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0de967f2 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a76caf55 ØE |
2 | /* |
3 | * devfreq_cooling: Thermal cooling device implementation for devices using | |
4 | * devfreq | |
5 | * | |
6 | * Copyright (C) 2014-2015 ARM Limited | |
7 | * | |
a76caf55 ØE |
8 | * TODO: |
9 | * - If OPPs are added or removed after devfreq cooling has | |
10 | * registered, the devfreq cooling won't react to it. | |
11 | */ | |
12 | ||
13 | #include <linux/devfreq.h> | |
14 | #include <linux/devfreq_cooling.h> | |
84e0d87c | 15 | #include <linux/energy_model.h> |
a76caf55 ØE |
16 | #include <linux/export.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/pm_opp.h> | |
04fa9c80 | 19 | #include <linux/pm_qos.h> |
a76caf55 ØE |
20 | #include <linux/thermal.h> |
21 | ||
9876b1a4 JM |
22 | #include <trace/events/thermal.h> |
23 | ||
04fa9c80 MK |
24 | #define HZ_PER_KHZ 1000 |
25 | #define SCALE_ERROR_MITIGATION 100 | |
2be83da8 | 26 | |
a76caf55 ØE |
27 | /** |
28 | * struct devfreq_cooling_device - Devfreq cooling device | |
a76caf55 ØE |
29 | * devfreq_cooling_device registered. |
30 | * @cdev: Pointer to associated thermal cooling device. | |
31 | * @devfreq: Pointer to associated devfreq device. | |
32 | * @cooling_state: Current cooling state. | |
a76caf55 ØE |
33 | * @freq_table: Pointer to a table with the frequencies sorted in descending |
34 | * order. You can index the table by cooling device state | |
615510fe LL |
35 | * @max_state: It is the last index, that is, one less than the number of the |
36 | * OPPs | |
37 | * @power_ops: Pointer to devfreq_cooling_power, a more precised model. | |
2be83da8 LL |
38 | * @res_util: Resource utilization scaling factor for the power. |
39 | * It is multiplied by 100 to minimize the error. It is used | |
40 | * for estimation of the power budget instead of using | |
615510fe LL |
41 | * 'utilization' (which is 'busy_time' / 'total_time'). |
42 | * The 'res_util' range is from 100 to power * 100 for the | |
43 | * corresponding 'state'. | |
1b5cb957 | 44 | * @capped_state: index to cooling state with in dynamic power budget |
04fa9c80 MK |
45 | * @req_max_freq: PM QoS request for limiting the maximum frequency |
46 | * of the devfreq device. | |
4401117b | 47 | * @em_pd: Energy Model for the associated Devfreq device |
a76caf55 ØE |
48 | */ |
49 | struct devfreq_cooling_device { | |
a76caf55 ØE |
50 | struct thermal_cooling_device *cdev; |
51 | struct devfreq *devfreq; | |
52 | unsigned long cooling_state; | |
a76caf55 | 53 | u32 *freq_table; |
615510fe | 54 | size_t max_state; |
a76caf55 | 55 | struct devfreq_cooling_power *power_ops; |
2be83da8 LL |
56 | u32 res_util; |
57 | int capped_state; | |
04fa9c80 | 58 | struct dev_pm_qos_request req_max_freq; |
4401117b | 59 | struct em_perf_domain *em_pd; |
a76caf55 ØE |
60 | }; |
61 | ||
a76caf55 ØE |
62 | static int devfreq_cooling_get_max_state(struct thermal_cooling_device *cdev, |
63 | unsigned long *state) | |
64 | { | |
65 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
66 | ||
615510fe | 67 | *state = dfc->max_state; |
a76caf55 ØE |
68 | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int devfreq_cooling_get_cur_state(struct thermal_cooling_device *cdev, | |
73 | unsigned long *state) | |
74 | { | |
75 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
76 | ||
