Tegra: per-soc `get_target_pwr_state` handler
This patch implements a per-soc handler to calculate the target
power state for the cluster/system. A weak implementation of the
handler is provided for platforms to use by default.
For SoCs with multiple CPU clusters, this handler would provide
the individual cluster/system state, allowing the PSCI service to
flush caches during cluster/system power down.
Change-Id: I568cdb42204f9841a8430bd9105bd694f71cf91d
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/common/tegra_pm.c b/plat/nvidia/tegra/common/tegra_pm.c
index 389346f..b2703dd 100644
--- a/plat/nvidia/tegra/common/tegra_pm.c
+++ b/plat/nvidia/tegra/common/tegra_pm.c
@@ -57,6 +57,7 @@
#pragma weak tegra_soc_pwr_domain_power_down_wfi
#pragma weak tegra_soc_prepare_system_reset
#pragma weak tegra_soc_prepare_system_off
+#pragma weak tegra_soc_get_target_pwr_state
int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
{
@@ -94,6 +95,23 @@
panic();
}
+plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
+ const plat_local_state_t *states,
+ unsigned int ncpu)
+{
+ plat_local_state_t target = PLAT_MAX_RET_STATE, temp;
+
+ assert(ncpu);
+
+ do {
+ temp = *states++;
+ if ((temp > target) && (temp != PLAT_MAX_OFF_STATE))
+ target = temp;
+ } while (--ncpu);
+
+ return target;
+}
+
/*******************************************************************************
* This handler is called by the PSCI implementation during the `SYSTEM_SUSPEND`
* call to get the `power_state` parameter. This allows the platform to encode
@@ -102,12 +120,9 @@
******************************************************************************/
void tegra_get_sys_suspend_power_state(psci_power_state_t *req_state)
{
- /* lower affinities use PLAT_MAX_OFF_STATE */
- for (int i = MPIDR_AFFLVL0; i < PLAT_MAX_PWR_LVL; i++)
- req_state->pwr_domain_state[i] = PLAT_MAX_OFF_STATE;
-
- /* max affinity uses system suspend state id */
- req_state->pwr_domain_state[PLAT_MAX_PWR_LVL] = PSTATE_ID_SOC_POWERDN;
+ /* all affinities use system suspend state id */
+ for (int i = MPIDR_AFFLVL0; i <= PLAT_MAX_PWR_LVL; i++)
+ req_state->pwr_domain_state[i] = PSTATE_ID_SOC_POWERDN;
}
/*******************************************************************************
@@ -333,15 +348,5 @@
const plat_local_state_t *states,
unsigned int ncpu)
{
- plat_local_state_t target = PLAT_MAX_RET_STATE, temp;
-
- assert(ncpu);
-
- do {
- temp = *states++;
- if ((temp > target) && (temp != PLAT_MAX_OFF_STATE))
- target = temp;
- } while (--ncpu);
-
- return target;
+ return tegra_soc_get_target_pwr_state(lvl, states, ncpu);
}