[RFC 2/3] cpufreq: governor: Use minimum load QoS

Benjamin Gaignard
2020-05-26T15:17:32Z

Make sure that the returned load is above the system-wide minimum
load QoS.
Devices could set this specific QoS to inform governors about their
need in terms of CPU load when computing it from idle time isn't accurate.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
---
drivers/cpufreq/cpufreq_governor.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index f99ae45efaea..1494e5e4c788 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -118,6 +118,7 @@ unsigned int dbs_update(struct cpufreq_policy *policy)
unsigned int ignore_nice = dbs_data->ignore_nice_load;
unsigned int max_load = 0, idle_periods = UINT_MAX;
unsigned int sampling_rate, io_busy, j;
+ unsigned int qos_min_load;

/*
* Sometimes governors may use an additional multiplier to increase
@@ -225,6 +226,10 @@ unsigned int dbs_update(struct cpufreq_policy *policy)

policy_dbs->idle_periods = idle_periods;

+ qos_min_load = cpufreq_minload_qos_limit();
+ if (qos_min_load > max_load)
+ max_load = qos_min_load;
+
return max_load;
}
EXPORT_SYMBOL_GPL(dbs_update);
--
2.15.0