ARM64 / cpuidle: Use new cpuidle macro for entering retention state
CPU_PM_CPU_IDLE_ENTER_RETENTION skips calling cpu_pm_enter() and cpu_pm_exit(). By not calling cpu_pm functions in idle entry/exit paths we can reduce the latency involved in entering and exiting the low power idle state. On ARM64 based Qualcomm server platform we measured below overhead for calling cpu_pm_enter and cpu_pm_exit for retention states. workload: stress --hdd #CPUs --hdd-bytes 32M -t 30 Average overhead of cpu_pm_enter - 1.2us Average overhead of cpu_pm_exit - 3.1us Acked-by:Sudeep Holla <sudeep.holla@arm.com> Signed-off-by:
Prashanth Prakash <pprakash@codeaurora.org> Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com>
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