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Date:   Wed, 17 Apr 2019 12:08:05 +0200
From:   Miquel Raynal <miquel.raynal@bootlin.com>
To:     Schrempf Frieder <frieder.schrempf@kontron.de>
Cc:     "bbrezillon@kernel.org" <bbrezillon@kernel.org>,
        "richard@nod.at" <richard@nod.at>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Marek Vasut <marek.vasut@gmail.com>
Subject: Re: [PATCH v4 6/7] mtd: rawnand: ESMT: Also use the last page for
 bad block markers
Message-ID: <20190417120805.6727d78f@xps13>
In-Reply-To: <20190218104122.18788-7-frieder.schrempf@kontron.de>
References: <20190218104122.18788-1-frieder.schrempf@kontron.de>
        <20190218104122.18788-7-frieder.schrempf@kontron.de>
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Hi Frieder,

Schrempf Frieder <frieder.schrempf@kontron.de> wrote on Mon, 18 Feb
2019 10:42:45 +0000:

> From: Frieder Schrempf <frieder.schrempf@kontron.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@kontron.de>
> Reviewed-by: Boris Brezillon <bbrezillon@kernel.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;
>  }


Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>


Thanks,
Miquèl