Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e1f60b29 NM |
2 | /* |
3 | * Generic OPP Interface | |
4 | * | |
5 | * Copyright (C) 2009-2010 Texas Instruments Incorporated. | |
6 | * Nishanth Menon | |
7 | * Romit Dasgupta | |
8 | * Kevin Hilman | |
e1f60b29 NM |
9 | */ |
10 | ||
d6d2a528 VK |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
d54974c2 | 13 | #include <linux/clk.h> |
e1f60b29 NM |
14 | #include <linux/errno.h> |
15 | #include <linux/err.h> | |
e1f60b29 | 16 | #include <linux/slab.h> |
51990e82 | 17 | #include <linux/device.h> |
80126ce7 | 18 | #include <linux/export.h> |
009acd19 | 19 | #include <linux/pm_domain.h> |
9f8ea969 | 20 | #include <linux/regulator/consumer.h> |
e1f60b29 | 21 | |
f59d3ee8 | 22 | #include "opp.h" |
e1f60b29 NM |
23 | |
24 | /* | |
2c2709dc VK |
25 | * The root of the list of all opp-tables. All opp_table structures branch off |
26 | * from here, with each opp_table containing the list of opps it supports in | |
e1f60b29 NM |
27 | * various states of availability. |
28 | */ | |
f47b72a1 | 29 | LIST_HEAD(opp_tables); |
7eba0c76 VK |
30 | |
31 | /* OPP tables with uninitialized required OPPs */ | |
32 | LIST_HEAD(lazy_opp_tables); | |
33 | ||
e1f60b29 | 34 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 35 | DEFINE_MUTEX(opp_table_lock); |
27c09484 VK |
36 | /* Flag indicating that opp_tables list is being updated at the moment */ |
37 | static bool opp_tables_busy; | |
e1f60b29 | 38 | |
9e62edac | 39 | static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table) |
06441658 | 40 | { |
2c2709dc | 41 | struct opp_device *opp_dev; |
9e62edac | 42 | bool found = false; |
06441658 | 43 | |
9e62edac | 44 | mutex_lock(&opp_table->lock); |
2c2709dc | 45 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
9e62edac VK |
46 | if (opp_dev->dev == dev) { |
47 | found = true; | |
48 | break; | |
49 | } | |
06441658 | 50 | |
9e62edac VK |
51 | mutex_unlock(&opp_table->lock); |
52 | return found; | |
06441658 VK |
53 | } |
54 | ||
6ac42397 | 55 | static struct opp_table *_find_opp_table_unlocked(struct device *dev) |
5b650b38 VK |
56 | { |
57 | struct opp_table *opp_table; | |
58 | ||
59 | list_for_each_entry(opp_table, &opp_tables, node) { | |
9e62edac | 60 | if (_find_opp_dev(dev, opp_table)) { |
5b650b38 | 61 | _get_opp_table_kref(opp_table); |
5b650b38 VK |
62 | return opp_table; |
63 | } | |
64 | } | |
65 | ||
66 | return ERR_PTR(-ENODEV); | |
67 | } | |
68 | ||
e1f60b29 | 69 | /** |
2c2709dc VK |
70 | * _find_opp_table() - find opp_table struct using device pointer |
71 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 72 | * |
052c6f19 | 73 | * Search OPP table for one containing matching device. |
e1f60b29 | 74 | * |
2c2709dc | 75 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
76 | * -EINVAL based on type of error. |
77 | * | |
5b650b38 | 78 | * The callers must call dev_pm_opp_put_opp_table() after the table is used. |
e1f60b29 | 79 | */ |
2c2709dc | 80 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 81 | { |
2c2709dc | 82 | struct opp_table *opp_table; |
e1f60b29 | 83 | |
50a3cb04 | 84 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
85 | pr_err("%s: Invalid parameters\n", __func__); |
86 | return ERR_PTR(-EINVAL); | |
87 | } | |
88 | ||
5b650b38 VK |
89 | mutex_lock(&opp_table_lock); |
90 | opp_table = _find_opp_table_unlocked(dev); | |
91 | mutex_unlock(&opp_table_lock); | |
e1f60b29 | 92 | |
5b650b38 | 93 | return opp_table; |
e1f60b29 NM |
94 | } |
95 | ||
96 | /** | |
d6d00742 | 97 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
98 | * @opp: opp for which voltage has to be returned for |
99 | * | |
984f16c8 | 100 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
101 | * return 0 |
102 | * | |
dfbe4678 | 103 | * This is useful only for devices with single power supply. |
e1f60b29 | 104 | */ |
47d43ba7 | 105 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 106 | { |
052c6f19 | 107 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 108 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
109 | return 0; |
110 | } | |
e1f60b29 | 111 | |
052c6f19 | 112 | return opp->supplies[0].u_volt; |
e1f60b29 | 113 | } |
5d4879cd | 114 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
115 | |
116 | /** | |
5d4879cd | 117 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
118 | * @opp: opp for which frequency has to be returned for |
119 | * | |
984f16c8 | 120 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 | 121 | * return 0 |
e1f60b29 | 122 | */ |
47d43ba7 | 123 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 124 | { |
06a8a059 | 125 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 126 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
127 | return 0; |
128 | } | |
e1f60b29 | 129 | |
052c6f19 | 130 | return opp->rate; |
e1f60b29 | 131 | } |
5d4879cd | 132 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 133 | |
5b93ac54 RN |
134 | /** |
135 | * dev_pm_opp_get_level() - Gets the level corresponding to an available opp | |
136 | * @opp: opp for which level value has to be returned for | |
137 | * | |
138 | * Return: level read from device tree corresponding to the opp, else | |
139 | * return 0. | |
140 | */ | |
141 | unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp) | |
142 | { | |
143 | if (IS_ERR_OR_NULL(opp) || !opp->available) { | |
144 | pr_err("%s: Invalid parameters\n", __func__); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | return opp->level; | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_level); | |
151 | ||
597ff543 DO |
152 | /** |
153 | * dev_pm_opp_get_required_pstate() - Gets the required performance state | |
154 | * corresponding to an available opp | |
155 | * @opp: opp for which performance state has to be returned for | |
156 | * @index: index of the required opp | |
157 | * | |
158 | * Return: performance state read from device tree corresponding to the | |
159 | * required opp, else return 0. | |
160 | */ | |
161 | unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp, | |
162 | unsigned int index) | |
163 | { | |
164 | if (IS_ERR_OR_NULL(opp) || !opp->available || | |
165 | index >= opp->opp_table->required_opp_count) { | |
166 | pr_err("%s: Invalid parameters\n", __func__); | |
167 | return 0; | |
168 | } | |
169 | ||
7eba0c76 VK |
170 | /* required-opps not fully initialized yet */ |
171 | if (lazy_linking_pending(opp->opp_table)) | |
172 | return 0; | |
173 | ||
597ff543 DO |
174 | return opp->required_opps[index]->pstate; |
175 | } | |
176 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate); | |
177 | ||
19445b25 BZ |
178 | /** |
179 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
180 | * @opp: opp for which turbo mode is being verified | |
181 | * | |
182 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
183 | * conditions) for short duration of times to finish high throughput work | |
184 | * quickly. Running on them for longer times may overheat the chip. | |
185 | * | |
186 | * Return: true if opp is turbo opp, else false. | |
19445b25 BZ |
187 | */ |
188 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
189 | { | |
052c6f19 | 190 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
19445b25 BZ |
191 | pr_err("%s: Invalid parameters\n", __func__); |
192 | return false; | |
193 | } | |
194 | ||
052c6f19 | 195 | return opp->turbo; |
19445b25 BZ |
196 | } |
197 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
198 | ||
3ca9bb33 VK |
199 | /** |
200 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
201 | * @dev: device for which we do this operation | |
202 | * | |
203 | * Return: This function returns the max clock latency in nanoseconds. | |
3ca9bb33 VK |
204 | */ |
205 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
206 | { | |
2c2709dc | 207 | struct opp_table *opp_table; |
3ca9bb33 VK |
208 | unsigned long clock_latency_ns; |
209 | ||
2c2709dc VK |
210 | opp_table = _find_opp_table(dev); |
211 | if (IS_ERR(opp_table)) | |
5b650b38 VK |
212 | return 0; |
213 | ||
214 | clock_latency_ns = opp_table->clock_latency_ns_max; | |
215 | ||
216 | dev_pm_opp_put_opp_table(opp_table); | |
3ca9bb33 | 217 | |
3ca9bb33 VK |
218 | return clock_latency_ns; |
219 | } | |
220 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
221 | ||
655c9df9 VK |
222 | /** |
223 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
224 | * @dev: device for which we do this operation | |
225 | * | |
226 | * Return: This function returns the max voltage latency in nanoseconds. | |
655c9df9 VK |
227 | */ |
228 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
229 | { | |
2c2709dc | 230 | struct opp_table *opp_table; |
655c9df9 | 231 | struct dev_pm_opp *opp; |
478256bd | 232 | struct regulator *reg; |
655c9df9 | 233 | unsigned long latency_ns = 0; |
dfbe4678 VK |
234 | int ret, i, count; |
235 | struct { | |
236 | unsigned long min; | |
237 | unsigned long max; | |
238 | } *uV; | |
239 | ||
cdd3e614 VK |
240 | opp_table = _find_opp_table(dev); |
241 | if (IS_ERR(opp_table)) | |
242 | return 0; | |
243 | ||
dfbe4678 | 244 | /* Regulator may not be required for the device */ |
90e3577b | 245 | if (!opp_table->regulators) |
cdd3e614 | 246 | goto put_opp_table; |
dfbe4678 | 247 | |
90e3577b VK |
248 | count = opp_table->regulator_count; |
249 | ||
dfbe4678 VK |
250 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); |
251 | if (!uV) | |
478256bd | 252 | goto put_opp_table; |
655c9df9 | 253 | |
052c6f19 VK |
254 | mutex_lock(&opp_table->lock); |
255 | ||
dfbe4678 VK |
256 | for (i = 0; i < count; i++) { |
257 | uV[i].min = ~0; | |
258 | uV[i].max = 0; | |
655c9df9 | 259 | |
052c6f19 | 260 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
dfbe4678 VK |
261 | if (!opp->available) |
262 | continue; | |
263 | ||
264 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
265 | uV[i].min = opp->supplies[i].u_volt_min; | |
266 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
267 | uV[i].max = opp->supplies[i].u_volt_max; | |
268 | } | |
655c9df9 VK |
269 | } |
270 | ||
052c6f19 | 271 | mutex_unlock(&opp_table->lock); |
655c9df9 VK |
272 | |
273 | /* | |
2c2709dc | 274 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
275 | * isn't freed, while we are executing this routine. |
276 | */ | |
8cc31116 | 277 | for (i = 0; i < count; i++) { |
478256bd | 278 | reg = opp_table->regulators[i]; |
dfbe4678 VK |
279 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); |
280 | if (ret > 0) | |
281 | latency_ns += ret * 1000; | |
282 | } | |
283 | ||
dfbe4678 | 284 | kfree(uV); |
cdd3e614 VK |
285 | put_opp_table: |
286 | dev_pm_opp_put_opp_table(opp_table); | |
655c9df9 VK |
287 | |
288 | return latency_ns; | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
291 | ||
21743447 VK |
292 | /** |
293 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
294 | * nanoseconds | |
295 | * @dev: device for which we do this operation | |
296 | * | |
297 | * Return: This function returns the max transition latency, in nanoseconds, to | |
298 | * switch from one OPP to other. | |
21743447 VK |
299 | */ |
300 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
301 | { | |
302 | return dev_pm_opp_get_max_volt_latency(dev) + | |
303 | dev_pm_opp_get_max_clock_latency(dev); | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
306 | ||
4eafbd15 | 307 | /** |
3aa26a3b | 308 | * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz |
4eafbd15 BZ |
309 | * @dev: device for which we do this operation |
310 | * | |
3aa26a3b VK |
311 | * Return: This function returns the frequency of the OPP marked as suspend_opp |
312 | * if one is available, else returns 0; | |
4eafbd15 | 313 | */ |
3aa26a3b | 314 | unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) |
4eafbd15 | 315 | { |
2c2709dc | 316 | struct opp_table *opp_table; |
3aa26a3b | 317 | unsigned long freq = 0; |
4eafbd15 | 318 | |
2c2709dc | 319 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
320 | if (IS_ERR(opp_table)) |
321 | return 0; | |
3aa26a3b | 322 | |
5b650b38 VK |
323 | if (opp_table->suspend_opp && opp_table->suspend_opp->available) |
324 | freq = dev_pm_opp_get_freq(opp_table->suspend_opp); | |
325 | ||
326 | dev_pm_opp_put_opp_table(opp_table); | |
4eafbd15 | 327 | |
3aa26a3b | 328 | return freq; |
4eafbd15 | 329 | } |
3aa26a3b | 330 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); |
4eafbd15 | 331 | |
a1e8c136 VK |
332 | int _get_opp_count(struct opp_table *opp_table) |
333 | { | |
334 | struct dev_pm_opp *opp; | |
335 | int count = 0; | |
336 | ||
337 | mutex_lock(&opp_table->lock); | |
338 | ||
339 | list_for_each_entry(opp, &opp_table->opp_list, node) { | |
340 | if (opp->available) | |
341 | count++; | |
342 | } | |
343 | ||
344 | mutex_unlock(&opp_table->lock); | |
345 | ||
346 | return count; | |
347 | } | |
348 | ||
e1f60b29 | 349 | /** |
2c2709dc | 350 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
351 | * @dev: device for which we do this operation |
352 | * | |
984f16c8 | 353 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 | 354 | * else returns 0 if none or the corresponding error value. |
e1f60b29 | 355 | */ |
5d4879cd | 356 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 357 | { |
2c2709dc | 358 | struct opp_table *opp_table; |
a1e8c136 | 359 | int count; |
e1f60b29 | 360 | |
2c2709dc VK |
361 | opp_table = _find_opp_table(dev); |
362 | if (IS_ERR(opp_table)) { | |
363 | count = PTR_ERR(opp_table); | |
035ed072 | 364 | dev_dbg(dev, "%s: OPP table not found (%d)\n", |
b4718c02 | 365 | __func__, count); |
09f662f9 | 366 | return count; |
e1f60b29 NM |
367 | } |
368 | ||
a1e8c136 | 369 | count = _get_opp_count(opp_table); |
5b650b38 VK |
370 | dev_pm_opp_put_opp_table(opp_table); |
371 | ||
e1f60b29 NM |
372 | return count; |
373 | } | |
5d4879cd | 374 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
375 | |
376 | /** | |
