tree 8c194b98602c38799ef0c1b0078b04c2dd590f10
parent 3dd9835f8ab3c2e7f57ddc92505d6c800bbacd47
author Achin Gupta <achin.gupta@arm.com> 1467128775 +0100
committer Achin Gupta <achin.gupta@arm.com> 1469458380 +0100

Fix use of stale power states in PSCI standby finisher

A PSCI CPU_SUSPEND request to place a CPU in retention states at power levels
higher than the CPU power level is subject to the same state coordination as a
power down state. A CPU could implement multiple retention states at a
particular power level. When exiting WFI, the non-CPU power levels may be in a
different retention state to what was initially requested, therefore each CPU
should refresh its view of the states of all power levels.

Previously, a CPU re-used the state of the power levels when it entered the
retention state. This patch fixes this issue by ensuring that a CPU upon exit
from retention reads the state of each power level afresh.

Change-Id: I93b5f5065c63400c6fd2598dbaafac385748f989