linux-kernel - [PATCH 3/4] mtd: nand: mxc

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Message-Id: <20240417-mtd-nand-mxc-nand-exec-op-v1-3-d12564fe54e9@pengutronix.de>
Date: Wed, 17 Apr 2024 09:13:30 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 3/4] mtd: nand: mxc_nand: support software ECC

To support software ECC we still need the driver provided read_oob,
read_page_raw and write_page_raw ops, so set them unconditionally
no matter which engine_type we use. The OOB layout on the other hand
represents the layout the i.MX ECC hardware uses, so set this only
when NAND_ECC_ENGINE_TYPE_ON_HOST is in use.

With these changes the driver can be used with software BCH ECC which
is useful for NAND chips that require a stronger ECC than the i.MX
hardware supports.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/mtd/nand/raw/mxc_nand.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/mxc_nand.c b/drivers/mtd/nand/raw/mxc_nand.c
index fc70c65dea268..f44c130dca18d 100644
--- a/drivers/mtd/nand/raw/mxc_nand.c
+++ b/drivers/mtd/nand/raw/mxc_nand.c
@@ -1394,15 +1394,16 @@ static int mxcnd_attach_chip(struct nand_chip *chip)
 	chip->ecc.bytes = host->devtype_data->eccbytes;
 	host->eccsize = host->devtype_data->eccsize;
 	chip->ecc.size = 512;
-	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
+
+	chip->ecc.read_oob = mxc_nand_read_oob;
+	chip->ecc.read_page_raw = mxc_nand_read_page_raw;
+	chip->ecc.write_page_raw = mxc_nand_write_page_raw;
 
 	switch (chip->ecc.engine_type) {
 	case NAND_ECC_ENGINE_TYPE_ON_HOST:
+		mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
 		chip->ecc.read_page = mxc_nand_read_page;
-		chip->ecc.read_page_raw = mxc_nand_read_page_raw;
-		chip->ecc.read_oob = mxc_nand_read_oob;
 		chip->ecc.write_page = mxc_nand_write_page_ecc;
-		chip->ecc.write_page_raw = mxc_nand_write_page_raw;
 		chip->ecc.write_oob = mxc_nand_write_oob;
 		break;
 

-- 
2.39.2