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Commit 438320dd authored by Jordan Friendshuh's avatar Jordan Friendshuh Committed by Brian Norris
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mtd: nand: Base BCH ECC bytes on required strength 



NAND devices with page sizes over 4 KiB require more than 4-bits of ECC
coverage. This patch calculates the value of ecc_bytes based on a still
assumed 512-byte step size (13-bits) and the ecc_strength.

Example:
Micron M73A devices (8 KiB page) require 8-bit ECC per 512-byte

Signed-off-by: default avatarJordan Friendshuh <jfriendshuh@xes-inc.com>
Signed-off-by: default avatarAaron Sierra <asierra@xes-inc.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent c9d79c4b

drivers/mtd/nand/nand_base.c

+1 −1
Original line number Diff line number Diff line
@@ -4035,7 +4035,7 @@ int nand_scan_tail(struct mtd_info *mtd) 
		 */

		if (!ecc->size && (mtd->oobsize >= 64)) {

			ecc->size = 512;

			ecc->bytes = 7;

			ecc->bytes = DIV_ROUND_UP(13 * ecc->strength, 8);

		}

		ecc->priv = nand_bch_init(mtd, ecc->size, ecc->bytes,

					       &ecc->layout);