acpi: Call SPMC entry/exit hooks if SPMC device is set

[obiwac_gmail.com]

Summary

Calls SPMC entry notification hook if acpi_spmc_device exists on the ACPI driver context before going to sleep, and calls the SPMC exit notification hook after we've woken up.

See D48387.

Test Plan

Framework 13 AMD Ryzen 7040 series enters a standby mode (power button led fades in and out slowly).

[shuriku_shurik.kiev.ua]

Suspend works on my Lenovo notebook. After resume there is no response to pressing keyboard keys in the console, but switching between terminals works.

[obiwac_gmail.com]

Awesome! I'll start work on reading residency counters on Intel (though the LPIT) soon, so we can check if the CPU is actually entering S0i3 on Intel :)

As per your keyboard issue, since switching between terminals works, I'm assuming this is not per se a driver issue - I guess this needs more work to debug. Does the keyboard still work after resuming in an X or Wayland session?

[shuriku_shurik.kiev.ua]

In D48735#1120542, @obiwac_gmail.com wrote:

Does the keyboard still work after resuming in an X or Wayland session?

I tested it without X session and i915kms loaded because screen remains black in an X session after resume.