From: Michael Lawnick <ml.lawnick-Mmb7MZpHnFY@public.gmane.org>
To: Jason Hui <jason.hui-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: About one i2c failure issue after system reset
Date: Mon, 21 Nov 2011 12:49:09 +0100 [thread overview]
Message-ID: <4ECA3AB5.8060103@gmx.de> (raw)
In-Reply-To: <CAFQ4atSRapXvhBnm=nH__zz2U=XRjxN4GK-JsXT=AEcKybANZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Am 21.11.2011 08:35, schrieb Jason Hui:
> Hi, Ben, Jean,
>
> I have one issue about the i2c failure: there will be on-going i2c
> transfer while system get reset.
> At the time when the reset happens, the slave may pull the SDA to
> LOW.After reset, the i2c master may reset, but
> the slave may still pull the SDA to LOW since there is no reset pin
> for the slave device to do i2c reset, thus
> result in the further i2c access failure forever unless we completely
> power off the system by pulling out
> the battery.
>
This is a common failure scenario and should be solved by your adapter
driver automatically by issuing 9 clock cycles on detection.
--
KR
Michael
prev parent reply other threads:[~2011-11-21 11:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 7:35 About one i2c failure issue after system reset Jason Hui
[not found] ` <CAFQ4atSRapXvhBnm=nH__zz2U=XRjxN4GK-JsXT=AEcKybANZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-11-21 10:19 ` Rajeev kumar
2011-11-21 11:49 ` Michael Lawnick [this message]
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