BTMTKUART_TX_STATE_WAKEUP
clear_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);
if (!test_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state))
set_bit(BTMTKUART_TX_STATE_WAKEUP, &bdev->tx_state);