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mtd: spi-nor: cadence-quadspi: Fix direct mode write timeouts 

Sometimes when writing large size files to flash in direct/memory mapped
mode, it is seen that flash write enable command times out with error:
[  503.146293] cadence-qspi 47040000.ospi: Flash command execution timed out.

This is because, we need to make sure previous direct write operation
is complete by polling for IDLE bit in CONFIG_REG before starting the
next operation.

Fix this by polling for IDLE bit after memory mapped write.

Fixes: a27f2eaf2b ("mtd: spi-nor: cadence-quadspi: Add support for direct access mode")
Cc: stable@vger.kernel.org
Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Vignesh R 2018-06-30 16:24:21 +05:30 committed by Boris Brezillon
parent 021c91791a
commit aa7eee8a14
1 changed files with 4 additions and 2 deletions
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6
drivers/mtd/spi-nor/cadence-quadspi.c
View File

@ -926,10 +926,12 @@ static ssize_t cqspi_write(struct spi_nor *nor, loff_t to,
if (ret)
return ret;
if (f_pdata->use_direct_mode)
if (f_pdata->use_direct_mode) {
memcpy_toio(cqspi->ahb_base + to, buf, len);
else
ret = cqspi_wait_idle(cqspi);
} else {
ret = cqspi_indirect_write_execute(nor, to, buf, len);
}
if (ret)
return ret;