linux-kernel - Re: [PATCH -next v4] mtd: nand: toshiba: Retrieve ECC requirements from extended ID

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Message-ID: <20180214202924.200caace@bbrezillon>
Date:   Wed, 14 Feb 2018 20:29:24 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     KOBAYASHI Yoshitake <yoshitake.kobayashi@...hiba.co.jp>
Cc:     boris.brezillon@...e-electrons.com, richard@....at,
        dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, cyrille.pitchen@...ev4u.fr,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v4] mtd: nand: toshiba: Retrieve ECC requirements
 from extended ID

On Wed, 14 Feb 2018 20:15:41 +0100
Boris Brezillon <boris.brezillon@...tlin.com> wrote:

> -linux-mmc
> +linux-mtd
> 
> On Thu, 15 Feb 2018 00:35:06 +0900
> KOBAYASHI Yoshitake <yoshitake.kobayashi@...hiba.co.jp> wrote:
> 
> > This patch enables support to read the ECC strength and size from the
> > NAND flash using Toshiba Memory SLC NAND extended-ID. This patch is
> > based on the information of the 6th ID byte of the Toshiba Memory SLC
> > NAND.  
> 
> This version looks good to me.
> 

Applied.

Thanks,

Boris

> > 
> > Signed-off-by: KOBAYASHI Yoshitake <yoshitake.kobayashi@...hiba.co.jp>
> > ---
> >  drivers/mtd/nand/nand_toshiba.c | 26 ++++++++++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> > 
> > diff --git a/drivers/mtd/nand/nand_toshiba.c b/drivers/mtd/nand/nand_toshiba.c
> > index 57df857..ab43f02 100644
> > --- a/drivers/mtd/nand/nand_toshiba.c
> > +++ b/drivers/mtd/nand/nand_toshiba.c
> > @@ -35,6 +35,32 @@ static void toshiba_nand_decode_id(struct nand_chip *chip)
> >  	    (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ &&
> >  	    !(chip->id.data[4] & 0x80) /* !BENAND */)
> >  		mtd->oobsize = 32 * mtd->writesize >> 9;
> > +
> > +	/*
> > +	 * Extract ECC requirements from 6th id byte.
> > +	 * For Toshiba SLC, ecc requrements are as follows:
> > +	 *  - 43nm: 1 bit ECC for each 512Byte is required.
> > +	 *  - 32nm: 4 bit ECC for each 512Byte is required.
> > +	 *  - 24nm: 8 bit ECC for each 512Byte is required.
> > +	 */
> > +	if (chip->id.len >= 6 && nand_is_slc(chip)) {
> > +		chip->ecc_step_ds = 512;
> > +		switch (chip->id.data[5] & 0x7) {
> > +		case 0x4:
> > +			chip->ecc_strength_ds = 1;
> > +			break;
> > +		case 0x5:
> > +			chip->ecc_strength_ds = 4;
> > +			break;
> > +		case 0x6:
> > +			chip->ecc_strength_ds = 8;
> > +			break;
> > +		default:
> > +			WARN(1, "Could not get ECC info");
> > +			chip->ecc_step_ds = 0;
> > +			break;
> > +		}
> > +	}
> >  }
> >  
> >  static int toshiba_nand_init(struct nand_chip *chip)  
> 
> 
> 



-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com