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| author | Josh Wu <josh.wu@atmel.com> | 2013-08-19 18:05:44 +0800 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2013-08-30 21:41:39 +0100 |
| commit | 2fa831f9db1f1a13960f4ea0fd0454402717b453 (patch) | |
| tree | 97c4bbba2a72689cf85ff627f62c1f6b87640e4f | |
| parent | eedeac3ce94e2a3d4ff28974221b9f309358d8de (diff) | |
| download | linux-2fa831f9db1f1a13960f4ea0fd0454402717b453.tar.gz linux-2fa831f9db1f1a13960f4ea0fd0454402717b453.tar.bz2 linux-2fa831f9db1f1a13960f4ea0fd0454402717b453.zip | |
mtd: atmel_nand: pmecc: fix failure to correct bit error in 1024-bytes sector
The PMECC use BCH algorithm to correct error. In BCH algorithm, the primitive
polynomial value is GF(2^13) for 512-bytes sector size. And it is GF(2^14) for
1024-bytes sector size.
This patch will choose correct degree of the remainders (13 or 14) for
different sector size.
Tested in AT91SAM9X5-EK with MLC nand flash.
More detail can be found in ยง5.4.1 of:
AT91SAM ARM-based Embedded MPU Application Note
<http://www.atmel.com/Images/doc11127.pdf>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 0e365daad9cc..8b2eb3e5896b 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -1204,7 +1204,8 @@ static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev, /* set ECC page size and oob layout */ switch (mtd->writesize) { case 2048: - host->pmecc_degree = PMECC_GF_DIMENSION_13; + host->pmecc_degree = (sector_size == 512) ? + PMECC_GF_DIMENSION_13 : PMECC_GF_DIMENSION_14; host->pmecc_cw_len = (1 << host->pmecc_degree) - 1; host->pmecc_sector_number = mtd->writesize / sector_size; host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes( |