From: Matthieu CASTET <matthieu.castet@parrot.com>
To: Huang Shijie <b32955@freescale.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
Artem Bityutskiy <dedekind1@gmail.com>
Subject: Re: question: Why the nand_wait() wait for 20ms for nand program.
Date: Mon, 21 Jan 2013 09:57:14 +0100 [thread overview]
Message-ID: <50FD02EA.5050209@parrot.com> (raw)
In-Reply-To: <50FCB75D.1000200@freescale.com>
Huang Shijie a écrit :
> 于 2013年01月18日 20:26, Matthieu CASTET 写道:
>> Huang Shijie a écrit :
>>> Hi all:
>>> Why the nand_wait() wait for 20ms for nand program. could we
>>> expand this time to 40ms? I have a nand chip : Micron MT29F64G08CBABAWP.
>>> The chip's BUSY/READY pin may needs more then 20ms to become ready,
>>> though its
>>> datasheet tells me the tPROG's max value is 2.5ms.
>>>
>> Don't you have an hardware problem (missing pullup/down on ready busy pin) ?
>>
>> If the datasheet say the max value is 2.5 ms , how it can be more than 20 ms.
>
> I finally found the root cause.
>
> I added the do_gettimeofday() in the nand_wait() to measure the
> READY/BUSY time. The code is like this:
> ---------------------------------------------------- code start
>
Could you dump jiffies and timeo in your code ?
next prev parent reply other threads:[~2013-01-21 8:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-18 8:05 question: Why the nand_wait() wait for 20ms for nand program Huang Shijie
2013-01-18 12:26 ` Matthieu CASTET
2013-01-21 3:34 ` Huang Shijie
2013-01-21 8:57 ` Matthieu CASTET [this message]
[not found] ` <50FD0554.8030108@freescale.com>
2013-01-21 9:15 ` Matthieu CASTET
2013-01-21 9:25 ` Huang Shijie
2013-01-21 9:32 ` Matthieu CASTET
2013-01-21 9:35 ` Huang Shijie
[not found] ` <50FF9068.1030709@freescale.com>
2013-02-01 16:58 ` question about mtd_torturetest.c Artem Bityutskiy
2013-02-04 5:19 ` Gupta, Pekon
2013-02-04 6:58 ` Artem Bityutskiy
2013-02-04 7:32 ` Huang Shijie
2013-01-22 2:46 ` question: Why the nand_wait() wait for 20ms for nand program Huang Shijie
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=50FD02EA.5050209@parrot.com \
--to=matthieu.castet@parrot.com \
--cc=b32955@freescale.com \
--cc=dedekind1@gmail.com \
--cc=dwmw2@infradead.org \
--cc=linux-mtd@lists.infradead.org \
/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