@@ -408,6 +408,43 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
}
EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
+int dev_pm_genpd_get_performance_state(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+ unsigned int state;
+
+ genpd = dev_to_genpd_safe(dev);
+ if (IS_ERR(genpd))
+ return -ENODEV;
+
+ genpd_lock(genpd);
+ state = genpd->performance_state;
+ genpd_unlock(genpd);
+
+ return state;
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_get_performance_state);
+
+int dev_pm_genpd_performance_state_count(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+ int count;
+
+ genpd = dev_to_genpd_safe(dev);
+ if (IS_ERR(genpd))
+ return -ENODEV;
+
+ if (unlikely(!genpd->get_performance_state_count))
+ return -EINVAL;
+
+ genpd_lock(genpd);
+ count = genpd->get_performance_state_count(genpd);
+ genpd_unlock(genpd);
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_performance_state_count);
+
static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
{
unsigned int state_idx = genpd->state_idx;
@@ -117,6 +117,7 @@ struct generic_pm_domain {
struct dev_pm_opp *opp);
int (*set_performance_state)(struct generic_pm_domain *genpd,
unsigned int state);
+ int (*get_performance_state_count)(struct generic_pm_domain *genpd);
struct gpd_dev_ops dev_ops;
s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
bool max_off_time_changed;
@@ -204,6 +205,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
int pm_genpd_remove(struct generic_pm_domain *genpd);
int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
+int dev_pm_genpd_get_performance_state(struct device *dev);
+int dev_pm_genpd_performance_state_count(struct device *dev);
extern struct dev_power_governor simple_qos_governor;
extern struct dev_power_governor pm_domain_always_on_gov;
@@ -251,6 +254,16 @@ static inline int dev_pm_genpd_set_performance_state(struct device *dev,
return -ENOTSUPP;
}
+static inline int dev_pm_genpd_get_performance_state(struct device *dev)
+{
+ return -ENOTSUPP;
+}
+
+static inline int dev_pm_genpd_performance_state_count(struct device *dev)
+{
+ return -ENOTSUPP;
+}
+
#define simple_qos_governor (*(struct dev_power_governor *)(NULL))
#define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL))
#endif
Add two new APIs in the genpd framework, dev_pm_genpd_get_performance_state to return the current performance state of a power domain and dev_pm_genpd_performance_state_count to return the total number of performance states supported by a power domain. Since the genpd framework does not maintain a count of number of performance states supported by a power domain, introduce a new callback(.get_performance_state_count) that can be used to retrieve this information from power domain drivers. These APIs are added to aid the implementation of a power domain as a warming device. Linux kernel cooling device framework(into which warming device can be plugged in) requires during initialization to be provided with the maximum number of states that can be supported. When a power domain acts as a warming device, the max state is the max number of perfomrance states supported by the power domain. The cooling device framework implements API to retrieve the current state of the cooling device. This in turn translates to the current performance state of the power domain. Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> --- v1->v2: - Use dev_to_genpd_safe when accessing genpd from a device pointer. - Change the format of dev_pm_genpd_get_performance_state and dev_pm_genpd_performance_state_count to return back the requested parameter rather than taking a point parameter as input. drivers/base/power/domain.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 13 +++++++++++++ 2 files changed, 50 insertions(+)