linux-kernel - Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories

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Date:   Tue, 16 Oct 2018 14:17:54 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "richard@....at" <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "cyrille.pitchen@...rochip.com" <cyrille.pitchen@...rochip.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "Cristian.Birsan@...rochip.com" <Cristian.Birsan@...rochip.com>
Subject: Re: [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@...tlin.com> wrote:

> On Tue, 16 Oct 2018 09:51:47 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@....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;