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cpuidle: psci-domain: Enable system-wide suspend on PREEMPT_RT

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The domain-idle-states are currently disabled on a PREEMPT_RT based
configuration for the cpuidle-psci-domain. To enable them to be used for
system-wide suspend and in particular during s2idle, let's set the
GENPD_FLAG_RPM_ALWAYS_ON instead of GENPD_FLAG_ALWAYS_ON for the
corresponding genpd provider.

In this way, the runtime PM path remains disabled in genpd for its attached
devices, while powering-on/off the PM domain during system-wide suspend
becomes allowed.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Raghavendra Kakarla <quic_rkakarla@quicinc.com>  # qcm6490 with PREEMPT_RT set
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240527142557.321610-5-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2024-05-27 16:25:54 +02:00
parent 9094e53ff5
commit c7b45284ab
1 changed files with 7 additions and 3 deletions
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10
drivers/cpuidle/cpuidle-psci-domain.c
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@ -67,12 +67,16 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
/*
* Allow power off when OSI has been successfully enabled.
* PREEMPT_RT is not yet ready to enter domain idle states.
* On a PREEMPT_RT based configuration the domain idle states are
* supported, but only during system-wide suspend.
*/
if (use_osi && !IS_ENABLED(CONFIG_PREEMPT_RT))
if (use_osi) {
pd->power_off = psci_pd_power_off;
else
if (IS_ENABLED(CONFIG_PREEMPT_RT))
pd->flags |= GENPD_FLAG_RPM_ALWAYS_ON;
} else {
pd->flags |= GENPD_FLAG_ALWAYS_ON;
}
/* Use governor for CPU PM domains if it has some states to manage. */
pd_gov = pd->states ? &pm_domain_cpu_gov : NULL;