linux-kernel - Re: [PATCH v3] mtd: spinand: Fix ECC status and OOB layout for Toshiba TC58CVG2S0H

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Date:   Fri, 7 Dec 2018 09:00:41 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peron.clem@...il.com" <peron.clem@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH v3] mtd: spinand: Fix ECC status and OOB layout for
 Toshiba TC58CVG2S0H

Hi Schrempf, Clément,

Schrempf Frieder <frieder.schrempf@...tron.de> wrote on Mon, 3 Dec 2018
08:01:38 +0000:

> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> When reading the status of the on-chip ECC, the Toshiba chip returns
> two different states for reporting corrected bitflips. We should check
> for both of them.
> 
> Also return the free OOB bytes as one contiguous area, instead of
> multiple sections.
> 
> Suggested-by: Clément Péron <peron.clem@...il.com>
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
> Acked-by: Clément Péron <peron.clem@...il.com>
> ---
> Changes for v3:
> ===============
> * Add Acked-by
> * Add comment for BBM in OOB layout
> 
> Changes for v2:
> ===============
> * Remove the changes to the ECC bytes in the OOB layout
> ---
>  drivers/mtd/nand/spi/toshiba.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/nand/spi/toshiba.c b/drivers/mtd/nand/spi/toshiba.c
> index 294bcf6..0812655 100644
> --- a/drivers/mtd/nand/spi/toshiba.c
> +++ b/drivers/mtd/nand/spi/toshiba.c
> @@ -11,6 +11,7 @@
>  #include <linux/mtd/spinand.h>
>  
>  #define SPINAND_MFR_TOSHIBA		0x98
> +#define TOSH_STATUS_ECC_HAS_BITFLIPS_T	(3 << 4)
>  
>  static SPINAND_OP_VARIANTS(read_cache_variants,
>  		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
> @@ -33,19 +34,18 @@ static int tc58cvg2s0h_ooblayout_ecc(struct mtd_info *mtd, int section,
>  	region->offset = 128 + 16 * section;
>  	region->length = 16;
>  
> -
>  	return 0;
>  }
>  
>  static int tc58cvg2s0h_ooblayout_free(struct mtd_info *mtd, int section,
>  				      struct mtd_oob_region *region)
>  {
> -	if (section > 7)
> +	if (section > 0)
>  		return -ERANGE;
>  
> -	region->offset = 2 + 16 * section;
> -	region->length = 14;
> -
> +	/* 2 bytes reserved for BBM */
> +	region->offset = 2;
> +	region->length = 126;
>  
>  	return 0;
>  }
> @@ -70,6 +70,7 @@ static int tc58cvg2s0h_ecc_get_status(struct spinand_device *spinand,
>  		return -EBADMSG;
>  
>  	case STATUS_ECC_HAS_BITFLIPS:
> +	case TOSH_STATUS_ECC_HAS_BITFLIPS_T:
>  		/*
>  		 * Let's try to retrieve the real maximum number of bitflips
>  		 * in order to avoid forcing the wear-leveling layer to move

If you don't mind, I would like to squash this with the original patch.
What about also adding Clement's Acked-by to it?


Thanks,
Miquèl