CPU Voltage Scaling

Robotics & Edge Computing Jetson & Embedded Systems Jetson TK1
1

Hi.

Is it possible to dynamically adjust the voltage (Vdd) of the quad-core CPU? I see that the following file can be edited to change the voltage offset employed during DVFS operations:

/sys/kernel/debug/clock/vdd_cpu_offs

However, changes to this file don’t seem to have any effect. Btw, I want to adjust voltage independent of the frequency (i.e. to under/over volt for a fixed frequency); therefore a tool like cpufreq-set doesn’t work in my case given that it changes voltage AND frequency in unison.

Thanks!

Best regards,
Augusto

2

Hi AugustoVega,

There is no CPU voltage scaling method, you could refer to Jetson/Performance - eLinux.org to maximize or minimize CPU & GPU clocks for different performance & power draw.

Cheers