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

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Message-ID: <VI1PR04MB1038B7650F887549CA5EE22B99FF0@VI1PR04MB1038.eurprd04.prod.outlook.com>
Date:   Wed, 17 Oct 2018 01:54:01 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     Boris Brezillon <boris.brezillon@...tlin.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

Hi Boris,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> Sent: Tuesday, October 16, 2018 5:48 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> Cc: Tudor Ambarus <tudor.ambarus@...rochip.com>; marek.vasut@...il.com;
> dwmw2@...radead.org; computersforpeace@...il.com; richard@....at;
> linux-kernel@...r.kernel.org; nicolas.ferre@...rochip.com;
> cyrille.pitchen@...rochip.com; linux-mtd@...ts.infradead.org; linux-arm-
> kernel@...ts.infradead.org; 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?

I am testing nxp-flexspi controller and doing just read of small size 0x200.
Also 1-1-1 protocol i.e. spi-rx/tx-bus-width as 1 is working fine for this flash.

Without this patch read from 1-4-4 protocol is working correctly.

--
Regards
Yogesh Gaur

> 
> --->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;