[coreboot] EHCI wakeup on Haswell+Lynxpoint motherboards

[Аладышев Константин]

I have Haswell+LynxpointLP motherboard and Linux doesn't wakeup from USB
devices from S3. EHCI controller is listed in "/proc/acpi/wakeup" as
"enabled" and GPE number is seemed to be configured correctly in ACPI to
PME_B0, but it doesn't work.

What is need to be done to enable USB wakeup?

Does USB wakeup work on Haswell+Lynxpoint motherboards?