Commit c7b45284 authored by Ulf Hansson's avatar Ulf Hansson
Browse files

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



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: default avatarUlf Hansson <ulf.hansson@linaro.org>
Tested-by: Raghavendra Kakarla <quic_rkakarla@quicinc.com>  # qcm6490 with PREEMPT_RT set
Acked-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240527142557.321610-5-ulf.hansson@linaro.org
parent 9094e53f

drivers/cpuidle/cpuidle-psci-domain.c

+7 −3
Original line number Diff line number Diff line
@@ -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;