From: "Álvaro Fernández Rojas" <noltari@gmail.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: vigneshr@ti.com, kdasu.kdev@gmail.com, richard@nod.at,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, linux-mtd@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com,
computersforpeace@gmail.com, linux-media@vger.kernel.org
Subject: Re: [PATCH v3 2/2] mtd: rawnand: brcmnand: improve hamming oob layout
Date: Tue, 12 May 2020 09:12:10 +0200 [thread overview]
Message-ID: <5377BB9D-35EB-4531-8E03-A7483D3134E4@gmail.com> (raw)
In-Reply-To: <20200512090844.21bcaf22@xps13>
Hi Miquel,
I also had a hard time understanding your email.
It was quite misleading.
> El 12 may 2020, a las 9:08, Miquel Raynal <miquel.raynal@bootlin.com> escribió:
>
> Hi Álvaro,
>
> Álvaro Fernández Rojas <noltari@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.
Do I need to resend this again?
Looks like no matter what I do it’s always wrong...
>
>> Signed-off-by: Álvaro Fernández Rojas <noltari@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?
In this case next will be 6 (which is the first ECC byte).
However, for small page NANDs byte 5 is reserved for BBT, so we want next to be 5 only in this case.
>
>> }
>> }
>>
>> + oobregion->length = next - oobregion->offset;
>> +
>> return 0;
>> }
>>
>
>
> Thanks,
> Miquèl
Regards,
Álvaro.
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next prev parent reply other threads:[~2020-05-13 9:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-04 9:30 [PATCH 1/2] nand: brcmnand: improve hamming oob layout Álvaro Fernández Rojas
2020-05-04 9:30 ` [PATCH 2/2] nand: brcmnand: fix BBI in " Álvaro Fernández Rojas
2020-05-04 18:59 ` [PATCH v2 1/2] nand: brcmnand: improve " Álvaro Fernández Rojas
2020-05-04 18:59 ` [PATCH v2 2/2] nand: brcmnand: fix " Álvaro Fernández Rojas
2020-05-12 6:00 ` [PATCH v3 0/2] mtd: rawnand: brcmnand: improve " Álvaro Fernández Rojas
2020-05-12 6:00 ` [PATCH v3 1/2] mtd: rawnand: brcmnand: fix " Álvaro Fernández Rojas
2020-05-12 6:00 ` [PATCH v3 2/2] mtd: rawnand: brcmnand: improve " Álvaro Fernández Rojas
2020-05-12 7:08 ` Miquel Raynal
2020-05-12 7:12 ` Álvaro Fernández Rojas [this message]
2020-05-12 7:19 ` Miquel Raynal
2020-05-12 7:26 ` Álvaro Fernández Rojas
2020-05-12 7:41 ` Miquel Raynal
2020-05-12 7:57 ` [PATCH v4 0/2] " Álvaro Fernández Rojas
2020-05-12 7:57 ` [PATCH v4 1/2] mtd: rawnand: brcmnand: fix " Álvaro Fernández Rojas
2020-05-24 19:17 ` Miquel Raynal
2020-05-12 7:57 ` [PATCH v4 2/2] mtd: rawnand: brcmnand: improve " Álvaro Fernández Rojas
2020-05-24 19:17 ` Miquel Raynal
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