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
diff --git a/lib/psci/psci_common.c b/lib/psci/psci_common.c
index c6fea5b..e87e8c0 100644
--- a/lib/psci/psci_common.c
+++ b/lib/psci/psci_common.c
@@ -252,8 +252,8 @@
* function will be called after a cpu is powered on to find the local state
* each power domain has emerged from.
*****************************************************************************/
-static void psci_get_target_local_pwr_states(unsigned int end_pwrlvl,
- psci_power_state_t *target_state)
+void psci_get_target_local_pwr_states(unsigned int end_pwrlvl,
+ psci_power_state_t *target_state)
{
unsigned int parent_idx, lvl;
plat_local_state_t *pd_state = target_state->pwr_domain_state;