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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); |
e1f60b29 | 30 | /* Lock to allow exclusive modification to the device and opp lists */ |
2c2709dc | 31 | DEFINE_MUTEX(opp_table_lock); |
27c09484 VK |
32 | /* Flag indicating that opp_tables list is being updated at the moment */ |
33 | static bool opp_tables_busy; | |
e1f60b29 | 34 | |
9e62edac | 35 | static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table) |
06441658 | 36 | { |
2c2709dc | 37 | struct opp_device *opp_dev; |
9e62edac | 38 | bool found = false; |
06441658 | 39 | |
9e62edac | 40 | mutex_lock(&opp_table->lock); |
2c2709dc | 41 | list_for_each_entry(opp_dev, &opp_table->dev_list, node) |
9e62edac VK |
42 | if (opp_dev->dev == dev) { |
43 | found = true; | |
44 | break; | |
45 | } | |
06441658 | 46 | |
9e62edac VK |
47 | mutex_unlock(&opp_table->lock); |
48 | return found; | |
06441658 VK |
49 | } |
50 | ||
6ac42397 | 51 | static struct opp_table *_find_opp_table_unlocked(struct device *dev) |
5b650b38 VK |
52 | { |
53 | struct opp_table *opp_table; | |
54 | ||
55 | list_for_each_entry(opp_table, &opp_tables, node) { | |
9e62edac | 56 | if (_find_opp_dev(dev, opp_table)) { |
5b650b38 | 57 | _get_opp_table_kref(opp_table); |
5b650b38 VK |
58 | return opp_table; |
59 | } | |
60 | } | |
61 | ||
62 | return ERR_PTR(-ENODEV); | |
63 | } | |
64 | ||
e1f60b29 | 65 | /** |
2c2709dc VK |
66 | * _find_opp_table() - find opp_table struct using device pointer |
67 | * @dev: device pointer used to lookup OPP table | |
e1f60b29 | 68 | * |
052c6f19 | 69 | * Search OPP table for one containing matching device. |
e1f60b29 | 70 | * |
2c2709dc | 71 | * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or |
e1f60b29 NM |
72 | * -EINVAL based on type of error. |
73 | * | |
5b650b38 | 74 | * The callers must call dev_pm_opp_put_opp_table() after the table is used. |
e1f60b29 | 75 | */ |
2c2709dc | 76 | struct opp_table *_find_opp_table(struct device *dev) |
e1f60b29 | 77 | { |
2c2709dc | 78 | struct opp_table *opp_table; |
e1f60b29 | 79 | |
50a3cb04 | 80 | if (IS_ERR_OR_NULL(dev)) { |
e1f60b29 NM |
81 | pr_err("%s: Invalid parameters\n", __func__); |
82 | return ERR_PTR(-EINVAL); | |
83 | } | |
84 | ||
5b650b38 VK |
85 | mutex_lock(&opp_table_lock); |
86 | opp_table = _find_opp_table_unlocked(dev); | |
87 | mutex_unlock(&opp_table_lock); | |
e1f60b29 | 88 | |
5b650b38 | 89 | return opp_table; |
e1f60b29 NM |
90 | } |
91 | ||
92 | /** | |
d6d00742 | 93 | * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp |
e1f60b29 NM |
94 | * @opp: opp for which voltage has to be returned for |
95 | * | |
984f16c8 | 96 | * Return: voltage in micro volt corresponding to the opp, else |
e1f60b29 NM |
97 | * return 0 |
98 | * | |
dfbe4678 | 99 | * This is useful only for devices with single power supply. |
e1f60b29 | 100 | */ |
47d43ba7 | 101 | unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) |
e1f60b29 | 102 | { |
052c6f19 | 103 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 104 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
105 | return 0; |
106 | } | |
e1f60b29 | 107 | |
052c6f19 | 108 | return opp->supplies[0].u_volt; |
e1f60b29 | 109 | } |
5d4879cd | 110 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); |
e1f60b29 NM |
111 | |
112 | /** | |
5d4879cd | 113 | * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp |
e1f60b29 NM |
114 | * @opp: opp for which frequency has to be returned for |
115 | * | |
984f16c8 | 116 | * Return: frequency in hertz corresponding to the opp, else |
e1f60b29 | 117 | * return 0 |
e1f60b29 | 118 | */ |
47d43ba7 | 119 | unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) |
e1f60b29 | 120 | { |
06a8a059 | 121 | if (IS_ERR_OR_NULL(opp)) { |
e1f60b29 | 122 | pr_err("%s: Invalid parameters\n", __func__); |
052c6f19 VK |
123 | return 0; |
124 | } | |
e1f60b29 | 125 | |
052c6f19 | 126 | return opp->rate; |
e1f60b29 | 127 | } |
5d4879cd | 128 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); |
e1f60b29 | 129 | |
5b93ac54 RN |
130 | /** |
131 | * dev_pm_opp_get_level() - Gets the level corresponding to an available opp | |
132 | * @opp: opp for which level value has to be returned for | |
133 | * | |
134 | * Return: level read from device tree corresponding to the opp, else | |
135 | * return 0. | |
136 | */ | |
137 | unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp) | |
138 | { | |
139 | if (IS_ERR_OR_NULL(opp) || !opp->available) { | |
140 | pr_err("%s: Invalid parameters\n", __func__); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | return opp->level; | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_level); | |
147 | ||
597ff543 DO |
148 | /** |
149 | * dev_pm_opp_get_required_pstate() - Gets the required performance state | |
150 | * corresponding to an available opp | |
151 | * @opp: opp for which performance state has to be returned for | |
152 | * @index: index of the required opp | |
153 | * | |
154 | * Return: performance state read from device tree corresponding to the | |