5d4879cd | 377 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
378 | * @dev: device for which we do this operation |
379 | * @freq: frequency to search for | |
7ae49618 | 380 | * @available: true/false - match for available opp |
e1f60b29 | 381 | * |
2c2709dc | 382 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
383 | * matching opp if found, else returns ERR_PTR in case of error and should |
384 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
385 | * EINVAL: for bad pointer |
386 | * ERANGE: no match found for search | |
387 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
388 | * |
389 | * Note: available is a modifier for the search. if available=true, then the | |
390 | * match is for exact matching frequency and is available in the stored OPP | |
391 | * table. if false, the match is for exact frequency which is not available. | |
392 | * | |
393 | * This provides a mechanism to enable an opp which is not available currently | |
394 | * or the opposite as well. | |
395 | * | |
8a31d9d9 VK |
396 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
397 | * use. | |
e1f60b29 | 398 | */ |
47d43ba7 NM |
399 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
400 | unsigned long freq, | |
401 | bool available) | |
e1f60b29 | 402 | { |
2c2709dc | 403 | struct opp_table *opp_table; |
47d43ba7 | 404 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 405 | |
2c2709dc VK |
406 | opp_table = _find_opp_table(dev); |
407 | if (IS_ERR(opp_table)) { | |
408 | int r = PTR_ERR(opp_table); | |
409 | ||
410 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
411 | return ERR_PTR(r); |
412 | } | |
413 | ||
052c6f19 | 414 | mutex_lock(&opp_table->lock); |
5b650b38 | 415 | |
052c6f19 | 416 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
417 | if (temp_opp->available == available && |
418 | temp_opp->rate == freq) { | |
419 | opp = temp_opp; | |
8a31d9d9 VK |
420 | |
421 | /* Increment the reference count of OPP */ | |
422 | dev_pm_opp_get(opp); | |
e1f60b29 NM |
423 | break; |
424 | } | |
425 | } | |
426 | ||
052c6f19 | 427 | mutex_unlock(&opp_table->lock); |
5b650b38 | 428 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 429 | |
e1f60b29 NM |
430 | return opp; |
431 | } | |
5d4879cd | 432 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 433 | |
71419d84 NC |
434 | /** |
435 | * dev_pm_opp_find_level_exact() - search for an exact level | |
436 | * @dev: device for which we do this operation | |
437 | * @level: level to search for | |
438 | * | |
439 | * Return: Searches for exact match in the opp table and returns pointer to the | |
440 | * matching opp if found, else returns ERR_PTR in case of error and should | |
441 | * be handled using IS_ERR. Error return values can be: | |
442 | * EINVAL: for bad pointer | |
443 | * ERANGE: no match found for search | |
444 | * ENODEV: if device not found in list of registered devices | |
445 | * | |
446 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
447 | * use. | |
448 | */ | |
449 | struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev, | |
450 | unsigned int level) | |
451 | { | |
452 | struct opp_table *opp_table; | |
453 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
454 | ||
455 | opp_table = _find_opp_table(dev); | |
456 | if (IS_ERR(opp_table)) { | |
457 | int r = PTR_ERR(opp_table); | |
458 | ||
459 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
460 | return ERR_PTR(r); | |
461 | } | |
462 | ||
463 | mutex_lock(&opp_table->lock); | |
464 | ||
465 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
466 | if (temp_opp->level == level) { | |
467 | opp = temp_opp; | |
468 | ||
469 | /* Increment the reference count of OPP */ | |
470 | dev_pm_opp_get(opp); | |
471 | break; | |
472 | } | |
473 | } | |
474 | ||
475 | mutex_unlock(&opp_table->lock); | |
476 | dev_pm_opp_put_opp_table(opp_table); | |
477 | ||
478 | return opp; | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact); | |
481 | ||
8dd5cada DO |
482 | /** |
483 | * dev_pm_opp_find_level_ceil() - search for an rounded up level | |
484 | * @dev: device for which we do this operation | |
485 | * @level: level to search for | |
486 | * | |
487 | * Return: Searches for rounded up match in the opp table and returns pointer | |
488 | * to the matching opp if found, else returns ERR_PTR in case of error and | |
489 | * should be handled using IS_ERR. Error return values can be: | |
490 | * EINVAL: for bad pointer | |
491 | * ERANGE: no match found for search | |
492 | * ENODEV: if device not found in list of registered devices | |
493 | * | |
494 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
495 | * use. | |
496 | */ | |
497 | struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev, | |
498 | unsigned int *level) | |
499 | { | |
500 | struct opp_table *opp_table; | |
501 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
502 | ||
503 | opp_table = _find_opp_table(dev); | |
504 | if (IS_ERR(opp_table)) { | |
505 | int r = PTR_ERR(opp_table); | |
506 | ||
507 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
508 | return ERR_PTR(r); | |
509 | } | |
510 | ||
511 | mutex_lock(&opp_table->lock); | |
512 | ||
513 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
514 | if (temp_opp->available && temp_opp->level >= *level) { | |
515 | opp = temp_opp; | |
516 | *level = opp->level; | |
517 | ||
518 | /* Increment the reference count of OPP */ | |
519 | dev_pm_opp_get(opp); | |
520 | break; | |
521 | } | |
522 | } | |
523 | ||
524 | mutex_unlock(&opp_table->lock); | |
525 | dev_pm_opp_put_opp_table(opp_table); | |
526 | ||
527 | return opp; | |
528 | } | |
529 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil); | |
530 | ||
067b7ce0 JZ |
531 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
532 | unsigned long *freq) | |
533 | { | |
534 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
535 | ||
052c6f19 VK |
536 | mutex_lock(&opp_table->lock); |
537 | ||
538 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
539 | if (temp_opp->available && temp_opp->rate >= *freq) { |
540 | opp = temp_opp; | |
541 | *freq = opp->rate; | |
8a31d9d9 VK |
542 | |
543 | /* Increment the reference count of OPP */ | |
544 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
545 | break; |
546 | } | |
547 | } | |
548 | ||
052c6f19 VK |
549 | mutex_unlock(&opp_table->lock); |
550 | ||
067b7ce0 JZ |
551 | return opp; |
552 | } | |
553 | ||
e1f60b29 | 554 | /** |
5d4879cd | 555 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
556 | * @dev: device for which we do this operation |
557 | * @freq: Start frequency | |
558 | * | |
559 | * Search for the matching ceil *available* OPP from a starting freq | |
560 | * for a device. | |
561 | * | |
984f16c8 | 562 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
563 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
564 | * values can be: | |
565 | * EINVAL: for bad pointer | |
566 | * ERANGE: no match found for search | |
567 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 568 | * |
8a31d9d9 VK |
569 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
570 | * use. | |
e1f60b29 | 571 | */ |
47d43ba7 NM |
572 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
573 | unsigned long *freq) | |
e1f60b29 | 574 | { |
2c2709dc | 575 | struct opp_table *opp_table; |
8a31d9d9 | 576 | struct dev_pm_opp *opp; |
b02ded24 | 577 | |
e1f60b29 NM |
578 | if (!dev || !freq) { |
579 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
580 | return ERR_PTR(-EINVAL); | |
581 | } | |
582 | ||
2c2709dc | 583 | opp_table = _find_opp_table(dev); |
5b650b38 | 584 | if (IS_ERR(opp_table)) |
2c2709dc | 585 | return ERR_CAST(opp_table); |
5b650b38 | 586 | |
8a31d9d9 | 587 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 588 | |
5b650b38 | 589 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
590 | |
591 | return opp; | |
e1f60b29 | 592 | } |
5d4879cd | 593 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
594 | |
595 | /** | |
5d4879cd | 596 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
597 | * @dev: device for which we do this operation |
598 | * @freq: Start frequency | |
599 | * | |
600 | * Search for the matching floor *available* OPP from a starting freq | |
601 | * for a device. | |
602 | * | |
984f16c8 | 603 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
604 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
605 | * values can be: | |
606 | * EINVAL: for bad pointer | |
607 | * ERANGE: no match found for search | |
608 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 609 | * |
8a31d9d9 VK |
610 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
611 | * use. | |
e1f60b29 | 612 | */ |
47d43ba7 NM |
613 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
614 | unsigned long *freq) | |
e1f60b29 | 615 | { |
2c2709dc | 616 | struct opp_table *opp_table; |
47d43ba7 | 617 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
618 | |
619 | if (!dev || !freq) { | |
620 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
621 | return ERR_PTR(-EINVAL); | |
622 | } | |
623 | ||
2c2709dc | 624 | opp_table = _find_opp_table(dev); |
5b650b38 | 625 | if (IS_ERR(opp_table)) |
2c2709dc | 626 | return ERR_CAST(opp_table); |
5b650b38 | 627 | |
052c6f19 | 628 | mutex_lock(&opp_table->lock); |
e1f60b29 | 629 | |
052c6f19 | 630 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
631 | if (temp_opp->available) { |
632 | /* go to the next node, before choosing prev */ | |
633 | if (temp_opp->rate > *freq) | |
634 | break; | |
635 | else | |
636 | opp = temp_opp; | |
637 | } | |
638 | } | |
8a31d9d9 VK |
639 | |
640 | /* Increment the reference count of OPP */ | |
641 | if (!IS_ERR(opp)) | |
642 | dev_pm_opp_get(opp); | |
052c6f19 | 643 | mutex_unlock(&opp_table->lock); |
5b650b38 | 644 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 645 | |
e1f60b29 NM |
646 | if (!IS_ERR(opp)) |
647 | *freq = opp->rate; | |
648 | ||
649 | return opp; | |
650 | } | |
5d4879cd | 651 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 652 | |
2f36bde0 AC |
653 | /** |
654 | * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for | |
655 | * target voltage. | |
656 | * @dev: Device for which we do this operation. | |
657 | * @u_volt: Target voltage. | |
658 | * | |
659 | * Search for OPP with highest (ceil) frequency and has voltage <= u_volt. | |
660 | * | |
661 | * Return: matching *opp, else returns ERR_PTR in case of error which should be | |
662 | * handled using IS_ERR. | |
663 | * | |
664 | * Error return values can be: | |
665 | * EINVAL: bad parameters | |
666 | * | |
667 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
668 | * use. | |
669 | */ | |
670 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev, | |
671 | unsigned long u_volt) | |
672 | { | |
673 | struct opp_table *opp_table; | |
674 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
675 | ||
676 | if (!dev || !u_volt) { | |
677 | dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__, | |
678 | u_volt); | |
679 | return ERR_PTR(-EINVAL); | |
680 | } | |
681 | ||
682 | opp_table = _find_opp_table(dev); | |
683 | if (IS_ERR(opp_table)) | |
684 | return ERR_CAST(opp_table); | |
685 | ||
686 | mutex_lock(&opp_table->lock); | |
687 | ||
688 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
689 | if (temp_opp->available) { | |
690 | if (temp_opp->supplies[0].u_volt > u_volt) | |
691 | break; | |
692 | opp = temp_opp; | |
693 | } | |
694 | } | |
695 | ||
696 | /* Increment the reference count of OPP */ | |
697 | if (!IS_ERR(opp)) | |
698 | dev_pm_opp_get(opp); | |
699 | ||
700 | mutex_unlock(&opp_table->lock); | |
701 | dev_pm_opp_put_opp_table(opp_table); | |
702 | ||
703 | return opp; | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt); | |
706 | ||
6a0712f6 | 707 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 708 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
709 | { |
710 | int ret; | |
711 | ||
712 | /* Regulator not available for device */ | |
713 | if (IS_ERR(reg)) { | |
714 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
715 | PTR_ERR(reg)); | |
716 | return 0; | |
717 | } | |
718 | ||
ce31781a VK |
719 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
720 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 721 | |
ce31781a VK |
722 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
723 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
724 | if (ret) |
725 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
726 | __func__, supply->u_volt_min, supply->u_volt, |
727 | supply->u_volt_max, ret); | |
6a0712f6 VK |
728 | |
729 | return ret; | |
730 | } | |
731 | ||
285881b5 VK |
732 | static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk, |
733 | unsigned long freq) | |
94735585 VK |
734 | { |
735 | int ret; | |
736 | ||
35e74b2e VK |
737 | /* We may reach here for devices which don't change frequency */ |
738 | if (IS_ERR(clk)) | |
739 | return 0; | |
740 | ||
94735585 VK |
741 | ret = clk_set_rate(clk, freq); |
742 | if (ret) { | |
743 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
744 | ret); | |
745 | } | |
746 | ||
747 | return ret; | |
748 | } | |
749 | ||
8d45719c | 750 | static int _generic_set_opp_regulator(struct opp_table *opp_table, |
c74b32fa | 751 | struct device *dev, |
3f62670f | 752 | struct dev_pm_opp *opp, |
c74b32fa | 753 | unsigned long freq, |
3f62670f | 754 | int scaling_down) |
94735585 | 755 | { |
c74b32fa | 756 | struct regulator *reg = opp_table->regulators[0]; |
3f62670f | 757 | struct dev_pm_opp *old_opp = opp_table->current_opp; |
94735585 VK |
758 | int ret; |
759 | ||
760 | /* This function only supports single regulator per device */ | |
c74b32fa | 761 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
762 | dev_err(dev, "multiple regulators are not supported\n"); |
763 | return -EINVAL; | |
764 | } | |
765 | ||
766 | /* Scaling up? Scale voltage before frequency */ | |
3f62670f VK |
767 | if (!scaling_down) { |
768 | ret = _set_opp_voltage(dev, reg, opp->supplies); | |
94735585 VK |
769 | if (ret) |
770 | goto restore_voltage; | |
771 | } | |
772 | ||
773 | /* Change frequency */ | |
285881b5 | 774 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
94735585 VK |
775 | if (ret) |
776 | goto restore_voltage; | |
777 | ||
778 | /* Scaling down? Scale voltage after frequency */ | |
3f62670f VK |
779 | if (scaling_down) { |
780 | ret = _set_opp_voltage(dev, reg, opp->supplies); | |
94735585 VK |
781 | if (ret) |
782 | goto restore_freq; | |
783 | } | |
784 | ||
8d45719c KK |
785 | /* |
786 | * Enable the regulator after setting its voltages, otherwise it breaks | |
787 | * some boot-enabled regulators. | |
788 | */ | |
72f80ce4 | 789 | if (unlikely(!opp_table->enabled)) { |
8d45719c KK |
790 | ret = regulator_enable(reg); |
791 | if (ret < 0) | |
792 | dev_warn(dev, "Failed to enable regulator: %d", ret); | |
8d45719c KK |
793 | } |
794 | ||
94735585 VK |
795 | return 0; |
796 | ||
797 | restore_freq: | |
3f62670f | 798 | if (_generic_set_opp_clk_only(dev, opp_table->clk, old_opp->rate)) |
94735585 | 799 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
3f62670f | 800 | __func__, old_opp->rate); |
94735585 VK |
801 | restore_voltage: |
802 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
3f62670f | 803 | _set_opp_voltage(dev, reg, old_opp->supplies); |
94735585 VK |
804 | |
805 | return ret; | |
806 | } | |
807 | ||
b00e667a | 808 | static int _set_opp_bw(const struct opp_table *opp_table, |
240ae50e | 809 | struct dev_pm_opp *opp, struct device *dev) |
b00e667a VK |
810 | { |
811 | u32 avg, peak; | |
812 | int i, ret; | |
813 | ||
814 | if (!opp_table->paths) | |
815 | return 0; | |
816 | ||
817 | for (i = 0; i < opp_table->path_count; i++) { | |
240ae50e | 818 | if (!opp) { |
b00e667a VK |
819 | avg = 0; |
820 | peak = 0; | |
821 | } else { | |
822 | avg = opp->bandwidth[i].avg; | |
823 | peak = opp->bandwidth[i].peak; | |
824 | } | |
825 | ret = icc_set_bw(opp_table->paths[i], avg, peak); | |
826 | if (ret) { | |
827 | dev_err(dev, "Failed to %s bandwidth[%d]: %d\n", | |
240ae50e | 828 | opp ? "set" : "remove", i, ret); |
b00e667a VK |
829 | return ret; |
830 | } | |
831 | } | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
7e535993 | 836 | static int _set_opp_custom(const struct opp_table *opp_table, |
509e4777 VK |
837 | struct device *dev, struct dev_pm_opp *opp, |
838 | unsigned long freq) | |
7e535993 | 839 | { |
04b447df | 840 | struct dev_pm_set_opp_data *data = opp_table->set_opp_data; |
509e4777 | 841 | struct dev_pm_opp *old_opp = opp_table->current_opp; |
7e535993 VK |
842 | int size; |
843 | ||
04b447df DO |
844 | /* |
845 | * We support this only if dev_pm_opp_set_regulators() was called | |
846 | * earlier. | |
847 | */ | |
848 | if (opp_table->sod_supplies) { | |
509e4777 VK |
849 | size = sizeof(*old_opp->supplies) * opp_table->regulator_count; |
850 | memcpy(data->old_opp.supplies, old_opp->supplies, size); | |
851 | memcpy(data->new_opp.supplies, opp->supplies, size); | |
04b447df DO |
852 | data->regulator_count = opp_table->regulator_count; |
853 | } else { | |
854 | data->regulator_count = 0; | |
855 | } | |
856 | ||
7e535993 | 857 | data->regulators = opp_table->regulators; |
7e535993 VK |
858 | data->clk = opp_table->clk; |
859 | data->dev = dev; | |
509e4777 | 860 | data->old_opp.rate = old_opp->rate; |
7e535993 | 861 | data->new_opp.rate = freq; |
7e535993 VK |
862 | |
863 | return opp_table->set_opp(data); | |
864 | } | |
865 | ||
60cdeae0 SG |
866 | static int _set_required_opp(struct device *dev, struct device *pd_dev, |
867 | struct dev_pm_opp *opp, int i) | |
868 | { | |
869 | unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0; | |
870 | int ret; | |
871 | ||
872 | if (!pd_dev) | |
873 | return 0; | |
874 | ||
875 | ret = dev_pm_genpd_set_performance_state(pd_dev, pstate); | |
876 | if (ret) { | |
877 | dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", | |
878 | dev_name(pd_dev), pstate, ret); | |
879 | } | |
880 | ||
881 | return ret; | |
882 | } | |
883 | ||
ca1b5d77 VK |
884 | /* This is only called for PM domain for now */ |
885 | static int _set_required_opps(struct device *dev, | |
886 | struct opp_table *opp_table, | |
2c59138c | 887 | struct dev_pm_opp *opp, bool up) |
ca1b5d77 VK |
888 | { |
889 | struct opp_table **required_opp_tables = opp_table->required_opp_tables; | |
890 | struct device **genpd_virt_devs = opp_table->genpd_virt_devs; | |
ca1b5d77 VK |
891 | int i, ret = 0; |
892 | ||
893 | if (!required_opp_tables) | |
894 | return 0; | |
895 | ||
19526d09 MS |
896 | /* required-opps not fully initialized yet */ |
897 | if (lazy_linking_pending(opp_table)) | |
898 | return -EBUSY; | |
899 | ||
4fa82a87 HYW |
900 | /* |
901 | * We only support genpd's OPPs in the "required-opps" for now, as we | |
902 | * don't know much about other use cases. Error out if the required OPP | |
903 | * doesn't belong to a genpd. | |
904 | */ | |
905 | if (unlikely(!required_opp_tables[0]->is_genpd)) { | |
906 | dev_err(dev, "required-opps don't belong to a genpd\n"); | |
907 | return -ENOENT; | |
908 | } | |
909 | ||
ca1b5d77 | 910 | /* Single genpd case */ |
60cdeae0 SG |
911 | if (!genpd_virt_devs) |
912 | return _set_required_opp(dev, dev, opp, 0); | |
ca1b5d77 VK |
913 | |
914 | /* Multiple genpd case */ | |
915 | ||
916 | /* | |
917 | * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev | |
918 | * after it is freed from another thread. | |
919 | */ | |
920 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
921 | ||
2c59138c SG |
922 | /* Scaling up? Set required OPPs in normal order, else reverse */ |
923 | if (up) { | |
924 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
925 | ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i); | |
926 | if (ret) | |
927 | break; | |
928 | } | |
929 | } else { | |
930 | for (i = opp_table->required_opp_count - 1; i >= 0; i--) { | |
931 | ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i); | |
932 | if (ret) | |
933 | break; | |
ca1b5d77 VK |
934 | } |
935 | } | |
2c59138c | 936 | |
ca1b5d77 VK |
937 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
81c4d8a3 VK |
942 | static void _find_current_opp(struct device *dev, struct opp_table *opp_table) |
943 | { | |
944 | struct dev_pm_opp *opp = ERR_PTR(-ENODEV); | |
945 | unsigned long freq; | |
946 | ||
947 | if (!IS_ERR(opp_table->clk)) { | |
948 | freq = clk_get_rate(opp_table->clk); | |
949 | opp = _find_freq_ceil(opp_table, &freq); | |
950 | } | |
951 | ||
952 | /* | |
953 | * Unable to find the current OPP ? Pick the first from the list since | |
954 | * it is in ascending order, otherwise rest of the code will need to | |
955 | * make special checks to validate current_opp. | |
956 | */ | |
957 | if (IS_ERR(opp)) { | |
958 | mutex_lock(&opp_table->lock); | |
959 | opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node); | |
960 | dev_pm_opp_get(opp); | |
961 | mutex_unlock(&opp_table->lock); | |
962 | } | |
963 | ||
964 | opp_table->current_opp = opp; | |
965 | } | |
966 | ||
5ad58bba | 967 | static int _disable_opp_table(struct device *dev, struct opp_table *opp_table) |
f3364e17 VK |
968 | { |
969 | int ret; | |
970 | ||
971 | if (!opp_table->enabled) | |
972 | return 0; | |
973 | ||
974 | /* | |
975 | * Some drivers need to support cases where some platforms may | |
976 | * have OPP table for the device, while others don't and | |
977 | * opp_set_rate() just needs to behave like clk_set_rate(). | |
978 | */ | |
979 | if (!_get_opp_count(opp_table)) | |
980 | return 0; | |
981 | ||
240ae50e | 982 | ret = _set_opp_bw(opp_table, NULL, dev); |
f3364e17 VK |
983 | if (ret) |
984 | return ret; | |
985 | ||
986 | if (opp_table->regulators) | |
987 | regulator_disable(opp_table->regulators[0]); | |
988 | ||
2c59138c | 989 | ret = _set_required_opps(dev, opp_table, NULL, false); |
f3364e17 VK |
990 | |
991 | opp_table->enabled = false; | |
992 | return ret; | |
993 | } | |
994 | ||
386ba854 VK |
995 | static int _set_opp(struct device *dev, struct opp_table *opp_table, |
996 | struct dev_pm_opp *opp, unsigned long freq) | |
6a0712f6 | 997 | { |
386ba854 | 998 | struct dev_pm_opp *old_opp; |
f0b88fa4 | 999 | int scaling_down, ret; |
6a0712f6 | 1000 | |
386ba854 VK |
1001 | if (unlikely(!opp)) |
1002 | return _disable_opp_table(dev, opp_table); | |
aca48b61 | 1003 | |
81c4d8a3 VK |
1004 | /* Find the currently set OPP if we don't know already */ |
1005 | if (unlikely(!opp_table->current_opp)) | |
1006 | _find_current_opp(dev, opp_table); | |
6a0712f6 | 1007 | |
81c4d8a3 | 1008 | old_opp = opp_table->current_opp; |
81c4d8a3 VK |
1009 | |
1010 | /* Return early if nothing to do */ | |
de04241a JM |
1011 | if (old_opp == opp && opp_table->current_rate == freq && |
1012 | opp_table->enabled) { | |
81c4d8a3 | 1013 | dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__); |
386ba854 | 1014 | return 0; |
6a0712f6 VK |
1015 | } |
1016 | ||
f0b88fa4 | 1017 | dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n", |
de04241a JM |
1018 | __func__, opp_table->current_rate, freq, old_opp->level, |
1019 | opp->level, old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0, | |
f0b88fa4 VK |
1020 | opp->bandwidth ? opp->bandwidth[0].peak : 0); |
1021 | ||
1022 | scaling_down = _opp_compare_key(old_opp, opp); | |
1023 | if (scaling_down == -1) | |
1024 | scaling_down = 0; | |
dfbe4678 | 1025 | |
ca1b5d77 | 1026 | /* Scaling up? Configure required OPPs before frequency */ |
f0b88fa4 | 1027 | if (!scaling_down) { |
2c59138c | 1028 | ret = _set_required_opps(dev, opp_table, opp, true); |
870d5d96 VK |
1029 | if (ret) { |
1030 | dev_err(dev, "Failed to set required opps: %d\n", ret); | |
1031 | return ret; | |
1032 | } | |
1033 | ||
1034 | ret = _set_opp_bw(opp_table, opp, dev); | |
1035 | if (ret) { | |
1036 | dev_err(dev, "Failed to set bw: %d\n", ret); | |
386ba854 | 1037 | return ret; |
870d5d96 | 1038 | } |
ca1b5d77 VK |
1039 | } |
1040 | ||
7e535993 | 1041 | if (opp_table->set_opp) { |
509e4777 | 1042 | ret = _set_opp_custom(opp_table, dev, opp, freq); |
7e535993 | 1043 | } else if (opp_table->regulators) { |
3f62670f VK |
1044 | ret = _generic_set_opp_regulator(opp_table, dev, opp, freq, |
1045 | scaling_down); | |
c74b32fa | 1046 | } else { |
7e535993 | 1047 | /* Only frequency scaling */ |
1d3c42ca | 1048 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
ca1b5d77 | 1049 | } |
c74b32fa | 1050 | |
870d5d96 VK |
1051 | if (ret) |
1052 | return ret; | |
1053 | ||
ca1b5d77 | 1054 | /* Scaling down? Configure required OPPs after frequency */ |
870d5d96 VK |
1055 | if (scaling_down) { |
1056 | ret = _set_opp_bw(opp_table, opp, dev); | |
1057 | if (ret) { | |
1058 | dev_err(dev, "Failed to set bw: %d\n", ret); | |
1059 | return ret; | |
1060 | } | |
1061 | ||
2c59138c | 1062 | ret = _set_required_opps(dev, opp_table, opp, false); |
870d5d96 | 1063 | if (ret) { |
ca1b5d77 | 1064 | dev_err(dev, "Failed to set required opps: %d\n", ret); |
870d5d96 VK |
1065 | return ret; |
1066 | } | |
dfbe4678 VK |
1067 | } |
1068 | ||
870d5d96 VK |
1069 | opp_table->enabled = true; |
1070 | dev_pm_opp_put(old_opp); | |
81c4d8a3 | 1071 | |
870d5d96 VK |
1072 | /* Make sure current_opp doesn't get freed */ |
1073 | dev_pm_opp_get(opp); | |
1074 | opp_table->current_opp = opp; | |
de04241a | 1075 | opp_table->current_rate = freq; |
fe2af402 | 1076 | |
386ba854 VK |
1077 | return ret; |
1078 | } | |
1079 | ||
1080 | /** | |
1081 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
1082 | * @dev: device for which we do this operation | |
1083 | * @target_freq: frequency to achieve | |
1084 | * | |
1085 | * This configures the power-supplies to the levels specified by the OPP | |
1086 | * corresponding to the target_freq, and programs the clock to a value <= | |
1087 | * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax | |
1088 | * provided by the opp, should have already rounded to the target OPP's | |
1089 | * frequency. | |
1090 | */ | |
1091 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
1092 | { | |
1093 | struct opp_table *opp_table; | |
1094 | unsigned long freq = 0, temp_freq; | |
1095 | struct dev_pm_opp *opp = NULL; | |
1096 | int ret; | |
1097 | ||
1098 | opp_table = _find_opp_table(dev); | |
1099 | if (IS_ERR(opp_table)) { | |
1100 | dev_err(dev, "%s: device's opp table doesn't exist\n", __func__); | |
1101 | return PTR_ERR(opp_table); | |
1102 | } | |
1103 | ||
1104 | if (target_freq) { | |
1105 | /* | |
1106 | * For IO devices which require an OPP on some platforms/SoCs | |
1107 | * while just needing to scale the clock on some others | |
1108 | * we look for empty OPP tables with just a clock handle and | |
1109 | * scale only the clk. This makes dev_pm_opp_set_rate() | |
1110 | * equivalent to a clk_set_rate() | |
1111 | */ | |
1112 | if (!_get_opp_count(opp_table)) { | |
1113 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, target_freq); | |
1114 | goto put_opp_table; | |
1115 | } | |
1116 | ||
1117 | freq = clk_round_rate(opp_table->clk, target_freq); | |
1118 | if ((long)freq <= 0) | |
1119 | freq = target_freq; | |
1120 | ||
1121 | /* | |
1122 | * The clock driver may support finer resolution of the | |
1123 | * frequencies than the OPP table, don't update the frequency we | |
1124 | * pass to clk_set_rate() here. | |
1125 | */ | |
1126 | temp_freq = freq; | |
1127 | opp = _find_freq_ceil(opp_table, &temp_freq); | |
1128 | if (IS_ERR(opp)) { | |
1129 | ret = PTR_ERR(opp); | |
1130 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
1131 | __func__, freq, ret); | |
1132 | goto put_opp_table; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | ret = _set_opp(dev, opp_table, opp, freq); | |
1137 | ||
1138 | if (target_freq) | |
1139 | dev_pm_opp_put(opp); | |
