lib: psci: early suspend handler for platforms
This patch adds an early suspend handler, that executes with
SMP and data cache enabled. This handler allows platforms to
perform any early actions during the CPU suspend entry sequence.
This handler is optional and platforms can choose to implement it
depending on their needs. The `pwr_domain_suspend` handler still
exists and platforms can keep on using it without any side effects.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/lib/psci/psci_suspend.c b/lib/psci/psci_suspend.c
index 0d1589e..40ecdee 100644
--- a/lib/psci/psci_suspend.c
+++ b/lib/psci/psci_suspend.c
@@ -80,6 +80,17 @@
if (psci_spd_pm && psci_spd_pm->svc_suspend)
psci_spd_pm->svc_suspend(max_off_lvl);
+#if !HW_ASSISTED_COHERENCY
+ /*
+ * Plat. management: Allow the platform to perform any early
+ * actions required to power down the CPU. This might be useful for
+ * HW_ASSISTED_COHERENCY = 0 platforms that can safely perform these
+ * actions with data caches enabled.
+ */
+ if (psci_plat_pm_ops->pwr_domain_suspend_pwrdown_early)
+ psci_plat_pm_ops->pwr_domain_suspend_pwrdown_early(state_info);
+#endif
+
/*
* Store the re-entry information for the non-secure world.
*/