[PATCH v4 14/20] mtd: spi-nor: Extend the QE Read Back test to the entire SR byte

[<Tudor.Ambarus@xxxxxxxxxxxxx>]

From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
 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


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