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

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Date:   Thu, 15 Mar 2018 16:36:20 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Stefan Agner <stefan@...er.ch>, han.xu@....com
Cc:     boris.brezillon@...e-electrons.com, max.oss.09@...il.com,
        richard@....at, linux-kernel@...r.kernel.org,
        marek.vasut@...il.com, linux-mtd@...ts.infradead.org,
        cyrille.pitchen@...ev4u.fr, dwmw2@...radead.org
Subject: Re: [PATCH v2 1/2] mtd: rawnand: gpmi: add support for specific ECC
 strength

Hi,

On Sun,  4 Mar 2018 21:06:01 +0100
Stefan Agner <stefan@...er.ch> wrote:

> Add support for specified ECC strength/size using device tree
> properties nand-ecc-strength/nand-ecc-step-size.

Han, we didn't hear back from you on that. Are you okay with adding
these new properties? IIRC, you feared there would be a delta between
u-boot and linux support.

Stephan, there's no changelog. Has anything changed in this version or
is this just a RESEND?

Regards,

Boris

> 
> 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;
>  }



-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com