BT_SCO_STATE_LOOPBACK
bool lpbk_en = bt->tx->state == BT_SCO_STATE_LOOPBACK;
mtk_btcvsd_snd_set_state(bt, bt->tx, BT_SCO_STATE_LOOPBACK);
mtk_btcvsd_snd_set_state(bt, bt->rx, BT_SCO_STATE_LOOPBACK);
bt->tx->state != BT_SCO_STATE_LOOPBACK) {
if (bt->tx->state == BT_SCO_STATE_LOOPBACK) {