Re: [RFC PATCH v1 2/2] mtd: rawnand: meson: support for 512B ECC step size

Miquel Raynal
2023-07-04T08:36:55Z

Hi Arseniy,

AVKrasnov@sberdevices.ru wrote on Wed, 28 Jun 2023 12:29:36 +0300:

> Meson NAND supports both 512B and 1024B ECC step size.
>
> Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
> ---
> drivers/mtd/nand/raw/meson_nand.c | 47 +++++++++++++++++++++++--------
> 1 file changed, 35 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index 345212e8c691..6cc4f63b86c8 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -135,6 +135,7 @@ struct meson_nfc_nand_chip {
> struct meson_nand_ecc {
> u32 bch;
> u32 strength;
> + u32 size;
> };
>
> struct meson_nfc_data {
> @@ -190,7 +191,8 @@ struct meson_nfc {
> };
>
> enum {
> - NFC_ECC_BCH8_1K = 2,
> + NFC_ECC_BCH8_512 = 1,
> + NFC_ECC_BCH8_1K,
> NFC_ECC_BCH24_1K,
> NFC_ECC_BCH30_1K,
> NFC_ECC_BCH40_1K,
> @@ -198,15 +200,16 @@ enum {
> NFC_ECC_BCH60_1K,
> };
>
> -#define MESON_ECC_DATA(b, s) { .bch = (b), .strength = (s)}
> +#define MESON_ECC_DATA(b, s, sz) { .bch = (b), .strength = (s), .size = (sz) }
>
> static struct meson_nand_ecc meson_ecc[] = {
> - MESON_ECC_DATA(NFC_ECC_BCH8_1K, 8),
> - MESON_ECC_DATA(NFC_ECC_BCH24_1K, 24),
> - MESON_ECC_DATA(NFC_ECC_BCH30_1K, 30),
> - MESON_ECC_DATA(NFC_ECC_BCH40_1K, 40),
> - MESON_ECC_DATA(NFC_ECC_BCH50_1K, 50),
> - MESON_ECC_DATA(NFC_ECC_BCH60_1K, 60),
> + MESON_ECC_DATA(NFC_ECC_BCH8_512, 8, 512),
> + MESON_ECC_DATA(NFC_ECC_BCH8_1K, 8, 1024),
> + MESON_ECC_DATA(NFC_ECC_BCH24_1K, 24, 1024),
> + MESON_ECC_DATA(NFC_ECC_BCH30_1K, 30, 1024),
> + MESON_ECC_DATA(NFC_ECC_BCH40_1K, 40, 1024),
> + MESON_ECC_DATA(NFC_ECC_BCH50_1K, 50, 1024),
> + MESON_ECC_DATA(NFC_ECC_BCH60_1K, 60, 1024),
> };
>
> static int meson_nand_calc_ecc_bytes(int step_size, int strength)
> @@ -224,8 +227,27 @@ static int meson_nand_calc_ecc_bytes(int step_size, int strength)
>
> NAND_ECC_CAPS_SINGLE(meson_gxl_ecc_caps,
> meson_nand_calc_ecc_bytes, 1024, 8, 24, 30, 40, 50, 60);
> -NAND_ECC_CAPS_SINGLE(meson_axg_ecc_caps,
> - meson_nand_calc_ecc_bytes, 1024, 8);
> +
> +static const int axg_stepinfo_strengths[] = { 8 };
> +static const struct nand_ecc_step_info axg_stepinfo_1024 = {
> + .stepsize = 1024,
> + .strengths = axg_stepinfo_strengths,
> + .nstrengths = ARRAY_SIZE(axg_stepinfo_strengths)
> +};
> +
> +static const struct nand_ecc_step_info axg_stepinfo_512 = {
> + .stepsize = 512,
> + .strengths = axg_stepinfo_strengths,
> + .nstrengths = ARRAY_SIZE(axg_stepinfo_strengths)
> +};
> +
> +static const struct nand_ecc_step_info axg_stepinfo[] = { axg_stepinfo_1024, axg_stepinfo_512 };
> +
> +static const struct nand_ecc_caps meson_axg_ecc_caps = {
> + .stepinfos = axg_stepinfo,
> + .nstepinfos = ARRAY_SIZE(axg_stepinfo),
> + .calc_ecc_bytes = meson_nand_calc_ecc_bytes,
> +};
>
> static struct meson_nfc_nand_chip *to_meson_nand(struct nand_chip *nand)
> {
> @@ -1259,7 +1281,8 @@ static int meson_nand_bch_mode(struct nand_chip *nand)
> return -EINVAL;
>
> for (i = 0; i < ARRAY_SIZE(meson_ecc); i++) {
> - if (meson_ecc[i].strength == nand->ecc.strength) {
> + if (meson_ecc[i].strength == nand->ecc.strength &&
> + meson_ecc[i].size == nand->ecc.size) {
> meson_chip->bch_mode = meson_ecc[i].bch;
> return 0;
> }
> @@ -1278,7 +1301,7 @@ static int meson_nand_attach_chip(struct nand_chip *nand)
> struct meson_nfc *nfc = nand_get_controller_data(nand);
> struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
> struct mtd_info *mtd = nand_to_mtd(nand);
> - int nsectors = mtd->writesize / 1024;
> + int nsectors = mtd->writesize / 512;

This cannot be unconditional, right?

> int raw_writesize;
> int ret;
>

Thanks,
Miquèl