155 | * required opp, else return 0. | |
156 | */ | |
157 | unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp, | |
158 | unsigned int index) | |
159 | { | |
160 | if (IS_ERR_OR_NULL(opp) || !opp->available || | |
161 | index >= opp->opp_table->required_opp_count) { | |
162 | pr_err("%s: Invalid parameters\n", __func__); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | return opp->required_opps[index]->pstate; | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate); | |
169 | ||
19445b25 BZ |
170 | /** |
171 | * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not | |
172 | * @opp: opp for which turbo mode is being verified | |
173 | * | |
174 | * Turbo OPPs are not for normal use, and can be enabled (under certain | |
175 | * conditions) for short duration of times to finish high throughput work | |
176 | * quickly. Running on them for longer times may overheat the chip. | |
177 | * | |
178 | * Return: true if opp is turbo opp, else false. | |
19445b25 BZ |
179 | */ |
180 | bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) | |
181 | { | |
052c6f19 | 182 | if (IS_ERR_OR_NULL(opp) || !opp->available) { |
19445b25 BZ |
183 | pr_err("%s: Invalid parameters\n", __func__); |
184 | return false; | |
185 | } | |
186 | ||
052c6f19 | 187 | return opp->turbo; |
19445b25 BZ |
188 | } |
189 | EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); | |
190 | ||
3ca9bb33 VK |
191 | /** |
192 | * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds | |
193 | * @dev: device for which we do this operation | |
194 | * | |
195 | * Return: This function returns the max clock latency in nanoseconds. | |
3ca9bb33 VK |
196 | */ |
197 | unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) | |
198 | { | |
2c2709dc | 199 | struct opp_table *opp_table; |
3ca9bb33 VK |
200 | unsigned long clock_latency_ns; |
201 | ||
2c2709dc VK |
202 | opp_table = _find_opp_table(dev); |
203 | if (IS_ERR(opp_table)) | |
5b650b38 VK |
204 | return 0; |
205 | ||
206 | clock_latency_ns = opp_table->clock_latency_ns_max; | |
207 | ||
208 | dev_pm_opp_put_opp_table(opp_table); | |
3ca9bb33 | 209 | |
3ca9bb33 VK |
210 | return clock_latency_ns; |
211 | } | |
212 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); | |
213 | ||
655c9df9 VK |
214 | /** |
215 | * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds | |
216 | * @dev: device for which we do this operation | |
217 | * | |
218 | * Return: This function returns the max voltage latency in nanoseconds. | |
655c9df9 VK |
219 | */ |
220 | unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) | |
221 | { | |
2c2709dc | 222 | struct opp_table *opp_table; |
655c9df9 | 223 | struct dev_pm_opp *opp; |
478256bd | 224 | struct regulator *reg; |
655c9df9 | 225 | unsigned long latency_ns = 0; |
dfbe4678 VK |
226 | int ret, i, count; |
227 | struct { | |
228 | unsigned long min; | |
229 | unsigned long max; | |
230 | } *uV; | |
231 | ||
cdd3e614 VK |
232 | opp_table = _find_opp_table(dev); |
233 | if (IS_ERR(opp_table)) | |
234 | return 0; | |
235 | ||
dfbe4678 | 236 | /* Regulator may not be required for the device */ |
90e3577b | 237 | if (!opp_table->regulators) |
cdd3e614 | 238 | goto put_opp_table; |
dfbe4678 | 239 | |
90e3577b VK |
240 | count = opp_table->regulator_count; |
241 | ||
dfbe4678 VK |
242 | uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); |
243 | if (!uV) | |
478256bd | 244 | goto put_opp_table; |
655c9df9 | 245 | |
052c6f19 VK |
246 | mutex_lock(&opp_table->lock); |
247 | ||
dfbe4678 VK |
248 | for (i = 0; i < count; i++) { |
249 | uV[i].min = ~0; | |
250 | uV[i].max = 0; | |
655c9df9 | 251 | |
052c6f19 | 252 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
dfbe4678 VK |
253 | if (!opp->available) |
254 | continue; | |
255 | ||
256 | if (opp->supplies[i].u_volt_min < uV[i].min) | |
257 | uV[i].min = opp->supplies[i].u_volt_min; | |
258 | if (opp->supplies[i].u_volt_max > uV[i].max) | |
259 | uV[i].max = opp->supplies[i].u_volt_max; | |
260 | } | |
655c9df9 VK |
261 | } |
262 | ||
052c6f19 | 263 | mutex_unlock(&opp_table->lock); |
655c9df9 VK |
264 | |
265 | /* | |
2c2709dc | 266 | * The caller needs to ensure that opp_table (and hence the regulator) |
655c9df9 VK |
267 | * isn't freed, while we are executing this routine. |
268 | */ | |
8cc31116 | 269 | for (i = 0; i < count; i++) { |
478256bd | 270 | reg = opp_table->regulators[i]; |
dfbe4678 VK |
271 | ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); |
272 | if (ret > 0) | |
273 | latency_ns += ret * 1000; | |
274 | } | |
275 | ||
dfbe4678 | 276 | kfree(uV); |
cdd3e614 VK |
277 | put_opp_table: |
278 | dev_pm_opp_put_opp_table(opp_table); | |
655c9df9 VK |
279 | |
280 | return latency_ns; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); | |
283 | ||
21743447 VK |
284 | /** |
285 | * dev_pm_opp_get_max_transition_latency() - Get max transition latency in | |
286 | * nanoseconds | |
287 | * @dev: device for which we do this operation | |
288 | * | |
