drivers/thermal/cpuidle_cooling.c

1 // SPDX-License-Identifier: GPL-2.0
8 #define pr_fmt(fmt) "cpuidle cooling: " fmt
20  * struct cpuidle_cooling_device - data for the idle cooling device
22  * @state: a normalized integer giving the state of the cooling device
32  * cpuidle_cooling_runtime - Running time computation
44  *  running = idle x ((100 / ratio) - 1)
48  *  running = (idle x 100) / ratio - idle
61 	return ((idle_duration_us * 100) / state) - idle_duration_us;  in cpuidle_cooling_runtime()
65  * cpuidle_cooling_get_max_state - Get the maximum state
66  * @cdev  : the thermal cooling device
94  * cpuidle_cooling_get_cur_state - Get the current cooling state
95  * @cdev: the thermal cooling device
99  * cooling device structure, the mapping is 1 <-> 1.
106 	struct cpuidle_cooling_device *idle_cdev = cdev->devdata;  in cpuidle_cooling_get_cur_state()
108 	*state = idle_cdev->state;  in cpuidle_cooling_get_cur_state()
114  * cpuidle_cooling_set_cur_state - Set the current cooling state
115  * @cdev: the thermal cooling device
120  * cooling device. In any case, it updates the internal state for the
121  * cooling device.
128 	struct cpuidle_cooling_device *idle_cdev = cdev->devdata;  in cpuidle_cooling_set_cur_state()
129 	struct idle_inject_device *ii_dev = idle_cdev->ii_dev;  in cpuidle_cooling_set_cur_state()
130 	unsigned long current_state = idle_cdev->state;  in cpuidle_cooling_set_cur_state()
133 	idle_cdev->state = state;  in cpuidle_cooling_set_cur_state()
151  * cpuidle_cooling_ops - thermal cooling device ops
160  * __cpuidle_cooling_register: register the cooling device
162  * @np: a device node structure pointer used for the thermal binding
164  * This function is in charge of allocating the cpuidle cooling device
166  * cooling device to the thermal framework.
184 		ret = -ENOMEM;  in __cpuidle_cooling_register()
194 	ii_dev = idle_inject_register(drv->cpumask);  in __cpuidle_cooling_register()
196 		ret = -EINVAL;  in __cpuidle_cooling_register()
200 	of_property_read_u32(np, "duration-us", &idle_duration_us);  in __cpuidle_cooling_register()
201 	of_property_read_u32(np, "exit-latency-us", &latency_us);  in __cpuidle_cooling_register()
206 	idle_cdev->ii_dev = ii_dev;  in __cpuidle_cooling_register()
208 	snprintf(dev_name, sizeof(dev_name), "thermal-idle-%d", id);  in __cpuidle_cooling_register()
233  * cpuidle_cooling_register - Idle cooling device initialization function
236  * This function is in charge of creating a cooling device per cpuidle
248 	for_each_cpu(cpu, drv->cpumask) {  in cpuidle_cooling_register()
252 		cooling_node = of_get_child_by_name(cpu_node, "thermal-idle");  in cpuidle_cooling_register()
257 			pr_debug("'thermal-idle' node not found for cpu%d\n", cpu);  in cpuidle_cooling_register()
266 			pr_err("Failed to register the cpuidle cooling device" \  in cpuidle_cooling_register()