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@@ -0,0 +1,60 @@
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+From: Mantas Pucka <[email protected]>
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+To: [email protected]
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+Subject: [PATCH] mtd: spi-nor: fix 4-byte opcode support for w25q256
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+Date: Wed, 15 Apr 2020 16:48:30 +0300
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+Message-ID: <[email protected]>
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+
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+There are 2 different chips (w25q256fv and w25q256jv) that share
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+the same JEDEC ID. Only w25q256jv fully supports 4-byte opcodes.
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+Use SFDP header version to differentiate between them.
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+
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+for OpenWRT only: rebased to linux-v5.4
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+
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+Signed-off-by: Mantas Pucka <[email protected]>
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+---
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+
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+--- a/drivers/mtd/spi-nor/spi-nor.c
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++++ b/drivers/mtd/spi-nor/spi-nor.c
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+@@ -2170,6 +2170,32 @@ static struct spi_nor_fixups gd25q256_fi
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+ .default_init = gd25q256_default_init,
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+ };
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+
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++static int
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++w25q256_post_bfpt_fixups(struct spi_nor *nor,
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++ const struct sfdp_parameter_header *bfpt_header,
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++ const struct sfdp_bfpt *bfpt,
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++ struct spi_nor_flash_parameter *params)
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++{
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++ /*
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++ * W25Q256JV supports 4B opcodes but W25Q256FV does not.
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++ * Unfortunately, Winbond has re-used the same JEDEC ID for both
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++ * variants which prevents us from defining a new entry in the parts
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++ * table.
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++ * To differentiate between W25Q256JV and W25Q256FV check SFDP header
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++ * version: only JV has JESD216A compliant structure (version 5)
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++ */
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++
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++ if (bfpt_header->major == SFDP_JESD216_MAJOR &&
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++ bfpt_header->minor == SFDP_JESD216A_MINOR)
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++ nor->flags |= SNOR_F_4B_OPCODES;
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++
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++ return 0;
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++}
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++
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++static struct spi_nor_fixups w25q256_fixups = {
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++ .post_bfpt = w25q256_post_bfpt_fixups,
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++};
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++
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+ /* NOTE: double check command sets and memory organization when you add
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+ * more nor chips. This current list focusses on newer chips, which
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+ * have been converging on command sets which including JEDEC ID.
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+@@ -2508,7 +2534,8 @@ static const struct flash_info spi_nor_i
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+ { "w25q80", INFO(0xef5014, 0, 64 * 1024, 16, SECT_4K) },
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+ { "w25q80bl", INFO(0xef4014, 0, 64 * 1024, 16, SECT_4K) },
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+ { "w25q128", INFO(0xef4018, 0, 64 * 1024, 256, SECT_4K) },
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+- { "w25q256", INFO(0xef4019, 0, 64 * 1024, 512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
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++ { "w25q256", INFO(0xef4019, 0, 64 * 1024, 512, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
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++ .fixups = &w25q256_fixups },
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+ { "w25q256jvm", INFO(0xef7019, 0, 64 * 1024, 512,
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+ SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
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+ { "w25m512jv", INFO(0xef7119, 0, 64 * 1024, 1024,
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Mantas Pucka