BTMTKUART_REQUIRED_WAKEUP
if (test_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state)) {
clear_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);
set_bit(BTMTKUART_REQUIRED_WAKEUP, &bdev->tx_state);