052c6f19 | 1140 | put_opp_table: |
5b650b38 | 1141 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 1142 | return ret; |
6a0712f6 VK |
1143 | } |
1144 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
1145 | ||
abbe3483 VK |
1146 | /** |
1147 | * dev_pm_opp_set_opp() - Configure device for OPP | |
1148 | * @dev: device for which we do this operation | |
1149 | * @opp: OPP to set to | |
1150 | * | |
1151 | * This configures the device based on the properties of the OPP passed to this | |
1152 | * routine. | |
1153 | * | |
1154 | * Return: 0 on success, a negative error number otherwise. | |
1155 | */ | |
1156 | int dev_pm_opp_set_opp(struct device *dev, struct dev_pm_opp *opp) | |
1157 | { | |
1158 | struct opp_table *opp_table; | |
1159 | int ret; | |
1160 | ||
1161 | opp_table = _find_opp_table(dev); | |
1162 | if (IS_ERR(opp_table)) { | |
1163 | dev_err(dev, "%s: device opp doesn't exist\n", __func__); | |
1164 | return PTR_ERR(opp_table); | |
1165 | } | |
1166 | ||
1167 | ret = _set_opp(dev, opp_table, opp, opp ? opp->rate : 0); | |
1168 | dev_pm_opp_put_opp_table(opp_table); | |
1169 | ||
1170 | return ret; | |
1171 | } | |
1172 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_opp); | |
1173 | ||
2c2709dc | 1174 | /* OPP-dev Helpers */ |
2c2709dc VK |
1175 | static void _remove_opp_dev(struct opp_device *opp_dev, |
1176 | struct opp_table *opp_table) | |
06441658 | 1177 | { |
2c2709dc VK |
1178 | opp_debug_unregister(opp_dev, opp_table); |
1179 | list_del(&opp_dev->node); | |
052c6f19 | 1180 | kfree(opp_dev); |
06441658 VK |
1181 | } |
1182 | ||
ef43f01a VK |
1183 | struct opp_device *_add_opp_dev(const struct device *dev, |
1184 | struct opp_table *opp_table) | |
06441658 | 1185 | { |
2c2709dc | 1186 | struct opp_device *opp_dev; |
06441658 | 1187 | |
2c2709dc VK |
1188 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
1189 | if (!opp_dev) | |
06441658 VK |
1190 | return NULL; |
1191 | ||
2c2709dc VK |
1192 | /* Initialize opp-dev */ |
1193 | opp_dev->dev = dev; | |
3d255699 | 1194 | |
ef43f01a | 1195 | mutex_lock(&opp_table->lock); |
052c6f19 | 1196 | list_add(&opp_dev->node, &opp_table->dev_list); |
ef43f01a | 1197 | mutex_unlock(&opp_table->lock); |
06441658 | 1198 | |
2c2709dc | 1199 | /* Create debugfs entries for the opp_table */ |
a2dea4cb | 1200 | opp_debug_register(opp_dev, opp_table); |
283d55e6 VK |
1201 | |
1202 | return opp_dev; | |
1203 | } | |
1204 | ||
eb7c8743 | 1205 | static struct opp_table *_allocate_opp_table(struct device *dev, int index) |
07cce74a | 1206 | { |
2c2709dc VK |
1207 | struct opp_table *opp_table; |
1208 | struct opp_device *opp_dev; | |
d54974c2 | 1209 | int ret; |
07cce74a VK |
1210 | |
1211 | /* | |
2c2709dc | 1212 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
1213 | * device is needed to be added, we pay this penalty. |
1214 | */ | |
2c2709dc VK |
1215 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
1216 | if (!opp_table) | |
dd461cd9 | 1217 | return ERR_PTR(-ENOMEM); |
07cce74a | 1218 | |
3d255699 | 1219 | mutex_init(&opp_table->lock); |
4f018bc0 | 1220 | mutex_init(&opp_table->genpd_virt_dev_lock); |
2c2709dc | 1221 | INIT_LIST_HEAD(&opp_table->dev_list); |
7eba0c76 | 1222 | INIT_LIST_HEAD(&opp_table->lazy); |
06441658 | 1223 | |
46f48aca VK |
1224 | /* Mark regulator count uninitialized */ |
1225 | opp_table->regulator_count = -1; | |
1226 | ||
2c2709dc VK |
1227 | opp_dev = _add_opp_dev(dev, opp_table); |
1228 | if (!opp_dev) { | |
dd461cd9 SG |
1229 | ret = -ENOMEM; |
1230 | goto err; | |
06441658 VK |
1231 | } |
1232 | ||
eb7c8743 | 1233 | _of_init_opp_table(opp_table, dev, index); |
50f8cfbd | 1234 | |
6d3f922c GD |
1235 | /* Find interconnect path(s) for the device */ |
1236 | ret = dev_pm_opp_of_find_icc_paths(dev, opp_table); | |
dd461cd9 SG |
1237 | if (ret) { |
1238 | if (ret == -EPROBE_DEFER) | |
32439ac7 | 1239 | goto remove_opp_dev; |
dd461cd9 | 1240 | |
6d3f922c GD |
1241 | dev_warn(dev, "%s: Error finding interconnect paths: %d\n", |
1242 | __func__, ret); | |
dd461cd9 | 1243 | } |
6d3f922c | 1244 | |
052c6f19 | 1245 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 1246 | INIT_LIST_HEAD(&opp_table->opp_list); |
f067a982 | 1247 | kref_init(&opp_table->kref); |
07cce74a | 1248 | |
2c2709dc | 1249 | return opp_table; |
dd461cd9 | 1250 | |
976509bb QW |
1251 | remove_opp_dev: |
1252 | _remove_opp_dev(opp_dev, opp_table); | |
dd461cd9 SG |
1253 | err: |
1254 | kfree(opp_table); | |
1255 | return ERR_PTR(ret); | |
07cce74a VK |
1256 | } |
1257 | ||
f067a982 | 1258 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 1259 | { |
f067a982 VK |
1260 | kref_get(&opp_table->kref); |
1261 | } | |
1262 | ||
32439ac7 VK |
1263 | static struct opp_table *_update_opp_table_clk(struct device *dev, |
1264 | struct opp_table *opp_table, | |
1265 | bool getclk) | |
1266 | { | |
d4a4c7a4 VK |
1267 | int ret; |
1268 | ||
32439ac7 VK |
1269 | /* |
1270 | * Return early if we don't need to get clk or we have already tried it | |
1271 | * earlier. | |
1272 | */ | |
1273 | if (!getclk || IS_ERR(opp_table) || opp_table->clk) | |
1274 | return opp_table; | |
1275 | ||
1276 | /* Find clk for the device */ | |
1277 | opp_table->clk = clk_get(dev, NULL); | |
32439ac7 | 1278 | |
d4a4c7a4 VK |
1279 | ret = PTR_ERR_OR_ZERO(opp_table->clk); |
1280 | if (!ret) | |
1281 | return opp_table; | |
32439ac7 | 1282 | |
d4a4c7a4 | 1283 | if (ret == -ENOENT) { |
32439ac7 | 1284 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret); |
d4a4c7a4 | 1285 | return opp_table; |
32439ac7 VK |
1286 | } |
1287 | ||
d4a4c7a4 VK |
1288 | dev_pm_opp_put_opp_table(opp_table); |
1289 | dev_err_probe(dev, ret, "Couldn't find clock\n"); | |
1290 | ||
1291 | return ERR_PTR(ret); | |
32439ac7 VK |
1292 | } |
1293 | ||
27c09484 VK |
1294 | /* |
1295 | * We need to make sure that the OPP table for a device doesn't get added twice, | |
1296 | * if this routine gets called in parallel with the same device pointer. | |
1297 | * | |
1298 | * The simplest way to enforce that is to perform everything (find existing | |
1299 | * table and if not found, create a new one) under the opp_table_lock, so only | |
1300 | * one creator gets access to the same. But that expands the critical section | |
1301 | * under the lock and may end up causing circular dependencies with frameworks | |
1302 | * like debugfs, interconnect or clock framework as they may be direct or | |
1303 | * indirect users of OPP core. | |
1304 | * | |
1305 | * And for that reason we have to go for a bit tricky implementation here, which | |
1306 | * uses the opp_tables_busy flag to indicate if another creator is in the middle | |
1307 | * of adding an OPP table and others should wait for it to finish. | |
1308 | */ | |
32439ac7 VK |
1309 | struct opp_table *_add_opp_table_indexed(struct device *dev, int index, |
1310 | bool getclk) | |
f067a982 VK |
1311 | { |
1312 | struct opp_table *opp_table; | |
1313 | ||
27c09484 | 1314 | again: |
f067a982 VK |
1315 | mutex_lock(&opp_table_lock); |
1316 | ||
5b650b38 VK |
1317 | opp_table = _find_opp_table_unlocked(dev); |
1318 | if (!IS_ERR(opp_table)) | |
f067a982 | 1319 | goto unlock; |
f067a982 | 1320 | |
27c09484 VK |
1321 | /* |
1322 | * The opp_tables list or an OPP table's dev_list is getting updated by | |
1323 | * another user, wait for it to finish. | |
1324 | */ | |
1325 | if (unlikely(opp_tables_busy)) { | |
1326 | mutex_unlock(&opp_table_lock); | |
1327 | cpu_relax(); | |
1328 | goto again; | |
1329 | } | |
1330 | ||
1331 | opp_tables_busy = true; | |
283d55e6 | 1332 | opp_table = _managed_opp(dev, index); |
27c09484 VK |
1333 | |
1334 | /* Drop the lock to reduce the size of critical section */ | |
1335 | mutex_unlock(&opp_table_lock); | |
1336 | ||
283d55e6 | 1337 | if (opp_table) { |
ef43f01a | 1338 | if (!_add_opp_dev(dev, opp_table)) { |
283d55e6 | 1339 | dev_pm_opp_put_opp_table(opp_table); |
dd461cd9 | 1340 | opp_table = ERR_PTR(-ENOMEM); |
283d55e6 | 1341 | } |
27c09484 VK |
1342 | |
1343 | mutex_lock(&opp_table_lock); | |
1344 | } else { | |
1345 | opp_table = _allocate_opp_table(dev, index); | |
1346 | ||
1347 | mutex_lock(&opp_table_lock); | |
1348 | if (!IS_ERR(opp_table)) | |
1349 | list_add(&opp_table->node, &opp_tables); | |
283d55e6 VK |
1350 | } |
1351 | ||
27c09484 | 1352 | opp_tables_busy = false; |
f067a982 VK |
1353 | |
1354 | unlock: | |
1355 | mutex_unlock(&opp_table_lock); | |
1356 | ||
32439ac7 | 1357 | return _update_opp_table_clk(dev, opp_table, getclk); |
f067a982 | 1358 | } |
eb7c8743 | 1359 | |
32439ac7 | 1360 | static struct opp_table *_add_opp_table(struct device *dev, bool getclk) |
eb7c8743 | 1361 | { |
32439ac7 | 1362 | return _add_opp_table_indexed(dev, 0, getclk); |
eb7c8743 | 1363 | } |
f067a982 | 1364 | |
e77dcb0b | 1365 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) |
eb7c8743 | 1366 | { |
e77dcb0b | 1367 | return _find_opp_table(dev); |
eb7c8743 | 1368 | } |
e77dcb0b | 1369 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
eb7c8743 | 1370 | |
b83c1899 | 1371 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
1372 | { |
1373 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
cdd6ed90 | 1374 | struct opp_device *opp_dev, *temp; |
6d3f922c | 1375 | int i; |
b6160e26 | 1376 | |
e0df59de VK |
1377 | /* Drop the lock as soon as we can */ |
1378 | list_del(&opp_table->node); | |
1379 | mutex_unlock(&opp_table_lock); | |
1380 | ||
81c4d8a3 VK |
1381 | if (opp_table->current_opp) |
1382 | dev_pm_opp_put(opp_table->current_opp); | |
1383 | ||
5d6d106f VK |
1384 | _of_clear_opp_table(opp_table); |
1385 | ||
b6160e26 VK |
1386 | /* Release clk */ |
1387 | if (!IS_ERR(opp_table->clk)) | |
1388 | clk_put(opp_table->clk); | |
1389 | ||
6d3f922c GD |
1390 | if (opp_table->paths) { |
1391 | for (i = 0; i < opp_table->path_count; i++) | |
1392 | icc_put(opp_table->paths[i]); | |
1393 | kfree(opp_table->paths); | |
1394 | } | |
1395 | ||
cdd6ed90 | 1396 | WARN_ON(!list_empty(&opp_table->opp_list)); |
b6160e26 | 1397 | |
cdd6ed90 VK |
1398 | list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { |
1399 | /* | |
1400 | * The OPP table is getting removed, drop the performance state | |
1401 | * constraints. | |
1402 | */ | |
1403 | if (opp_table->genpd_performance_state) | |
1404 | dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); | |
b6160e26 | 1405 | |
cdd6ed90 VK |
1406 | _remove_opp_dev(opp_dev, opp_table); |
1407 | } | |
b6160e26 | 1408 | |
4f018bc0 | 1409 | mutex_destroy(&opp_table->genpd_virt_dev_lock); |
37a73ec0 | 1410 | mutex_destroy(&opp_table->lock); |
052c6f19 | 1411 | kfree(opp_table); |
f067a982 VK |
1412 | } |
1413 | ||
1414 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) | |
1415 | { | |
1416 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
1417 | &opp_table_lock); | |
1418 | } | |
1419 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
1420 | ||
8cd2f6e8 | 1421 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
1422 | { |
1423 | kfree(opp); | |
969fceb3 VK |
1424 | } |
1425 | ||
cf1fac94 | 1426 | static void _opp_kref_release(struct kref *kref) |
129eec55 | 1427 | { |
cf1fac94 VK |
1428 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); |
1429 | struct opp_table *opp_table = opp->opp_table; | |
1430 | ||
1431 | list_del(&opp->node); | |
1432 | mutex_unlock(&opp_table->lock); | |
1433 | ||
129eec55 VK |
1434 | /* |
1435 | * Notify the changes in the availability of the operable | |
1436 | * frequency/voltage list. | |
1437 | */ | |
052c6f19 | 1438 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
da544b61 | 1439 | _of_opp_free_required_opps(opp_table, opp); |
deaa5146 | 1440 | opp_debug_remove_one(opp); |
052c6f19 | 1441 | kfree(opp); |
1690d8bb | 1442 | } |
129eec55 | 1443 | |
a88bd2a5 | 1444 | void dev_pm_opp_get(struct dev_pm_opp *opp) |
8a31d9d9 VK |
1445 | { |
1446 | kref_get(&opp->kref); | |
1447 | } | |
1448 | ||
7034764a VK |
1449 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
1450 | { | |
cf1fac94 | 1451 | kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock); |
7034764a VK |
1452 | } |
1453 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
1454 | ||
129eec55 | 1455 | /** |
2c2709dc | 1456 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
1457 | * @dev: device for which we do this operation |
1458 | * @freq: OPP to remove with matching 'freq' | |
1459 | * | |
2c2709dc | 1460 | * This function removes an opp from the opp table. |
129eec55 VK |
1461 | */ |
1462 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
1463 | { | |
1464 | struct dev_pm_opp *opp; | |
2c2709dc | 1465 | struct opp_table *opp_table; |
129eec55 VK |
1466 | bool found = false; |
1467 | ||
2c2709dc VK |
1468 | opp_table = _find_opp_table(dev); |
1469 | if (IS_ERR(opp_table)) | |
5b650b38 | 1470 | return; |
129eec55 | 1471 | |
37a73ec0 VK |
1472 | mutex_lock(&opp_table->lock); |
1473 | ||
2c2709dc | 1474 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
1475 | if (opp->rate == freq) { |
1476 | found = true; | |
1477 | break; | |
1478 | } | |
1479 | } | |
1480 | ||
37a73ec0 VK |
1481 | mutex_unlock(&opp_table->lock); |
1482 | ||
5b650b38 VK |
1483 | if (found) { |
1484 | dev_pm_opp_put(opp); | |
0ad8c623 VK |
1485 | |
1486 | /* Drop the reference taken by dev_pm_opp_add() */ | |
1487 | dev_pm_opp_put_opp_table(opp_table); | |
5b650b38 | 1488 | } else { |
129eec55 VK |
1489 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
1490 | __func__, freq); | |
129eec55 VK |
1491 | } |
1492 | ||
0ad8c623 | 1493 | /* Drop the reference taken by _find_opp_table() */ |
5b650b38 | 1494 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
1495 | } |
1496 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1497 | ||
cf1fac94 VK |
1498 | static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table, |
1499 | bool dynamic) | |
1500 | { | |
1501 | struct dev_pm_opp *opp = NULL, *temp; | |
1502 | ||
