PM / Domains: Rework default device stop governor function, v2
The existing default device stop governor function for PM domains,
default_stop_ok(), is supposed to check whether or not the device's
PM QoS latency constraint will be violated if the device is stopped
by pm_genpd_runtime_suspend(). However, the computations carried out
by it don't reflect the definition of the PM QoS latency constrait in
Documentation/ABI/testing/sysfs-devices-power.
Make default_stop_ok() follow the definition of the PM QoS latency
constrait. In particular, make it take the device's start and stop
latencies correctly.
Add a new field, effective_constraint_ns, to struct gpd_timing_data
and use it to store the difference between the device's PM QoS
constraint and its resume latency for use by the device's parent
(the effective_constraint_ns values for the children are used for
computing the parent's one along with its PM QoS constraint).
Remove the break_even_ns field from struct gpd_timing_data, because
it's not used any more.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 91f8286..9c25219 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -93,7 +93,7 @@
s64 start_latency_ns;
s64 save_state_latency_ns;
s64 restore_state_latency_ns;
- s64 break_even_ns;
+ s64 effective_constraint_ns;
};
struct generic_pm_domain_data {