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mtd: nand: use read_oob() instead of cmdfunc() for bad block check

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The nand_default_block_markbad() and scan_block_fast() use high
level APIs to get access to the BBM.

On the other hand, nand_block_bad (the default implementation of
->block_bad) calls the lower level ->cmdfunc hook.  This prevents
drivers from using ->ecc.read_oob() even if optimized read operation
is implemented.  Besides, some NAND controllers may protect the BBM
with ECC.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Masahiro Yamada 2017-03-23 05:07:01 +09:00 committed by Boris Brezillon
parent 9fe4b66efb
commit c120e75e0e
1 changed files with 13 additions and 21 deletions
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34
drivers/mtd/nand/nand_base.c
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@ -354,42 +354,34 @@ static void nand_read_buf16(struct mtd_info *mtd, uint8_t *buf, int len)
*/
static int nand_block_bad(struct mtd_info *mtd, loff_t ofs)
{
int page, res = 0, i = 0;
int page, page_end, res;
struct nand_chip *chip = mtd_to_nand(mtd);
u16 bad;
u8 bad;
if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
ofs += mtd->erasesize - mtd->writesize;
page = (int)(ofs >> chip->page_shift) & chip->pagemask;
page_end = page + (chip->bbt_options & NAND_BBT_SCAN2NDPAGE ? 2 : 1);
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);
}
for (; page < page_end; page++) {
res = chip->ecc.read_oob(mtd, chip, page);
if (res)
return res;
bad = chip->oob_poi[chip->badblockpos];
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 (res)
return res;
}
return 0;
}
/**
* nand_default_block_markbad - [DEFAULT] mark a block bad via bad block marker
* @mtd: MTD device structure