[PATCH] mtd: spinand: macronix: Fix ECC Status Read

[li.haolin at qq.com]

From: Haolin Li <li.haolin at qq.com>

According to datasheet, the upper four bits are reserved or used for
reflecting the ECC status of the accumulated pages. The error bits
number for the worst segment of the current page is encoded on lower
four bits. Fix it by masking the upper bits.

This same issue has been already fixed in the linux kernel by:
"mtd: spinand: macronix: Fix ECC Status Read"
(sha1: f4cb4d7b46f6409382fd981eec9556e1f3c1dc5d)

Apply the same fix in the U-Boot driver.

Signed-off-by: Haolin Li <li.haolin at qq.com>
---
 drivers/mtd/nand/spi/macronix.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/spi/macronix.c b/drivers/mtd/nand/spi/macronix.c
index f4a8e81639..6d643a8000 100644
--- a/drivers/mtd/nand/spi/macronix.c
+++ b/drivers/mtd/nand/spi/macronix.c
@@ -14,6 +14,8 @@
 #include <linux/mtd/spinand.h>
 
 #define SPINAND_MFR_MACRONIX		0xC2
+#define MACRONIX_ECCSR_MASK		0x0F
+
 
 static SPINAND_OP_VARIANTS(read_cache_variants,
 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
@@ -59,7 +61,13 @@ static int mx35lf1ge4ab_get_eccsr(struct spinand_device *spinand, u8 *eccsr)
 					  SPI_MEM_OP_DUMMY(1, 1),
 					  SPI_MEM_OP_DATA_IN(1, eccsr, 1));
 
-	return spi_mem_exec_op(spinand->slave, &op);
+	int ret = spi_mem_exec_op(spinand->slave, &op);
+
+	if (ret)
+		return ret;
+
+	*eccsr &= MACRONIX_ECCSR_MASK;
+	return 0;
 }
 
 static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand,
-- 
2.25.1