[PATCH v2 2/2] mtd: nand: fix chances to create incomplete ECC data when writing.

[RogerCC.Lin]

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 at mediatek.com>
---
 drivers/mtd/nand/mtk_nand.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/mtk_nand.c b/drivers/mtd/nand/mtk_nand.c
index ddaa2ac..5e0727c 100644
--- a/drivers/mtd/nand/mtk_nand.c
+++ b/drivers/mtd/nand/mtk_nand.c
@@ -699,8 +699,8 @@ 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,
-					10, MTK_TIMEOUT);
+			  ((reg & CNTR_MASK) >> 12) >= chip->ecc.steps,
+			  10, MTK_TIMEOUT);
 	if (ret)
 		dev_err(dev, "hwecc write timeout\n");
 
@@ -902,8 +902,8 @@ 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,
-				       MTK_TIMEOUT);
+				       ((reg & CNTR_MASK) >> 12) >= sectors, 
+				       10, MTK_TIMEOUT);
 	if (rc < 0) {
 		dev_err(nfc->dev, "subpage done timeout\n");
 		bitflips = -EIO;
--
1.7.0.4