linux-kernel - Re: [PATCH v2 1/2] mtd: rawnand: gpmi: add support for specific ECC strength

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Date:   Fri, 13 Apr 2018 21:57:24 +0000
From:   Han Xu <han.xu@....com>
To:     Stefan Agner <stefan@...er.ch>,
        "boris.brezillon@...e-electrons.com" 
        <boris.brezillon@...e-electrons.com>
CC:     "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "richard@....at" <richard@....at>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "cyrille.pitchen@...ev4u.fr" <cyrille.pitchen@...ev4u.fr>,
        "max.oss.09@...il.com" <max.oss.09@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] mtd: rawnand: gpmi: add support for specific ECC
 strength



On 03/04/2018 02:06 PM, Stefan Agner wrote:
> Add support for specified ECC strength/size using device tree
> properties nand-ecc-strength/nand-ecc-step-size.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>   drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 30 ++++++++++++++++++++----------
>   1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 61fdd733492f..d04754289c03 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -198,17 +198,16 @@ static inline bool gpmi_check_ecc(struct gpmi_nand_data *this)
>    *
>    * We may have available oob space in this case.
>    */
> -static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
> +static int set_geometry_by_ecc_info(struct gpmi_nand_data *this,
> +				    unsigned int ecc_strength,
> +				    unsigned int ecc_step)
>   {
>   	struct bch_geometry *geo = &this->bch_geometry;
>   	struct nand_chip *chip = &this->nand;
>   	struct mtd_info *mtd = nand_to_mtd(chip);
>   	unsigned int block_mark_bit_offset;
>   
> -	if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
> -		return -EINVAL;
> -
> -	switch (chip->ecc_step_ds) {
> +	switch (ecc_step) {
>   	case SZ_512:
>   		geo->gf_len = 13;
>   		break;
> @@ -221,8 +220,8 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
>   			chip->ecc_strength_ds, chip->ecc_step_ds);
>   		return -EINVAL;
>   	}
> -	geo->ecc_chunk_size = chip->ecc_step_ds;
> -	geo->ecc_strength = round_up(chip->ecc_strength_ds, 2);
> +	geo->ecc_chunk_size = ecc_step;
> +	geo->ecc_strength = round_up(ecc_strength, 2);
>   	if (!gpmi_check_ecc(this))
>   		return -EINVAL;
>   
> @@ -230,7 +229,7 @@ static int set_geometry_by_ecc_info(struct gpmi_nand_data *this)
>   	if (geo->ecc_chunk_size < mtd->oobsize) {
>   		dev_err(this->dev,
>   			"unsupported nand chip. ecc size: %d, oob size : %d\n",
> -			chip->ecc_step_ds, mtd->oobsize);
> +			ecc_step, mtd->oobsize);
>   		return -EINVAL;
>   	}
>   
> @@ -423,9 +422,20 @@ static int legacy_set_geometry(struct gpmi_nand_data *this)
>   
>   int common_nfc_set_geometry(struct gpmi_nand_data *this)
>   {
> +	struct nand_chip *chip = &this->nand;
> +
> +	if (chip->ecc.strength > 0 && chip->ecc.size > 0)
> +		return set_geometry_by_ecc_info(this, chip->ecc.strength,
> +						chip->ecc.size);
> +
>   	if ((of_property_read_bool(this->dev->of_node, "fsl,use-minimum-ecc"))
> -				|| legacy_set_geometry(this))
> -		return set_geometry_by_ecc_info(this);
> +				|| legacy_set_geometry(this)) {
> +		if (!(chip->ecc_strength_ds > 0 && chip->ecc_step_ds > 0))
> +			return -EINVAL;
> +
> +		return set_geometry_by_ecc_info(this, chip->ecc_strength_ds,
> +						chip->ecc_step_ds);
> +	}
>   
>   	return 0;
>   }
> 

Acked-by: Han Xu <han.xu@....com>