lkml.org 
[lkml]   [2019]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 14/20] mtd: spi-nor: Extend the QE Read Back test to the entire SR byte
Date
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 f96bc80c0ed1..08fd2c97897d 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, 1);
- if (ret)
- return ret;
-
- ret = spi_nor_read_sr(nor, nor->bouncebuf);
- if (ret)
- return ret;
-
- if (!(nor->bouncebuf[0] & SR_QUAD_EN_MX)) {
- dev_dbg(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_dbg(nor->dev, "Spansion Quad bit not set\n");
+ if (sr_cr[1] != sr_written) {
+ dev_dbg(nor->dev, "CR: 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_dbg(nor->dev, "SR2 Quad bit not set\n");
+ if (*sr2 != sr2_written) {
+ dev_dbg(nor->dev, "SR2: Read back test failed\n");
return -EIO;
}

--
2.9.5
\
 
 \ /
  Last update: 2019-11-02 12:25    [W:0.341 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site