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mtd: nand: fix chances to create incomplete ECC data when writing

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When mtk_nfc_do_write_page() comparing the sector number,because the
sector number field is at the 12th-bit position of NFI_BYTELEN
register,the masked register should be shifted 12 bits before being
compared.The result of this bug may cause the second subpage has
incomplete ECC parity bytes.

Signed-off-by: RogerCC Lin <rogercc.lin@mediatek.com>
Fixes: 1d6b1e464950 ("mtd: mediatek: driver for MTK Smart Device")
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
RogerCC Lin 2016-09-19 10:53:26 +08:00 committed by Boris Brezillon
parent 7a35328992
commit 559e58e7ed
1 changed files with 5 additions and 2 deletions
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7
drivers/mtd/nand/mtk_nand.c
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@ -93,6 +93,9 @@
#define NFI_FSM_MASK (0xf << 16)
#define NFI_ADDRCNTR (0x70)
#define CNTR_MASK GENMASK(16, 12)
#define ADDRCNTR_SEC_SHIFT (12)
#define ADDRCNTR_SEC(val) \
(((val) & CNTR_MASK) >> ADDRCNTR_SEC_SHIFT)
#define NFI_STRADDR (0x80)
#define NFI_BYTELEN (0x84)
#define NFI_CSEL (0x90)
@ -699,7 +702,7 @@ static int mtk_nfc_do_write_page(struct mtd_info *mtd, struct nand_chip *chip,
}
ret = readl_poll_timeout_atomic(nfc->regs + NFI_ADDRCNTR, reg,
(reg & CNTR_MASK) >= chip->ecc.steps,
ADDRCNTR_SEC(reg) >= chip->ecc.steps,
10, MTK_TIMEOUT);
if (ret)
dev_err(dev, "hwecc write timeout\n");
@ -902,7 +905,7 @@ static int mtk_nfc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
dev_warn(nfc->dev, "read ahb/dma done timeout\n");
rc = readl_poll_timeout_atomic(nfc->regs + NFI_BYTELEN, reg,
(reg & CNTR_MASK) >= sectors, 10,
ADDRCNTR_SEC(reg) >= sectors, 10,
MTK_TIMEOUT);
if (rc < 0) {
dev_err(nfc->dev, "subpage done timeout\n");