[lkml]   [2019]   [Sep]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: cpuidle big_little driver on Odroid-xu4
On Sun, 1 Sep 2019 at 15:19, Jaafar Ali <> wrote:
> 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

Hi Jaafar,

Thank you for the report. I am not sure whether big-little cpuidle was
working properly before... (before v5.3-rc1) I added your report to

Best regards,

 \ /
  Last update: 2019-09-06 09:53    [W:0.039 / U:9.660 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site