2  * drivers/base/power/domain_governor.c - Governors for device PM domains.
18  * default_stop_ok - Default PM domain governor routine for stopping devices.
23 	struct gpd_timing_data *td = &dev_gpd_data(dev)->td;  in default_stop_ok()
27 	if (dev->power.max_time_suspended_ns < 0 || td->break_even_ns == 0)  in default_stop_ok()
30 	return td->stop_latency_ns + td->start_latency_ns < td->break_even_ns  in default_stop_ok()
31 		&& td->break_even_ns < dev->power.max_time_suspended_ns;  in default_stop_ok()
35  * default_power_down_ok - Default generic PM domain power off governor routine.
49 	off_on_time_ns = genpd->power_off_latency_ns +  in default_power_down_ok()
50 				genpd->power_on_latency_ns;  in default_power_down_ok()
52 	 * It doesn't make sense to remove power from the domain if saving  in default_power_down_ok()
53 	 * the state of all devices in it and the power off/power on operations  in default_power_down_ok()
58 	list_for_each_entry(pdd, &genpd->dev_list, list_node) {  in default_power_down_ok()
59 		if (pdd->dev->driver)  in default_power_down_ok()
61 				to_gpd_data(pdd)->td.save_state_latency_ns;  in default_power_down_ok()
69 	list_for_each_entry(link, &genpd->master_links, master_node) {  in default_power_down_ok()
70 		struct generic_pm_domain *sd = link->slave;  in default_power_down_ok()
71 		s64 sd_max_off_ns = sd->max_off_time_ns;  in default_power_down_ok()
76 		sd_max_off_ns -= ktime_to_ns(ktime_sub(time_now,  in default_power_down_ok()
77 						       sd->power_off_time));  in default_power_down_ok()
90 	min_dev_off_time_ns = -1;  in default_power_down_ok()
91 	list_for_each_entry(pdd, &genpd->dev_list, list_node) {  in default_power_down_ok()
93 		struct device *dev = pdd->dev;  in default_power_down_ok()
96 		if (!dev->driver || dev->power.max_time_suspended_ns < 0)  in default_power_down_ok()
99 		td = &to_gpd_data(pdd)->td;  in default_power_down_ok()
100 		dev_off_time_ns = dev->power.max_time_suspended_ns -  in default_power_down_ok()
101 			(td->start_latency_ns + td->restore_state_latency_ns +  in default_power_down_ok()
103 						dev->power.suspend_time)));  in default_power_down_ok()
117 		genpd->max_off_time_ns = -1;  in default_power_down_ok()
126 	min_dev_off_time_ns -= genpd->power_on_latency_ns;  in default_power_down_ok()
131 	 * domain's power break even time, removing power from the domain is not  in default_power_down_ok()
134 	if (genpd->break_even_ns >  in default_power_down_ok()
135 	    min_dev_off_time_ns - genpd->power_off_latency_ns)  in default_power_down_ok()
138 	genpd->max_off_time_ns = min_dev_off_time_ns;  in default_power_down_ok()
165  * pm_genpd_gov_always_on - A governor implementing an always-on policy