[PATCH v2 3/6] mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from BFPT

[Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>]

Parse BFPT in order to retrieve the byte order in 8D-8D-8D mode.

Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Reviewed-by: Michael Walle <michael@xxxxxxxx>
Reviewed-by: Pratyush Yadav <p.yadav@xxxxxx>
---
 drivers/mtd/spi-nor/sfdp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index f5432cbd3daf..e049851a57a7 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -579,6 +579,7 @@ int spi_nor_set_4byte_addr_mode_wren_en4b_ex4b(struct spi_nor *nor, bool enable)
 #define BFPT_DWORD18_CMD_EXT_INV		(0x1UL << 29) /* Invert */
 #define BFPT_DWORD18_CMD_EXT_RES		(0x2UL << 29) /* Reserved */
 #define BFPT_DWORD18_CMD_EXT_16B		(0x3UL << 29) /* 16-bit opcode */
+#define BFPT_DWORD18_BYTE_ORDER_SWAPPED		BIT(31)
 
 /**
  * spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table.
@@ -832,6 +833,9 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 		return -EOPNOTSUPP;
 	}
 
+	if (bfpt.dwords[BFPT_DWORD(18)] & BFPT_DWORD18_BYTE_ORDER_SWAPPED)
+		nor->flags |= SNOR_F_DTR_SWAB16;
+
 	return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt);
 }
 
-- 
2.25.1