[PATCH] mtd: spinand: set bitflip_threshold to 75% of ECC strength

From: Daniel Golle
Date: Sun Aug 11 2024 - 22:20:09 EST


Reporting an unclean read from SPI-NAND only when the maximum number
of correctable bitflip errors has been hit seems a bit late.
UBI LEB scrubbing, which depends on the lower MTD device reporting
correctable bitflips, then only kicks in when it's almost too late.

Set bitflip_threshold to 75% of the ECC strength, which is also the
default for raw NAND.

Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
---
drivers/mtd/nand/spi/core.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index e0b6715e5dfed..018c854d06193 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1287,6 +1287,7 @@ static int spinand_init(struct spinand_device *spinand)
/* Propagate ECC information to mtd_info */
mtd->ecc_strength = nanddev_get_ecc_conf(nand)->strength;
mtd->ecc_step_size = nanddev_get_ecc_conf(nand)->step_size;
+ mtd->bitflip_threshold = DIV_ROUND_UP(mtd->ecc_strength * 3, 4);

ret = spinand_create_dirmaps(spinand);
if (ret) {
--
2.46.0