289 | * Return: This function returns the max transition latency, in nanoseconds, to | |
290 | * switch from one OPP to other. | |
21743447 VK |
291 | */ |
292 | unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) | |
293 | { | |
294 | return dev_pm_opp_get_max_volt_latency(dev) + | |
295 | dev_pm_opp_get_max_clock_latency(dev); | |
296 | } | |
297 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); | |
298 | ||
4eafbd15 | 299 | /** |
3aa26a3b | 300 | * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz |
4eafbd15 BZ |
301 | * @dev: device for which we do this operation |
302 | * | |
3aa26a3b VK |
303 | * Return: This function returns the frequency of the OPP marked as suspend_opp |
304 | * if one is available, else returns 0; | |
4eafbd15 | 305 | */ |
3aa26a3b | 306 | unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) |
4eafbd15 | 307 | { |
2c2709dc | 308 | struct opp_table *opp_table; |
3aa26a3b | 309 | unsigned long freq = 0; |
4eafbd15 | 310 | |
2c2709dc | 311 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
312 | if (IS_ERR(opp_table)) |
313 | return 0; | |
3aa26a3b | 314 | |
5b650b38 VK |
315 | if (opp_table->suspend_opp && opp_table->suspend_opp->available) |
316 | freq = dev_pm_opp_get_freq(opp_table->suspend_opp); | |
317 | ||
318 | dev_pm_opp_put_opp_table(opp_table); | |
4eafbd15 | 319 | |
3aa26a3b | 320 | return freq; |
4eafbd15 | 321 | } |
3aa26a3b | 322 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); |
4eafbd15 | 323 | |
a1e8c136 VK |
324 | int _get_opp_count(struct opp_table *opp_table) |
325 | { | |
326 | struct dev_pm_opp *opp; | |
327 | int count = 0; | |
328 | ||
329 | mutex_lock(&opp_table->lock); | |
330 | ||
331 | list_for_each_entry(opp, &opp_table->opp_list, node) { | |
332 | if (opp->available) | |
333 | count++; | |
334 | } | |
335 | ||
336 | mutex_unlock(&opp_table->lock); | |
337 | ||
338 | return count; | |
339 | } | |
340 | ||
e1f60b29 | 341 | /** |
2c2709dc | 342 | * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table |
e1f60b29 NM |
343 | * @dev: device for which we do this operation |
344 | * | |
984f16c8 | 345 | * Return: This function returns the number of available opps if there are any, |
e1f60b29 | 346 | * else returns 0 if none or the corresponding error value. |
e1f60b29 | 347 | */ |
5d4879cd | 348 | int dev_pm_opp_get_opp_count(struct device *dev) |
e1f60b29 | 349 | { |
2c2709dc | 350 | struct opp_table *opp_table; |
a1e8c136 | 351 | int count; |
e1f60b29 | 352 | |
2c2709dc VK |
353 | opp_table = _find_opp_table(dev); |
354 | if (IS_ERR(opp_table)) { | |
355 | count = PTR_ERR(opp_table); | |
035ed072 | 356 | dev_dbg(dev, "%s: OPP table not found (%d)\n", |
b4718c02 | 357 | __func__, count); |
09f662f9 | 358 | return count; |
e1f60b29 NM |
359 | } |
360 | ||
a1e8c136 | 361 | count = _get_opp_count(opp_table); |
5b650b38 VK |
362 | dev_pm_opp_put_opp_table(opp_table); |
363 | ||
e1f60b29 NM |
364 | return count; |
365 | } | |
5d4879cd | 366 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); |
e1f60b29 NM |
367 | |
368 | /** | |
5d4879cd | 369 | * dev_pm_opp_find_freq_exact() - search for an exact frequency |
e1f60b29 NM |
370 | * @dev: device for which we do this operation |
371 | * @freq: frequency to search for | |
7ae49618 | 372 | * @available: true/false - match for available opp |
e1f60b29 | 373 | * |
2c2709dc | 374 | * Return: Searches for exact match in the opp table and returns pointer to the |
984f16c8 NM |
375 | * matching opp if found, else returns ERR_PTR in case of error and should |
376 | * be handled using IS_ERR. Error return values can be: | |
0779726c NM |
377 | * EINVAL: for bad pointer |
378 | * ERANGE: no match found for search | |
379 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 NM |
380 | * |
381 | * Note: available is a modifier for the search. if available=true, then the | |
382 | * match is for exact matching frequency and is available in the stored OPP | |
383 | * table. if false, the match is for exact frequency which is not available. | |
384 | * | |
385 | * This provides a mechanism to enable an opp which is not available currently | |
386 | * or the opposite as well. | |
387 | * | |
8a31d9d9 VK |
388 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
389 | * use. | |
e1f60b29 | 390 | */ |
47d43ba7 NM |
391 | struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, |
392 | unsigned long freq, | |
393 | bool available) | |
e1f60b29 | 394 | { |
2c2709dc | 395 | struct opp_table *opp_table; |
47d43ba7 | 396 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 | 397 | |
2c2709dc VK |
398 | opp_table = _find_opp_table(dev); |
399 | if (IS_ERR(opp_table)) { | |
400 | int r = PTR_ERR(opp_table); | |
401 | ||
402 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
e1f60b29 NM |
403 | return ERR_PTR(r); |
404 | } | |
405 | ||
052c6f19 | 406 | mutex_lock(&opp_table->lock); |
5b650b38 | 407 | |
052c6f19 | 408 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
409 | if (temp_opp->available == available && |
