---------- Forwarded message ---------
From: Vivek yadav <linux.ninja23@xxxxxxxxx>
Date: Fri, Oct 11, 2024 at 3:14 PM
Subject: ARM64: CPUIdle driver is not select any Idle state other then WFI
To: <linux-pm@xxxxxxxxxxxxxxx>
Hi @all,
I am working on one custom SoC. Where I add one CPUIdle state for
``arm,cortex-a55`` processor.
idle-states {
entry-method = "psci";
cpu_ret_l: cpu-retention-l {
compatible = "arm,idle-state";
arm,psci-suspend-param = <0x00010001>;
local-timer-stop;
entry-latency-us = <55>;
exit-latency-us = <140>;
min-residency-us = <780>;
};
};
I am using ``Menu governor`` with the ``psci_idle driver`` in its original form.
After booting Linux I find out that the CPUIdle core is never going
inside the ``cpu-retention`` state.
To check time spent by CPU in any state. I am using the below command.
``cat /sys/devices/system/cpu/cpu*/cpuidle/state*/time``
OUTPUT:
0 ===>CPU0 state0 (WFI)
0 ===>CPU0 state1 (cpu-retention)
increasing some time value ===>CPU1 state0 (WFI)
0 ===>CPU1 state1 (cpu-retention)
increasing some time value
0
increasing some time value
0
What am I doing wrong? Why does ``cpu-retention`` state time not increase?
Any pointer will be helpful.
Regards,
Vivek
