cpuidle: psci: Activate GENPD_FLAG_ACTIVE_WAKEUP with OSI

Set GENPD_FLAG_ACTIVE_WAKEUP flag for domain psci cpuidle when OSI
is activated, then when a device is set as the wake-up source using
device_set_wakeup_path, the PSCI power domain could be retained to allow
so that the associated device can wake up the system.

With this flag, for S2IDLE system-wide suspend, the wake-up path is
managed in each device driver and is tested in the power framework:
a PSCI domain is only turned off when GENPD_FLAG_ACTIVE_WAKEUP is enabled
and the associated device is not in the wake-up path, so PSCI CPUIdle
selects the lowest level in the PSCI topology according to the wake-up
path.

This patch is a preliminary step to support PSCI OSI on the STM32MP25
platform with the D1 domain (power-domain-cluster) for the A35 cortex
cluster and for the associated peripherals including EXTI1 which manages
the wake-up interrupts for domain D1.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Message-ID: <20241119141827.1.I6129b16ec6b558efc1707861db87e55bf7022f62@changeid>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c
index 146f9706802249ef3710e1928e4a53f0c1b3b8f1..5fb5228f6bf1abe08111ea1487b67543cebe5bd0 100644 (file)
--- a/drivers/cpuidle/cpuidle-psci-domain.c
+++ b/drivers/cpuidle/cpuidle-psci-domain.c
@@ -72,6 +72,7 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
         */
        if (use_osi) {
                pd->power_off = psci_pd_power_off;
+               pd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
                if (IS_ENABLED(CONFIG_PREEMPT_RT))
                        pd->flags |= GENPD_FLAG_RPM_ALWAYS_ON;
        } else {