WL_TX_POWER_MCS40_CDD_FIRST
rate_start_index = WL_TX_POWER_MCS40_CDD_FIRST;
pi->txpwr_limit[WL_TX_POWER_MCS40_CDD_FIRST] =
min(pi->txpwr_limit[WL_TX_POWER_MCS40_CDD_FIRST],
pi->txpwr_limit[WL_TX_POWER_MCS40_CDD_FIRST];
WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;