Please enable PSCI Idle config on ARM64 config in pcaman builds
$this->bbcode_second_pass_code('', 'CONFIG_ARM_PSCI_CPUIDLE=y
CONFIG_ARM_PSCI_FW=y')
On My RK3399 board I would get the following
$this->bbcode_second_pass_code('', ' $ sudo cpupower idle-info
CPUidle driver: none
CPUidle governor: menu
analyzing CPU 0:
CPU 0: No idle states')
After enable the above config option
$this->bbcode_second_pass_code('', ' $ sudo cpupower monitor
| Idle_Stats
PKG|CORE| CPU| WFI | cpu- | clus
0| 0| 0| 0.00| 0.71| 61.09
0| 1| 1| 0.00| 0.65| 21.09
0| 2| 2| 0.04| 0.00| 99.76
0| 3| 3| 0.00| 0.13| 40.94
1| 0| 4| 0.00| 0.00| 0.00
1| 1| 5| 0.00| 0.00| 93.46
')
Thanks