410 | temp_opp->rate == freq) { | |
411 | opp = temp_opp; | |
8a31d9d9 VK |
412 | |
413 | /* Increment the reference count of OPP */ | |
414 | dev_pm_opp_get(opp); | |
e1f60b29 NM |
415 | break; |
416 | } | |
417 | } | |
418 | ||
052c6f19 | 419 | mutex_unlock(&opp_table->lock); |
5b650b38 | 420 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 421 | |
e1f60b29 NM |
422 | return opp; |
423 | } | |
5d4879cd | 424 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); |
e1f60b29 | 425 | |
71419d84 NC |
426 | /** |
427 | * dev_pm_opp_find_level_exact() - search for an exact level | |
428 | * @dev: device for which we do this operation | |
429 | * @level: level to search for | |
430 | * | |
431 | * Return: Searches for exact match in the opp table and returns pointer to the | |
432 | * matching opp if found, else returns ERR_PTR in case of error and should | |
433 | * be handled using IS_ERR. Error return values can be: | |
434 | * EINVAL: for bad pointer | |
435 | * ERANGE: no match found for search | |
436 | * ENODEV: if device not found in list of registered devices | |
437 | * | |
438 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
439 | * use. | |
440 | */ | |
441 | struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev, | |
442 | unsigned int level) | |
443 | { | |
444 | struct opp_table *opp_table; | |
445 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
446 | ||
447 | opp_table = _find_opp_table(dev); | |
448 | if (IS_ERR(opp_table)) { | |
449 | int r = PTR_ERR(opp_table); | |
450 | ||
451 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
452 | return ERR_PTR(r); | |
453 | } | |
454 | ||
455 | mutex_lock(&opp_table->lock); | |
456 | ||
457 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
458 | if (temp_opp->level == level) { | |
459 | opp = temp_opp; | |
460 | ||
461 | /* Increment the reference count of OPP */ | |
462 | dev_pm_opp_get(opp); | |
463 | break; | |
464 | } | |
465 | } | |
466 | ||
467 | mutex_unlock(&opp_table->lock); | |
468 | dev_pm_opp_put_opp_table(opp_table); | |
469 | ||
470 | return opp; | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact); | |
473 | ||
8dd5cada DO |
474 | /** |
475 | * dev_pm_opp_find_level_ceil() - search for an rounded up level | |
476 | * @dev: device for which we do this operation | |
477 | * @level: level to search for | |
478 | * | |
479 | * Return: Searches for rounded up match in the opp table and returns pointer | |
480 | * to the matching opp if found, else returns ERR_PTR in case of error and | |
481 | * should be handled using IS_ERR. Error return values can be: | |
482 | * EINVAL: for bad pointer | |
483 | * ERANGE: no match found for search | |
484 | * ENODEV: if device not found in list of registered devices | |
485 | * | |
486 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
487 | * use. | |
488 | */ | |
489 | struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev, | |
490 | unsigned int *level) | |
491 | { | |
492 | struct opp_table *opp_table; | |
493 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
494 | ||
495 | opp_table = _find_opp_table(dev); | |
496 | if (IS_ERR(opp_table)) { | |
497 | int r = PTR_ERR(opp_table); | |
498 | ||
499 | dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); | |
500 | return ERR_PTR(r); | |
501 | } | |
502 | ||
503 | mutex_lock(&opp_table->lock); | |
504 | ||
505 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
506 | if (temp_opp->available && temp_opp->level >= *level) { | |
507 | opp = temp_opp; | |
508 | *level = opp->level; | |
509 | ||
510 | /* Increment the reference count of OPP */ | |
511 | dev_pm_opp_get(opp); | |
512 | break; | |
513 | } | |
514 | } | |
515 | ||
516 | mutex_unlock(&opp_table->lock); | |
517 | dev_pm_opp_put_opp_table(opp_table); | |
518 | ||
519 | return opp; | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil); | |
522 | ||
067b7ce0 JZ |
523 | static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, |
524 | unsigned long *freq) | |
525 | { | |
526 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
527 | ||
052c6f19 VK |
528 | mutex_lock(&opp_table->lock); |
529 | ||
530 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
067b7ce0 JZ |
531 | if (temp_opp->available && temp_opp->rate >= *freq) { |
532 | opp = temp_opp; | |
533 | *freq = opp->rate; | |
8a31d9d9 VK |
534 | |
535 | /* Increment the reference count of OPP */ | |
536 | dev_pm_opp_get(opp); | |
067b7ce0 JZ |
537 | break; |
538 | } | |
539 | } | |
540 | ||
052c6f19 VK |
541 | mutex_unlock(&opp_table->lock); |
542 | ||
067b7ce0 JZ |
543 | return opp; |
544 | } | |
545 | ||
e1f60b29 | 546 | /** |
5d4879cd | 547 | * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq |
e1f60b29 NM |
548 | * @dev: device for which we do this operation |
549 | * @freq: Start frequency | |
550 | * | |
551 | * Search for the matching ceil *available* OPP from a starting freq | |
552 | * for a device. | |
553 | * | |
984f16c8 | 554 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
555 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
