summaryrefslogtreecommitdiff
path: root/include/linux/pm_domain.h
diff options
context:
space:
mode:
authorViresh Kumar <viresh.kumar@linaro.org>2017-10-12 12:37:23 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-14 01:46:04 +0300
commit42f6284ae602469762ee721ec31ddfc6170e00bc (patch)
tree5db49df2f5c48a9a1cf45eec840b77aba84560f7 /include/linux/pm_domain.h
parent9e9704ea5baf09e4c61be5901439da34c39995d0 (diff)
downloadlinux-42f6284ae602469762ee721ec31ddfc6170e00bc.tar.xz
PM / Domains: Add support to select performance-state of domains
Some platforms have the capability to configure the performance state of PM domains. This patch enhances the genpd core to support such platforms. The performance levels (within the genpd core) are identified by positive integer values, a lower value represents lower performance state. This patch adds a new genpd API, which is called by user drivers (like OPP framework): - int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state); This updates the performance state constraint of the device on its PM domain. On success, the genpd will have its performance state set to a value which is >= "state" passed to this routine. The genpd core calls the genpd->set_performance_state() callback, if implemented, else -ENODEV is returned to the caller. The PM domain drivers need to implement the following callback if they want to support performance states. - int (*set_performance_state)(struct generic_pm_domain *genpd, unsigned int state); This is called internally by the genpd core on several occasions. The genpd core passes the genpd pointer and the aggregate of the performance states of the devices supported by that genpd to this callback. This callback must update the performance state of the genpd (in a platform dependent way). The power domains can avoid supplying above callback, if they don't support setting performance-states. Currently we aren't propagating performance state changes of a subdomain to its masters as we don't have hardware that needs it right now. Over that, the performance states of subdomain and its masters may not have one-to-one mapping and would require additional information. We can get back to this once we have hardware that needs it. Tested-by: Rajendra Nayak <rnayak@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/pm_domain.h')
-rw-r--r--include/linux/pm_domain.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 84f423d5633e..9af0356bd69c 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -64,8 +64,11 @@ struct generic_pm_domain {
unsigned int device_count; /* Number of devices */
unsigned int suspended_count; /* System suspend device counter */
unsigned int prepared_count; /* Suspend counter of prepared devices */
+ unsigned int performance_state; /* Aggregated max performance state */
int (*power_off)(struct generic_pm_domain *domain);
int (*power_on)(struct generic_pm_domain *domain);
+ int (*set_performance_state)(struct generic_pm_domain *genpd,
+ unsigned int state);
struct gpd_dev_ops dev_ops;
s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
bool max_off_time_changed;
@@ -121,6 +124,7 @@ struct generic_pm_domain_data {
struct pm_domain_data base;
struct gpd_timing_data td;
struct notifier_block nb;
+ unsigned int performance_state;
void *data;
};
@@ -148,6 +152,8 @@ extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
extern int pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
extern int pm_genpd_remove(struct generic_pm_domain *genpd);
+extern int dev_pm_genpd_set_performance_state(struct device *dev,
+ unsigned int state);
extern struct dev_power_governor simple_qos_governor;
extern struct dev_power_governor pm_domain_always_on_gov;
@@ -188,6 +194,12 @@ static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
return -ENOTSUPP;
}
+static inline int dev_pm_genpd_set_performance_state(struct device *dev,
+ unsigned int state)
+{
+ return -ENOTSUPP;
+}
+
#define simple_qos_governor (*(struct dev_power_governor *)(NULL))
#define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL))
#endif