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From:   Christophe Kerello <christophe.kerello@st.com>
To:     <miquel.raynal@bootlin.com>, <richard@nod.at>, <vigneshr@ti.com>
CC:     <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Christophe Kerello <christophe.kerello@st.com>
Subject: [PATCH] mtd: rawnand: stm32_fmc2: fix broken ECC
Date:   Thu, 29 Oct 2020 17:38:12 +0100
Message-ID: <1603989492-6670-1-git-send-email-christophe.kerello@st.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Since commit d7157ff49a5b ("mtd: rawnand: Use the ECC framework user
input parsing bits"), ECC are broken in FMC2 driver in case of
nand-ecc-step-size and nand-ecc-strength are not set in the device tree.
The default user configuration set in FMC2 driver is lost when
rawnand_dt_init function is called. To avoid to lose the default user
configuration, it is needed to move it in the new user_conf structure.

Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Fixes: d7157ff49a5b ("mtd: rawnand: Use the ECC framework user input parsing bits")
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index b31a581..dc86ac9 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1846,6 +1846,7 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct mtd_info *mtd;
 	struct nand_chip *chip;
+	struct nand_device *nanddev;
 	struct resource cres;
 	int chip_cs, mem_region, ret, irq;
 	int start_region = 0;
@@ -1952,10 +1953,11 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
 	chip->options |= NAND_BUSWIDTH_AUTO | NAND_NO_SUBPAGE_WRITE |
 			 NAND_USES_DMA;
 
-	/* Default ECC settings */
+	/* Default ECC user settings */
 	chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
-	chip->ecc.size = FMC2_ECC_STEP_SIZE;
-	chip->ecc.strength = FMC2_ECC_BCH8;
+	nanddev = mtd_to_nanddev(mtd);
+	nanddev->ecc.user_conf.step_size = FMC2_ECC_STEP_SIZE;
+	nanddev->ecc.user_conf.strength = FMC2_ECC_BCH8;
 
 	/* Scan to find existence of the device */
 	ret = nand_scan(chip, nand->ncs);
-- 
1.9.1