556 | * values can be: | |
557 | * EINVAL: for bad pointer | |
558 | * ERANGE: no match found for search | |
559 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 560 | * |
8a31d9d9 VK |
561 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
562 | * use. | |
e1f60b29 | 563 | */ |
47d43ba7 NM |
564 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, |
565 | unsigned long *freq) | |
e1f60b29 | 566 | { |
2c2709dc | 567 | struct opp_table *opp_table; |
8a31d9d9 | 568 | struct dev_pm_opp *opp; |
b02ded24 | 569 | |
e1f60b29 NM |
570 | if (!dev || !freq) { |
571 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
572 | return ERR_PTR(-EINVAL); | |
573 | } | |
574 | ||
2c2709dc | 575 | opp_table = _find_opp_table(dev); |
5b650b38 | 576 | if (IS_ERR(opp_table)) |
2c2709dc | 577 | return ERR_CAST(opp_table); |
5b650b38 | 578 | |
8a31d9d9 | 579 | opp = _find_freq_ceil(opp_table, freq); |
e1f60b29 | 580 | |
5b650b38 | 581 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 VK |
582 | |
583 | return opp; | |
e1f60b29 | 584 | } |
5d4879cd | 585 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); |
e1f60b29 NM |
586 | |
587 | /** | |
5d4879cd | 588 | * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq |
e1f60b29 NM |
589 | * @dev: device for which we do this operation |
590 | * @freq: Start frequency | |
591 | * | |
592 | * Search for the matching floor *available* OPP from a starting freq | |
593 | * for a device. | |
594 | * | |
984f16c8 | 595 | * Return: matching *opp and refreshes *freq accordingly, else returns |
0779726c NM |
596 | * ERR_PTR in case of error and should be handled using IS_ERR. Error return |
597 | * values can be: | |
598 | * EINVAL: for bad pointer | |
599 | * ERANGE: no match found for search | |
600 | * ENODEV: if device not found in list of registered devices | |
e1f60b29 | 601 | * |
8a31d9d9 VK |
602 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
603 | * use. | |
e1f60b29 | 604 | */ |
47d43ba7 NM |
605 | struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, |
606 | unsigned long *freq) | |
e1f60b29 | 607 | { |
2c2709dc | 608 | struct opp_table *opp_table; |
47d43ba7 | 609 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); |
e1f60b29 NM |
610 | |
611 | if (!dev || !freq) { | |
612 | dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); | |
613 | return ERR_PTR(-EINVAL); | |
614 | } | |
615 | ||
2c2709dc | 616 | opp_table = _find_opp_table(dev); |
5b650b38 | 617 | if (IS_ERR(opp_table)) |
2c2709dc | 618 | return ERR_CAST(opp_table); |
5b650b38 | 619 | |
052c6f19 | 620 | mutex_lock(&opp_table->lock); |
e1f60b29 | 621 | |
052c6f19 | 622 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
623 | if (temp_opp->available) { |
624 | /* go to the next node, before choosing prev */ | |
625 | if (temp_opp->rate > *freq) | |
626 | break; | |
627 | else | |
628 | opp = temp_opp; | |
629 | } | |
630 | } | |
8a31d9d9 VK |
631 | |
632 | /* Increment the reference count of OPP */ | |
633 | if (!IS_ERR(opp)) | |
634 | dev_pm_opp_get(opp); | |
052c6f19 | 635 | mutex_unlock(&opp_table->lock); |
5b650b38 | 636 | dev_pm_opp_put_opp_table(opp_table); |
8a31d9d9 | 637 | |
e1f60b29 NM |
638 | if (!IS_ERR(opp)) |
639 | *freq = opp->rate; | |
640 | ||
641 | return opp; | |
642 | } | |
5d4879cd | 643 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); |
e1f60b29 | 644 | |
2f36bde0 AC |
645 | /** |
646 | * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for | |
647 | * target voltage. | |
648 | * @dev: Device for which we do this operation. | |
649 | * @u_volt: Target voltage. | |
650 | * | |
651 | * Search for OPP with highest (ceil) frequency and has voltage <= u_volt. | |
652 | * | |
653 | * Return: matching *opp, else returns ERR_PTR in case of error which should be | |
654 | * handled using IS_ERR. | |
655 | * | |
656 | * Error return values can be: | |
657 | * EINVAL: bad parameters | |
658 | * | |
659 | * The callers are required to call dev_pm_opp_put() for the returned OPP after | |
660 | * use. | |
661 | */ | |
662 | struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev, | |
663 | unsigned long u_volt) | |
664 | { | |
665 | struct opp_table *opp_table; | |
666 | struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); | |
667 | ||
668 | if (!dev || !u_volt) { | |
669 | dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__, | |
670 | u_volt); | |
671 | return ERR_PTR(-EINVAL); | |
672 | } | |
673 | ||
674 | opp_table = _find_opp_table(dev); | |
675 | if (IS_ERR(opp_table)) | |
676 | return ERR_CAST(opp_table); | |
677 | ||
678 | mutex_lock(&opp_table->lock); | |
679 | ||
680 | list_for_each_entry(temp_opp, &opp_table->opp_list, node) { | |
681 | if (temp_opp->available) { | |
682 | if (temp_opp->supplies[0].u_volt > u_volt) | |
683 | break; | |
684 | opp = temp_opp; | |
685 | } | |
686 | } | |
687 | ||
688 | /* Increment the reference count of OPP */ | |
689 | if (!IS_ERR(opp)) | |
690 | dev_pm_opp_get(opp); | |
691 | ||
692 | mutex_unlock(&opp_table->lock); | |
