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mtd: cfi_cmdset_0002: Use chip_good() to retry in do_write_oneword()

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As reported by the OpenWRT team, write requests sometimes fail on some
platforms.
Currently to check the state chip_ready() is used correctly as described by
the flash memory S29GL256P11TFI01 datasheet.
Also chip_good() is used to check if the write is succeeded and it was
implemented by the commit fb4a90bfcd ("[MTD] CFI-0002 - Improve error
checking").
But actually the write failure is caused on some platforms and also it can
be fixed by using chip_good() to check the state and retry instead.
Also it seems that it is caused after repeated about 1,000 times to retry
the write one word with the reset command.
By using chip_good() to check the state to be done it can be reduced the
retry with reset.
It is depended on the actual flash chip behavior so the root cause is
unknown.

Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Cc: linux-mtd@lists.infradead.org
Cc: stable@vger.kernel.org
Reported-by: Fabio Bettoni <fbettoni@gmail.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>
[vigneshr@ti.com: Fix a checkpatch warning]
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Tokunori Ikegami 2019-08-06 04:03:18 +09:00 committed by Vignesh Raghavendra
parent f454b43a56
commit 37c673ade3
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/mtd/chips/cfi_cmdset_0002.c
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@ -1717,31 +1717,37 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
continue;
}
/*
* We check "time_after" and "!chip_good" before checking
* "chip_good" to avoid the failure due to scheduling.
*/
if (time_after(jiffies, timeo) &&
!chip_ready(map, chip, adr)) {
!chip_good(map, chip, adr, datum)) {
xip_enable(map, chip, adr);
printk(KERN_WARNING "MTD %s(): software timeout\n", __func__);
xip_disable(map, chip, adr);
ret = -EIO;
break;
}
if (chip_ready(map, chip, adr))
if (chip_good(map, chip, adr, datum))
break;
/* Latency issues. Drop the lock, wait a while and retry */
UDELAY(map, chip, adr, 1);
}
/* Did we succeed? */
if (!chip_good(map, chip, adr, datum)) {
if (ret) {
/* reset on all failures. */
cfi_check_err_status(map, chip, adr);
map_write(map, CMD(0xF0), chip->start);
/* FIXME - should have reset delay before continuing */
if (++retry_cnt <= MAX_RETRIES)
if (++retry_cnt <= MAX_RETRIES) {
ret = 0;
goto retry;
ret = -EIO;
}
}
xip_enable(map, chip, adr);
op_done: