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i.MX6 CPUFREQ driver vs thermal driver.

Question asked by Satoshi Shimoda on Sep 7, 2015
Latest reply on Sep 7, 2015 by igorpadykov

Hi community,

 

I have a question about i.MX6 CPU frequency scaling and thermal control.

I know the CPU frequency is held to max frequency by the following command with L3.10.17_1.0.0-ga by CPUFREQ driver.

 

echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

 

And I know the CPU frequency is set to lower when the CPU temperature is over "passive point" for cooling by thermal driver also.

Then, which has a priority?

If scaling_governor is set to performance with the above command and CPU temperature is over "passive point", CPU frequency is kept to max frequency by CPUFREQ driver? or set to lower frequency by thermal driver?

 

 

Best Regards,

Satoshi Shimoda

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