mtd: spi-nor: Add a post BFPT fixup for MX25L25635E

MX25L25635F and MX25L25635E share the same JEDEC-ID, but the F variant
supports 4-byte opcodes while the E variant doesn't. We need a way to
differentiate those 2 chips and set the SNOR_F_4B_OPCODES flag only for
the F variant.

Luckily, 4-byte opcode support is not the only difference: Fast Read
4-4-4 is only supported by the F variant, and this feature is
advertised in the BFPT table. Use this to decide when to set the
SNOR_F_4B_OPCODES flag.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index b22a8c5..575fccb 100644 (file)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1447,6 +1447,31 @@ static int macronix_quad_enable(struct spi_nor *nor);
                .addr_width = 3,                                        \
                .flags = SPI_NOR_NO_FR | SPI_S3AN,
 
+static int
+mx25l25635_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)
+{
+       /*
+        * MX25L25635F supports 4B opcodes but MX25L25635E does not.
+        * Unfortunately, Macronix has re-used the same JEDEC ID for both
+        * variants which prevents us from defining a new entry in the parts
+        * table.
+        * We need a way to differentiate MX25L25635E and MX25L25635F, and it
+        * seems that the F version advertises support for Fast Read 4-4-4 in
+        * its BFPT table.
+        */
+       if (bfpt->dwords[BFPT_DWORD(5)] & BFPT_DWORD5_FAST_READ_4_4_4)
+               nor->flags |= SNOR_F_4B_OPCODES;
+
+       return 0;
+}
+
+static struct spi_nor_fixups mx25l25635_fixups = {
+       .post_bfpt = mx25l25635_post_bfpt_fixups,
+};
+
 /* NOTE: double check command sets and memory organization when you add
  * more nor chips.  This current list focusses on newer chips, which
  * have been converging on command sets which including JEDEC ID.
@@ -1581,7 +1606,9 @@ static const struct flash_info spi_nor_ids[] = {
        { "mx25l12855e", INFO(0xc22618, 0, 64 * 1024, 256, 0) },
        { "mx25u12835f", INFO(0xc22538, 0, 64 * 1024, 256,
                         SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
-       { "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+       { "mx25l25635e", INFO(0xc22019, 0, 64 * 1024, 512,
+                        SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
+                        .fixups = &mx25l25635_fixups },
        { "mx25u25635f", INFO(0xc22539, 0, 64 * 1024, 512, SECT_4K | SPI_NOR_4B_OPCODES) },
        { "mx25l25655e", INFO(0xc22619, 0, 64 * 1024, 512, 0) },
        { "mx66l51235l", INFO(0xc2201a, 0, 64 * 1024, 1024, SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ | SPI_NOR_4B_OPCODES) },