[PATCH 11/19] mtd: spinand: set bitflip_threshold to 75% of ECC strength

[Mikhail Kshevetskiy]

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.

This is a port of linux commit 1824520e7477bedf76bd08c32261c755e6405cd9
(mtd: spinand: set bitflip_threshold to 75% of ECC strength)

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 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 b4795927277..7ace61fd19f 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1279,6 +1279,7 @@ 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) {
-- 
2.47.2