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Date: Wed, 18 Jul 2018 20:32:49 +0200
From: Boris Brezillon <boris.brezillon@bootlin.com>
To: Boris Brezillon <boris.brezillon@bootlin.com>, Richard Weinberger
 <richard@nod.at>, Miquel Raynal <miquel.raynal@bootlin.com>,
 linux-mtd@lists.infradead.org
Cc: David Woodhouse <dwmw2@infradead.org>, Brian Norris
 <computersforpeace@gmail.com>, Marek Vasut <marek.vasut@gmail.com>, Chris
 Packham <chris.packham@alliedtelesis.co.nz>
Subject: Re: [PATCH 4/7] mtd: rawnand: micron: allow forced on-die ECC
Message-ID: <20180718203249.5146d069@bbrezillon>
In-Reply-To: <20180718084221.27821-4-boris.brezillon@bootlin.com>
References: <20180718084221.27821-1-boris.brezillon@bootlin.com>
 <20180718084221.27821-4-boris.brezillon@bootlin.com>
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On Wed, 18 Jul 2018 10:42:18 +0200
Boris Brezillon <boris.brezillon@bootlin.com> wrote:

> From: Chris Packham <chris.packham@alliedtelesis.co.nz>
> 
> Some Micron NAND chips have on-die ECC forceably enabled. Allow such
> chips to be used as long as the controller has set chip->ecc.mode to
> NAND_ECC_ON_DIE.
> 
> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
> Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Missing

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>

> ---
>  drivers/mtd/nand/raw/nand_micron.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c
> index f8839c7f7464..fd3f68e0909f 100644
> --- a/drivers/mtd/nand/raw/nand_micron.c
> +++ b/drivers/mtd/nand/raw/nand_micron.c
> @@ -374,7 +374,8 @@ static int micron_nand_init(struct nand_chip *chip)
>  
>  	ondie = micron_supports_on_die_ecc(chip);
>  
> -	if (ondie == MICRON_ON_DIE_MANDATORY) {
> +	if (ondie == MICRON_ON_DIE_MANDATORY &&
> +	    chip->ecc.mode != NAND_ECC_ON_DIE) {
>  		pr_err("On-die ECC forcefully enabled, not supported\n");
>  		return -EINVAL;
>  	}
> @@ -398,8 +399,14 @@ static int micron_nand_init(struct nand_chip *chip)
>  		chip->ecc.algo = NAND_ECC_BCH;
>  		chip->ecc.read_page = micron_nand_read_page_on_die_ecc;
>  		chip->ecc.write_page = micron_nand_write_page_on_die_ecc;
> -		chip->ecc.read_page_raw = nand_read_page_raw;
> -		chip->ecc.write_page_raw = nand_write_page_raw;
> +
> +		if (ondie == MICRON_ON_DIE_MANDATORY) {
> +			chip->ecc.read_page_raw = nand_read_page_raw_notsupp;
> +			chip->ecc.write_page_raw = nand_write_page_raw_notsupp;
> +		} else {
> +			chip->ecc.read_page_raw = nand_read_page_raw;
> +			chip->ecc.write_page_raw = nand_write_page_raw;
> +		}
>  	}
>  
>  	return 0;