77 | *state = dfc->cooling_state; | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, | |
83 | unsigned long state) | |
84 | { | |
85 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
86 | struct devfreq *df = dfc->devfreq; | |
87 | struct device *dev = df->dev.parent; | |
04fa9c80 | 88 | unsigned long freq; |
615510fe | 89 | int perf_idx; |
a76caf55 ØE |
90 | |
91 | if (state == dfc->cooling_state) | |
92 | return 0; | |
93 | ||
94 | dev_dbg(dev, "Setting cooling state %lu\n", state); | |
95 | ||
615510fe | 96 | if (state > dfc->max_state) |
a76caf55 ØE |
97 | return -EINVAL; |
98 | ||
4401117b | 99 | if (dfc->em_pd) { |
615510fe | 100 | perf_idx = dfc->max_state - state; |
4401117b | 101 | freq = dfc->em_pd->table[perf_idx].frequency * 1000; |
615510fe LL |
102 | } else { |
103 | freq = dfc->freq_table[state]; | |
104 | } | |
04fa9c80 MK |
105 | |
106 | dev_pm_qos_update_request(&dfc->req_max_freq, | |
107 | DIV_ROUND_UP(freq, HZ_PER_KHZ)); | |
a76caf55 ØE |
108 | |
109 | dfc->cooling_state = state; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | /** | |
615510fe LL |
115 | * get_perf_idx() - get the performance index corresponding to a frequency |
116 | * @em_pd: Pointer to device's Energy Model | |
117 | * @freq: frequency in kHz | |
a76caf55 | 118 | * |
615510fe LL |
119 | * Return: the performance index associated with the @freq, or |
120 | * -EINVAL if it wasn't found. | |
a76caf55 | 121 | */ |
615510fe | 122 | static int get_perf_idx(struct em_perf_domain *em_pd, unsigned long freq) |
a76caf55 ØE |
123 | { |
124 | int i; | |
125 | ||
615510fe LL |
126 | for (i = 0; i < em_pd->nr_perf_states; i++) { |
127 | if (em_pd->table[i].frequency == freq) | |
a76caf55 ØE |
128 | return i; |
129 | } | |
130 | ||
615510fe | 131 | return -EINVAL; |
a76caf55 ØE |
132 | } |
133 | ||
e34cab4c | 134 | static unsigned long get_voltage(struct devfreq *df, unsigned long freq) |
a76caf55 | 135 | { |
a76caf55 ØE |
136 | struct device *dev = df->dev.parent; |
137 | unsigned long voltage; | |
138 | struct dev_pm_opp *opp; | |
139 | ||
a76caf55 | 140 | opp = dev_pm_opp_find_freq_exact(dev, freq, true); |
a4e49c9b | 141 | if (PTR_ERR(opp) == -ERANGE) |
a76caf55 ØE |
142 | opp = dev_pm_opp_find_freq_exact(dev, freq, false); |
143 | ||
afd1f4e0 VK |
144 | if (IS_ERR(opp)) { |
145 | dev_err_ratelimited(dev, "Failed to find OPP for frequency %lu: %ld\n", | |
146 | freq, PTR_ERR(opp)); | |
147 | return 0; | |
148 | } | |
149 | ||
a76caf55 | 150 | voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */ |
8a31d9d9 | 151 | dev_pm_opp_put(opp); |
a76caf55 ØE |
152 | |
153 | if (voltage == 0) { | |
8327b830 | 154 | dev_err_ratelimited(dev, |
afd1f4e0 VK |
155 | "Failed to get voltage for frequency %lu\n", |
156 | freq); | |
a76caf55 ØE |
157 | } |
158 | ||
e34cab4c LL |
159 | return voltage; |
160 | } | |
161 | ||
229794ee LL |
162 | static void _normalize_load(struct devfreq_dev_status *status) |
163 | { | |
164 | if (status->total_time > 0xfffff) { | |
165 | status->total_time >>= 10; | |
166 | status->busy_time >>= 10; | |
167 | } | |
168 | ||
169 | status->busy_time <<= 10; | |
170 | status->busy_time /= status->total_time ? : 1; | |
171 | ||
172 | status->busy_time = status->busy_time ? : 1; | |
173 | status->total_time = 1024; | |
174 | } | |
2be83da8 | 175 | |
a76caf55 | 176 | static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cdev, |
a76caf55 ØE |
