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mtd: nand: sunxi: Support ECC maximization

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Setup the maximum ECC config when NAND_ECC_MAXIMIZE is set.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Boris Brezillon 2016-06-08 17:04:24 +02:00
parent 8bbba48124
commit 4796d86559
1 changed files with 29 additions and 0 deletions
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29
drivers/mtd/nand/sunxi_nand.c
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@ -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;