1503 | mutex_lock(&opp_table->lock); | |
1504 | list_for_each_entry(temp, &opp_table->opp_list, node) { | |
606a5d42 BM |
1505 | /* |
1506 | * Refcount must be dropped only once for each OPP by OPP core, | |
1507 | * do that with help of "removed" flag. | |
1508 | */ | |
1509 | if (!temp->removed && dynamic == temp->dynamic) { | |
cf1fac94 VK |
1510 | opp = temp; |
1511 | break; | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | mutex_unlock(&opp_table->lock); | |
1516 | return opp; | |
1517 | } | |
1518 | ||
606a5d42 BM |
1519 | /* |
1520 | * Can't call dev_pm_opp_put() from under the lock as debugfs removal needs to | |
1521 | * happen lock less to avoid circular dependency issues. This routine must be | |
1522 | * called without the opp_table->lock held. | |
1523 | */ | |
1524 | static void _opp_remove_all(struct opp_table *opp_table, bool dynamic) | |
03758d60 | 1525 | { |
cf1fac94 | 1526 | struct dev_pm_opp *opp; |
03758d60 | 1527 | |
606a5d42 BM |
1528 | while ((opp = _opp_get_next(opp_table, dynamic))) { |
1529 | opp->removed = true; | |
1530 | dev_pm_opp_put(opp); | |
1531 | ||
1532 | /* Drop the references taken by dev_pm_opp_add() */ | |
1533 | if (dynamic) | |
1534 | dev_pm_opp_put_opp_table(opp_table); | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | bool _opp_remove_all_static(struct opp_table *opp_table) | |
1539 | { | |
03758d60 VK |
1540 | mutex_lock(&opp_table->lock); |
1541 | ||
922ff075 | 1542 | if (!opp_table->parsed_static_opps) { |
cf1fac94 VK |
1543 | mutex_unlock(&opp_table->lock); |
1544 | return false; | |
922ff075 VK |
1545 | } |
1546 | ||
cf1fac94 VK |
1547 | if (--opp_table->parsed_static_opps) { |
1548 | mutex_unlock(&opp_table->lock); | |
1549 | return true; | |
03758d60 VK |
1550 | } |
1551 | ||
03758d60 | 1552 | mutex_unlock(&opp_table->lock); |
922ff075 | 1553 | |
606a5d42 | 1554 | _opp_remove_all(opp_table, false); |
cf1fac94 | 1555 | return true; |
03758d60 VK |
1556 | } |
1557 | ||
1690d8bb VK |
1558 | /** |
1559 | * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs | |
1560 | * @dev: device for which we do this operation | |
1561 | * | |
1562 | * This function removes all dynamically created OPPs from the opp table. | |
1563 | */ | |
1564 | void dev_pm_opp_remove_all_dynamic(struct device *dev) | |
1565 | { | |
1566 | struct opp_table *opp_table; | |
1690d8bb VK |
1567 | |
1568 | opp_table = _find_opp_table(dev); | |
1569 | if (IS_ERR(opp_table)) | |
1570 | return; | |
1571 | ||
606a5d42 | 1572 | _opp_remove_all(opp_table, true); |
1690d8bb VK |
1573 | |
1574 | /* Drop the reference taken by _find_opp_table() */ | |
1575 | dev_pm_opp_put_opp_table(opp_table); | |
1576 | } | |
1577 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic); | |
1578 | ||
8cd2f6e8 | 1579 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 1580 | { |
23dacf6d | 1581 | struct dev_pm_opp *opp; |
6d3f922c | 1582 | int supply_count, supply_size, icc_size; |
e1f60b29 | 1583 | |
dfbe4678 | 1584 | /* Allocate space for at least one supply */ |
6d3f922c GD |
1585 | supply_count = table->regulator_count > 0 ? table->regulator_count : 1; |
1586 | supply_size = sizeof(*opp->supplies) * supply_count; | |
1587 | icc_size = sizeof(*opp->bandwidth) * table->path_count; | |
e1f60b29 | 1588 | |
dfbe4678 | 1589 | /* allocate new OPP node and supplies structures */ |
6d3f922c GD |
1590 | opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL); |
1591 | ||
8cd2f6e8 | 1592 | if (!opp) |
23dacf6d | 1593 | return NULL; |
23dacf6d | 1594 | |
dfbe4678 VK |
1595 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1596 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
6d3f922c GD |
1597 | if (icc_size) |
1598 | opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count); | |
dfbe4678 VK |
1599 | INIT_LIST_HEAD(&opp->node); |
1600 | ||
23dacf6d VK |
1601 | return opp; |
1602 | } | |
1603 | ||
7d34d56e | 1604 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1605 | struct opp_table *opp_table) |
7d34d56e | 1606 | { |
dfbe4678 VK |
1607 | struct regulator *reg; |
1608 | int i; | |
1609 | ||
90e3577b VK |
1610 | if (!opp_table->regulators) |
1611 | return true; | |
1612 | ||
dfbe4678 VK |
1613 | for (i = 0; i < opp_table->regulator_count; i++) { |
1614 | reg = opp_table->regulators[i]; | |
1615 | ||
1616 | if (!regulator_is_supported_voltage(reg, | |
1617 | opp->supplies[i].u_volt_min, | |
1618 | opp->supplies[i].u_volt_max)) { | |
1619 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1620 | __func__, opp->supplies[i].u_volt_min, | |
1621 | opp->supplies[i].u_volt_max); | |
1622 | return false; | |
1623 | } | |
7d34d56e VK |
1624 | } |
1625 | ||
1626 | return true; | |
1627 | } | |
1628 | ||
6c591eec SK |
1629 | int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2) |
1630 | { | |
1631 | if (opp1->rate != opp2->rate) | |
1632 | return opp1->rate < opp2->rate ? -1 : 1; | |
6d3f922c GD |
1633 | if (opp1->bandwidth && opp2->bandwidth && |
1634 | opp1->bandwidth[0].peak != opp2->bandwidth[0].peak) | |
1635 | return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1; | |
6c591eec SK |
1636 | if (opp1->level != opp2->level) |
1637 | return opp1->level < opp2->level ? -1 : 1; | |
1638 | return 0; | |
1639 | } | |
1640 | ||
a1e8c136 VK |
1641 | static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, |
1642 | struct opp_table *opp_table, | |
1643 | struct list_head **head) | |
23dacf6d VK |
1644 | { |
1645 | struct dev_pm_opp *opp; | |
6c591eec | 1646 | int opp_cmp; |
23dacf6d VK |
1647 | |
1648 | /* | |
1649 | * Insert new OPP in order of increasing frequency and discard if | |
1650 | * already present. | |
1651 | * | |
2c2709dc | 1652 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1653 | * loop, don't replace it with head otherwise it will become an infinite |
1654 | * loop. | |
1655 | */ | |
052c6f19 | 1656 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
6c591eec SK |
1657 | opp_cmp = _opp_compare_key(new_opp, opp); |
1658 | if (opp_cmp > 0) { | |
a1e8c136 | 1659 | *head = &opp->node; |
23dacf6d VK |
1660 | continue; |
1661 | } | |
1662 | ||
6c591eec | 1663 | if (opp_cmp < 0) |
a1e8c136 | 1664 | return 0; |
23dacf6d VK |
1665 | |
1666 | /* Duplicate OPPs */ | |
06441658 | 1667 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1668 | __func__, opp->rate, opp->supplies[0].u_volt, |
1669 | opp->available, new_opp->rate, | |
1670 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1671 | |
dfbe4678 | 1672 | /* Should we compare voltages for all regulators here ? */ |
a1e8c136 VK |
1673 | return opp->available && |
1674 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
1675 | } | |
1676 | ||
1677 | return 0; | |
1678 | } | |
1679 | ||
7eba0c76 VK |
1680 | void _required_opps_available(struct dev_pm_opp *opp, int count) |
1681 | { | |
1682 | int i; | |
1683 | ||
1684 | for (i = 0; i < count; i++) { | |
1685 | if (opp->required_opps[i]->available) | |
1686 | continue; | |
1687 | ||
1688 | opp->available = false; | |
1689 | pr_warn("%s: OPP not supported by required OPP %pOF (%lu)\n", | |
1690 | __func__, opp->required_opps[i]->np, opp->rate); | |
1691 | return; | |
1692 | } | |
1693 | } | |
1694 | ||
a1e8c136 VK |
1695 | /* |
1696 | * Returns: | |
1697 | * 0: On success. And appropriate error message for duplicate OPPs. | |
1698 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
1699 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
1700 | * sure we don't print error messages unnecessarily if different parts of | |
1701 | * kernel try to initialize the OPP table. | |
1702 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
1703 | * should be considered an error by the callers of _opp_add(). | |
1704 | */ | |
1705 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, | |
1706 | struct opp_table *opp_table, bool rate_not_available) | |
1707 | { | |
1708 | struct list_head *head; | |
1709 | int ret; | |
1710 | ||
1711 | mutex_lock(&opp_table->lock); | |
1712 | head = &opp_table->opp_list; | |
37a73ec0 | 1713 | |
32715be4 DO |
1714 | ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); |
1715 | if (ret) { | |
1716 | mutex_unlock(&opp_table->lock); | |
1717 | return ret; | |
23dacf6d VK |
1718 | } |
1719 | ||
052c6f19 | 1720 | list_add(&new_opp->node, head); |
37a73ec0 VK |
1721 | mutex_unlock(&opp_table->lock); |
1722 | ||
1723 | new_opp->opp_table = opp_table; | |
7034764a | 1724 | kref_init(&new_opp->kref); |
23dacf6d | 1725 | |
a2dea4cb | 1726 | opp_debug_create_one(new_opp, opp_table); |
deaa5146 | 1727 | |
2c2709dc | 1728 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1729 | new_opp->available = false; |
1730 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1731 | __func__, new_opp->rate); | |
1732 | } | |
1733 | ||
7eba0c76 VK |
1734 | /* required-opps not fully initialized yet */ |
1735 | if (lazy_linking_pending(opp_table)) | |
1736 | return 0; | |
cf65948d | 1737 | |
7eba0c76 | 1738 | _required_opps_available(new_opp, opp_table->required_opp_count); |
cf65948d | 1739 | |
23dacf6d VK |
1740 | return 0; |
1741 | } | |
1742 | ||
984f16c8 | 1743 | /** |
b64b9c3f | 1744 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1745 | * @opp_table: OPP table |
984f16c8 NM |
1746 | * @dev: device for which we do this operation |
1747 | * @freq: Frequency in Hz for this OPP | |
1748 | * @u_volt: Voltage in uVolts for this OPP | |
1749 | * @dynamic: Dynamically added OPPs. | |
1750 | * | |
2c2709dc | 1751 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1752 | * The opp is made available by default and it can be controlled using |
1753 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1754 | * | |
8f8d37b2 VK |
1755 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1756 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1757 | * |
984f16c8 NM |
1758 | * Return: |
1759 | * 0 On success OR | |
1760 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1761 | * -EEXIST Freq are same and volt are different OR | |
1762 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1763 | * -ENOMEM Memory allocation failure | |
1764 | */ | |
8cd2f6e8 VK |
1765 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1766 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1767 | { |
23dacf6d | 1768 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1769 | unsigned long tol; |
6ce4184d | 1770 | int ret; |
e1f60b29 | 1771 | |
8cd2f6e8 VK |
1772 | new_opp = _opp_allocate(opp_table); |
1773 | if (!new_opp) | |
1774 | return -ENOMEM; | |
23dacf6d | 1775 | |
a7470db6 | 1776 | /* populate the opp table */ |
a7470db6 | 1777 | new_opp->rate = freq; |
2c2709dc | 1778 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1779 | new_opp->supplies[0].u_volt = u_volt; |
1780 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1781 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1782 | new_opp->available = true; |
23dacf6d | 1783 | new_opp->dynamic = dynamic; |
a7470db6 | 1784 | |
a1e8c136 | 1785 | ret = _opp_add(dev, new_opp, opp_table, false); |
7f8538eb VK |
1786 | if (ret) { |
1787 | /* Don't return error for duplicate OPPs */ | |
1788 | if (ret == -EBUSY) | |
1789 | ret = 0; | |
6ce4184d | 1790 | goto free_opp; |
7f8538eb | 1791 | } |
64ce8545 | 1792 | |
03ca370f MH |
1793 | /* |
1794 | * Notify the changes in the availability of the operable | |
1795 | * frequency/voltage list. | |
1796 | */ | |
052c6f19 | 1797 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1798 | return 0; |
6ce4184d VK |
1799 | |
1800 | free_opp: | |
8cd2f6e8 VK |
1801 | _opp_free(new_opp); |
1802 | ||
6ce4184d | 1803 | return ret; |
e1f60b29 | 1804 | } |
38393409 | 1805 | |
7de36b0a VK |
1806 | /** |
1807 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1808 | * @dev: Device for which supported-hw has to be set. | |
1809 | * @versions: Array of hierarchy of versions to match. | |
1810 | * @count: Number of elements in the array. | |
1811 | * | |
1812 | * This is required only for the V2 bindings, and it enables a platform to | |
1813 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1814 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1815 | * property. | |
7de36b0a | 1816 | */ |
fa30184d VK |
1817 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1818 | const u32 *versions, unsigned int count) | |
7de36b0a | 1819 | { |
2c2709dc | 1820 | struct opp_table *opp_table; |
7de36b0a | 1821 | |
32439ac7 | 1822 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
1823 | if (IS_ERR(opp_table)) |
1824 | return opp_table; | |
7de36b0a | 1825 | |
2c2709dc VK |
1826 | /* Make sure there are no concurrent readers while updating opp_table */ |
1827 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1828 | |
25419de1 VK |
1829 | /* Another CPU that shares the OPP table has set the property ? */ |
1830 | if (opp_table->supported_hw) | |
1831 | return opp_table; | |
7de36b0a | 1832 | |
2c2709dc | 1833 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1834 | GFP_KERNEL); |
2c2709dc | 1835 | if (!opp_table->supported_hw) { |
25419de1 VK |
1836 | dev_pm_opp_put_opp_table(opp_table); |
1837 | return ERR_PTR(-ENOMEM); | |
7de36b0a VK |
1838 | } |
1839 | ||
2c2709dc | 1840 | opp_table->supported_hw_count = count; |
fa30184d VK |
1841 | |
1842 | return opp_table; | |
7de36b0a VK |
1843 | } |
1844 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1845 | ||
1846 | /** | |
1847 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1848 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1849 | * |
1850 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1851 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1852 | * will not be freed. |
7de36b0a | 1853 | */ |
fa30184d | 1854 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1855 | { |
c7bf8758 VK |
1856 | if (unlikely(!opp_table)) |
1857 | return; | |
1858 | ||
2c2709dc VK |
1859 | kfree(opp_table->supported_hw); |
1860 | opp_table->supported_hw = NULL; | |