177 | u32 *power) |
178 | { | |
179 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
180 | struct devfreq *df = dfc->devfreq; | |
229794ee | 181 | struct devfreq_dev_status status; |
a76caf55 | 182 | unsigned long state; |
229794ee | 183 | unsigned long freq; |
2be83da8 | 184 | unsigned long voltage; |
615510fe | 185 | int res, perf_idx; |
a76caf55 | 186 | |
229794ee LL |
187 | mutex_lock(&df->lock); |
188 | status = df->last_status; | |
189 | mutex_unlock(&df->lock); | |
190 | ||
191 | freq = status.current_frequency; | |
192 | ||
615510fe | 193 | if (dfc->power_ops && dfc->power_ops->get_real_power) { |
2be83da8 LL |
194 | voltage = get_voltage(df, freq); |
195 | if (voltage == 0) { | |
196 | res = -EINVAL; | |
197 | goto fail; | |
198 | } | |
a76caf55 | 199 | |
2be83da8 LL |
200 | res = dfc->power_ops->get_real_power(df, power, freq, voltage); |
201 | if (!res) { | |
202 | state = dfc->capped_state; | |
4401117b | 203 | dfc->res_util = dfc->em_pd->table[state].power; |
2be83da8 | 204 | dfc->res_util *= SCALE_ERROR_MITIGATION; |
a76caf55 | 205 | |
2be83da8 LL |
206 | if (*power > 1) |
207 | dfc->res_util /= *power; | |
208 | } else { | |
209 | goto fail; | |
210 | } | |
211 | } else { | |
615510fe | 212 | /* Energy Model frequencies are in kHz */ |
4401117b | 213 | perf_idx = get_perf_idx(dfc->em_pd, freq / 1000); |
615510fe LL |
214 | if (perf_idx < 0) { |
215 | res = -EAGAIN; | |
216 | goto fail; | |
217 | } | |
2be83da8 | 218 | |
229794ee LL |
219 | _normalize_load(&status); |
220 | ||
615510fe | 221 | /* Scale power for utilization */ |
4401117b | 222 | *power = dfc->em_pd->table[perf_idx].power; |
615510fe LL |
223 | *power *= status.busy_time; |
224 | *power >>= 10; | |
2be83da8 | 225 | } |
a76caf55 | 226 | |
229794ee | 227 | trace_thermal_power_devfreq_get_power(cdev, &status, freq, *power); |
9876b1a4 | 228 | |
a76caf55 | 229 | return 0; |
2be83da8 LL |
230 | fail: |
231 | /* It is safe to set max in this case */ | |
232 | dfc->res_util = SCALE_ERROR_MITIGATION; | |
233 | return res; | |
a76caf55 ØE |
234 | } |
235 | ||
236 | static int devfreq_cooling_state2power(struct thermal_cooling_device *cdev, | |
615510fe | 237 | unsigned long state, u32 *power) |
a76caf55 ØE |
238 | { |
239 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
615510fe | 240 | int perf_idx; |
a76caf55 | 241 | |
615510fe | 242 | if (state > dfc->max_state) |
a76caf55 ØE |
243 | return -EINVAL; |
244 | ||
615510fe | 245 | perf_idx = dfc->max_state - state; |
4401117b | 246 | *power = dfc->em_pd->table[perf_idx].power; |
a76caf55 | 247 | |
a76caf55 ØE |
248 | return 0; |
249 | } | |
250 | ||
251 | static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, | |
a76caf55 ØE |
252 | u32 power, unsigned long *state) |
253 | { | |
254 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
255 | struct devfreq *df = dfc->devfreq; | |
229794ee LL |
256 | struct devfreq_dev_status status; |
257 | unsigned long freq; | |
2be83da8 | 258 | s32 est_power; |
a76caf55 ØE |
259 | int i; |
260 | ||
229794ee LL |
261 | mutex_lock(&df->lock); |
262 | status = df->last_status; | |
263 | mutex_unlock(&df->lock); | |
264 | ||
265 | freq = status.current_frequency; | |
266 | ||
615510fe | 267 | if (dfc->power_ops && dfc->power_ops->get_real_power) { |
2be83da8 LL |
268 | /* Scale for resource utilization */ |
269 | est_power = power * dfc->res_util; | |
