mtd: spi-nor: sfdp: Get the 8D-8D-8D byte order from BFPT

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

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
[varshini.rajendran@microchip.com: Ported to 6.6.9 by fixing merge
conflicts]
Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>

Author: ambarus

drivers/mtd/spi-nor/sfdp.c

@@ -650,6 +650,9 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
 		return -EOPNOTSUPP;
 	}
 
+	if (bfpt.dwords[SFDP_DWORD(18)] & BFPT_DWORD18_BYTE_ORDER_SWAPPED)
+		nor->flags |= SNOR_F_DTR_BSWAP16;
+
 	return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt);
 }
 

drivers/mtd/spi-nor/sfdp.h

@@ -123,6 +123,7 @@ struct sfdp_bfpt {
 #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)
 
 struct sfdp_parameter_header {
 	u8		id_lsb;