[PATCH v3] mtd: spi-nor: fix nor->addr_width when its value configured from SFDP does not match the actual width

[Liu Xiang <liu.xiang6@zte.com.cn>]

Some is25lp256 get BFPT_DWORD1_ADDRESS_BYTES_3_ONLY from BFPT table for
address width. But in actual fact the flash can support 4-byte address.
So we should fix it.

Suggested-by: Boris Brezillon <bbrezillon@kernel.org>
Suggested-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Liu Xiang <liu.xiang6@zte.com.cn>
---

Changes in v3:
 add a fixup for is25lp256 to solve the address width problem.

 drivers/mtd/spi-nor/spi-nor.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 6e13bbd..d252a66 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1682,6 +1682,28 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
 		.flags = SPI_NOR_NO_FR | SPI_S3AN,
 
 static int
+is25lp256_post_bfpt_fixups(struct spi_nor *nor,
+			   const struct sfdp_parameter_header *bfpt_header,
+			   const struct sfdp_bfpt *bfpt,
+			   struct spi_nor_flash_parameter *params)
+{
+	/*
+	 * IS25LP256 supports 4B opcodes.
+	 * Unfortunately, some devices get BFPT_DWORD1_ADDRESS_BYTES_3_ONLY
+	 * from BFPT table for address width. We should fix it.
+	 */
+	if ((bfpt->dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) ==
+		BFPT_DWORD1_ADDRESS_BYTES_3_ONLY)
+		nor->addr_width = 4;
+
+	return 0;
+}
+
+static struct spi_nor_fixups is25lp256_fixups = {
+	.post_bfpt = is25lp256_post_bfpt_fixups,
+};
+
+static int
 mx25l25635_post_bfpt_fixups(struct spi_nor *nor,
 			    const struct sfdp_parameter_header *bfpt_header,
 			    const struct sfdp_bfpt *bfpt,
@@ -1818,7 +1840,8 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
 			SECT_4K | SPI_NOR_DUAL_READ) },
 	{ "is25lp256",  INFO(0x9d6019, 0, 64 * 1024, 512,
 			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
-			SPI_NOR_4B_OPCODES) },
+			SPI_NOR_4B_OPCODES)
+			.fixups = &is25lp256_fixups },
 	{ "is25wp032",  INFO(0x9d7016, 0, 64 * 1024,  64,
 			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
 	{ "is25wp064",  INFO(0x9d7017, 0, 64 * 1024, 128,
-- 
1.9.1


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