Dear Sylwester, Kernel 5.3rc1 Hardware Odroid-XU4 cpuidle-big_little driver for exynos 5422 of odroid-xu3/4 is not working. when I enable it in the defconfig , CONFIG_ARM_BIG_LITTLE_CPUIDLE=y, the device will not boot and the heartbeat blue LED stops. when the powerdown state[1] is removed form cpuidle-big_little driver or the function bl_enter_powerdown is disabled by early return, the kernel boots successfully and I can see cpuidle driver inside /sys/devices/system/cpu/cpuidle/current_driver both cpuidle-big_little power down state (exynos5420) and suspend stuff are using mcpm_cpu_suspend() which in turn calls mcpm_cpu_power_down() eventually. while suspend stuff is working correctly and the cpu can suspend/resume without problems, the cpuidle-bl is not working the few difference between suspend.c and cpuidle-big_little that I found are suspend.c do some more preparations such as storing resume entry point "mcpm_entry_point" into S5P_INFORM0, reset EXYNOS5420_CPU_STATE and save and restore some other registers. Can we repeat the scenario of suspend in cpuidle-big_little Best Regards -- Jaafar Khalaf
