Linux/DRA71: config MPU clock frequency

Widic Jane

Part Number: DRA71
Other Parts Discussed in Thread: DRA72

Tool/software: Linux

I get the J6entry evm, and actually I use 712. So I want to config the GPU and MPU clock fredyqency.

use below command to config and no effect, could you give me some suggestions.

Select userspace governor
echo -n "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
When using "userspace" governor to change to a low/high power state/OPP, first check the available frequencies:
$cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
Select a frequency and to change current cpu frequency, execute the following:

$echo -n "<new_frequency> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

over 6 years ago

0 Widic Jane over 6 years ago

Expert 1800 points

$echo -n "<600000> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed”
anything about this?

0 Widic Jane over 6 years ago in reply to Widic Jane

Expert 1800 points

I checked the J6entry only has cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1000000.
Could you guide me to config the 800000 and 600000?

0 Yordan Kamenov over 6 years ago in reply to Widic Jane

TI__Mastermind 42515 points

Hi Widic,

can you try this:
processors.wiki.ti.com/.../Processor_SDK_Linux_Automotive_FAQ

Regards,
Yordan

0 Widic Jane over 6 years ago in reply to Yordan Kamenov

Expert 1800 points

Hi,yordan,
I test about this, It doesnot work,

I added it in arch/arm/boot/dts/dra72x.dtsi:

#include "dra7.dtsi"

/ {
compatible = "ti,dra722", "ti,dra72", "ti,dra7";

cpus {
#address-cells = <1>;
#size-cells = <0>;

cpu0: cpu@0 {
device_type = "cpu";
compatible = "arm,cortex-a15";
reg = <0>;
operating-points = <
/* kHz uV */
600000 1100000
800000 1100000
>;
/* cooling options */
cooling-min-level = <0>;
cooling-max-level = <2>;
#cooling-cells = <2>; /* min followed by max */
};
};

recompile kernel,
it still only has 100000
root@dra7xx-evm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1000000

Please help to check the isssue.

0 Widic Jane over 6 years ago in reply to Widic Jane

Expert 1800 points

I use psdk0304 and kernel is v4.4

0 Widic Jane over 6 years ago in reply to Widic Jane

Expert 1800 points

I set in kernel dtb. and solved this

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Linux/DRA71: config MPU clock frequency