1861 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1862 | |
fa30184d | 1863 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1864 | } |
1865 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1866 | ||
9c4f220f YL |
1867 | static void devm_pm_opp_supported_hw_release(void *data) |
1868 | { | |
1869 | dev_pm_opp_put_supported_hw(data); | |
1870 | } | |
1871 | ||
1872 | /** | |
1873 | * devm_pm_opp_set_supported_hw() - Set supported platforms | |
1874 | * @dev: Device for which supported-hw has to be set. | |
1875 | * @versions: Array of hierarchy of versions to match. | |
1876 | * @count: Number of elements in the array. | |
1877 | * | |
1878 | * This is a resource-managed variant of dev_pm_opp_set_supported_hw(). | |
1879 | * | |
1880 | * Return: 0 on success and errorno otherwise. | |
1881 | */ | |
1882 | int devm_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, | |
1883 | unsigned int count) | |
1884 | { | |
1885 | struct opp_table *opp_table; | |
1886 | ||
1887 | opp_table = dev_pm_opp_set_supported_hw(dev, versions, count); | |
1888 | if (IS_ERR(opp_table)) | |
1889 | return PTR_ERR(opp_table); | |
1890 | ||
1891 | return devm_add_action_or_reset(dev, devm_pm_opp_supported_hw_release, | |
1892 | opp_table); | |
1893 | } | |
1894 | EXPORT_SYMBOL_GPL(devm_pm_opp_set_supported_hw); | |
1895 | ||
01fb4d3c VK |
1896 | /** |
1897 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1898 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1899 | * @name: name to postfix to properties. |
1900 | * | |
1901 | * This is required only for the V2 bindings, and it enables a platform to | |
1902 | * specify the extn to be used for certain property names. The properties to | |
1903 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1904 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1905 | */ |
fa30184d | 1906 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1907 | { |
2c2709dc | 1908 | struct opp_table *opp_table; |
01fb4d3c | 1909 | |
32439ac7 | 1910 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
1911 | if (IS_ERR(opp_table)) |
1912 | return opp_table; | |
01fb4d3c | 1913 | |
2c2709dc VK |
1914 | /* Make sure there are no concurrent readers while updating opp_table */ |
1915 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1916 | |
878ec1a9 VK |
1917 | /* Another CPU that shares the OPP table has set the property ? */ |
1918 | if (opp_table->prop_name) | |
1919 | return opp_table; | |
01fb4d3c | 1920 | |
2c2709dc VK |
1921 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1922 | if (!opp_table->prop_name) { | |
878ec1a9 VK |
1923 | dev_pm_opp_put_opp_table(opp_table); |
1924 | return ERR_PTR(-ENOMEM); | |
01fb4d3c VK |
1925 | } |
1926 | ||
fa30184d | 1927 | return opp_table; |
01fb4d3c VK |
1928 | } |
1929 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1930 | ||
1931 | /** | |
1932 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1933 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1934 | * |
1935 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1936 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1937 | * will not be freed. |
01fb4d3c | 1938 | */ |
fa30184d | 1939 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1940 | { |
c7bf8758 VK |
1941 | if (unlikely(!opp_table)) |
1942 | return; | |
1943 | ||
2c2709dc VK |
1944 | kfree(opp_table->prop_name); |
1945 | opp_table->prop_name = NULL; | |
01fb4d3c | 1946 | |
fa30184d | 1947 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1948 | } |
1949 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1950 | ||
9f8ea969 | 1951 | /** |
dfbe4678 | 1952 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1953 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1954 | * @names: Array of pointers to the names of the regulator. |
1955 | * @count: Number of regulators. | |
9f8ea969 VK |
1956 | * |
1957 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1958 | * device's regulators, as the core would be required to switch voltages as |
1959 | * well. | |
9f8ea969 VK |
1960 | * |
1961 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1962 | */ |
dfbe4678 VK |
1963 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1964 | const char * const names[], | |
1965 | unsigned int count) | |
9f8ea969 | 1966 | { |
38bb3439 | 1967 | struct dev_pm_opp_supply *supplies; |
2c2709dc | 1968 | struct opp_table *opp_table; |
9f8ea969 | 1969 | struct regulator *reg; |
dfbe4678 | 1970 | int ret, i; |
9f8ea969 | 1971 | |
32439ac7 | 1972 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
1973 | if (IS_ERR(opp_table)) |
1974 | return opp_table; | |
9f8ea969 VK |
1975 | |
1976 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1977 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1978 | ret = -EBUSY; |
1979 | goto err; | |
1980 | } | |
1981 | ||
779b783c VK |
1982 | /* Another CPU that shares the OPP table has set the regulators ? */ |
1983 | if (opp_table->regulators) | |
1984 | return opp_table; | |
dfbe4678 VK |
1985 | |
1986 | opp_table->regulators = kmalloc_array(count, | |
1987 | sizeof(*opp_table->regulators), | |
1988 | GFP_KERNEL); | |
1989 | if (!opp_table->regulators) { | |
1990 | ret = -ENOMEM; | |
9f8ea969 VK |
1991 | goto err; |
1992 | } | |
1993 | ||
dfbe4678 VK |
1994 | for (i = 0; i < count; i++) { |
1995 | reg = regulator_get_optional(dev, names[i]); | |
1996 | if (IS_ERR(reg)) { | |
1997 | ret = PTR_ERR(reg); | |
1998 | if (ret != -EPROBE_DEFER) | |
1999 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
2000 | __func__, names[i], ret); | |
2001 | goto free_regulators; | |
2002 | } | |
2003 | ||
2004 | opp_table->regulators[i] = reg; | |
2005 | } | |
2006 | ||
2007 | opp_table->regulator_count = count; | |
9f8ea969 | 2008 | |
38bb3439 VK |
2009 | supplies = kmalloc_array(count * 2, sizeof(*supplies), GFP_KERNEL); |
2010 | if (!supplies) { | |
2011 | ret = -ENOMEM; | |
94735585 | 2012 | goto free_regulators; |
38bb3439 VK |
2013 | } |
2014 | ||
2015 | mutex_lock(&opp_table->lock); | |
2016 | opp_table->sod_supplies = supplies; | |
2017 | if (opp_table->set_opp_data) { | |
2018 | opp_table->set_opp_data->old_opp.supplies = supplies; | |
2019 | opp_table->set_opp_data->new_opp.supplies = supplies + count; | |
2020 | } | |
2021 | mutex_unlock(&opp_table->lock); | |
94735585 | 2022 | |
91291d9a | 2023 | return opp_table; |
9f8ea969 | 2024 | |
dfbe4678 | 2025 | free_regulators: |
24957db1 MS |
2026 | while (i != 0) |
2027 | regulator_put(opp_table->regulators[--i]); | |
dfbe4678 VK |
2028 | |
2029 | kfree(opp_table->regulators); | |
2030 | opp_table->regulators = NULL; | |
46f48aca | 2031 | opp_table->regulator_count = -1; |
9f8ea969 | 2032 | err: |
fa30184d | 2033 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 2034 | |
91291d9a | 2035 | return ERR_PTR(ret); |
9f8ea969 | 2036 | } |
dfbe4678 | 2037 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
2038 | |
2039 | /** | |
dfbe4678 VK |
2040 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
2041 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 2042 | */ |
dfbe4678 | 2043 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 2044 | { |
dfbe4678 VK |
2045 | int i; |
2046 | ||
c7bf8758 VK |
2047 | if (unlikely(!opp_table)) |
2048 | return; | |
2049 | ||
779b783c VK |
2050 | if (!opp_table->regulators) |
2051 | goto put_opp_table; | |
9f8ea969 | 2052 | |
72f80ce4 | 2053 | if (opp_table->enabled) { |
8d45719c KK |
2054 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
2055 | regulator_disable(opp_table->regulators[i]); | |
8d45719c KK |
2056 | } |
2057 | ||
24957db1 | 2058 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
dfbe4678 VK |
2059 | regulator_put(opp_table->regulators[i]); |
2060 | ||
38bb3439 VK |
2061 | mutex_lock(&opp_table->lock); |
2062 | if (opp_table->set_opp_data) { | |
2063 | opp_table->set_opp_data->old_opp.supplies = NULL; | |
2064 | opp_table->set_opp_data->new_opp.supplies = NULL; | |
2065 | } | |
2066 | ||
2067 | kfree(opp_table->sod_supplies); | |
2068 | opp_table->sod_supplies = NULL; | |
2069 | mutex_unlock(&opp_table->lock); | |
94735585 | 2070 | |
dfbe4678 VK |
2071 | kfree(opp_table->regulators); |
2072 | opp_table->regulators = NULL; | |
46f48aca | 2073 | opp_table->regulator_count = -1; |
9f8ea969 | 2074 | |
779b783c | 2075 | put_opp_table: |
fa30184d | 2076 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 2077 | } |
dfbe4678 | 2078 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 2079 | |
32aee78b YL |
2080 | static void devm_pm_opp_regulators_release(void *data) |
2081 | { | |
2082 | dev_pm_opp_put_regulators(data); | |
2083 | } | |
2084 | ||
2085 | /** | |
2086 | * devm_pm_opp_set_regulators() - Set regulator names for the device | |
2087 | * @dev: Device for which regulator name is being set. | |
2088 | * @names: Array of pointers to the names of the regulator. | |
2089 | * @count: Number of regulators. | |
2090 | * | |
2091 | * This is a resource-managed variant of dev_pm_opp_set_regulators(). | |
2092 | * | |
2093 | * Return: 0 on success and errorno otherwise. | |
2094 | */ | |
2095 | int devm_pm_opp_set_regulators(struct device *dev, | |
2096 | const char * const names[], | |
2097 | unsigned int count) | |
2098 | { | |
2099 | struct opp_table *opp_table; | |
2100 | ||
2101 | opp_table = dev_pm_opp_set_regulators(dev, names, count); | |
2102 | if (IS_ERR(opp_table)) | |
2103 | return PTR_ERR(opp_table); | |
2104 | ||
2105 | return devm_add_action_or_reset(dev, devm_pm_opp_regulators_release, | |
2106 | opp_table); | |
2107 | } | |
2108 | EXPORT_SYMBOL_GPL(devm_pm_opp_set_regulators); | |
2109 | ||
829a4e8c VK |
2110 | /** |
2111 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
2112 | * @dev: Device for which clk name is being set. | |
2113 | * @name: Clk name. | |
2114 | * | |
2115 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
2116 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
2117 | * by passing connection-id as NULL), but for a device with multiple clocks | |
2118 | * available, the OPP core needs to know the exact name of the clk to use. | |
2119 | * | |
2120 | * This must be called before any OPPs are initialized for the device. | |
2121 | */ | |
2122 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
2123 | { | |
2124 | struct opp_table *opp_table; | |
2125 | int ret; | |
2126 | ||
32439ac7 | 2127 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
2128 | if (IS_ERR(opp_table)) |
2129 | return opp_table; | |
829a4e8c VK |
2130 | |
2131 | /* This should be called before OPPs are initialized */ | |
2132 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
2133 | ret = -EBUSY; | |
2134 | goto err; | |
2135 | } | |
2136 | ||
32439ac7 VK |
2137 | /* clk shouldn't be initialized at this point */ |
2138 | if (WARN_ON(opp_table->clk)) { | |
2139 | ret = -EBUSY; | |
2140 | goto err; | |
2141 | } | |
829a4e8c VK |
2142 | |
2143 | /* Find clk for the device */ | |
2144 | opp_table->clk = clk_get(dev, name); | |
2145 | if (IS_ERR(opp_table->clk)) { | |
2146 | ret = PTR_ERR(opp_table->clk); | |
2147 | if (ret != -EPROBE_DEFER) { | |
2148 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
2149 | ret); | |
2150 | } | |
2151 | goto err; | |
2152 | } | |
2153 | ||
2154 | return opp_table; | |
2155 | ||
2156 | err: | |
2157 | dev_pm_opp_put_opp_table(opp_table); | |
2158 | ||
2159 | return ERR_PTR(ret); | |
2160 | } | |
2161 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
2162 | ||
2163 | /** | |
2164 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
2165 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
2166 | */ | |
2167 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
2168 | { | |
c7bf8758 VK |
2169 | if (unlikely(!opp_table)) |
2170 | return; | |
2171 | ||
829a4e8c VK |
2172 | clk_put(opp_table->clk); |
2173 | opp_table->clk = ERR_PTR(-EINVAL); | |
2174 | ||
2175 | dev_pm_opp_put_opp_table(opp_table); | |
2176 | } | |
2177 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
2178 | ||
a74f681c YL |
2179 | static void devm_pm_opp_clkname_release(void *data) |
2180 | { | |
2181 | dev_pm_opp_put_clkname(data); | |
2182 | } | |
2183 | ||
2184 | /** | |
2185 | * devm_pm_opp_set_clkname() - Set clk name for the device | |
2186 | * @dev: Device for which clk name is being set. | |
2187 | * @name: Clk name. | |
2188 | * | |
2189 | * This is a resource-managed variant of dev_pm_opp_set_clkname(). | |
2190 | * | |
2191 | * Return: 0 on success and errorno otherwise. | |
2192 | */ | |
2193 | int devm_pm_opp_set_clkname(struct device *dev, const char *name) | |
2194 | { | |
2195 | struct opp_table *opp_table; | |
2196 | ||
2197 | opp_table = dev_pm_opp_set_clkname(dev, name); | |
2198 | if (IS_ERR(opp_table)) | |
2199 | return PTR_ERR(opp_table); | |
2200 | ||
2201 | return devm_add_action_or_reset(dev, devm_pm_opp_clkname_release, | |
2202 | opp_table); | |
2203 | } | |
2204 | EXPORT_SYMBOL_GPL(devm_pm_opp_set_clkname); | |
2205 | ||
4dab160e VK |
2206 | /** |
2207 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
2208 | * @dev: Device for which the helper is getting registered. | |
2209 | * @set_opp: Custom set OPP helper. | |
2210 | * | |
2211 | * This is useful to support complex platforms (like platforms with multiple | |
2212 | * regulators per device), instead of the generic OPP set rate helper. | |
2213 | * | |
2214 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 2215 | */ |
fa30184d | 2216 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
2217 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
2218 | { | |
38bb3439 | 2219 | struct dev_pm_set_opp_data *data; |
4dab160e | 2220 | struct opp_table *opp_table; |
4dab160e VK |
2221 | |
2222 | if (!set_opp) | |
fa30184d | 2223 | return ERR_PTR(-EINVAL); |
4dab160e | 2224 | |
32439ac7 | 2225 | opp_table = _add_opp_table(dev, false); |
47efcbcb | 2226 | if (IS_ERR(opp_table)) |
