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Wed, 15 Jul 2026 13:37:24 -0700 (PDT) Received: from NoteBook ([37.153.34.175]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b01ca9dde5sm4422923e87.38.2026.07.15.13.37.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2026 13:37:23 -0700 (PDT) From: Aleksandr Mineev To: Miquel Raynal Cc: Richard Weinberger , Vignesh Raghavendra , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Aleksandr Mineev Subject: [PATCH] mtd: spinand: fmsh: fix FM25G01B/FM25G02B Quad I/O read dummy cycles Date: Wed, 15 Jul 2026 23:36:02 +0300 Message-ID: <20260715203602.1462-1-sanderrrs@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260715_133728_462610_EB5D829F X-CRM114-Status: GOOD ( 10.70 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org The FM25G01B/FM25G02B datasheets specify a single dummy byte for the 0xEB Quad I/O read-from-cache operation, but the generic read_cache_variants set uses two dummy bytes for the 1S-4S-4S variant. The extra dummy byte shifts the data phase and returns corrupted data with no ECC error, breaking boot on boards using these chips. Use a dedicated read-from-cache variant set with ndummy=1 for the 1S-4S-4S (0xEB) operation. FM25G01B datasheet: https://www.fmsh.com/nvm/FM25G01B_ds_eng.pdf FM25G02B datasheet: https://www.fmsh.com/nvm/FM25G02B_ds_eng.pdf Fixes: d5a5c9eb2ee9 ("mtd: spinand: fmsh: add support for FM25G{01,02}B") Signed-off-by: Aleksandr Mineev --- drivers/mtd/nand/spi/fmsh.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/nand/spi/fmsh.c b/drivers/mtd/nand/spi/fmsh.c index be5db9f9502b..6352e9c9e502 100644 --- a/drivers/mtd/nand/spi/fmsh.c +++ b/drivers/mtd/nand/spi/fmsh.c @@ -44,6 +44,14 @@ static SPINAND_OP_VARIANTS(update_cache_variants, SPINAND_PROG_LOAD_1S_1S_4S_OP(false, 0, NULL, 0), SPINAND_PROG_LOAD_1S_1S_1S_OP(false, 0, NULL, 0)); +static SPINAND_OP_VARIANTS(fm25g_read_cache_variants, + SPINAND_PAGE_READ_FROM_CACHE_1S_4S_4S_OP(0, 1, NULL, 0, 0), + SPINAND_PAGE_READ_FROM_CACHE_1S_1S_4S_OP(0, 1, NULL, 0, 0), + SPINAND_PAGE_READ_FROM_CACHE_1S_2S_2S_OP(0, 1, NULL, 0, 0), + SPINAND_PAGE_READ_FROM_CACHE_1S_1S_2S_OP(0, 1, NULL, 0, 0), + SPINAND_PAGE_READ_FROM_CACHE_FAST_1S_1S_1S_OP(0, 1, NULL, 0, 0), + SPINAND_PAGE_READ_FROM_CACHE_1S_1S_1S_OP(0, 1, NULL, 0, 0)); + static int fm25g01b_ooblayout_ecc(struct mtd_info *mtd, int section, struct mtd_oob_region *region) { @@ -192,7 +200,7 @@ static const struct spinand_info fmsh_spinand_table[] = { SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xd1), NAND_MEMORG(1, 2048, 128, 64, 1024, 21, 1, 1, 1), NAND_ECCREQ(8, 528), - SPINAND_INFO_OP_VARIANTS(&read_cache_variants, + SPINAND_INFO_OP_VARIANTS(&fm25g_read_cache_variants, &write_cache_variants, &update_cache_variants), SPINAND_HAS_QE_BIT, @@ -202,7 +210,7 @@ static const struct spinand_info fmsh_spinand_table[] = { SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xd2), NAND_MEMORG(1, 2048, 128, 64, 2048, 41, 1, 1, 1), NAND_ECCREQ(8, 528), - SPINAND_INFO_OP_VARIANTS(&read_cache_variants, + SPINAND_INFO_OP_VARIANTS(&fm25g_read_cache_variants, &write_cache_variants, &update_cache_variants), SPINAND_HAS_QE_BIT, -- 2.54.0 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/