From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Jean Delvare <khali@linux-fr.org>
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
Tim Shepard <shep@alum.mit.edu>
Subject: Re: i2c-powermac fails
Date: Tue, 13 Oct 2009 20:32:28 +1100 [thread overview]
Message-ID: <1255426348.2192.187.camel@pasglop> (raw)
In-Reply-To: <20091013112304.74083fd1@hyperion.delvare>
On Tue, 2009-10-13 at 11:23 +0200, Jean Delvare wrote:
> Hi Ben, Paul,
>
> I had a report by Tim Shepard (Cc'd) that the therm_adt746x driver
> sometimes fails to initialize on his PowerBook G4 running kernel
> 2.6.31. The following error message can be seen in the logs when the
> failure happens:
>
> therm_adt746x 7-002e: Thermostat failed to read config!
>
> After enabling low-level i2c debugging, it turns out that the problem
> is caused by low-level errors at the I2C bus level:
Nothing comes to mind immediately, but I'll have another look tomorrow.
Maybe we are configuring the i2c bus too fast ? Another possibility
would be that the device needs some retries ...
Ben.
next prev parent reply other threads:[~2009-10-13 9:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-13 9:23 i2c-powermac fails Jean Delvare
2009-10-13 9:32 ` Benjamin Herrenschmidt [this message]
2009-10-13 9:49 ` Jean Delvare
2009-10-14 21:02 ` Jean Delvare
2009-10-14 21:26 ` Benjamin Herrenschmidt
2009-10-15 10:49 ` Jean Delvare
2009-10-15 11:19 ` Benjamin Herrenschmidt
2009-10-15 14:05 ` Jean Delvare
2009-10-16 7:44 ` Jean Delvare
2009-10-16 8:42 ` Benjamin Herrenschmidt
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