diff options
| author | Boris Brezillon | 2016-06-08 17:04:23 +0200 |
|---|---|---|
| committer | Boris Brezillon | 2016-09-23 09:35:16 +0200 |
| commit | 8bbba48124f2ace8f8bf382539d7115f0f307eeb (patch) | |
| tree | ae1b7cff469a712a908d550cfec391e169d70296 /drivers/mtd | |
| parent | mtd: nand: Add an option to maximize the ECC strength (diff) | |
| download | kernel-qcow2-linux-8bbba48124f2ace8f8bf382539d7115f0f307eeb.tar.gz kernel-qcow2-linux-8bbba48124f2ace8f8bf382539d7115f0f307eeb.tar.xz kernel-qcow2-linux-8bbba48124f2ace8f8bf382539d7115f0f307eeb.zip | |
mtd: nand: Support maximizing ECC when using software BCH
Add support for ECC maximization when software BCH with
nand_ooblayout_lp_ops layout is used.
Other cases should be handled by the NAND controller driver.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 6669dfcf9e79..a74d9e4bd8b2 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -4396,6 +4396,7 @@ static int nand_set_ecc_soft_ops(struct mtd_info *mtd) ecc->write_page_raw = nand_write_page_raw; ecc->read_oob = nand_read_oob_std; ecc->write_oob = nand_write_oob_std; + /* * Board driver should supply ecc.size and ecc.strength * values to select how many bits are correctable. @@ -4418,6 +4419,25 @@ static int nand_set_ecc_soft_ops(struct mtd_info *mtd) } mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops); + + } + + /* + * We can only maximize ECC config when the default layout is + * used, otherwise we don't know how many bytes can really be + * used. + */ + if (mtd->ooblayout == &nand_ooblayout_lp_ops && + ecc->options & NAND_ECC_MAXIMIZE) { + int steps, bytes; + + /* Always prefer 1k blocks over 512bytes ones */ + ecc->size = 1024; + steps = mtd->writesize / ecc->size; + + /* Reserve 2 bytes for the BBM */ + bytes = (mtd->oobsize - 2) / steps; + ecc->strength = bytes * 8 / fls(8 * ecc->size); } /* See nand_bch_init() for details. */ |