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SubjectRe: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories
On Tue, 16 Oct 2018 14:04:11 +0200
Boris Brezillon <boris.brezillon@bootlin.com> wrote:

> On Tue, 16 Oct 2018 09:51:47 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> wrote:
>
> > Hi Tudor,
> >
> > This patch is breaking the 1-4-4 Read protocol for the spansion flash "s25fl512s".
> >
> > Without this patch read request command for Quad mode, 4-byte enable, is coming as 0xEC i.e. SPINOR_OP_READ_1_4_4_4B.
> > But after applying this patch, read request command for Quad mode is coming as 0x6C i.e. SPINOR_OP_READ_1_1_4_4B.
> >
> > This flash also supports non-uniform erase.
> > Can you please check and provide some suggestion?
>
> Are you sure the regression comes from this patch? I suspect your bug
> comes from 41fe242979e4 ("mtd: spi-nor: fsl-quadspi: fix read error for
> flash size larger than 16MB").

I guess you're testing with an fsl-qspi controller, right? Can you try
with this patch?

--->8---

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 1ff3430f82c8..c47fe70c9f98 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -477,9 +477,6 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
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;
case SPINOR_OP_WRDI:
@@ -490,8 +487,6 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
return SEQID_SE;
case SPINOR_OP_CHIP_ERASE:
return SEQID_CHIP_ERASE;
- case SPINOR_OP_PP:
- return SEQID_PP;
case SPINOR_OP_RDID:
return SEQID_RDID;
case SPINOR_OP_WRSR:
@@ -503,7 +498,11 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
case SPINOR_OP_BRWR:
return SEQID_BRWR;
default:
- if (cmd == q->nor[0].erase_opcode)
+ if (cmd == q->nor[0].read_opcode)
+ return SEQID_READ;
+ else if (cmd == q->nor[0].program_opcode)
+ return SEQID_PP;
+ else if (cmd == q->nor[0].erase_opcode)
return SEQID_SE;
dev_err(q->dev, "Unsupported cmd 0x%.2x\n", cmd);
break;
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