[PATCH 2/3] mtd: rawnand: micron: Disable ECC earlier in the read path

[Boris Brezillon <boris.brezillon@bootlin.com>]

We are about to support extracting the real number of bitflips for
4-bits ECC when WRITE_RECOMMEND is returned. This requires re-reading
the page in raw mode to compare it to the corrected version, and this
logic will be placed in micron_nand_on_die_ecc_status_4().

Moving the micron_nand_on_die_ecc_setup() will allow us to disable
ECC only once.

As a result, we have to rework the exit path and add an error path
where the ECC is disabled.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
 drivers/mtd/nand/raw/nand_micron.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c
index 63ac98a36ed7..b9cbaf125a98 100644
--- a/drivers/mtd/nand/raw/nand_micron.c
+++ b/drivers/mtd/nand/raw/nand_micron.c
@@ -197,30 +197,37 @@ micron_nand_read_page_on_die_ecc(struct mtd_info *mtd, struct nand_chip *chip,
 
 	ret = nand_read_page_op(chip, page, 0, NULL, 0);
 	if (ret)
-		goto out;
+		goto err_disable_ecc;
 
 	ret = nand_status_op(chip, &status);
 	if (ret)
-		goto out;
+		goto err_disable_ecc;
 
 	ret = nand_exit_status_op(chip);
 	if (ret)
-		goto out;
+		goto err_disable_ecc;
 
-	if (chip->ecc.strength == 4)
-		max_bitflips = micron_nand_on_die_ecc_status_4(chip, status);
-	else
-		max_bitflips = micron_nand_on_die_ecc_status_8(chip, status);
+	micron_nand_on_die_ecc_setup(chip, false);
 
 	ret = nand_read_data_op(chip, buf, mtd->writesize, false);
 	if (!ret && oob_required)
 		ret = nand_read_data_op(chip, chip->oob_poi, mtd->oobsize,
 					false);
 
-out:
+	if (ret)
+		return ret;
+
+	if (chip->ecc.strength == 4)
+		max_bitflips = micron_nand_on_die_ecc_status_4(chip, status);
+	else
+		max_bitflips = micron_nand_on_die_ecc_status_8(chip, status);
+
+	return max_bitflips;
+
+err_disable_ecc:
 	micron_nand_on_die_ecc_setup(chip, false);
 
-	return ret ? ret : max_bitflips;
+	return ret;
 }
 
 static int
-- 
2.14.1