From: Dominik Brodowski <linux@brodo.de>
To: Stefan Buettcher <stefan@buettcher.org>
Cc: cpufreq ML <cpufreq@www.linux.org.uk>
Subject: Re: calling cpufreq_set
Date: Wed, 5 Nov 2003 15:29:13 +0100 [thread overview]
Message-ID: <20031105142913.GA19764@brodo.de> (raw)
In-Reply-To: <3FA839CD.3070404@buettcher.org>
Hi Stefan,
On Wed, Nov 05, 2003 at 12:44:13AM +0100, Stefan Buettcher wrote:
> Hi,
>
> I am new to this list as well as cpufreq at all.
>
> I have written a kernel module (2.4.19-something) on the
> ipaq 5400. This module makes direct calls to cpufreq_set.
> While the system does not break, the usb does. usbnet
> suddenly stops working and will resist my efforts to work
> afterwards.
>
> When I do not do the calls from within the kernel but use
> the proc file interface provided by cpufreq, the system is
> stable and usb has no problems.
>
> Has anyone experienced similar problems? Any idea why
> this happens?
I'm not aware of the details of the ipaq cpufreq driver - it's neither in
the kernel sources, nor was it ever posted on this list... so it _might_ be
a driver- or platform-specific problem. Maybe some timing calculations are
wrong after calls to cpufreq_set, maybe there needs to be some delay between
subsequent calls to cpufreq_set, ...
Other than that, cpufreq_set() is deprecated in 2.6.
Dominik
prev parent reply other threads:[~2003-11-05 14:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-04 23:44 calling cpufreq_set Stefan Buettcher
2003-11-05 14:29 ` Dominik Brodowski [this message]
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