693 | dev_pm_opp_put_opp_table(opp_table); | |
694 | ||
695 | return opp; | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt); | |
698 | ||
6a0712f6 | 699 | static int _set_opp_voltage(struct device *dev, struct regulator *reg, |
ce31781a | 700 | struct dev_pm_opp_supply *supply) |
6a0712f6 VK |
701 | { |
702 | int ret; | |
703 | ||
704 | /* Regulator not available for device */ | |
705 | if (IS_ERR(reg)) { | |
706 | dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, | |
707 | PTR_ERR(reg)); | |
708 | return 0; | |
709 | } | |
710 | ||
ce31781a VK |
711 | dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, |
712 | supply->u_volt_min, supply->u_volt, supply->u_volt_max); | |
6a0712f6 | 713 | |
ce31781a VK |
714 | ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, |
715 | supply->u_volt, supply->u_volt_max); | |
6a0712f6 VK |
716 | if (ret) |
717 | dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", | |
ce31781a VK |
718 | __func__, supply->u_volt_min, supply->u_volt, |
719 | supply->u_volt_max, ret); | |
6a0712f6 VK |
720 | |
721 | return ret; | |
722 | } | |
723 | ||
285881b5 VK |
724 | static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk, |
725 | unsigned long freq) | |
94735585 VK |
726 | { |
727 | int ret; | |
728 | ||
729 | ret = clk_set_rate(clk, freq); | |
730 | if (ret) { | |
731 | dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, | |
732 | ret); | |
733 | } | |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
8d45719c | 738 | static int _generic_set_opp_regulator(struct opp_table *opp_table, |
c74b32fa VK |
739 | struct device *dev, |
740 | unsigned long old_freq, | |
741 | unsigned long freq, | |
742 | struct dev_pm_opp_supply *old_supply, | |
743 | struct dev_pm_opp_supply *new_supply) | |
94735585 | 744 | { |
c74b32fa | 745 | struct regulator *reg = opp_table->regulators[0]; |
94735585 VK |
746 | int ret; |
747 | ||
748 | /* This function only supports single regulator per device */ | |
c74b32fa | 749 | if (WARN_ON(opp_table->regulator_count > 1)) { |
94735585 VK |
750 | dev_err(dev, "multiple regulators are not supported\n"); |
751 | return -EINVAL; | |
752 | } | |
753 | ||
754 | /* Scaling up? Scale voltage before frequency */ | |
c5c2a97b | 755 | if (freq >= old_freq) { |
94735585 VK |
756 | ret = _set_opp_voltage(dev, reg, new_supply); |
757 | if (ret) | |
758 | goto restore_voltage; | |
759 | } | |
760 | ||
761 | /* Change frequency */ | |
285881b5 | 762 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
94735585 VK |
763 | if (ret) |
764 | goto restore_voltage; | |
765 | ||
766 | /* Scaling down? Scale voltage after frequency */ | |
767 | if (freq < old_freq) { | |
768 | ret = _set_opp_voltage(dev, reg, new_supply); | |
769 | if (ret) | |
770 | goto restore_freq; | |
771 | } | |
772 | ||
8d45719c KK |
773 | /* |
774 | * Enable the regulator after setting its voltages, otherwise it breaks | |
775 | * some boot-enabled regulators. | |
776 | */ | |
72f80ce4 | 777 | if (unlikely(!opp_table->enabled)) { |
8d45719c KK |
778 | ret = regulator_enable(reg); |
779 | if (ret < 0) | |
780 | dev_warn(dev, "Failed to enable regulator: %d", ret); | |
8d45719c KK |
781 | } |
782 | ||
94735585 VK |
783 | return 0; |
784 | ||
785 | restore_freq: | |
285881b5 | 786 | if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq)) |
94735585 VK |
787 | dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
788 | __func__, old_freq); | |
789 | restore_voltage: | |
790 | /* This shouldn't harm even if the voltages weren't updated earlier */ | |
81c4d8a3 | 791 | _set_opp_voltage(dev, reg, old_supply); |
94735585 VK |
792 | |
793 | return ret; | |
794 | } | |
795 | ||
b00e667a VK |
796 | static int _set_opp_bw(const struct opp_table *opp_table, |
797 | struct dev_pm_opp *opp, struct device *dev, bool remove) | |
798 | { | |
799 | u32 avg, peak; | |
800 | int i, ret; | |
801 | ||
802 | if (!opp_table->paths) | |
803 | return 0; | |
804 | ||
805 | for (i = 0; i < opp_table->path_count; i++) { | |
806 | if (remove) { | |
807 | avg = 0; | |
808 | peak = 0; | |
809 | } else { | |
810 | avg = opp->bandwidth[i].avg; | |
811 | peak = opp->bandwidth[i].peak; | |
812 | } | |
813 | ret = icc_set_bw(opp_table->paths[i], avg, peak); | |
814 | if (ret) { | |
815 | dev_err(dev, "Failed to %s bandwidth[%d]: %d\n", | |
816 | remove ? "remove" : "set", i, ret); | |
817 | return ret; | |
818 | } | |
819 | } | |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
7e535993 VK |
824 | static int _set_opp_custom(const struct opp_table *opp_table, |
825 | struct device *dev, unsigned long old_freq, | |
826 | unsigned long freq, | |
827 | struct dev_pm_opp_supply *old_supply, | |
828 | struct dev_pm_opp_supply *new_supply) | |
829 | { | |
04b447df | 830 | struct dev_pm_set_opp_data *data = opp_table->set_opp_data; |
7e535993 VK |
831 | int size; |
832 | ||
04b447df DO |
833 | /* |
834 | * We support this only if dev_pm_opp_set_regulators() was called | |
835 | * earlier. | |
836 | */ | |
