The Winbond "w25q128" (actual vendor name W25Q128JV) has exactly the same flags as the sibling device "w25q128jv". The devices both require unlocking to enable write access.

The actual product naming between devices vs the Linux strings in winbond.c:

0xef4018: "w25q128" W25Q128JV-IN/IQ/JQ 0xef7018: "w25q128jv" W25Q128JV-IM/JM

The latter device, "w25q128jv" supports features named DTQ and QPI, otherwise it is the same.

Not having the right flags has the annoying side effect that write access does not work.

After this patch I can write to the flash on the Inteno XG6846 router.

The flash memory also supports dual and quad SPI modes. This does not currently manifest, but by turning on SFDP parsing, the right SPI modes are emitted in /sys/kernel/debug/spi-nor/spi1.0/capabilities for this chip, so we also turn on this.

Since we now have determined that SFDP parsing works on the device, we also detect the geometry using SFDP.

After this dmesg and sysfs says: [ 1.062401] spi-nor spi1.0: w25q128 (16384 Kbytes) cat erasesize 65536 (16384*1024)/65536 = 256 sectors

spi-nor sysfs: cat jedec_id ef4018 cat manufacturer winbond cat partname w25q128 hexdump -v -C sfdp 00000000 53 46 44 50 05 01 00 ff 00 05 01 10 80 00 00 ff 00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000020 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000030 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000040 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000050 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000060 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000070 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 00000080 e5 20 f9 ff ff ff ff 07 44 eb 08 6b 08 3b 42 bb 00000090 fe ff ff ff ff ff 00 00 ff ff 40 eb 0c 20 0f 52 000000a0 10 d8 00 00 36 02 a6 00 82 ea 14 c9 e9 63 76 33 000000b0 7a 75 7a 75 f7 a2 d5 5c 19 f7 4d ff e9 30 f8 80

Cc: stable@vger.kernel.org Suggested-by: Michael Walle michael@walle.cc Reviewed-by: Michael Walle michael@walle.cc Signed-off-by: Linus Walleij linus.walleij@linaro.org --- Changes in v5: - Detect also geometry from the SFDP table. - Link to v4: https://lore.kernel.org/r/20230714-spi-nor-winbond-w25q128-v4-1-89c5971df343...

Changes in v4: - Fix up error in commit message. - Pick up Michael's ACK. - Link to v3: https://lore.kernel.org/r/20230714-spi-nor-winbond-w25q128-v3-1-bdb2192f079b...

Changes in v3: - Keep NO_SFDP_FLAGS(SECT_4K) around. - Update commit message - Link to v2: https://lore.kernel.org/r/20230712-spi-nor-winbond-w25q128-v2-1-50c9f1d58d6c...

Changes in v2: - Only add the write access flags. - Use SFDP parsing to properly detect the various available SPI modes. - Link to v1: https://lore.kernel.org/r/20230712-spi-nor-winbond-w25q128-v1-1-f78f3bb42a1c... --- drivers/mtd/spi-nor/winbond.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c index 834d6ba5ce70..63ba8e3a96f5 100644 --- a/drivers/mtd/spi-nor/winbond.c +++ b/drivers/mtd/spi-nor/winbond.c @@ -120,8 +120,9 @@ static const struct flash_info winbond_nor_parts[] = { NO_SFDP_FLAGS(SECT_4K) }, { "w25q80bl", INFO(0xef4014, 0, 64 * 1024, 16) NO_SFDP_FLAGS(SECT_4K) }, - { "w25q128", INFO(0xef4018, 0, 64 * 1024, 256) - NO_SFDP_FLAGS(SECT_4K) }, + { "w25q128", INFO(0xef4018, 0, 0, 0) + PARSE_SFDP + FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) }, { "w25q256", INFO(0xef4019, 0, 64 * 1024, 512) NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) .fixups = &w25q256_fixups },

--- base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5 change-id: 20230711-spi-nor-winbond-w25q128-321a602ee267

Best regards,