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| author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-06-08 17:04:24 +0200 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-09-23 09:35:16 +0200 |
| commit | 4796d8655915b8dce265318542a40d920aad91a3 (patch) | |
| tree | b63f91f3ce4e11c344bf2e0733938b7bc779ecce | |
| parent | mtd: nand: Support maximizing ECC when using software BCH (diff) | |
| download | linux-4796d8655915b8dce265318542a40d920aad91a3.tar.xz linux-4796d8655915b8dce265318542a40d920aad91a3.zip | |
mtd: nand: sunxi: Support ECC maximization
Setup the maximum ECC config when NAND_ECC_MAXIMIZE is set.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
| -rw-r--r-- | drivers/mtd/nand/sunxi_nand.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index 2032244138c1..8b8470c4e6d0 100644 --- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -1787,6 +1787,35 @@ static int sunxi_nand_hw_common_ecc_ctrl_init(struct mtd_info *mtd, int ret; int i; + if (ecc->options & NAND_ECC_MAXIMIZE) { + int bytes; + + ecc->size = 1024; + nsectors = mtd->writesize / ecc->size; + + /* Reserve 2 bytes for the BBM */ + bytes = (mtd->oobsize - 2) / nsectors; + + /* 4 non-ECC bytes are added before each ECC bytes section */ + bytes -= 4; + + /* and bytes has to be even. */ + if (bytes % 2) + bytes--; + + ecc->strength = bytes * 8 / fls(8 * ecc->size); + + for (i = 0; i < ARRAY_SIZE(strengths); i++) { + if (strengths[i] > ecc->strength) + break; + } + + if (!i) + ecc->strength = 0; + else + ecc->strength = strengths[i - 1]; + } + if (ecc->size != 512 && ecc->size != 1024) return -EINVAL; |