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mtd: spi-nor: Clear WEL bit when erase or program errors occur

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When an Erase or Program error occurs on a spansion/cypress or a
micron flash, the WEL bit remains set to one and should be cleared
with a WRDI command in order to protect against inadvertent writes
that can possible corrupt the contents of the memory.

Winbond, macronix, gd, etc., do not support the E_ERR and P_ERR bits in the
Status Register and always clear the WEL bit regardless of the outcome
of the erase or page program operation (ex w25q40bw, MX25L25635E).

Issue a WRDI command when erase or page program errors occur.

Reported-by: John Garry <john.garry@huawei.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Tested-by: John Garry <john.garry@huawei.com>
This commit is contained in:
Tudor Ambarus 2020-03-23 19:50:40 +02:00
parent 6d4e346435
commit e0fe5339d4
No known key found for this signature in database
GPG Key ID: 4B554F47A58D14E9
1 changed files with 22 additions and 0 deletions
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22
drivers/mtd/spi-nor/core.c
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@ -559,6 +559,17 @@ static int spi_nor_sr_ready(struct spi_nor *nor)
dev_err(nor->dev, "Programming Error occurred\n");
spi_nor_clear_sr(nor);
/*
* WEL bit remains set to one when an erase or page program
* error occurs. Issue a Write Disable command to protect
* against inadvertent writes that can possibly corrupt the
* contents of the memory.
*/
ret = spi_nor_write_disable(nor);
if (ret)
return ret;
return -EIO;
}
@ -615,6 +626,17 @@ static int spi_nor_fsr_ready(struct spi_nor *nor)
"Attempted to modify a protected sector.\n");
spi_nor_clear_fsr(nor);
/*
* WEL bit remains set to one when an erase or page program
* error occurs. Issue a Write Disable command to protect
* against inadvertent writes that can possibly corrupt the
* contents of the memory.
*/
ret = spi_nor_write_disable(nor);
if (ret)
return ret;
return -EIO;
}