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| author | Josh Wu <josh.wu@atmel.com> | 2012-11-27 18:50:31 +0800 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2012-12-03 16:36:53 +0200 |
| commit | c0c70d9ee6569150ff6a10f9d3c50c63c917e3a1 (patch) | |
| tree | 6af5ba5479e3ce83da9438679e3a096b6d4c9195 /drivers/mtd | |
| parent | 070c32223ae8a724a190ea769104ea41567e3673 (diff) | |
| download | linux-c0c70d9ee6569150ff6a10f9d3c50c63c917e3a1.tar.bz2 | |
mtd: at91: atmel_nand: return bit flips for the PMECC read_page()
This patch fix pmecc's read_page() to return maximum number of bitflips, 0 if uncorrectable.
In the commit: 3f91e94f7f511de74c0d2abe08672ccdbdd1961c ("mtd: nand: read_page() returns max_bitflips ()"),
The ecc.read_page() is changed to return the maximum number of bitflips.
And when meet uncorrectable bitflips it needs to return 0.
See the comment in nand.h:
* @read_page: function to read a page according to the ECC generator
* requirements; returns maximum number of bitflips corrected in
* any single ECC step, 0 if bitflips uncorrectable, -EIO hw error
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Reviewed-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index c9183866a163..1669d2726222 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -723,6 +723,7 @@ static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf, struct atmel_nand_host *host = nand_chip->priv; int i, err_nbr, eccbytes; uint8_t *buf_pos; + int total_err = 0; eccbytes = nand_chip->ecc.bytes; for (i = 0; i < eccbytes; i++) @@ -750,12 +751,13 @@ normal_check: pmecc_correct_data(mtd, buf_pos, ecc, i, host->pmecc_bytes_per_sector, err_nbr); mtd->ecc_stats.corrected += err_nbr; + total_err += err_nbr; } } pmecc_stat >>= 1; } - return 0; + return total_err; } static int atmel_nand_pmecc_read_page(struct mtd_info *mtd, @@ -767,6 +769,7 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd, uint32_t *eccpos = chip->ecc.layout->eccpos; uint32_t stat; unsigned long end_time; + int bitflips = 0; pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST); pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE); @@ -789,11 +792,14 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd, } stat = pmecc_readl_relaxed(host->ecc, ISR); - if (stat != 0) - if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0) - return -EIO; + if (stat != 0) { + bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]); + if (bitflips < 0) + /* uncorrectable errors */ + return 0; + } - return 0; + return bitflips; } static int atmel_nand_pmecc_write_page(struct mtd_info *mtd, |