From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "Álvaro Fernández Rojas" <noltari@gmail.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 09:19:58 +0200 [thread overview]
Message-ID: <20200512091958.0d153319@xps13> (raw)
In-Reply-To: <5377BB9D-35EB-4531-8E03-A7483D3134E4@gmail.com>
Hi Álvaro,
Álvaro Fernández Rojas <noltari@gmail.com> wrote on Tue, 12 May 2020
09:12:10 +0200:
> 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...
Please don't give up! It is normal to work back and forth with the
community. I need the patch to be clear and bug-free so I ask you to
make changes and ask questions, that's how it works. But all your
patches are enhancing this driver so please keep posting!
>
> >
> >> 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.
That's clear, please add a comment there then.
>
> >
> >> }
> >> }
> >>
> >> + oobregion->length = next - oobregion->offset;
> >> +
> >> return 0;
> >> }
> >>
> >
> >
> > Thanks,
> > Miquèl
>
> Regards,
> Álvaro.
Thanks,
Miquèl
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-05-13 9:10 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
2020-05-12 7:19 ` Miquel Raynal [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200512091958.0d153319@xps13 \
--to=miquel.raynal@bootlin.com \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=computersforpeace@gmail.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=kdasu.kdev@gmail.com \
--cc=linaro-mm-sig@lists.linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=noltari@gmail.com \
--cc=richard@nod.at \
--cc=vigneshr@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).