be
+	 * forced a full modeset.
+	 */
+	intel_dp_atomic_check_synced_crtcs(state);
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		if (needs_modeset(new_crtc_state))
+			continue;
+
+		/*
+		 * If we're not doing the full modeset we want to
+		 * keep the current M/N values as they may be
+		 * sufficiently different to the computed values
+		 * to cause problems.
+		 *
+		 * FIXME: should really copy more fuzzy state here
+		 */
+		new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
+		new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
+		new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
+		new_crtc_state->has_drrs = old_crtc_state->has_drrs;
+	}
+
 	if (any_ms && !check_digital_port_conflicts(state)) {
 		DRM_DEBUG_KMS("rejecting conflicting digital port configuration\n");
 		ret = EINVAL;
