We develop a Video Processing system based on SD820 SOM from a third party. We are trying to implement a power saving mode where we reduce the frame rate much lower than the usual 30fps, etc. to conserve battery.
We have tried cpufreq utility to lower the clock frequencies and changing the governor settings, but it wasn’t good enough.
We also noticed the GPU clock speed can be configured in the device tree.
Is there any other places we can tweak? Can we change clock frequency for the DSP, hardware encoder/decoder or the ISP?
Any help is appreciated.