837 | if (opp_table->sod_supplies) { | |
838 | size = sizeof(*old_supply) * opp_table->regulator_count; | |
81c4d8a3 | 839 | memcpy(data->old_opp.supplies, old_supply, size); |
04b447df DO |
840 | memcpy(data->new_opp.supplies, new_supply, size); |
841 | data->regulator_count = opp_table->regulator_count; | |
842 | } else { | |
843 | data->regulator_count = 0; | |
844 | } | |
845 | ||
7e535993 | 846 | data->regulators = opp_table->regulators; |
7e535993 VK |
847 | data->clk = opp_table->clk; |
848 | data->dev = dev; | |
7e535993 | 849 | data->old_opp.rate = old_freq; |
7e535993 | 850 | data->new_opp.rate = freq; |
7e535993 VK |
851 | |
852 | return opp_table->set_opp(data); | |
853 | } | |
854 | ||
60cdeae0 SG |
855 | static int _set_required_opp(struct device *dev, struct device *pd_dev, |
856 | struct dev_pm_opp *opp, int i) | |
857 | { | |
858 | unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0; | |
859 | int ret; | |
860 | ||
861 | if (!pd_dev) | |
862 | return 0; | |
863 | ||
864 | ret = dev_pm_genpd_set_performance_state(pd_dev, pstate); | |
865 | if (ret) { | |
866 | dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", | |
867 | dev_name(pd_dev), pstate, ret); | |
868 | } | |
869 | ||
870 | return ret; | |
871 | } | |
872 | ||
ca1b5d77 VK |
873 | /* This is only called for PM domain for now */ |
874 | static int _set_required_opps(struct device *dev, | |
875 | struct opp_table *opp_table, | |
2c59138c | 876 | struct dev_pm_opp *opp, bool up) |
ca1b5d77 VK |
877 | { |
878 | struct opp_table **required_opp_tables = opp_table->required_opp_tables; | |
879 | struct device **genpd_virt_devs = opp_table->genpd_virt_devs; | |
ca1b5d77 VK |
880 | int i, ret = 0; |
881 | ||
882 | if (!required_opp_tables) | |
883 | return 0; | |
884 | ||
885 | /* Single genpd case */ | |
60cdeae0 SG |
886 | if (!genpd_virt_devs) |
887 | return _set_required_opp(dev, dev, opp, 0); | |
ca1b5d77 VK |
888 | |
889 | /* Multiple genpd case */ | |
890 | ||
891 | /* | |
892 | * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev | |
893 | * after it is freed from another thread. | |
894 | */ | |
895 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
896 | ||
2c59138c SG |
897 | /* Scaling up? Set required OPPs in normal order, else reverse */ |
898 | if (up) { | |
899 | for (i = 0; i < opp_table->required_opp_count; i++) { | |
900 | ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i); | |
901 | if (ret) | |
902 | break; | |
903 | } | |
904 | } else { | |
905 | for (i = opp_table->required_opp_count - 1; i >= 0; i--) { | |
906 | ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i); | |
907 | if (ret) | |
908 | break; | |
ca1b5d77 VK |
909 | } |
910 | } | |
2c59138c | 911 | |
ca1b5d77 VK |
912 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
913 | ||
914 | return ret; | |
915 | } | |
916 | ||
3ae1f39a SS |
917 | /** |
918 | * dev_pm_opp_set_bw() - sets bandwidth levels corresponding to an opp | |
919 | * @dev: device for which we do this operation | |
920 | * @opp: opp based on which the bandwidth levels are to be configured | |
921 | * | |
922 | * This configures the bandwidth to the levels specified by the OPP. However | |
923 | * if the OPP specified is NULL the bandwidth levels are cleared out. | |
924 | * | |
925 | * Return: 0 on success or a negative error value. | |
926 | */ | |
927 | int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp) | |
928 | { | |
929 | struct opp_table *opp_table; | |
930 | int ret; | |
931 | ||
932 | opp_table = _find_opp_table(dev); | |
933 | if (IS_ERR(opp_table)) { | |
934 | dev_err(dev, "%s: device opp table doesn't exist\n", __func__); | |
935 | return PTR_ERR(opp_table); | |
936 | } | |
937 | ||
938 | if (opp) | |
939 | ret = _set_opp_bw(opp_table, opp, dev, false); | |
940 | else | |
941 | ret = _set_opp_bw(opp_table, NULL, dev, true); | |
942 | ||
943 | dev_pm_opp_put_opp_table(opp_table); | |
944 | return ret; | |
945 | } | |
946 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_bw); | |
947 | ||
81c4d8a3 VK |
948 | static void _find_current_opp(struct device *dev, struct opp_table *opp_table) |
949 | { | |
950 | struct dev_pm_opp *opp = ERR_PTR(-ENODEV); | |
951 | unsigned long freq; | |
952 | ||
953 | if (!IS_ERR(opp_table->clk)) { | |
954 | freq = clk_get_rate(opp_table->clk); | |
955 | opp = _find_freq_ceil(opp_table, &freq); | |
956 | } | |
957 | ||
958 | /* | |
959 | * Unable to find the current OPP ? Pick the first from the list since | |
960 | * it is in ascending order, otherwise rest of the code will need to | |
961 | * make special checks to validate current_opp. | |
962 | */ | |
963 | if (IS_ERR(opp)) { | |
964 | mutex_lock(&opp_table->lock); | |
965 | opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node); | |
966 | dev_pm_opp_get(opp); | |
967 | mutex_unlock(&opp_table->lock); | |
968 | } | |
969 | ||
970 | opp_table->current_opp = opp; | |
971 | } | |
972 | ||
5ad58bba | 973 | static int _disable_opp_table(struct device *dev, struct opp_table *opp_table) |
f3364e17 VK |