270 | est_power /= SCALE_ERROR_MITIGATION; | |
271 | } else { | |
2be83da8 | 272 | /* Scale dynamic power for utilization */ |
229794ee | 273 | _normalize_load(&status); |
615510fe LL |
274 | est_power = power << 10; |
275 | est_power /= status.busy_time; | |
2be83da8 | 276 | } |
a76caf55 ØE |
277 | |
278 | /* | |
279 | * Find the first cooling state that is within the power | |
615510fe | 280 | * budget. The EM power table is sorted ascending. |
a76caf55 | 281 | */ |
615510fe | 282 | for (i = dfc->max_state; i > 0; i--) |
4401117b | 283 | if (est_power >= dfc->em_pd->table[i].power) |
a76caf55 ØE |
284 | break; |
285 | ||
615510fe LL |
286 | *state = dfc->max_state - i; |
287 | dfc->capped_state = *state; | |
288 | ||
9876b1a4 | 289 | trace_thermal_power_devfreq_limit(cdev, freq, *state, power); |
a76caf55 ØE |
290 | return 0; |
291 | } | |
292 | ||
293 | static struct thermal_cooling_device_ops devfreq_cooling_ops = { | |
294 | .get_max_state = devfreq_cooling_get_max_state, | |
295 | .get_cur_state = devfreq_cooling_get_cur_state, | |
296 | .set_cur_state = devfreq_cooling_set_cur_state, | |
297 | }; | |
298 | ||
299 | /** | |
615510fe LL |
300 | * devfreq_cooling_gen_tables() - Generate frequency table. |
301 | * @dfc: Pointer to devfreq cooling device. | |
302 | * @num_opps: Number of OPPs | |
a76caf55 | 303 | * |
615510fe LL |
304 | * Generate frequency table which holds the frequencies in descending |
305 | * order. That way its indexed by cooling device state. This is for | |
306 | * compatibility with drivers which do not register Energy Model. | |
a76caf55 ØE |
307 | * |
308 | * Return: 0 on success, negative error code on failure. | |
309 | */ | |
615510fe LL |
310 | static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc, |
311 | int num_opps) | |
a76caf55 ØE |
312 | { |
313 | struct devfreq *df = dfc->devfreq; | |
314 | struct device *dev = df->dev.parent; | |
a76caf55 | 315 | unsigned long freq; |
a76caf55 ØE |
316 | int i; |
317 | ||
615510fe | 318 | dfc->freq_table = kcalloc(num_opps, sizeof(*dfc->freq_table), |
a76caf55 | 319 | GFP_KERNEL); |
615510fe LL |
320 | if (!dfc->freq_table) |
321 | return -ENOMEM; | |
a76caf55 ØE |
322 | |
323 | for (i = 0, freq = ULONG_MAX; i < num_opps; i++, freq--) { | |
a76caf55 ØE |
324 | struct dev_pm_opp *opp; |
325 | ||
a76caf55 ØE |
326 | opp = dev_pm_opp_find_freq_floor(dev, &freq); |
327 | if (IS_ERR(opp)) { | |
615510fe LL |
328 | kfree(dfc->freq_table); |
329 | return PTR_ERR(opp); | |
a76caf55 ØE |
330 | } |
331 | ||
8a31d9d9 | 332 | dev_pm_opp_put(opp); |
615510fe | 333 | dfc->freq_table[i] = freq; |
a76caf55 ØE |
334 | } |
335 | ||
a76caf55 | 336 | return 0; |
a76caf55 ØE |
337 | } |
338 | ||
339 | /** | |
340 | * of_devfreq_cooling_register_power() - Register devfreq cooling device, | |
341 | * with OF and power information. | |
342 | * @np: Pointer to OF device_node. | |
343 | * @df: Pointer to devfreq device. | |
344 | * @dfc_power: Pointer to devfreq_cooling_power. | |
345 | * | |
346 | * Register a devfreq cooling device. The available OPPs must be | |
347 | * registered on the device. | |
348 | * | |
349 | * If @dfc_power is provided, the cooling device is registered with the | |
350 | * power extensions. For the power extensions to work correctly, | |
351 | * devfreq should use the simple_ondemand governor, other governors | |
352 | * are not currently supported. | |
353 | */ | |
