linux-kernel - [PATCH] mtd: spi-nor: core: correct the op.dummy.nbytes when check read operations

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Message-Id: <20251208-spi-nor-v1-1-f6669a645395@nxp.com>
Date: Mon, 08 Dec 2025 17:14:14 +0800
From: Haibo Chen <haibo.chen@....com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: Pratyush Yadav <p.yadav@...com>, linux-mtd@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
 Haibo Chen <haibo.chen@....com>
Subject: [PATCH] mtd: spi-nor: core: correct the op.dummy.nbytes when check
 read operations

When check read operation, need to setting the op.dummy.nbytes based
on current read operation rather than the nor->read_proto.

Fixes: 0e30f47232ab ("mtd: spi-nor: add support for DTR protocol")
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/mtd/spi-nor/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index d3f8a78efd3bf9032b807e81b7a8b77556367e71..09312300108e4ac4307934a983e74a5510f3e844 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2393,7 +2393,7 @@ static int spi_nor_spimem_check_readop(struct spi_nor *nor,
 	/* convert the dummy cycles to the number of bytes */
 	op.dummy.nbytes = (read->num_mode_clocks + read->num_wait_states) *
 			  op.dummy.buswidth / 8;
-	if (spi_nor_protocol_is_dtr(nor->read_proto))
+	if (spi_nor_protocol_is_dtr(read->proto))
 		op.dummy.nbytes *= 2;
 
 	return spi_nor_spimem_check_op(nor, &op);

---
base-commit: 82bcd04d124a4d84580ea4a8ba6b120db5f512e7
change-id: 20251208-spi-nor-5f4dd001f7e1

Best regards,
-- 
Haibo Chen <haibo.chen@....com>