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PM / Domains: Provide an always on power domain governor 

Since systems are likely to have power domains that can't be turned off
for various reasons at least temporarily while implementing power domain
support provide a default governor which will always refuse to power off
the domain, saving platforms having to implement their own.

Since the code is so tiny don't bother with a Kconfig symbol for it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Mark Brown 2011-12-08 23:27:28 +01:00 committed by Rafael J. Wysocki
parent c9914854b4
commit 925b44a273
2 changed files with 15 additions and 0 deletions
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13
drivers/base/power/domain_governor.c
View File

@ -141,3 +141,16 @@ struct dev_power_governor simple_qos_governor = {
.stop_ok = default_stop_ok,
.power_down_ok = default_power_down_ok,
};
static bool always_on_power_down_ok(struct dev_pm_domain *domain)
{
return false;
}
/**
* pm_genpd_gov_always_on - A governor implementing an always-on policy
*/
struct dev_power_governor pm_domain_always_on_gov = {
.power_down_ok = always_on_power_down_ok,
.stop_ok = default_stop_ok,
};

2
include/linux/pm_domain.h
View File

@ -140,6 +140,7 @@ extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
extern bool default_stop_ok(struct device *dev);
extern struct dev_power_governor pm_domain_always_on_gov;
#else
static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
@ -193,6 +194,7 @@ static inline bool default_stop_ok(struct device *dev)
{
return false;
}
#define pm_domain_always_on_gov NULL
#endif
static inline int pm_genpd_remove_callbacks(struct device *dev)