3c99c2ce | 354 | struct thermal_cooling_device * |
a76caf55 ØE |
355 | of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, |
356 | struct devfreq_cooling_power *dfc_power) | |
357 | { | |
358 | struct thermal_cooling_device *cdev; | |
615510fe | 359 | struct device *dev = df->dev.parent; |
a76caf55 | 360 | struct devfreq_cooling_device *dfc; |
f8d354e8 | 361 | char *name; |
615510fe | 362 | int err, num_opps; |
a76caf55 ØE |
363 | |
364 | dfc = kzalloc(sizeof(*dfc), GFP_KERNEL); | |
365 | if (!dfc) | |
366 | return ERR_PTR(-ENOMEM); | |
367 | ||
368 | dfc->devfreq = df; | |
369 | ||
4401117b LL |
370 | dfc->em_pd = em_pd_get(dev); |
371 | if (dfc->em_pd) { | |
a76caf55 ØE |
372 | devfreq_cooling_ops.get_requested_power = |
373 | devfreq_cooling_get_requested_power; | |
374 | devfreq_cooling_ops.state2power = devfreq_cooling_state2power; | |
375 | devfreq_cooling_ops.power2state = devfreq_cooling_power2state; | |
615510fe LL |
376 | |
377 | dfc->power_ops = dfc_power; | |
378 | ||
4401117b | 379 | num_opps = em_pd_nr_perf_states(dfc->em_pd); |
615510fe LL |
380 | } else { |
381 | /* Backward compatibility for drivers which do not use IPA */ | |
382 | dev_dbg(dev, "missing EM for cooling device\n"); | |
383 | ||
384 | num_opps = dev_pm_opp_get_opp_count(dev); | |
385 | ||
386 | err = devfreq_cooling_gen_tables(dfc, num_opps); | |
387 | if (err) | |
388 | goto free_dfc; | |
a76caf55 ØE |
389 | } |
390 | ||
615510fe LL |
391 | if (num_opps <= 0) { |
392 | err = -EINVAL; | |
a76caf55 | 393 | goto free_dfc; |
615510fe LL |
394 | } |
395 | ||
396 | /* max_state is an index, not a counter */ | |
397 | dfc->max_state = num_opps - 1; | |
a76caf55 | 398 | |
615510fe | 399 | err = dev_pm_qos_add_request(dev, &dfc->req_max_freq, |
04fa9c80 MK |
400 | DEV_PM_QOS_MAX_FREQUENCY, |
401 | PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); | |
2f96c035 | 402 | if (err < 0) |
615510fe | 403 | goto free_table; |
04fa9c80 | 404 | |
9aa80ab2 | 405 | err = -ENOMEM; |
f8d354e8 DL |
406 | name = kasprintf(GFP_KERNEL, "devfreq-%s", dev_name(dev)); |
407 | if (!name) | |
04fa9c80 | 408 | goto remove_qos_req; |
615510fe | 409 | |
f8d354e8 | 410 | cdev = thermal_of_cooling_device_register(np, name, dfc, |
a76caf55 | 411 | &devfreq_cooling_ops); |
f8d354e8 DL |
412 | kfree(name); |
413 | ||
a76caf55 ØE |
414 | if (IS_ERR(cdev)) { |
415 | err = PTR_ERR(cdev); | |
615510fe | 416 | dev_err(dev, |
a76caf55 ØE |
417 | "Failed to register devfreq cooling device (%d)\n", |
418 | err); | |
f8d354e8 | 419 | goto remove_qos_req; |
a76caf55 ØE |
420 | } |
421 | ||
422 | dfc->cdev = cdev; | |
423 | ||
3c99c2ce | 424 | return cdev; |
a76caf55 | 425 | |
04fa9c80 MK |
426 | remove_qos_req: |
427 | dev_pm_qos_remove_request(&dfc->req_max_freq); | |
615510fe | 428 | free_table: |
a76caf55 ØE |
429 | kfree(dfc->freq_table); |
430 | free_dfc: | |
431 | kfree(dfc); | |
432 | ||
433 | return ERR_PTR(err); | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(of_devfreq_cooling_register_power); | |
436 | ||
437 | /** | |
438 | * of_devfreq_cooling_register() - Register devfreq cooling device, | |
439 | * with OF information. | |
440 | * @np: Pointer to OF device_node. | |
441 | * @df: Pointer to devfreq device. | |
442 | */ | |
3c99c2ce | 443 | struct thermal_cooling_device * |
a76caf55 ØE |
444 | of_devfreq_cooling_register(struct device_node *np, struct devfreq *df) |
