How to increase CPU frequency in IMX8QM-MEK

[vinothkumars]

Dear NXP,

I trying to increase CPU frequency for IMX8QM-MEK. I want to add this configuration in source. Will you please provide the exact steps to add and test CPU frequency.

Thanks & Regards,

Vinoth S,

[Zhiming_Liu]

Hi vinothkumars,

You can refer to this case and see the patch.

https://community.nxp.com/t5/i-MX-Processors/Lower-CPU-frequency-on-imx8mm/m-p/955456

The new dtsi CPU frequency node is like this:

a53_opp_table: opp-table {
compatible = "operating-points-v2";
opp-shared;

opp-1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt = <850000>;
opp-supported-hw = <0xe>, <0x7>;
clock-latency-ns = <150000>;
opp-suspend;
};

opp-1600000000 {
opp-hz = /bits/ 64 <1600000000>;
opp-microvolt = <900000>;
opp-supported-hw = <0xc>, <0x7>;
clock-latency-ns = <150000>;
opp-suspend;
};

opp-1800000000 {
opp-hz = /bits/ 64 <1800000000>;
opp-microvolt = <1000000>;
opp-supported-hw = <0x8>, <0x3>;
clock-latency-ns = <150000>;
opp-suspend;
};
};

Best Regards,

Zhiming

[vinothkumars]

Hi Zhiming,

Thank you for the quick reply.

# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

600000 800000 1000000 1200000

I have to set 1.2 GHZ as CPU0 frequency,

So, I able to set by

# echo 1200000 > sys/devices/system/cpu/cpu0/cpufre/scaling_setspeed

I have to verify this configuration give any effect or not in boot.

Thanks & Regards,

Vinoth S,

[udhayamoorthi]

@vinothkumars 

in my case i try to set 1200000

echo: write error: Invalid argument

how did you set it? 

[Zhiming_Liu]

Hi,

cpufreq-info can help you check your CPU frequency.

If you use that commands in linux shell, when you restart your board ,the CPU frequency will become default.You can add the commad into init.rc so that you can increase your frequency in usr layer when you start your board next time.

[vinothkumars]

nxf65025 ,

Thank you for the reply

cpufreq-info - unable to execute this command. I am working in Android.

Will you please provide some patch to add in init.rc

Thanks & Regards,

Vinoth S,