Add standby state support in PSCI cpu_suspend api
This patch adds support in the generic PSCI implementation to call a
platform specific function to enter a standby state using an example
implementation in ARM FVP port
Fixes ARM-software/tf-issues#94
Change-Id: Ic1263fcf25f28e09162ad29dca954125f9aa8cc9
diff --git a/plat/fvp/plat_pm.c b/plat/fvp/plat_pm.c
index dd7a4b3..7b51476 100644
--- a/plat/fvp/plat_pm.c
+++ b/plat/fvp/plat_pm.c
@@ -44,6 +44,29 @@
#include <psci.h>
/*******************************************************************************
+ * FVP handler called when an affinity instance is about to enter standby.
+ ******************************************************************************/
+int fvp_affinst_standby(unsigned int power_state)
+{
+ unsigned int target_afflvl;
+
+ /* Sanity check the requested state */
+ target_afflvl = psci_get_pstate_afflvl(power_state);
+
+ /*
+ * It's possible to enter standby only on affinity level 0 i.e. a cpu
+ * on the FVP. Ignore any other affinity level.
+ */
+ if (target_afflvl != MPIDR_AFFLVL0)
+ return PSCI_E_INVALID_PARAMS;
+
+ /* Enter standby state */
+ wfi();
+
+ return PSCI_E_SUCCESS;
+}
+
+/*******************************************************************************
* FVP handler called when an affinity instance is about to be turned on. The
* level and mpidr determine the affinity instance.
******************************************************************************/
@@ -372,7 +395,7 @@
* Export the platform handlers to enable psci to invoke them
******************************************************************************/
static plat_pm_ops fvp_plat_pm_ops = {
- 0,
+ fvp_affinst_standby,
fvp_affinst_on,
fvp_affinst_off,
fvp_affinst_suspend,