DL_GAIN_8DB
return (reg_idx >= DL_GAIN_8DB && reg_idx <= DL_GAIN_N_12DB) || reg_idx == DL_GAIN_N_40DB;
return (reg_idx >= DL_GAIN_8DB && reg_idx <= DL_GAIN_N_10DB) ||
return (reg_idx >= DL_GAIN_8DB && reg_idx <= DL_GAIN_N_22DB) ||