linux-kernel - Re: [PATCH v2 3/4] mtd: rawnand: ESMT: Also use the last page for bad block markers

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Message-ID: <20190122172732.6cbcffec@bbrezillon>
Date:   Tue, 22 Jan 2019 17:27:32 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>
Cc:     "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "richard@....at" <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>
Subject: Re: [PATCH v2 3/4] mtd: rawnand: ESMT: Also use the last page for
 bad block markers

On Tue, 22 Jan 2019 11:23:32 +0000
Schrempf Frieder <frieder.schrempf@...tron.de> wrote:

> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> It is known that some ESMT SLC NANDs have been shipped
> with the factory bad block markers in the first or last page
> of the block, instead of the first or second page. To be on
> the safe side, let's check all three locations.
> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>

Reviewed-by: Boris Brezillon <bbrezillon@...nel.org>

> ---
>  drivers/mtd/nand/raw/nand_esmt.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_esmt.c b/drivers/mtd/nand/raw/nand_esmt.c
> index 99a8092969a7..b37e0b5af5ae 100644
> --- a/drivers/mtd/nand/raw/nand_esmt.c
> +++ b/drivers/mtd/nand/raw/nand_esmt.c
> @@ -36,7 +36,14 @@ static void esmt_nand_decode_id(struct nand_chip *chip)
>  static int esmt_nand_init(struct nand_chip *chip)
>  {
>  	if (nand_is_slc(chip))
> -		chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
> +		/*
> +		 * It is known that some ESMT SLC NANDs have been shipped
> +		 * with the factory bad block markers in the first or last page
> +		 * of the block, instead of the first or second page. To be on
> +		 * the safe side, let's check all three locations.
> +		 */
> +		chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |
> +				 NAND_BBM_LASTPAGE;
>  
>  	return 0;
>  }