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

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Date:   Fri, 11 Mar 2022 10:01:44 +0200
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <p.yadav@...com>, <michael@...le.cc>, <broonie@...nel.org>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <nicolas.ferre@...rochip.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH v2 3/6] 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@...rochip.com>
Reviewed-by: Michael Walle <michael@...le.cc>
Reviewed-by: Pratyush Yadav <p.yadav@...com>
---
 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