Hi Álvaro,
Álvaro Fernández Rojas <nolt...@gmail.com> wrote on Tue, 12 May 2020
08:00:23 +0200:
> The current code generates 8 oob sections:
> S1 1-5
> ECC 6-8
> S2 9-15
> S3 16-21
> ECC 22-24
> S4 25-31
> S5 32-37
> ECC 38-40
> S6 41-47
> S7 48-53
> ECC 54-56
> S8 57-63
>
> Change it by merging continuous sections:
> S1 1-5
> ECC 6-8
> S2 9-21
> ECC 22-24
> S3 25-37
> ECC 38-40
> S4 41-53
> ECC 54-56
> S5 57-63
>
> Fixes: ef5eeea6e911 ("mtd: nand: brcm: switch to mtd_ooblayout_ops")
Sorry for leading you the wrong way, actually this patch does not
deserve a Fixes tag.
> Signed-off-by: Álvaro Fernández Rojas <nolt...@gmail.com>
> ---
> v3: invert patch order
> v2: keep original comment and fix correctly skip byte 6 for small-page nand
>
> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 37 ++++++++++++------------
> 1 file changed, 18 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 1c1070111ebc..0a1d76fde37b 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -1100,33 +1100,32 @@ static int brcmnand_hamming_ooblayout_free(struct
> mtd_info *mtd, int section,
> struct brcmnand_cfg *cfg = &host->hwcfg;
> int sas = cfg->spare_area_size << cfg->sector_size_1k;
> int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
> + u32 next;
>
> - if (section >= sectors * 2)
> + if (section > sectors)
> return -ERANGE;
>
> - oobregion->offset = (section / 2) * sas;
> + next = (section * sas);
> + if (section < sectors)
> + next += 6;
>
> - if (section & 1) {
> - oobregion->offset += 9;
> - oobregion->length = 7;
> + if (section) {
> + oobregion->offset = ((section - 1) * sas) + 9;
> } else {
> - oobregion->length = 6;
> -
> - /* First sector of each page may have BBI */
> - if (!section) {
> - /*
> - * Small-page NAND use byte 6 for BBI while large-page
> - * NAND use bytes 0 and 1.
> - */
> - if (cfg->page_size > 512) {
> - oobregion->offset += 2;
> - oobregion->length -= 2;
> - } else {
> - oobregion->length--;
> - }
> + /*
> + * Small-page NAND use byte 6 for BBI while large-page
> + * NAND use bytes 0 and 1.
> + */
> + if (cfg->page_size > 512) {
> + oobregion->offset = 2;
> + } else {
> + oobregion->offset = 0;
> + next--;
This next-- seems very strange, can you explain?
> }
> }
>
> + oobregion->length = next - oobregion->offset;
> +
> return 0;
> }
>
Thanks,
Miquèl
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