dd461cd9 | 2227 | return opp_table; |
4dab160e VK |
2228 | |
2229 | /* This should be called before OPPs are initialized */ | |
2230 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
5019acc6 VK |
2231 | dev_pm_opp_put_opp_table(opp_table); |
2232 | return ERR_PTR(-EBUSY); | |
4dab160e VK |
2233 | } |
2234 | ||
5019acc6 | 2235 | /* Another CPU that shares the OPP table has set the helper ? */ |
38bb3439 VK |
2236 | if (opp_table->set_opp) |
2237 | return opp_table; | |
2238 | ||
2239 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2240 | if (!data) | |
2241 | return ERR_PTR(-ENOMEM); | |
2242 | ||
2243 | mutex_lock(&opp_table->lock); | |
2244 | opp_table->set_opp_data = data; | |
2245 | if (opp_table->sod_supplies) { | |
2246 | data->old_opp.supplies = opp_table->sod_supplies; | |
2247 | data->new_opp.supplies = opp_table->sod_supplies + | |
2248 | opp_table->regulator_count; | |
2249 | } | |
2250 | mutex_unlock(&opp_table->lock); | |
2251 | ||
2252 | opp_table->set_opp = set_opp; | |
4dab160e | 2253 | |
fa30184d | 2254 | return opp_table; |
4dab160e VK |
2255 | } |
2256 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
2257 | ||
2258 | /** | |
604a7aeb | 2259 | * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for |
4dab160e | 2260 | * set_opp helper |
fa30184d | 2261 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 2262 | * |
fa30184d | 2263 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 2264 | */ |
604a7aeb | 2265 | void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) |
4dab160e | 2266 | { |
c7bf8758 VK |
2267 | if (unlikely(!opp_table)) |
2268 | return; | |
2269 | ||
4dab160e | 2270 | opp_table->set_opp = NULL; |
38bb3439 VK |
2271 | |
2272 | mutex_lock(&opp_table->lock); | |
2273 | kfree(opp_table->set_opp_data); | |
2274 | opp_table->set_opp_data = NULL; | |
2275 | mutex_unlock(&opp_table->lock); | |
2276 | ||
fa30184d | 2277 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 2278 | } |
604a7aeb | 2279 | EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); |
4dab160e | 2280 | |
a3c47af6 DO |
2281 | static void devm_pm_opp_unregister_set_opp_helper(void *data) |
2282 | { | |
2283 | dev_pm_opp_unregister_set_opp_helper(data); | |
2284 | } | |
2285 | ||
2286 | /** | |
2287 | * devm_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
2288 | * @dev: Device for which the helper is getting registered. | |
2289 | * @set_opp: Custom set OPP helper. | |
2290 | * | |
2291 | * This is a resource-managed version of dev_pm_opp_register_set_opp_helper(). | |
2292 | * | |
c41c8a34 | 2293 | * Return: 0 on success and errorno otherwise. |
a3c47af6 | 2294 | */ |
c41c8a34 DO |
2295 | int devm_pm_opp_register_set_opp_helper(struct device *dev, |
2296 | int (*set_opp)(struct dev_pm_set_opp_data *data)) | |
a3c47af6 DO |
2297 | { |
2298 | struct opp_table *opp_table; | |
a3c47af6 DO |
2299 | |
2300 | opp_table = dev_pm_opp_register_set_opp_helper(dev, set_opp); | |
2301 | if (IS_ERR(opp_table)) | |
c41c8a34 | 2302 | return PTR_ERR(opp_table); |
a3c47af6 | 2303 | |
c41c8a34 DO |
2304 | return devm_add_action_or_reset(dev, devm_pm_opp_unregister_set_opp_helper, |
2305 | opp_table); | |
a3c47af6 DO |
2306 | } |
2307 | EXPORT_SYMBOL_GPL(devm_pm_opp_register_set_opp_helper); | |
2308 | ||
6319aee1 VK |
2309 | static void _opp_detach_genpd(struct opp_table *opp_table) |
2310 | { | |
2311 | int index; | |
2312 | ||
cb60e960 VK |
2313 | if (!opp_table->genpd_virt_devs) |
2314 | return; | |
2315 | ||
6319aee1 VK |
2316 | for (index = 0; index < opp_table->required_opp_count; index++) { |
2317 | if (!opp_table->genpd_virt_devs[index]) | |
2318 | continue; | |
2319 | ||
2320 | dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false); | |
2321 | opp_table->genpd_virt_devs[index] = NULL; | |
2322 | } | |
c0ab9e08 VK |
2323 | |
2324 | kfree(opp_table->genpd_virt_devs); | |
2325 | opp_table->genpd_virt_devs = NULL; | |
6319aee1 VK |
2326 | } |
2327 | ||
4f018bc0 | 2328 | /** |
6319aee1 VK |
2329 | * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer |
2330 | * @dev: Consumer device for which the genpd is getting attached. | |
2331 | * @names: Null terminated array of pointers containing names of genpd to attach. | |
17a8f868 | 2332 | * @virt_devs: Pointer to return the array of virtual devices. |
4f018bc0 VK |
2333 | * |
2334 | * Multiple generic power domains for a device are supported with the help of | |
2335 | * virtual genpd devices, which are created for each consumer device - genpd | |
2336 | * pair. These are the device structures which are attached to the power domain | |
2337 | * and are required by the OPP core to set the performance state of the genpd. | |
6319aee1 VK |
2338 | * The same API also works for the case where single genpd is available and so |
2339 | * we don't need to support that separately. | |
4f018bc0 VK |
2340 | * |
2341 | * This helper will normally be called by the consumer driver of the device | |
6319aee1 | 2342 | * "dev", as only that has details of the genpd names. |
4f018bc0 | 2343 | * |
6319aee1 VK |
2344 | * This helper needs to be called once with a list of all genpd to attach. |
2345 | * Otherwise the original device structure will be used instead by the OPP core. | |
baea35e4 VK |
2346 | * |
2347 | * The order of entries in the names array must match the order in which | |
2348 | * "required-opps" are added in DT. | |
4f018bc0 | 2349 | */ |
17a8f868 VK |
2350 | struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, |
2351 | const char **names, struct device ***virt_devs) | |
4f018bc0 VK |
2352 | { |
2353 | struct opp_table *opp_table; | |
6319aee1 | 2354 | struct device *virt_dev; |
baea35e4 | 2355 | int index = 0, ret = -EINVAL; |
6319aee1 | 2356 | const char **name = names; |
4f018bc0 | 2357 | |
32439ac7 | 2358 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
2359 | if (IS_ERR(opp_table)) |
2360 | return opp_table; | |
4f018bc0 | 2361 | |
cb60e960 VK |
2362 | if (opp_table->genpd_virt_devs) |
2363 | return opp_table; | |
4f018bc0 | 2364 | |
6319aee1 VK |
2365 | /* |
2366 | * If the genpd's OPP table isn't already initialized, parsing of the | |
2367 | * required-opps fail for dev. We should retry this after genpd's OPP | |
2368 | * table is added. | |
2369 | */ | |
2370 | if (!opp_table->required_opp_count) { | |
2371 | ret = -EPROBE_DEFER; | |
2372 | goto put_table; | |
2373 | } | |
2374 | ||
4f018bc0 VK |
2375 | mutex_lock(&opp_table->genpd_virt_dev_lock); |
2376 | ||
c0ab9e08 VK |
2377 | opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count, |
2378 | sizeof(*opp_table->genpd_virt_devs), | |
2379 | GFP_KERNEL); | |
2380 | if (!opp_table->genpd_virt_devs) | |
2381 | goto unlock; | |
4f018bc0 | 2382 | |
6319aee1 | 2383 | while (*name) { |
6319aee1 VK |
2384 | if (index >= opp_table->required_opp_count) { |
2385 | dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n", | |
2386 | *name, opp_table->required_opp_count, index); | |
2387 | goto err; | |
2388 | } | |
4f018bc0 | 2389 | |
6319aee1 VK |
2390 | virt_dev = dev_pm_domain_attach_by_name(dev, *name); |
2391 | if (IS_ERR(virt_dev)) { | |
2392 | ret = PTR_ERR(virt_dev); | |
2393 | dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret); | |
2394 | goto err; | |
2395 | } | |
2396 | ||
2397 | opp_table->genpd_virt_devs[index] = virt_dev; | |
baea35e4 | 2398 | index++; |
6319aee1 | 2399 | name++; |
4f018bc0 VK |
2400 | } |
2401 | ||
17a8f868 VK |
2402 | if (virt_devs) |
2403 | *virt_devs = opp_table->genpd_virt_devs; | |
4f018bc0 VK |
2404 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2405 | ||
2406 | return opp_table; | |
6319aee1 VK |
2407 | |
2408 | err: | |
2409 | _opp_detach_genpd(opp_table); | |
c0ab9e08 | 2410 | unlock: |
6319aee1 VK |
2411 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2412 | ||
2413 | put_table: | |
2414 | dev_pm_opp_put_opp_table(opp_table); | |
2415 | ||
2416 | return ERR_PTR(ret); | |
4f018bc0 | 2417 | } |
6319aee1 | 2418 | EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd); |
4f018bc0 VK |
2419 | |
2420 | /** | |
6319aee1 VK |
2421 | * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device. |
2422 | * @opp_table: OPP table returned by dev_pm_opp_attach_genpd(). | |
4f018bc0 | 2423 | * |
6319aee1 VK |
2424 | * This detaches the genpd(s), resets the virtual device pointers, and puts the |
2425 | * OPP table. | |
4f018bc0 | 2426 | */ |
6319aee1 | 2427 | void dev_pm_opp_detach_genpd(struct opp_table *opp_table) |
4f018bc0 | 2428 | { |
c7bf8758 VK |
2429 | if (unlikely(!opp_table)) |
2430 | return; | |
2431 | ||
4f018bc0 VK |
2432 | /* |
2433 | * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting | |
2434 | * used in parallel. | |
2435 | */ | |
2436 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
6319aee1 | 2437 | _opp_detach_genpd(opp_table); |
4f018bc0 VK |
2438 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2439 | ||
6319aee1 | 2440 | dev_pm_opp_put_opp_table(opp_table); |
4f018bc0 | 2441 | } |
6319aee1 | 2442 | EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd); |
4f018bc0 | 2443 | |
b4b9e223 DO |
2444 | static void devm_pm_opp_detach_genpd(void *data) |
2445 | { | |
2446 | dev_pm_opp_detach_genpd(data); | |
2447 | } | |
2448 | ||
2449 | /** | |
2450 | * devm_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual | |
2451 | * device pointer | |
2452 | * @dev: Consumer device for which the genpd is getting attached. | |
2453 | * @names: Null terminated array of pointers containing names of genpd to attach. | |
2454 | * @virt_devs: Pointer to return the array of virtual devices. | |
2455 | * | |
2456 | * This is a resource-managed version of dev_pm_opp_attach_genpd(). | |
2457 | * | |
9edf48a4 | 2458 | * Return: 0 on success and errorno otherwise. |
b4b9e223 | 2459 | */ |
9edf48a4 DO |
2460 | int devm_pm_opp_attach_genpd(struct device *dev, const char **names, |
2461 | struct device ***virt_devs) | |
b4b9e223 DO |
2462 | { |
2463 | struct opp_table *opp_table; | |
b4b9e223 DO |
2464 | |
2465 | opp_table = dev_pm_opp_attach_genpd(dev, names, virt_devs); | |
2466 | if (IS_ERR(opp_table)) | |
9edf48a4 | 2467 | return PTR_ERR(opp_table); |
b4b9e223 | 2468 | |
9edf48a4 DO |
2469 | return devm_add_action_or_reset(dev, devm_pm_opp_detach_genpd, |
2470 | opp_table); | |
b4b9e223 DO |
2471 | } |
2472 | EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd); | |
2473 | ||
7d8658ef SK |
2474 | /** |
2475 | * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP. | |
2476 | * @src_table: OPP table which has @dst_table as one of its required OPP table. | |
2477 | * @dst_table: Required OPP table of the @src_table. | |
2478 | * @src_opp: OPP from the @src_table. | |
2479 | * | |
2480 | * This function returns the OPP (present in @dst_table) pointed out by the | |
2481 | * "required-opps" property of the @src_opp (present in @src_table). | |
2482 | * | |
2483 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
2484 | * use. | |
2485 | * | |
2486 | * Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise. | |
2487 | */ | |
2488 | struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table, | |
2489 | struct opp_table *dst_table, | |
2490 | struct dev_pm_opp *src_opp) | |
2491 | { | |
2492 | struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV); | |
2493 | int i; | |
2494 | ||
2495 | if (!src_table || !dst_table || !src_opp || | |
2496 | !src_table->required_opp_tables) | |
2497 | return ERR_PTR(-EINVAL); | |
2498 | ||
2499 | /* required-opps not fully initialized yet */ | |
2500 | if (lazy_linking_pending(src_table)) | |
2501 | return ERR_PTR(-EBUSY); | |
2502 | ||
2503 | for (i = 0; i < src_table->required_opp_count; i++) { | |
2504 | if (src_table->required_opp_tables[i] == dst_table) { | |
2505 | mutex_lock(&src_table->lock); | |
2506 | ||
2507 | list_for_each_entry(opp, &src_table->opp_list, node) { | |
2508 | if (opp == src_opp) { | |
2509 | dest_opp = opp->required_opps[i]; | |
2510 | dev_pm_opp_get(dest_opp); | |
2511 | break; | |
2512 | } | |
2513 | } | |
2514 | ||
2515 | mutex_unlock(&src_table->lock); | |
2516 | break; | |
2517 | } | |
2518 | } | |
2519 | ||
2520 | if (IS_ERR(dest_opp)) { | |
2521 | pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, | |
2522 | src_table, dst_table); | |
2523 | } | |
2524 | ||
2525 | return dest_opp; | |
2526 | } | |
2527 | EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp); | |
2528 | ||
c8a59103 VK |
2529 | /** |
2530 | * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. | |
2531 | * @src_table: OPP table which has dst_table as one of its required OPP table. | |
2532 | * @dst_table: Required OPP table of the src_table. | |
2533 | * @pstate: Current performance state of the src_table. | |
2534 | * | |
2535 | * This Returns pstate of the OPP (present in @dst_table) pointed out by the | |
2536 | * "required-opps" property of the OPP (present in @src_table) which has | |
2537 | * performance state set to @pstate. | |
2538 | * | |
2539 | * Return: Zero or positive performance state on success, otherwise negative | |
2540 | * value on errors. | |
2541 | */ | |
2542 | int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, | |
2543 | struct opp_table *dst_table, | |
2544 | unsigned int pstate) | |
2545 | { | |
2546 | struct dev_pm_opp *opp; | |
2547 | int dest_pstate = -EINVAL; | |
2548 | int i; | |
2549 | ||
c8a59103 VK |
2550 | /* |
2551 | * Normally the src_table will have the "required_opps" property set to | |
2552 | * point to one of the OPPs in the dst_table, but in some cases the | |
2553 | * genpd and its master have one to one mapping of performance states | |
2554 | * and so none of them have the "required-opps" property set. Return the | |
2555 | * pstate of the src_table as it is in such cases. | |
2556 | */ | |
f2f4d2b8 | 2557 | if (!src_table || !src_table->required_opp_count) |
c8a59103 VK |
2558 | return pstate; |
2559 | ||
7eba0c76 VK |
