tree ceb879d87b15ea26d705d87f3a4fdf06e00cb6e5
parent 4a826ddad8ea0fc5ce09709f534efb72cc33611c
author Achin Gupta <achin.gupta@arm.com> 1384274400 +0000
committer Dan Handley <dan.handley@arm.com> 1386246530 +0000

clear wakeup enable bit upon resuming from suspend

The FVP specific code that gets called after a cpu has been physically
powered on after having been turned off or suspended earlier does not
clear the PWRC.PWKUPR.WEN bit. Not doing so causes problems if: a cpu
is suspended, woken from suspend, powered down through a cpu_off call
& receives a spurious interrupt. Since the WEN bit is not cleared
after the cpu woke up from suspend, the spurious wakeup will power the
cpu on. Since the cpu_off call clears the jump address in the mailbox
this spurious wakeup will cause the cpu to crash.

This patch fixes this issue by clearing the WEN bit whenever a cpu is
powered up.

Change-Id: Ic91f5dffe1ed01d76bc7fc807acf0ecd3e38ce5b