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

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Date:   Thu, 12 Apr 2018 08:56:45 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Boris Brezillon <boris.brezillon@...tlin.com>, 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

Han,

On 15.03.2018 16:39, Stefan Agner wrote:
> On March 15, 2018 4:36:20 PM GMT+01:00, Boris Brezillon
> <boris.brezillon@...tlin.com> wrote:
>>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.

Any comment on this?

U-Boot support for device tree support and the same properties is
underway.

--
Stefan


>>
>>Stephan, there's no changelog. Has anything changed in this version or
>>is this just a RESEND?
> 
> Sorry forgot that. I just split documentation and driver changes.
> 
> --
> Stefan
> 
>>
>>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;
>>>  }