2560 | /* required-opps not fully initialized yet */ |
2561 | if (lazy_linking_pending(src_table)) | |
2562 | return -EBUSY; | |
2563 | ||
c8a59103 VK |
2564 | for (i = 0; i < src_table->required_opp_count; i++) { |
2565 | if (src_table->required_opp_tables[i]->np == dst_table->np) | |
2566 | break; | |
2567 | } | |
2568 | ||
2569 | if (unlikely(i == src_table->required_opp_count)) { | |
2570 | pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", | |
2571 | __func__, src_table, dst_table); | |
2572 | return -EINVAL; | |
2573 | } | |
2574 | ||
2575 | mutex_lock(&src_table->lock); | |
2576 | ||
2577 | list_for_each_entry(opp, &src_table->opp_list, node) { | |
2578 | if (opp->pstate == pstate) { | |
2579 | dest_pstate = opp->required_opps[i]->pstate; | |
2580 | goto unlock; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, | |
2585 | dst_table); | |
2586 | ||
2587 | unlock: | |
2588 | mutex_unlock(&src_table->lock); | |
2589 | ||
2590 | return dest_pstate; | |
2591 | } | |
2592 | ||
38393409 VK |
2593 | /** |
2594 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
2595 | * @dev: device for which we do this operation | |
2596 | * @freq: Frequency in Hz for this OPP | |
2597 | * @u_volt: Voltage in uVolts for this OPP | |
2598 | * | |
2c2709dc | 2599 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
2600 | * The opp is made available by default and it can be controlled using |
2601 | * dev_pm_opp_enable/disable functions. | |
2602 | * | |
38393409 | 2603 | * Return: |
984f16c8 | 2604 | * 0 On success OR |
38393409 | 2605 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 2606 | * -EEXIST Freq are same and volt are different OR |
38393409 | 2607 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 2608 | * -ENOMEM Memory allocation failure |
38393409 VK |
2609 | */ |
2610 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
2611 | { | |
8cd2f6e8 VK |
2612 | struct opp_table *opp_table; |
2613 | int ret; | |
2614 | ||
32439ac7 | 2615 | opp_table = _add_opp_table(dev, true); |
dd461cd9 SG |
2616 | if (IS_ERR(opp_table)) |
2617 | return PTR_ERR(opp_table); | |
8cd2f6e8 | 2618 | |
46f48aca VK |
2619 | /* Fix regulator count for dynamic OPPs */ |
2620 | opp_table->regulator_count = 1; | |
2621 | ||
8cd2f6e8 | 2622 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); |
0ad8c623 VK |
2623 | if (ret) |
2624 | dev_pm_opp_put_opp_table(opp_table); | |
8cd2f6e8 | 2625 | |
8cd2f6e8 | 2626 | return ret; |
38393409 | 2627 | } |
5d4879cd | 2628 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
2629 | |
2630 | /** | |
327854c8 | 2631 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
2632 | * @dev: device for which we do this operation |
2633 | * @freq: OPP frequency to modify availability | |
2634 | * @availability_req: availability status requested for this opp | |
2635 | * | |
052c6f19 VK |
2636 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
2637 | * which is isolated here. | |
e1f60b29 | 2638 | * |
984f16c8 | 2639 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2640 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 2641 | * successful. |
e1f60b29 | 2642 | */ |
327854c8 NM |
2643 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
2644 | bool availability_req) | |
e1f60b29 | 2645 | { |
2c2709dc | 2646 | struct opp_table *opp_table; |
a7f3987e | 2647 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
2648 | int r = 0; |
2649 | ||
2c2709dc VK |
2650 | /* Find the opp_table */ |
2651 | opp_table = _find_opp_table(dev); | |
2652 | if (IS_ERR(opp_table)) { | |
2653 | r = PTR_ERR(opp_table); | |
e1f60b29 | 2654 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 2655 | return r; |
e1f60b29 NM |
2656 | } |
2657 | ||
37a73ec0 VK |
2658 | mutex_lock(&opp_table->lock); |
2659 | ||
e1f60b29 | 2660 | /* Do we have the frequency? */ |
2c2709dc | 2661 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
2662 | if (tmp_opp->rate == freq) { |
2663 | opp = tmp_opp; | |
2664 | break; | |
2665 | } | |
2666 | } | |
37a73ec0 | 2667 | |
e1f60b29 NM |
2668 | if (IS_ERR(opp)) { |
2669 | r = PTR_ERR(opp); | |
2670 | goto unlock; | |
2671 | } | |
2672 | ||
2673 | /* Is update really needed? */ | |
2674 | if (opp->available == availability_req) | |
2675 | goto unlock; | |
e1f60b29 | 2676 | |
a7f3987e | 2677 | opp->available = availability_req; |
e1f60b29 | 2678 | |
e4d8ae00 VK |
2679 | dev_pm_opp_get(opp); |
2680 | mutex_unlock(&opp_table->lock); | |
2681 | ||
03ca370f MH |
2682 | /* Notify the change of the OPP availability */ |
2683 | if (availability_req) | |
052c6f19 | 2684 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 2685 | opp); |
03ca370f | 2686 | else |
052c6f19 | 2687 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 2688 | OPP_EVENT_DISABLE, opp); |
e1f60b29 | 2689 | |
e4d8ae00 VK |
2690 | dev_pm_opp_put(opp); |
2691 | goto put_table; | |
2692 | ||
e1f60b29 | 2693 | unlock: |
5b650b38 | 2694 | mutex_unlock(&opp_table->lock); |
e4d8ae00 | 2695 | put_table: |
5b650b38 | 2696 | dev_pm_opp_put_opp_table(opp_table); |
e1f60b29 NM |
2697 | return r; |
2698 | } | |
2699 | ||
25cb20a2 SB |
2700 | /** |
2701 | * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP | |
2702 | * @dev: device for which we do this operation | |
2703 | * @freq: OPP frequency to adjust voltage of | |
2704 | * @u_volt: new OPP target voltage | |
2705 | * @u_volt_min: new OPP min voltage | |
2706 | * @u_volt_max: new OPP max voltage | |
2707 | * | |
2708 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
2709 | * copy operation, returns 0 if no modifcation was done OR modification was | |
2710 | * successful. | |
2711 | */ | |
2712 | int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, | |
2713 | unsigned long u_volt, unsigned long u_volt_min, | |
2714 | unsigned long u_volt_max) | |
2715 | ||
2716 | { | |
2717 | struct opp_table *opp_table; | |
2718 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); | |
2719 | int r = 0; | |
2720 | ||
2721 | /* Find the opp_table */ | |
2722 | opp_table = _find_opp_table(dev); | |
2723 | if (IS_ERR(opp_table)) { | |
2724 | r = PTR_ERR(opp_table); | |
2725 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); | |
2726 | return r; | |
2727 | } | |
2728 | ||
2729 | mutex_lock(&opp_table->lock); | |
2730 | ||
2731 | /* Do we have the frequency? */ | |
2732 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { | |
2733 | if (tmp_opp->rate == freq) { | |
2734 | opp = tmp_opp; | |
2735 | break; | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | if (IS_ERR(opp)) { | |
2740 | r = PTR_ERR(opp); | |
2741 | goto adjust_unlock; | |
2742 | } | |
2743 | ||
2744 | /* Is update really needed? */ | |
2745 | if (opp->supplies->u_volt == u_volt) | |
2746 | goto adjust_unlock; | |
2747 | ||
2748 | opp->supplies->u_volt = u_volt; | |
2749 | opp->supplies->u_volt_min = u_volt_min; | |
2750 | opp->supplies->u_volt_max = u_volt_max; | |
2751 | ||
2752 | dev_pm_opp_get(opp); | |
2753 | mutex_unlock(&opp_table->lock); | |
2754 | ||
2755 | /* Notify the voltage change of the OPP */ | |
2756 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE, | |
2757 | opp); | |
2758 | ||
2759 | dev_pm_opp_put(opp); | |
2760 | goto adjust_put_table; | |
2761 | ||
2762 | adjust_unlock: | |
2763 | mutex_unlock(&opp_table->lock); | |
2764 | adjust_put_table: | |
2765 | dev_pm_opp_put_opp_table(opp_table); | |
2766 | return r; | |
2767 | } | |
03649154 | 2768 | EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage); |
25cb20a2 | 2769 | |
e1f60b29 | 2770 | /** |
5d4879cd | 2771 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
2772 | * @dev: device for which we do this operation |
2773 | * @freq: OPP frequency to enable | |
2774 | * | |
2775 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
2776 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 2777 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 2778 | * |
984f16c8 | 2779 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2780 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2781 | * successful. |
e1f60b29 | 2782 | */ |
5d4879cd | 2783 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 2784 | { |
327854c8 | 2785 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 2786 | } |
5d4879cd | 2787 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
2788 | |
2789 | /** | |
5d4879cd | 2790 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
2791 | * @dev: device for which we do this operation |
2792 | * @freq: OPP frequency to disable | |
2793 | * | |
2794 | * Disables a provided opp. If the operation is valid, this returns | |
2795 | * 0, else the corresponding error value. It is meant to be a temporary | |
2796 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 2797 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 2798 | * |
984f16c8 | 2799 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2800 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2801 | * successful. |
e1f60b29 | 2802 | */ |
5d4879cd | 2803 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 2804 | { |
327854c8 | 2805 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 2806 | } |
5d4879cd | 2807 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 2808 | |
03ca370f | 2809 | /** |
dc2c9ad5 VK |
2810 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
2811 | * @dev: Device for which notifier needs to be registered | |
2812 | * @nb: Notifier block to be registered | |
984f16c8 | 2813 | * |
dc2c9ad5 VK |
2814 | * Return: 0 on success or a negative error value. |
2815 | */ | |
2816 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
2817 | { | |
2818 | struct opp_table *opp_table; | |
2819 | int ret; | |
2820 | ||
dc2c9ad5 | 2821 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2822 | if (IS_ERR(opp_table)) |
2823 | return PTR_ERR(opp_table); | |
2824 | ||
052c6f19 | 2825 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 2826 | |
5b650b38 | 2827 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2828 | |
2829 | return ret; | |
2830 | } | |
2831 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
2832 | ||
2833 | /** | |
2834 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
2835 | * @dev: Device for which notifier needs to be unregistered | |
2836 | * @nb: Notifier block to be unregistered | |
984f16c8 | 2837 | * |
dc2c9ad5 | 2838 | * Return: 0 on success or a negative error value. |
03ca370f | 2839 | */ |
dc2c9ad5 VK |
2840 | int dev_pm_opp_unregister_notifier(struct device *dev, |
2841 | struct notifier_block *nb) | |
03ca370f | 2842 | { |
dc2c9ad5 VK |
2843 | struct opp_table *opp_table; |
2844 | int ret; | |
03ca370f | 2845 | |
dc2c9ad5 | 2846 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2847 | if (IS_ERR(opp_table)) |
2848 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 2849 | |
052c6f19 | 2850 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 2851 | |
5b650b38 | 2852 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2853 | |
2854 | return ret; | |
03ca370f | 2855 | } |
dc2c9ad5 | 2856 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 2857 | |
8aaf6264 VK |
2858 | /** |
2859 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device | |
2860 | * @dev: device pointer used to lookup OPP table. | |
2861 | * | |
2862 | * Free both OPPs created using static entries present in DT and the | |
2863 | * dynamically added entries. | |
2864 | */ | |
2865 | void dev_pm_opp_remove_table(struct device *dev) | |
9274c892 VK |
2866 | { |
2867 | struct opp_table *opp_table; | |
2868 | ||
2c2709dc VK |
2869 | /* Check for existing table for 'dev' */ |
2870 | opp_table = _find_opp_table(dev); | |
2871 | if (IS_ERR(opp_table)) { | |
2872 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
2873 | |
2874 | if (error != -ENODEV) | |
2c2709dc | 2875 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
2876 | IS_ERR_OR_NULL(dev) ? |
2877 | "Invalid device" : dev_name(dev), | |
2878 | error); | |
5b650b38 | 2879 | return; |
737002b5 VK |
2880 | } |
2881 | ||
922ff075 VK |
2882 | /* |
2883 | * Drop the extra reference only if the OPP table was successfully added | |
2884 | * with dev_pm_opp_of_add_table() earlier. | |
2885 | **/ | |
2886 | if (_opp_remove_all_static(opp_table)) | |
2887 | dev_pm_opp_put_opp_table(opp_table); | |
cdd6ed90 VK |
2888 | |
2889 | /* Drop reference taken by _find_opp_table() */ | |
2890 | dev_pm_opp_put_opp_table(opp_table); | |
737002b5 | 2891 | } |
411466c5 | 2892 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |
ce8073d8 DO |
2893 | |
2894 | /** | |
2895 | * dev_pm_opp_sync_regulators() - Sync state of voltage regulators | |
2896 | * @dev: device for which we do this operation | |
2897 | * | |
2898 | * Sync voltage state of the OPP table regulators. | |
2899 | * | |
2900 | * Return: 0 on success or a negative error value. | |
2901 | */ | |
2902 | int dev_pm_opp_sync_regulators(struct device *dev) | |
2903 | { | |
2904 | struct opp_table *opp_table; | |
2905 | struct regulator *reg; | |
2906 | int i, ret = 0; | |
2907 | ||
2908 | /* Device may not have OPP table */ | |
2909 | opp_table = _find_opp_table(dev); | |
2910 | if (IS_ERR(opp_table)) | |
2911 | return 0; | |
2912 | ||
2913 | /* Regulator may not be required for the device */ | |
2914 | if (unlikely(!opp_table->regulators)) | |
2915 | goto put_table; | |
2916 | ||
2917 | /* Nothing to sync if voltage wasn't changed */ | |
2918 | if (!opp_table->enabled) | |
2919 | goto put_table; | |
2920 | ||
2921 | for (i = 0; i < opp_table->regulator_count; i++) { | |
2922 | reg = opp_table->regulators[i]; | |
2923 | ret = regulator_sync_voltage(reg); | |
2924 | if (ret) | |
2925 | break; | |
2926 | } | |
2927 | put_table: | |
2928 | /* Drop reference taken by _find_opp_table() */ | |
2929 | dev_pm_opp_put_opp_table(opp_table); | |
2930 | ||
2931 | return ret; | |
2932 | } | |
2933 | EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators); |