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SubjectRe: [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@agner.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@agner.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

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