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mtd: nand: fix SCAN2NDPAGE check for BBM

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nand_block_bad() doesn't check the correct pages when
NAND_BBT_SCAN2NDPAGE is enabled. It should scan both the OOB region of
both the 1st and 2nd page of each block.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Brian Norris 2012-01-13 18:11:48 -08:00 committed by David Woodhouse
parent 009184296d
commit cdbec05086
1 changed files with 23 additions and 17 deletions
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40
drivers/mtd/nand/nand_base.c
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@ -338,7 +338,7 @@ static int nand_verify_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
*/
static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
{
int page, chipnr, res = 0;
int page, chipnr, res = 0, i = 0;
struct nand_chip *chip = mtd->priv;
u16 bad;
@ -356,23 +356,29 @@ static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
chip->select_chip(mtd, chipnr);
}
if (chip->options & NAND_BUSWIDTH_16) {
chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE,
page);
bad = cpu_to_le16(chip->read_word(mtd));
if (chip->badblockpos & 0x1)
bad >>= 8;
else
bad &= 0xFF;
} else {
chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos, page);
bad = chip->read_byte(mtd);
}
do {
if (chip->options & NAND_BUSWIDTH_16) {
chip->cmdfunc(mtd, NAND_CMD_READOOB,
chip->badblockpos & 0xFE, page);
bad = cpu_to_le16(chip->read_word(mtd));
if (chip->badblockpos & 0x1)
bad >>= 8;
else
bad &= 0xFF;
} else {
chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos,
page);
bad = chip->read_byte(mtd);
}
if (likely(chip->badblockbits == 8))
res = bad != 0xFF;
else
res = hweight8(bad) < chip->badblockbits;
if (likely(chip->badblockbits == 8))
res = bad != 0xFF;
else
res = hweight8(bad) < chip->badblockbits;
ofs += mtd->writesize;
page = (int)(ofs >> chip->page_shift) & chip->pagemask;
i++;
} while (!res && i < 2 && (chip->bbt_options & NAND_BBT_SCAN2NDPAGE));
if (getchip)
nand_release_device(mtd);