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ramips: correct page read return value of the mt7621 nand driver

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read_page() need to return maximum number of bitflips instead of the
accumulated number. Change takes from upstream mt7621 u-boot [1].

 * @read_page:  function to read a page according to the ECC generator
 *              requirements; returns maximum number of bitflips
 *              corrected in any single ECC step, -EIO hw error

[1] https://lore.kernel.org/all/cover.1653015383.git.weijie.gao@mediatek.com/

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
(cherry picked from commit 2fbb91d73f)
This commit is contained in:
Shiji Yang
2023-05-21 22:51:16 +08:00
committed by Christian Lamparter
parent 80a99d9cf7
commit 80fbad19ef
1 changed files with 9 additions and 5 deletions
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14
target/linux/ramips/files/drivers/mtd/nand/raw/mt7621_nand.c
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@@ -1006,7 +1006,7 @@ static int mt7621_nfc_read_page_hwecc(struct nand_chip *nand, uint8_t *buf,
{
struct mt7621_nfc *nfc = nand_get_controller_data(nand);
struct mtd_info *mtd = nand_to_mtd(nand);
int bitflips = 0;
int bitflips = 0, ret = 0;
int rc, i;
nand_read_page_op(nand, page, 0, NULL, 0);
@@ -1031,7 +1031,7 @@ static int mt7621_nfc_read_page_hwecc(struct nand_chip *nand, uint8_t *buf,
mt7621_nfc_read_sector_fdm(nfc, i);
if (rc < 0) {
bitflips = -EIO;
ret = -EIO;
continue;
}
@@ -1043,10 +1043,11 @@ static int mt7621_nfc_read_page_hwecc(struct nand_chip *nand, uint8_t *buf,
dev_dbg(nfc->dev,
"Uncorrectable ECC error at page %d.%d\n",
page, i);
bitflips = -EBADMSG;
bitflips = nand->ecc.strength + 1;
mtd->ecc_stats.failed++;
} else if (bitflips >= 0) {
bitflips += rc;
} else {
if (rc > bitflips)
bitflips = rc;
mtd->ecc_stats.corrected += rc;
}
}
@@ -1055,6 +1056,9 @@ static int mt7621_nfc_read_page_hwecc(struct nand_chip *nand, uint8_t *buf,
nfi_write16(nfc, NFI_CON, 0);
if (ret < 0)
return ret;
return bitflips;
}