linux-kernel - [PATCH v3] mtd: spinand: Fix ECC status and OOB layout for Toshiba TC58CVG2S0H

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Date:   Mon, 3 Dec 2018 08:01:38 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "peron.clem@...il.com" <peron.clem@...il.com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: [PATCH v3] mtd: spinand: Fix ECC status and OOB layout for Toshiba
 TC58CVG2S0H

From: Frieder Schrempf <frieder.schrempf@...tron.de>

When reading the status of the on-chip ECC, the Toshiba chip returns
two different states for reporting corrected bitflips. We should check
for both of them.

Also return the free OOB bytes as one contiguous area, instead of
multiple sections.

Suggested-by: Clément Péron <peron.clem@...il.com>
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Acked-by: Clément Péron <peron.clem@...il.com>
---
Changes for v3:
===============
* Add Acked-by
* Add comment for BBM in OOB layout

Changes for v2:
===============
* Remove the changes to the ECC bytes in the OOB layout
---
 drivers/mtd/nand/spi/toshiba.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/spi/toshiba.c b/drivers/mtd/nand/spi/toshiba.c
index 294bcf6..0812655 100644
--- a/drivers/mtd/nand/spi/toshiba.c
+++ b/drivers/mtd/nand/spi/toshiba.c
@@ -11,6 +11,7 @@
 #include <linux/mtd/spinand.h>
 
 #define SPINAND_MFR_TOSHIBA		0x98
+#define TOSH_STATUS_ECC_HAS_BITFLIPS_T	(3 << 4)
 
 static SPINAND_OP_VARIANTS(read_cache_variants,
 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
@@ -33,19 +34,18 @@ static int tc58cvg2s0h_ooblayout_ecc(struct mtd_info *mtd, int section,
 	region->offset = 128 + 16 * section;
 	region->length = 16;
 
-
 	return 0;
 }
 
 static int tc58cvg2s0h_ooblayout_free(struct mtd_info *mtd, int section,
 				      struct mtd_oob_region *region)
 {
-	if (section > 7)
+	if (section > 0)
 		return -ERANGE;
 
-	region->offset = 2 + 16 * section;
-	region->length = 14;
-
+	/* 2 bytes reserved for BBM */
+	region->offset = 2;
+	region->length = 126;
 
 	return 0;
 }
@@ -70,6 +70,7 @@ static int tc58cvg2s0h_ecc_get_status(struct spinand_device *spinand,
 		return -EBADMSG;
 
 	case STATUS_ECC_HAS_BITFLIPS:
+	case TOSH_STATUS_ECC_HAS_BITFLIPS_T:
 		/*
 		 * Let's try to retrieve the real maximum number of bitflips
 		 * in order to avoid forcing the wear-leveling layer to move
-- 
2.7.4