linux-kernel - [PATCH v2] mtd: spi-nor: Correct flags for Winbond w25q128

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Date:   Wed, 12 Jul 2023 23:59:36 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Tudor Ambarus <tudor.ambarus@...aro.org>,
        Pratyush Yadav <pratyush@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2] mtd: spi-nor: Correct flags for Winbond w25q128

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

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.

Cc: stable@...r.kernel.org
Suggested-by: Michael Walle <michael@...le.cc>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
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@linaro.org
---
 drivers/mtd/spi-nor/winbond.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
index 834d6ba5ce70..6c82e525c801 100644
--- a/drivers/mtd/spi-nor/winbond.c
+++ b/drivers/mtd/spi-nor/winbond.c
@@ -121,7 +121,8 @@ static const struct flash_info winbond_nor_parts[] = {
 	{ "w25q80bl", INFO(0xef4014, 0, 64 * 1024,  16)
 		NO_SFDP_FLAGS(SECT_4K) },
 	{ "w25q128", INFO(0xef4018, 0, 64 * 1024, 256)
-		NO_SFDP_FLAGS(SECT_4K) },
+		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,
-- 
Linus Walleij <linus.walleij@...aro.org>