diff options
| -rw-r--r-- | drivers/mtd/nand/raw/nand_base.c | 33 | ||||
| -rw-r--r-- | include/linux/mtd/rawnand.h | 3 |
2 files changed, 36 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index dbf6e80e9ab5..2858d0b09c1d 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -6295,6 +6295,39 @@ int nand_maximize_ecc(struct nand_chip *chip, } EXPORT_SYMBOL_GPL(nand_maximize_ecc); +/** + * nand_ecc_choose_conf - Set the ECC strength and ECC step size + * @chip: nand chip info structure + * @caps: ECC engine caps info structure + * @oobavail: OOB size that the ECC engine can use + * + * Choose the ECC configuration according to following logic + * + * 1. If both ECC step size and ECC strength are already set (usually by DT) + * then check if it is supported by this controller. + * 2. If NAND_ECC_MAXIMIZE is set, then select maximum ECC strength. + * 3. Otherwise, try to match the ECC step size and ECC strength closest + * to the chip's requirement. If available OOB size can't fit the chip + * requirement then fallback to the maximum ECC step size and ECC strength. + * + * On success, the chosen ECC settings are set. + */ +int nand_ecc_choose_conf(struct nand_chip *chip, + const struct nand_ecc_caps *caps, int oobavail) +{ + if (chip->ecc.size && chip->ecc.strength) + return nand_check_ecc_caps(chip, caps, oobavail); + + if (chip->ecc.options & NAND_ECC_MAXIMIZE) + return nand_maximize_ecc(chip, caps, oobavail); + + if (!nand_match_ecc_req(chip, caps, oobavail)) + return 0; + + return nand_maximize_ecc(chip, caps, oobavail); +} +EXPORT_SYMBOL_GPL(nand_ecc_choose_conf); + /* * Check if the chip configuration meet the datasheet requirements. diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h index fbac4741da52..2ce305388471 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -1672,6 +1672,9 @@ int nand_match_ecc_req(struct nand_chip *chip, int nand_maximize_ecc(struct nand_chip *chip, const struct nand_ecc_caps *caps, int oobavail); +int nand_ecc_choose_conf(struct nand_chip *chip, + const struct nand_ecc_caps *caps, int oobavail); + /* Default write_oob implementation */ int nand_write_oob_std(struct mtd_info *mtd, struct nand_chip *chip, int page); |