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

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Date:   Tue, 22 Jan 2019 17:28:42 +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 4/4] mtd: rawnand: AMD: Also use the last page for
 bad block markers

On Tue, 22 Jan 2019 11:23:33 +0000
Schrempf Frieder <frieder.schrempf@...tron.de> wrote:

> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> According to the datasheet of some Cypress SLC NANDs, the bad
> block markers can be in the first, second or last page of a block.
> So 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_amd.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_amd.c b/drivers/mtd/nand/raw/nand_amd.c
> index 6202cbf7ee8d..2ffcddff3e27 100644
> --- a/drivers/mtd/nand/raw/nand_amd.c
> +++ b/drivers/mtd/nand/raw/nand_amd.c
> @@ -40,7 +40,13 @@ static void amd_nand_decode_id(struct nand_chip *chip)
>  static int amd_nand_init(struct nand_chip *chip)
>  {
>  	if (nand_is_slc(chip))
> -		chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
> +		/*
> +		 * According to the datasheet of some Cypress SLC NANDs,
> +		 * the bad block markers can be in the first, second or last
> +		 * page of a block. So let's check all three locations.
> +		 */
> +		chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |
> +				 NAND_BBM_LASTPAGE;
>  
>  	return 0;
>  }