[Redmi Note 3 - Kenzo] 4th Cortex-A53 core idle/underutilized even on heavy load

[Redmi Note 3 - Kenzo] 4th Cortex-A53 core idle/underutilized even on heavy load
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Bug Description:
The 4th Cortex-A53 core (CPU3) does not seem to work even on the heaviest load like games or video decoding/ encoding, while the other cores are maxed out.

Affected Version:
MK90.0-kenzo-200720-RELEASE

Steps to Replicate:
Note: The tests are performed right after a fresh reboot with no kernel modification whatsoever

1440p60 VP9 video playback from local storage using MPV-Android with software decoding.


Transcoding the same video to H.265 with FFMPEG

While losing a small A53 core doesn’t really affect normal operations at all. But when it comes to CPU heavy task like video decoding/encoding and gaming it does make a difference.