pmdomain: Respect the CPU system wakeup QoS limit for cpuidle

The CPU system wakeup QoS limit must be respected for the regular cpuidle
state selection. Therefore, let's extend the genpd governor for CPUs to
take the constraint into account when it selects a domain idle state for
the corresponding PM domain.

Reviewed-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Kevin Hilman (TI) <khilman@baylibre.com>
Tested-by: Kevin Hilman (TI) <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/20251125112650.329269-4-ulf.hansson@linaro.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/pmdomain/governor.c b/drivers/pmdomain/governor.c
index bd1b9d66d4a5629386831560b83b0d310121c69b..05e68680f34ba2c71db54f02d1e2ab1481d27ccd 100644 (file)
--- a/drivers/pmdomain/governor.c
+++ b/drivers/pmdomain/governor.c
@@ -351,7 +351,7 @@ static bool cpu_power_down_ok(struct dev_pm_domain *pd)
        ktime_t domain_wakeup, next_hrtimer;
        ktime_t now = ktime_get();
        struct device *cpu_dev;
-       s64 cpu_constraint, global_constraint;
+       s64 cpu_constraint, global_constraint, wakeup_constraint;
        s64 idle_duration_ns;
        int cpu, i;
 
@@ -362,7 +362,11 @@ static bool cpu_power_down_ok(struct dev_pm_domain *pd)
        if (!(genpd->flags & GENPD_FLAG_CPU_DOMAIN))
                return true;
 
+       wakeup_constraint = cpu_wakeup_latency_qos_limit();
        global_constraint = cpu_latency_qos_limit();
+       if (global_constraint > wakeup_constraint)
+               global_constraint = wakeup_constraint;
+
        /*
         * Find the next wakeup for any of the online CPUs within the PM domain
         * and its subdomains. Note, we only need the genpd->cpus, as it already