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author | Ulf Hansson <ulf.hansson@linaro.org> | 2024-05-27 16:25:54 +0200 |
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committer | Ulf Hansson <ulf.hansson@linaro.org> | 2024-08-05 13:23:34 +0200 |
commit | c7b45284ab3012d21a02cf4448df32c655c32afb (patch) | |
tree | 0f51a124753a0979a9989037bc25195240f65e59 /drivers/cpuidle/cpuidle-psci-domain.c | |
parent | 9094e53ff5c86ebe372ad3960c3216c9817a1a04 (diff) | |
download | lwn-c7b45284ab3012d21a02cf4448df32c655c32afb.tar.gz lwn-c7b45284ab3012d21a02cf4448df32c655c32afb.zip |
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: 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
Diffstat (limited to 'drivers/cpuidle/cpuidle-psci-domain.c')
-rw-r--r-- | drivers/cpuidle/cpuidle-psci-domain.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index fae958794339..ea28b73ef3fb 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -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; |