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mtd: spi-nor: core: Check written SR value in spi_nor_write_16bit_sr_and_check()

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Read back Status Register 1 to ensure that the written byte match the
received value and return -EIO if read back test failed.

Without this patch, spi_nor_write_16bit_sr_and_check() only check the
second half of the 16bit. It causes errors like spi_nor_sr_unlock()
return success incorrectly when spi_nor_write_16bit_sr_and_check()
doesn't write SR successfully.

Fixes: 39d1e3340c ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
Signed-off-by: Chen-Tsung Hsieh <chentsung@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Michael Walle <michael@walle.cc>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20220126073227.3401275-1-chentsung@chromium.org
This commit is contained in:
Chen-Tsung Hsieh 2022-01-26 15:32:26 +08:00 committed by Pratyush Yadav
parent b2d229d4dd
commit 70dd83d737
1 changed files with 9 additions and 0 deletions
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9
drivers/mtd/spi-nor/core.c
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@ -788,6 +788,15 @@ static int spi_nor_write_16bit_sr_and_check(struct spi_nor *nor, u8 sr1)
if (ret)
return ret;
ret = spi_nor_read_sr(nor, sr_cr);
if (ret)
return ret;
if (sr1 != sr_cr[0]) {
dev_dbg(nor->dev, "SR: Read back test failed\n");
return -EIO;
}
if (nor->flags & SNOR_F_NO_READ_CR)
return 0;