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mtd: atmel_nand: make ecc parameters same as definition

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If the ecc parameter is not the same as definition, when the
mtd core check these parameters, it will give the error result.

Take the following as an example:

Calculate how many bits can be corrected in one page.
According to the ecc parameters definition,

one page correct bits = (mtd->writesize * ecc->strength) / ecc->size

take the following use case as an example:
mtd->writesize = 2048 bytes
ecc->strength = 4 bytes (for 512 bytes)

before this patch, the ecc->size = 2048, so the result is 4 bytes.
after this patch, the ecc->size = 512, so the result is 16 bytes.

So, align the ecc parameters the same as definition to correct
this kind of error.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Bo Shen 2014-06-12 15:58:45 +08:00 committed by Brian Norris
parent 974647ea8a
commit b38576667c
1 changed files with 10 additions and 10 deletions
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20
drivers/mtd/nand/atmel_nand.c
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@ -861,12 +861,11 @@ static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
{
struct nand_chip *nand_chip = mtd->priv;
struct atmel_nand_host *host = nand_chip->priv;
int i, err_nbr, eccbytes;
int i, err_nbr;
uint8_t *buf_pos;
int total_err = 0;
eccbytes = nand_chip->ecc.bytes;
for (i = 0; i < eccbytes; i++)
for (i = 0; i < nand_chip->ecc.total; i++)
if (ecc[i] != 0xff)
goto normal_check;
/* Erased page, return OK */
@ -928,7 +927,7 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
{
struct atmel_nand_host *host = chip->priv;
int eccsize = chip->ecc.size;
int eccsize = chip->ecc.size * chip->ecc.steps;
uint8_t *oob = chip->oob_poi;
uint32_t *eccpos = chip->ecc.layout->eccpos;
uint32_t stat;
@ -1169,8 +1168,7 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
goto err;
}
/* ECC is calculated for the whole page (1 step) */
nand_chip->ecc.size = mtd->writesize;
nand_chip->ecc.size = sector_size;
/* set ECC page size and oob layout */
switch (mtd->writesize) {
@ -1185,18 +1183,20 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
host->pmecc_index_of = host->pmecc_rom_base +
host->pmecc_lookup_table_offset;
nand_chip->ecc.steps = 1;
nand_chip->ecc.steps = host->pmecc_sector_number;
nand_chip->ecc.strength = cap;
nand_chip->ecc.bytes = host->pmecc_bytes_per_sector *
nand_chip->ecc.bytes = host->pmecc_bytes_per_sector;
nand_chip->ecc.total = host->pmecc_bytes_per_sector *
host->pmecc_sector_number;
if (nand_chip->ecc.bytes > mtd->oobsize - 2) {
if (nand_chip->ecc.total > mtd->oobsize - 2) {
dev_err(host->dev, "No room for ECC bytes\n");
err_no = -EINVAL;
goto err;
}
pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
mtd->oobsize,
nand_chip->ecc.bytes);
nand_chip->ecc.total);
nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
break;
case 512: