[PATCH v5 5/5] mtd: nand: jz4740: remove custom 'erased check' implementation

[Boris Brezillon]

The jz4740 drivers is manually checking for 'erased pages' while
correcting ECC bytes.
This logic can now done by the core infrastructure, and can thus be removed
from this drivers.

Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
Changes since v4:
- add missing NAND_ECC_GENERIC_ERASED_CHECK flag

 drivers/mtd/nand/jz4740_nand.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/mtd/nand/jz4740_nand.c b/drivers/mtd/nand/jz4740_nand.c
index adccae3..b19d2a9 100644
--- a/drivers/mtd/nand/jz4740_nand.c
+++ b/drivers/mtd/nand/jz4740_nand.c
@@ -224,24 +224,6 @@ static int jz_nand_correct_ecc_rs(struct mtd_info *mtd, uint8_t *dat,
 	uint32_t t;
 	unsigned int timeout = 1000;
 
-	t = read_ecc[0];
-
-	if (t == 0xff) {
-		for (i = 1; i < 9; ++i)
-			t &= read_ecc[i];
-
-		t &= dat[0];
-		t &= dat[nand->chip.ecc.size / 2];
-		t &= dat[nand->chip.ecc.size - 1];
-
-		if (t == 0xff) {
-			for (i = 1; i < nand->chip.ecc.size - 1; ++i)
-				t &= dat[i];
-			if (t == 0xff)
-				return 0;
-		}
-	}
-
 	for (i = 0; i < 9; ++i)
 		writeb(read_ecc[i], nand->base + JZ_REG_NAND_PAR0 + i);
 
@@ -443,6 +425,7 @@ static int jz_nand_probe(struct platform_device *pdev)
 	chip->ecc.size		= 512;
 	chip->ecc.bytes		= 9;
 	chip->ecc.strength	= 4;
+	chip->ecc.options	= NAND_ECC_GENERIC_ERASED_CHECK;
 
 	if (pdata)
 		chip->ecc.layout = pdata->ecc_layout;
-- 
2.1.4