linux-kernel - [PATCH] mtd: nand: Fix regression in BBM detection

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Date:	Wed, 18 Aug 2010 11:25:04 -0700
From:	"Brian Norris" <norris@...adcom.com>
To:	linux-mtd@...ts.infradead.org
cc:	"David Woodhouse" <dwmw2@...radead.org>,
	"Artem Bityutskiy" <dedekind1@...il.com>,
	"Brian Norris" <norris@...adcom.com>, mike@...loops.com,
	"Linux Kernel" <linux-kernel@...r.kernel.org>, awg@...toolkit.org
Subject: [PATCH] mtd: nand: Fix regression in BBM detection

Commit c7b28e25cb9beb943aead770ff14551b55fa8c79 caused a regression
in detection of factory-set bad block markers, especially for certain
small-page NAND. This fix removes some unneeded constraints on using
NAND_SMALL_BADBLOCK_POS, making the detection code more correct.

This regression can be seen, for example, in Hynix HY27US081G1M and
similar.

Signed-off-by: Brian Norris <norris@...adcom.com>
---
 drivers/mtd/nand/nand_base.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index a3c7473..a22ed7b 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2934,14 +2934,10 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 		chip->chip_shift = ffs((unsigned)(chip->chipsize >> 32)) + 32 - 1;
 
 	/* Set the bad block position */
-	if (!(busw & NAND_BUSWIDTH_16) && (*maf_id == NAND_MFR_STMICRO ||
-				(*maf_id == NAND_MFR_SAMSUNG &&
-				 mtd->writesize == 512) ||
-				*maf_id == NAND_MFR_AMD))
-		chip->badblockpos = NAND_SMALL_BADBLOCK_POS;
-	else
+	if (mtd->writesize > 512 || (busw & NAND_BUSWIDTH_16))
 		chip->badblockpos = NAND_LARGE_BADBLOCK_POS;
-
+	else
+		chip->badblockpos = NAND_SMALL_BADBLOCK_POS;
 
 	/* Get chip options, preserve non chip based options */
 	chip->options &= ~NAND_CHIPOPTIONS_MSK;
-- 
1.7.0.4


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