Hi Yoma,

On 18/08/16 03:07, yoma sophian wrote:

hi Sudeep

quoted

Correct. What's the cpu enable method on your platform ? Is it PSCI  ?

No, the enable method is "spin-table"

Generally spin-table is used for the initial bring up. If one is
interested in full power management support on a platform, PSCI is the
recommended standard on ARM64.

quoted

If yes, does you PSCI implementation support SYSTEM_SUSPEND ? If
yes, it should work. Check your PSCI implementation otherwise.

if so, there are 2 things make me curious: a. I trace
arch/arm64/kernel/psci.c even arch/arm64/*, but I sill cannot find
where it create global suspend method table with suspend_set_ops. #
grep -rnw 'suspend_set_ops' ../linux-4.1/arch/arm64/ #

drivers/firmware/psci.c

except arch/xxx folder, there are
../linux-4.1/drivers/macintosh/via-pmu.c:2276:
suspend_set_ops(&pmu_pm_ops); ../linux-4.1/drivers/acpi/sleep.c:666:
suspend_set_ops(old_suspend_ordering ? Does that mean aarch64
register suspend_set_ops by apci flow when adopt PSCI
implementation?

Not yet, but may choose that from ACPI boot.

b. in arm64, if some platform has its own suspend flow,  couldn't it
adopts arm/match-xxx to register its own global suspend method?

No, PSCI is highly recommended.

-- 
Regards,
Sudeep