-linux-mmc
+linux-mtd

On Thu, 15 Feb 2018 00:35:06 +0900
KOBAYASHI Yoshitake <yoshitake.kobaya...@toshiba.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.

> 
> Signed-off-by: KOBAYASHI Yoshitake <yoshitake.kobaya...@toshiba.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

Reply via email to