From: Liang Yang <liang.yang@amlogic.com>
To: Boris Brezillon <boris.brezillon@bootlin.com>
Cc: Rob Herring <robh@kernel.org>,
Hanjie Lin <hanjie.lin@amlogic.com>,
Victor Wan <victor.wan@amlogic.com>,
Jianxin Pan <jianxin.pan@amlogic.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Richard Weinberger <richard@nod.at>,
Yixun Lan <yixun.lan@amlogic.com>,
linux-kernel@vger.kernel.org, Marek Vasut <marek.vasut@gmail.com>,
Jian Hu <jian.hu@amlogic.com>,
linux-mtd@lists.infradead.org,
Kevin Hilman <khilman@baylibre.com>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Carlo Caione <carlo@caione.org>,
linux-amlogic@lists.infradead.org,
Brian Norris <computersforpeace@gmail.com>,
David Woodhouse <dwmw2@infradead.org>,
linux-arm-kernel@lists.infradead.org,
Jerome Brunet <jbrunet@baylibre.com>
Subject: Re: [PATCH v7 2/2] mtd: rawnand: meson: add support for Amlogic NAND flash controller
Date: Mon, 10 Dec 2018 20:12:39 +0800 [thread overview]
Message-ID: <79a797c2-f37f-7f7c-e907-2d3c2283ec2d@amlogic.com> (raw)
In-Reply-To: <20181210123809.5ade45c4@bbrezillon>
On 2018/12/10 19:38, Boris Brezillon wrote:
> On Mon, 10 Dec 2018 19:23:46 +0800
> Liang Yang <liang.yang@amlogic.com> wrote:
>
>>>> + mtd->ecc_stats.failed++;
>>>> + continue;
>>>> + }
>>>> + mtd->ecc_stats.corrected += ECC_ERR_CNT(*info);
>>>> + bitflips = max_t(u32, bitflips, ECC_ERR_CNT(*info));
>>>> + }
>>>
>>> Are you sure you handle correctly empty pages with bf?
>>>
>> if scramble is enable, i would say yes here.
>> when scramble is disabled, i am considering how to use the helper
>> nand_check_erased_ecc_chunk, but it seems that i can't get the ecc
>> bytes which is caculated by ecc engine.by the way, nfc dma doesn't send
>> out the ecc parity bytes.
>
> Even if the ECC engine is disabled?
>
No.
When ECC engine is disabled, it can read the ecc parity bytes ; but
there is another problem that i need to consider how code struct looks
better when reading error with ecc opened and then try to raw read.
Is there a good idea?
>> so i would suggest using scramble.
>>
>
> No, please don't force people to use the scrambler.
>
>>>> +
>>>> +const void *
>>>> +meson_nand_op_get_dma_safe_output_buf(const struct nand_op_instr *instr)
>>>> +{
>>>> + if (WARN_ON(instr->type != NAND_OP_DATA_OUT_INSTR))
>>>> + return NULL;
>>>> +
>>>> + if (virt_addr_valid(instr->ctx.data.buf.out) &&
>>>> + !object_is_on_stack(instr->ctx.data.buf.out))
>>>
>>> Can you please create helpers for that? I guess it will help removing
>>> these checks once the core will have a DMA-safe approach.
>>>
>> I will use below definition:
>> #define BUFFER_IS_DMA_SAFE(x) \
>> (virt_addr_valid((x)) && (!object_is_on_stack((x))))
>>
>> Is it ok?
>
> Please define a function, not a macro.
> ok
> .
>
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
next prev parent reply other threads:[~2018-12-10 12:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 16:40 [PATCH v7 0/2] mtd: rawnand: meson: add Amlogic NAND driver support Jianxin Pan
2018-11-16 16:40 ` [PATCH v7 1/2] dt-bindings: nand: meson: add Amlogic NAND controller driver Jianxin Pan
2018-11-16 16:40 ` [PATCH v7 2/2] mtd: rawnand: meson: add support for Amlogic NAND flash controller Jianxin Pan
2018-12-07 9:24 ` Miquel Raynal
2018-12-07 9:42 ` Miquel Raynal
2018-12-07 10:41 ` Liang Yang
2018-12-07 10:48 ` Miquel Raynal
2018-12-10 11:23 ` Liang Yang
2018-12-10 11:38 ` Boris Brezillon
2018-12-10 12:12 ` Liang Yang [this message]
2018-12-10 14:50 ` Miquel Raynal
2018-12-11 1:56 ` Liang Yang
2018-12-11 7:54 ` Miquel Raynal
2018-12-11 8:36 ` Liang Yang
2018-12-11 9:07 ` Miquel Raynal
2018-12-11 9:43 ` Liang Yang
2018-12-11 8:39 ` Boris Brezillon
2018-12-11 9:39 ` Liang Yang
2018-11-26 6:39 ` [PATCH v7 0/2] mtd: rawnand: meson: add Amlogic NAND driver support Liang Yang
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=79a797c2-f37f-7f7c-e907-2d3c2283ec2d@amlogic.com \
--to=liang.yang@amlogic.com \
--cc=boris.brezillon@bootlin.com \
--cc=carlo@caione.org \
--cc=computersforpeace@gmail.com \
--cc=dwmw2@infradead.org \
--cc=hanjie.lin@amlogic.com \
--cc=jbrunet@baylibre.com \
--cc=jian.hu@amlogic.com \
--cc=jianxin.pan@amlogic.com \
--cc=khilman@baylibre.com \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=marek.vasut@gmail.com \
--cc=martin.blumenstingl@googlemail.com \
--cc=miquel.raynal@bootlin.com \
--cc=narmstrong@baylibre.com \
--cc=richard@nod.at \
--cc=robh@kernel.org \
--cc=victor.wan@amlogic.com \
--cc=yixun.lan@amlogic.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).