RX51: kernel message spam from CPUfreq driver

RX51: kernel message spam from CPUfreq driver

[Sebastian Reichel]

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Hi,

On RX-51 (Nokia N900) the (mainline) kernel constantly outputs the
following message about 2-3x per second since some releases:

[ 1038.314514] cpu cpu0: CPUfreq: Cannot find matching frequency for 125000000

(The message is from drivers/cpufreq/omap-cpufreq.c, line 100)

This is really annoying and makes debug output without a "grep -v"
basically useless. Can you give me some hints how to solve the
problem?

-- Sebastian

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Re: RX51: kernel message spam from CPUfreq driver

[Rajendra Nayak]

On Sunday 11 August 2013 07:43 PM, Sebastian Reichel wrote:
> Hi,
> 
> On RX-51 (Nokia N900) the (mainline) kernel constantly outputs the
> following message about 2-3x per second since some releases:
> 
> [ 1038.314514] cpu cpu0: CPUfreq: Cannot find matching frequency for 125000000
> 
> (The message is from drivers/cpufreq/omap-cpufreq.c, line 100)
> 
> This is really annoying and makes debug output without a "grep -v"
> basically useless. Can you give me some hints how to solve the
> problem?

Whats the system clock frequency used on RX-51? I guess omap2_dpll_round_rate()
for some reason thinks that with the given sys clock its not possible to
lock the DPLL at 125Mhz. If you can send the debug logs from omap2_dpll_round_rate()
that should probably help know whats going wrong.

> 
> -- Sebastian
> 

Re: RX51: kernel message spam from CPUfreq driver

[Sebastian Reichel]

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Hi,

On Mon, Aug 12, 2013 at 11:59:28AM +0530, Rajendra Nayak wrote:
> Whats the system clock frequency used on RX-51? I guess omap2_dpll_round_rate()
> for some reason thinks that with the given sys clock its not possible to
> lock the DPLL at 125Mhz. If you can send the debug logs from omap2_dpll_round_rate()
> that should probably help know whats going wrong.

It's also not possible to lock the DPLL at other frequencies. During
the boot process at least 125MHz, 250MHz and 550MHz cannot be locked.

I uploaded a full serial dump from the n900 with debug output from 
omap2_dpll_round_rate to the following url:

http://paste.debian.net/24628/

-- Sebastian

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