linux-kernel - Re: [PATCH v4 1/2] mtd: rawnand: fsl_ifc: fix FSL NAND driver to read all ONFI parameter pages

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Message-ID: <20180509161225.218fe332@bbrezillon>
Date:   Wed, 9 May 2018 16:12:25 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Jane Wan <Jane.Wan@...ia.com>
Cc:     miquel.raynal@...tlin.com, dwmw2@...radead.org,
        computersforpeace@...il.com, richard@....at, marek.vasut@...il.com,
        yamada.masahiro@...ionext.com, prabhakar.kushwaha@....com,
        shawnguo@...nel.org, jagdish.gediya@....com,
        shreeya.patel23498@...il.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ties.bos@...ia.com
Subject: Re: [PATCH v4 1/2] mtd: rawnand: fsl_ifc: fix FSL NAND driver to
 read all ONFI parameter pages

On Tue,  8 May 2018 14:19:53 -0700
Jane Wan <Jane.Wan@...ia.com> wrote:

> Per ONFI specification (Rev. 4.0), if the CRC of the first parameter page
> read is not valid, the host should read redundant parameter page copies.
> Fix FSL NAND driver to read the two redundant copies which are mandatory
> in the specification.
> 
> Signed-off-by: Jane Wan <Jane.Wan@...ia.com>

I'm gonna take this patch, but I'd like to make it clear: this is the
last time I accept fixes touching fsl_ifc_cmdfunc() for bugs that could
have been addressed by switching to ->exec_op() (note that I had a look
at a freescale datasheet, and I'm now 100% sure this driver can be
converted to ->exec_op()).

> ---
>  drivers/mtd/nand/raw/fsl_ifc_nand.c |   17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/fsl_ifc_nand.c b/drivers/mtd/nand/raw/fsl_ifc_nand.c
> index 61aae02..98aac1f 100644
> --- a/drivers/mtd/nand/raw/fsl_ifc_nand.c
> +++ b/drivers/mtd/nand/raw/fsl_ifc_nand.c
> @@ -342,9 +342,16 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
>  
>  	case NAND_CMD_READID:
>  	case NAND_CMD_PARAM: {
> +		/*
> +		 * For READID, read 8 bytes that are currently used.
> +		 * For PARAM, read all 3 copies of 256-bytes pages.
> +		 */
> +		int len = 8;
>  		int timing = IFC_FIR_OP_RB;
> -		if (command == NAND_CMD_PARAM)
> +		if (command == NAND_CMD_PARAM) {
>  			timing = IFC_FIR_OP_RBCD;
> +			len = 256 * 3;
> +		}
>  
>  		ifc_out32((IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
>  			  (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
> @@ -354,12 +361,8 @@ static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
>  			  &ifc->ifc_nand.nand_fcr0);
>  		ifc_out32(column, &ifc->ifc_nand.row3);
>  
> -		/*
> -		 * although currently it's 8 bytes for READID, we always read
> -		 * the maximum 256 bytes(for PARAM)
> -		 */
> -		ifc_out32(256, &ifc->ifc_nand.nand_fbcr);
> -		ifc_nand_ctrl->read_bytes = 256;
> +		ifc_out32(len, &ifc->ifc_nand.nand_fbcr);
> +		ifc_nand_ctrl->read_bytes = len;
>  
>  		set_addr(mtd, 0, 0, 0);
>  		fsl_ifc_run_command(mtd);