queue-6.6/mtd-nand-relax-ecc-parameter-validation-check.patch

From a5c02ab00e1144c82deaf90ca24aec96abac6af2 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 24 Oct 2025 13:19:42 +1300
Subject: mtd: nand: relax ECC parameter validation check

From: Aryan Srivastava <aryan.srivastava@alliedtelesis.co.nz>

[ Upstream commit 050553c683f21eebd7d1020df9b2ec852e2a9e4e ]

Due to the custom handling and layouts of certain nand controllers this
validity check will always fail for certain layouts. The check
inherently depends on even chunk sizing and this is not always the
case.

Modify the check to only print a warning, instead of failing to
init the attached NAND. This allows various 8 bit and 12 ECC strength
layouts to be used.

Fixes: 68c18dae6888 ("mtd: rawnand: marvell: add missing layouts")
Signed-off-by: Aryan Srivastava <aryan.srivastava@alliedtelesis.co.nz>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mtd/nand/raw/nand_base.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 7c3e3d70be8b0..fe0b298f8425e 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -6450,11 +6450,14 @@ static int nand_scan_tail(struct nand_chip *chip)
 		ecc->steps = mtd->writesize / ecc->size;
 	if (!base->ecc.ctx.nsteps)
 		base->ecc.ctx.nsteps = ecc->steps;
-	if (ecc->steps * ecc->size != mtd->writesize) {
-		WARN(1, "Invalid ECC parameters\n");
-		ret = -EINVAL;
-		goto err_nand_manuf_cleanup;
-	}
+
+	/*
+	 * Validity check: Warn if ECC parameters are not compatible with page size.
+	 * Due to the custom handling of ECC blocks in certain controllers the check
+	 * may result in an expected failure.
+	 */
+	if (ecc->steps * ecc->size != mtd->writesize)
+		pr_warn("ECC parameters may be invalid in reference to underlying NAND chip\n");
 
 	if (!ecc->total) {
 		ecc->total = ecc->steps * ecc->bytes;
-- 
2.51.0