CEC_DATA_BIT_US
wait_arb_lost_us = 4 * CEC_DATA_BIT_US + CEC_START_BIT_US;
wait_xfer_us = first_msg.len * 10 * CEC_DATA_BIT_US;
wait_xfer_us = 10 * CEC_DATA_BIT_US;
retry_us = CEC_SIGNAL_FREE_TIME_RETRY * CEC_DATA_BIT_US - delta_us;
usleep_range(2 * CEC_DATA_BIT_US - CEC_MARGIN_US,
2 * CEC_DATA_BIT_US);