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| author | Ulf Hansson <ulf.hansson@linaro.org> | 2020-07-07 14:58:04 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-07-29 18:38:30 +0200 |
| commit | 81f94ddfeceddb3b8ffa6cfe5ddd3b896711d9ad (patch) | |
| tree | 304c9143d9580d5bf54c3942eb7a3e28c9124096 /drivers/cpuidle | |
| parent | ee7c34caac3892af08f9c4c91b834d2cb2871eb0 (diff) | |
| download | linux-81f94ddfeceddb3b8ffa6cfe5ddd3b896711d9ad.tar.gz | |
cpuidle: psci: Prevent domain idlestates until consumers are ready
Depending on the SoC/platform, additional devices may be part of the PSCI
PM domain topology. This is the case with 'qcom,rpmh-rsc' device, for
example, even if this is not yet visible in the corresponding DTS-files.
Without going into too much details, a device like the 'qcom,rpmh-rsc' may
have HW constraints that needs to be obeyed to, before a domain idlestate
can be picked.
Therefore, let's implement the ->sync_state() callback to receive a
notification when all consumers of the PSCI PM domain providers have been
attached/probed to it. In this way, we can make sure all constraints from
all relevant devices, are taken into account before allowing a domain
idlestate to be picked.
Acked-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/cpuidle-psci-domain.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index bf527d2bb4b62..b6e9649ab0da3 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -27,6 +27,7 @@ struct psci_pd_provider { }; static LIST_HEAD(psci_pd_providers); +static bool psci_pd_allow_domain_state; static int psci_pd_power_off(struct generic_pm_domain *pd) { @@ -36,6 +37,9 @@ static int psci_pd_power_off(struct generic_pm_domain *pd) if (!state->data) return 0; + if (!psci_pd_allow_domain_state) + return -EBUSY; + /* OSI mode is enabled, set the corresponding domain state. */ pd_state = state->data; psci_set_domain_state(*pd_state); @@ -222,6 +226,15 @@ static void psci_pd_remove_topology(struct device_node *np) psci_pd_init_topology(np, false); } +static void psci_cpuidle_domain_sync_state(struct device *dev) +{ + /* + * All devices have now been attached/probed to the PM domain topology, + * hence it's fine to allow domain states to be picked. + */ + psci_pd_allow_domain_state = true; +} + static const struct of_device_id psci_of_match[] = { { .compatible = "arm,psci-1.0" }, {} @@ -289,6 +302,7 @@ static struct platform_driver psci_cpuidle_domain_driver = { .driver = { .name = "psci-cpuidle-domain", .of_match_table = psci_of_match, + .sync_state = psci_cpuidle_domain_sync_state, }, }; |