i.MX ProcessorsのトピックRe: cpufreq-set not working

cpufreq-set not working

kishan_dudhatra — Thu, 29 Jun 2023 13:27:55 GMT

Hi,

I am using imx8mm with Kirkstone (5.15.71). I am trying to set the CPU frequency but "/sys/devices/system/cpu/cpufreq" is empty. I also try to run cpufreq-info but getting below error:

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0: no or unknown cpufreq driver is active on this CPU analyzing CPU 1: no or unknown cpufreq driver is active on this CPU analyzing CPU 2: no or unknown cpufreq driver is active on this CPU analyzing CPU 3: no or unknown cpufreq driver is active on this CPU

Can you please suggest how to set CPU frequency from userspace?

Re: cpufreq-set not working

kishan_dudhatra — Mon, 03 Jul 2023 09:32:49 GMT

@ nxp team,

Could you please reply?

Re: cpufreq-set not working

Manuel_Salas — Mon, 03 Jul 2023 18:21:12 GMT

Hello @kishan_dudhatra!

Please refer to the attached document in the section 2.5.3 CPU Frequency Scaling (CPUFREQ), there is explained how to change the CPU frequency in user space.

I hope this can help to you.

Best regards.

Re: cpufreq-set not working

kishan_dudhatra — Thu, 13 Jul 2023 09:25:57 GMT

I refer to the documents but cpufreq is not available.

ls: cannot access '/sys/devices/system/cpu/cpu0/cpufreq': No such file or directory

My goal is to set the CPU frequency from userspace in Kirkstone and it's already worked in Zeus. I also try to enable it from driver side but did not succeed.
Can you please provide more information to enable the control to set the CPU frequency from userspace?

Re: cpufreq-set not working

himanshu_bhavani — Tue, 20 Feb 2024 07:25:23 GMT

Hi @kishan_dudhatra,

One of my colleague is able to resolve the issue.

This is a workaround patch, Please check this patch at your end.

This patch will resolve your issue!

Thanks & Regards,

Himanshu Bhavani

BSP Engineer at Silicon Signals Pvt Ltd | https://siliconsignals.io/

Re: cpufreq-set not working

pfiorini — Tue, 09 Apr 2024 06:43:48 GMT

@ nxp team

Same problem. Any Suggestion?

Regards.

Paolo Fiorini.