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mtd: nand: diskonchip: remove custom 'erased check' implementation 

The diskonchip driver is manually checking for 'erased pages' while
correcting ECC bytes.
This logic can now done by the core infrastructure, and can thus be removed
from this driver.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Boris BREZILLON 2015-12-30 20:39:52 +01:00 committed by Brian Norris
parent bc29c95d2e
commit cc01e6075c
1 changed files with 3 additions and 35 deletions
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38
drivers/mtd/nand/diskonchip.c
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@ -74,10 +74,6 @@ struct doc_priv {
int (*late_init)(struct mtd_info *mtd);
};
/* This is the syndrome computed by the HW ecc generator upon reading an empty
page, one with all 0xff for data and stored ecc code. */
static u_char empty_read_syndrome[6] = { 0x26, 0xff, 0x6d, 0x47, 0x73, 0x7a };
/* This is the ecc value computed by the HW ecc generator upon writing an empty
page, one with all 0xff for data. */
static u_char empty_write_ecc[6] = { 0x4b, 0x00, 0xe2, 0x0e, 0x93, 0xf7 };
@ -912,7 +908,6 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
void __iomem *docptr = doc->virtadr;
uint8_t calc_ecc[6];
volatile u_char dummy;
int emptymatch = 1;
/* flush the pipeline */
if (DoC_is_2000(doc)) {
@ -936,37 +931,9 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
calc_ecc[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
else
calc_ecc[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
if (calc_ecc[i] != empty_read_syndrome[i])
emptymatch = 0;
}
/* If emptymatch=1, the read syndrome is consistent with an
all-0xff data and stored ecc block. Check the stored ecc. */
if (emptymatch) {
for (i = 0; i < 6; i++) {
if (read_ecc[i] == 0xff)
continue;
emptymatch = 0;
break;
}
}
/* If emptymatch still =1, check the data block. */
if (emptymatch) {
/* Note: this somewhat expensive test should not be triggered
often. It could be optimized away by examining the data in
the readbuf routine, and remembering the result. */
for (i = 0; i < 512; i++) {
if (dat[i] == 0xff)
continue;
emptymatch = 0;
break;
}
}
/* If emptymatch still =1, this is almost certainly a freshly-
erased block, in which case the ECC will not come out right.
We'll suppress the error and tell the caller everything's
OK. Because it is. */
if (!emptymatch)
ret = doc_ecc_decode(rs_decoder, dat, calc_ecc);
ret = doc_ecc_decode(rs_decoder, dat, calc_ecc);
if (ret > 0)
printk(KERN_ERR "doc200x_correct_data corrected %d errors\n", ret);
}
@ -1586,6 +1553,7 @@ static int __init doc_probe(unsigned long physadr)
nand->ecc.size = 512;
nand->ecc.bytes = 6;
nand->ecc.strength = 2;
nand->ecc.options = NAND_ECC_GENERIC_ERASED_CHECK;
nand->bbt_options = NAND_BBT_USE_FLASH;
/* Skip the automatic BBT scan so we can run it manually */
nand->options |= NAND_SKIP_BBTSCAN;