linux-kernel - [PATCH v2] mtd: spi-nor: fsl-quadspi: fix read error for flash size larger than 16MB

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Date:   Tue, 28 Aug 2018 21:21:16 +0800
From:   Liu Xiang <liu.xiang6@....com.cn>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        han.xu@....com, marek.vasut@...il.com, dwmw2@...radead.org,
        computersforpeace@...il.com, boris.brezillon@...tlin.com,
        richard@....at, liuxiang_1999@....com,
        Liu Xiang <liu.xiang6@....com.cn>
Subject: [PATCH v2] mtd: spi-nor: fsl-quadspi: fix read error for flash size  larger than 16MB

If the size of spi-nor flash is larger than 16MB, the read_opcode
is set to SPINOR_OP_READ_1_1_4_4B, and fsl_qspi_get_seqid() will
return -EINVAL when cmd is SPINOR_OP_READ_1_1_4_4B. This can
cause read operation fail.

---
v2:
  add Fixes tag and CC stable suggested by Boris.
---

Fixes: e46ecda764dc ("mtd: spi-nor: Add Freescale QuadSPI driver")
Cc: <stable@...r.kernel.org>
Signed-off-by: Liu Xiang <liu.xiang6@....com.cn>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 7d9620c..64304a3 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -478,6 +478,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 {
 	switch (cmd) {
 	case SPINOR_OP_READ_1_1_4:
+	case SPINOR_OP_READ_1_1_4_4B:
 		return SEQID_READ;
 	case SPINOR_OP_WREN:
 		return SEQID_WREN;
-- 
1.9.1