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[MTD] NAND: Remove empty block ECC workaround

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They fixed the hardware so that ECC doesn't fail on reading an empty
block.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2006-10-27 22:12:02 +03:00
parent 7608194c4a
commit 63a1423763
1 changed files with 1 additions and 27 deletions
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28
drivers/mtd/nand/cafe.c
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@ -356,26 +356,6 @@ static int cafe_nand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
* The hw generator calculates the error syndrome automatically. Therefor * The hw generator calculates the error syndrome automatically. Therefor
* we need a special oob layout and handling. * we need a special oob layout and handling.
*/ */
static unsigned short cafe_empty_syndromes[8] = { 4095, 748, 2629, 2920, 875, 1454, 51, 1456 };
static int is_all_ff(unsigned char *buf, int len)
{
unsigned long *lbuf = (void *)buf;
int i;
for (i=0; i < (len/sizeof(long)); i++) {
if (lbuf[i] != ~0UL)
return 0;
}
i *= sizeof(long);
for (; i< len; i++) {
if (buf[i] != 0xff)
return 0;
}
return 1;
}
static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip, static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf) uint8_t *buf)
{ {
@ -398,13 +378,7 @@ static int cafe_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
syn[i+1] = (tmp >> 16) & 0xfff; syn[i+1] = (tmp >> 16) & 0xfff;
} }
/* FIXME: http://dev.laptop.org/ticket/215 */ if ((i = cafe_correct_ecc(buf, syn)) < 0) {
if (!memcmp(syn, cafe_empty_syndromes, sizeof(syn))
&& is_all_ff(chip->oob_poi, 14)
&& is_all_ff(buf, mtd->writesize)) {
dev_dbg(&cafe->pdev->dev, "ECC error reported on empty block\n");
/* It was an empty block. Nothing to fix here except the hardware */
} else if ((i = cafe_correct_ecc(buf, syn)) < 0) {
dev_dbg(&cafe->pdev->dev, "Failed to correct ECC\n"); dev_dbg(&cafe->pdev->dev, "Failed to correct ECC\n");
mtd->ecc_stats.failed++; mtd->ecc_stats.failed++;
} else { } else {