[PATCH v3 26/32] mtd: spi-nor: Extend the QE Read Back test to the entire SR byte

Tudor.Ambarus
2019-10-29T11:17:46Z

From: Tudor Ambarus <tudor.ambarus@microchip.com>

Extend the Quad Enable Read Back test to the entire Status
Register byte. Make sure that other bits were not changed.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
drivers/mtd/spi-nor/spi-nor.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 0dcc4f12e4de..55a12a1d710e 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2047,20 +2047,7 @@ static int macronix_quad_enable(struct spi_nor *nor)

nor->bouncebuf[0] |= SR_QUAD_EN_MX;

- ret = spi_nor_write_sr(nor, &nor->bouncebuf[0], 1);
- if (ret)
- return ret;
-
- ret = spi_nor_read_sr(nor, &nor->bouncebuf[0]);
- if (ret)
- return ret;
-
- if (!(nor->bouncebuf[0] & SR_QUAD_EN_MX)) {
- dev_err(nor->dev, "Macronix Quad bit not set\n");
- return -EIO;
- }
-
- return 0;
+ return spi_nor_write_sr1_and_check(nor, nor->bouncebuf[0]);
}

/**
@@ -2108,6 +2095,7 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
{
u8 *sr_cr = nor->bouncebuf;
int ret;
+ u8 sr_written;

/* Check current Quad Enable bit value. */
ret = spi_nor_read_cr(nor, &sr_cr[1]);
@@ -2128,13 +2116,15 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
if (ret)
return ret;

+ sr_written = sr_cr[1];
+
/* Read back and check it. */
ret = spi_nor_read_cr(nor, &sr_cr[1]);
if (ret)
return ret;

- if (!(sr_cr[1] & CR_QUAD_EN_SPAN)) {
- dev_err(nor->dev, "Spansion Quad bit not set\n");
+ if (sr_cr[1] != sr_written) {
+ dev_err(nor->dev, "SR2: Read back test failed\n");
return -EIO;
}

@@ -2157,6 +2147,7 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
{
u8 *sr2 = nor->bouncebuf;
int ret;
+ u8 sr2_written;

/* Check current Quad Enable bit value. */
ret = spi_nor_read_sr2(nor, sr2);
@@ -2172,13 +2163,15 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
if (ret)
return ret;

+ sr2_written = *sr2;
+
/* Read back and check it. */
ret = spi_nor_read_sr2(nor, sr2);
if (ret)
return ret;

- if (!(*sr2 & SR2_QUAD_EN_BIT7)) {
- dev_err(nor->dev, "SR2 Quad bit not set\n");
+ if (*sr2 != sr2_written) {
+ dev_err(nor->dev, "Read back test failed\n");
return -EIO;
}

--
2.9.5