mtd: atmel_nand: make ecc parameters same as definition

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>

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 4ce181a35bcd3eedf39c8fd3a5c617306278ef58..4f5348fd409c8b7107238a325385852dd57898f7 100644 (file)
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -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: