[PATCH 6.1 080/127] mtd: rawnand: meson: fix OOB available bytes for ECC

Greg Kroah-Hartman
2023-08-09T10:54:54Z

From: Arseniy Krasnov <AVKrasnov@sberdevices.ru>

commit 7e6b04f9238eab0f684fafd158c1f32ea65b9eaa upstream.

It is incorrect to calculate number of OOB bytes for ECC engine using
some "already known" ECC step size (1024 bytes here). Number of such
bytes for ECC engine must be whole OOB except 2 bytes for bad block
marker, while proper ECC step size and strength will be selected by
ECC logic.

Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller")
Cc: <Stable@vger.kernel.org>
Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230705065211.293500-1-AVKrasnov@sberdevices.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mtd/nand/raw/meson_nand.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -1184,7 +1184,6 @@ static int meson_nand_attach_chip(struct
struct meson_nfc *nfc = nand_get_controller_data(nand);
struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
struct mtd_info *mtd = nand_to_mtd(nand);
- int nsectors = mtd->writesize / 1024;
int ret;

if (!mtd->name) {
@@ -1202,7 +1201,7 @@ static int meson_nand_attach_chip(struct
nand->options |= NAND_NO_SUBPAGE_WRITE;

ret = nand_ecc_choose_conf(nand, nfc->data->ecc_caps,
- mtd->oobsize - 2 * nsectors);
+ mtd->oobsize - 2);
if (ret) {
dev_err(nfc->dev, "failed to ECC init\n");
return -EINVAL;