445 | { | |
446 | return of_devfreq_cooling_register_power(np, df, NULL); | |
447 | } | |
448 | EXPORT_SYMBOL_GPL(of_devfreq_cooling_register); | |
449 | ||
450 | /** | |
451 | * devfreq_cooling_register() - Register devfreq cooling device. | |
452 | * @df: Pointer to devfreq device. | |
453 | */ | |
3c99c2ce | 454 | struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df) |
a76caf55 ØE |
455 | { |
456 | return of_devfreq_cooling_register(NULL, df); | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(devfreq_cooling_register); | |
459 | ||
84e0d87c LL |
460 | /** |
461 | * devfreq_cooling_em_register_power() - Register devfreq cooling device with | |
462 | * power information and automatically register Energy Model (EM) | |
463 | * @df: Pointer to devfreq device. | |
464 | * @dfc_power: Pointer to devfreq_cooling_power. | |
465 | * | |
466 | * Register a devfreq cooling device and automatically register EM. The | |
467 | * available OPPs must be registered for the device. | |
468 | * | |
469 | * If @dfc_power is provided, the cooling device is registered with the | |
470 | * power extensions. It is using the simple Energy Model which requires | |
471 | * "dynamic-power-coefficient" a devicetree property. To not break drivers | |
472 | * which miss that DT property, the function won't bail out when the EM | |
473 | * registration failed. The cooling device will be registered if everything | |
474 | * else is OK. | |
475 | */ | |
476 | struct thermal_cooling_device * | |
477 | devfreq_cooling_em_register(struct devfreq *df, | |
478 | struct devfreq_cooling_power *dfc_power) | |
479 | { | |
480 | struct thermal_cooling_device *cdev; | |
481 | struct device *dev; | |
482 | int ret; | |
483 | ||
484 | if (IS_ERR_OR_NULL(df)) | |
485 | return ERR_PTR(-EINVAL); | |
486 | ||
487 | dev = df->dev.parent; | |
488 | ||
489 | ret = dev_pm_opp_of_register_em(dev, NULL); | |
490 | if (ret) | |
491 | dev_dbg(dev, "Unable to register EM for devfreq cooling device (%d)\n", | |
492 | ret); | |
493 | ||
494 | cdev = of_devfreq_cooling_register_power(dev->of_node, df, dfc_power); | |
495 | ||
496 | if (IS_ERR_OR_NULL(cdev)) | |
497 | em_dev_unregister_perf_domain(dev); | |
498 | ||
499 | return cdev; | |
500 | } | |
501 | EXPORT_SYMBOL_GPL(devfreq_cooling_em_register); | |
502 | ||
a76caf55 ØE |
503 | /** |
504 | * devfreq_cooling_unregister() - Unregister devfreq cooling device. | |
1b5cb957 | 505 | * @cdev: Pointer to devfreq cooling device to unregister. |
84e0d87c LL |
506 | * |
507 | * Unregisters devfreq cooling device and related Energy Model if it was | |
508 | * present. | |
a76caf55 | 509 | */ |
3c99c2ce | 510 | void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) |
a76caf55 | 511 | { |
3c99c2ce | 512 | struct devfreq_cooling_device *dfc; |
84e0d87c | 513 | struct device *dev; |
3c99c2ce | 514 | |
84e0d87c | 515 | if (IS_ERR_OR_NULL(cdev)) |
a76caf55 ØE |
516 | return; |
517 | ||
3c99c2ce | 518 | dfc = cdev->devdata; |
84e0d87c | 519 | dev = dfc->devfreq->dev.parent; |
3c99c2ce | 520 | |
a76caf55 | 521 | thermal_cooling_device_unregister(dfc->cdev); |
04fa9c80 | 522 | dev_pm_qos_remove_request(&dfc->req_max_freq); |
84e0d87c LL |
523 | |
524 | em_dev_unregister_perf_domain(dev); | |
525 | ||
a76caf55 | 526 | kfree(dfc->freq_table); |
a76caf55 ØE |
527 | kfree(dfc); |
528 | } | |
529 | EXPORT_SYMBOL_GPL(devfreq_cooling_unregister); |