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cpuidle: psci: Prevent domain idlestates until consumers are ready

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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>
This commit is contained in:
Ulf Hansson 2020-07-07 14:58:04 +02:00 committed by Rafael J. Wysocki
parent ee7c34caac
commit 81f94ddfec
1 changed files with 14 additions and 0 deletions
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14
drivers/cpuidle/cpuidle-psci-domain.c
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@ -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,
},
};