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PM / Domains: Rework default device stop governor function, v2

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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>
This commit is contained in:
Rafael J. Wysocki 2012-04-29 22:54:17 +02:00
parent 69964ea4c7
commit a5bef810ad
3 changed files with 51 additions and 5 deletions
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2
include/linux/pm_domain.h
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@ -93,7 +93,7 @@ struct gpd_timing_data {
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 {