ECC_NUM_DATA_BYTES_MASK
FIELD_PREP(ECC_NUM_DATA_BYTES_MASK, host->cw_data) |
host->ecc_bch_cfg &= ~ECC_NUM_DATA_BYTES_MASK;
host->ecc_bch_cfg |= FIELD_PREP(ECC_NUM_DATA_BYTES_MASK, host->cw_data);
FIELD_PREP(ECC_NUM_DATA_BYTES_MASK, ecc_cfg->cw_data) |