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>

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 0e365daad9ccd42f44b359e10941a0d3d46df9cb..8b2eb3e5896b1b61ad152bb5916896bcf824ada8 100644 (file)
--- 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(