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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 §5.4.1 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>
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@ -1204,7 +1204,8 @@ static int __init atmel_pmecc_nand_init_params(struct platform_device *pdev,
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/* set ECC page size and oob layout */
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switch (mtd->writesize) {
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case 2048:
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host->pmecc_degree = PMECC_GF_DIMENSION_13;
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host->pmecc_degree = (sector_size == 512) ?
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PMECC_GF_DIMENSION_13 : PMECC_GF_DIMENSION_14;
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host->pmecc_cw_len = (1 << host->pmecc_degree) - 1;
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host->pmecc_sector_number = mtd->writesize / sector_size;
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host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes(
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