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PM / Domains: Provide an always on power domain governor

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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)