974 | { |
975 | int ret; | |
976 | ||
977 | if (!opp_table->enabled) | |
978 | return 0; | |
979 | ||
980 | /* | |
981 | * Some drivers need to support cases where some platforms may | |
982 | * have OPP table for the device, while others don't and | |
983 | * opp_set_rate() just needs to behave like clk_set_rate(). | |
984 | */ | |
985 | if (!_get_opp_count(opp_table)) | |
986 | return 0; | |
987 | ||
988 | ret = _set_opp_bw(opp_table, NULL, dev, true); | |
989 | if (ret) | |
990 | return ret; | |
991 | ||
992 | if (opp_table->regulators) | |
993 | regulator_disable(opp_table->regulators[0]); | |
994 | ||
2c59138c | 995 | ret = _set_required_opps(dev, opp_table, NULL, false); |
f3364e17 VK |
996 | |
997 | opp_table->enabled = false; | |
998 | return ret; | |
999 | } | |
1000 | ||
386ba854 VK |
1001 | static int _set_opp(struct device *dev, struct opp_table *opp_table, |
1002 | struct dev_pm_opp *opp, unsigned long freq) | |
6a0712f6 | 1003 | { |
386ba854 VK |
1004 | struct dev_pm_opp *old_opp; |
1005 | unsigned long old_freq; | |
b00e667a | 1006 | int ret; |
6a0712f6 | 1007 | |
386ba854 VK |
1008 | if (unlikely(!opp)) |
1009 | return _disable_opp_table(dev, opp_table); | |
aca48b61 | 1010 | |
81c4d8a3 VK |
1011 | /* Find the currently set OPP if we don't know already */ |
1012 | if (unlikely(!opp_table->current_opp)) | |
1013 | _find_current_opp(dev, opp_table); | |
6a0712f6 | 1014 | |
81c4d8a3 VK |
1015 | old_opp = opp_table->current_opp; |
1016 | old_freq = old_opp->rate; | |
1017 | ||
1018 | /* Return early if nothing to do */ | |
1019 | if (opp_table->enabled && old_opp == opp) { | |
1020 | dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__); | |
386ba854 | 1021 | return 0; |
6a0712f6 VK |
1022 | } |
1023 | ||
94735585 VK |
1024 | dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, |
1025 | old_freq, freq); | |
dfbe4678 | 1026 | |
ca1b5d77 | 1027 | /* Scaling up? Configure required OPPs before frequency */ |
faef080f | 1028 | if (freq >= old_freq) { |
2c59138c | 1029 | ret = _set_required_opps(dev, opp_table, opp, true); |
ca1b5d77 | 1030 | if (ret) |
386ba854 | 1031 | return ret; |
ca1b5d77 VK |
1032 | } |
1033 | ||
7e535993 VK |
1034 | if (opp_table->set_opp) { |
1035 | ret = _set_opp_custom(opp_table, dev, old_freq, freq, | |
81c4d8a3 | 1036 | old_opp->supplies, opp->supplies); |
7e535993 | 1037 | } else if (opp_table->regulators) { |
c74b32fa | 1038 | ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, |
81c4d8a3 | 1039 | old_opp->supplies, |
c74b32fa VK |
1040 | opp->supplies); |
1041 | } else { | |
7e535993 | 1042 | /* Only frequency scaling */ |
1d3c42ca | 1043 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); |
ca1b5d77 | 1044 | } |
c74b32fa | 1045 | |
ca1b5d77 VK |
1046 | /* Scaling down? Configure required OPPs after frequency */ |
1047 | if (!ret && freq < old_freq) { | |
2c59138c | 1048 | ret = _set_required_opps(dev, opp_table, opp, false); |
ca1b5d77 VK |
1049 | if (ret) |
1050 | dev_err(dev, "Failed to set required opps: %d\n", ret); | |
dfbe4678 VK |
1051 | } |
1052 | ||
72f80ce4 | 1053 | if (!ret) { |
b00e667a | 1054 | ret = _set_opp_bw(opp_table, opp, dev, false); |
81c4d8a3 | 1055 | if (!ret) { |
72f80ce4 | 1056 | opp_table->enabled = true; |
81c4d8a3 VK |
1057 | dev_pm_opp_put(old_opp); |
1058 | ||
1059 | /* Make sure current_opp doesn't get freed */ | |
1060 | dev_pm_opp_get(opp); | |
1061 | opp_table->current_opp = opp; | |
1062 | } | |
72f80ce4 | 1063 | } |
fe2af402 | 1064 | |
386ba854 VK |
1065 | return ret; |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * dev_pm_opp_set_rate() - Configure new OPP based on frequency | |
1070 | * @dev: device for which we do this operation | |
1071 | * @target_freq: frequency to achieve | |
1072 | * | |
1073 | * This configures the power-supplies to the levels specified by the OPP | |
1074 | * corresponding to the target_freq, and programs the clock to a value <= | |
1075 | * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax | |
1076 | * provided by the opp, should have already rounded to the target OPP's | |
1077 | * frequency. | |
1078 | */ | |
1079 | int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) | |
1080 | { | |
1081 | struct opp_table *opp_table; | |
1082 | unsigned long freq = 0, temp_freq; | |
1083 | struct dev_pm_opp *opp = NULL; | |
1084 | int ret; | |
1085 | ||
1086 | opp_table = _find_opp_table(dev); | |
1087 | if (IS_ERR(opp_table)) { | |
1088 | dev_err(dev, "%s: device's opp table doesn't exist\n", __func__); | |
1089 | return PTR_ERR(opp_table); | |
1090 | } | |
1091 | ||
1092 | if (target_freq) { | |
1093 | /* | |
1094 | * For IO devices which require an OPP on some platforms/SoCs | |
1095 | * while just needing to scale the clock on some others | |
1096 | * we look for empty OPP tables with just a clock handle and | |
1097 | * scale only the clk. This makes dev_pm_opp_set_rate() | |
1098 | * equivalent to a clk_set_rate() | |
1099 | */ | |
1100 | if (!_get_opp_count(opp_table)) { | |
1101 | ret = _generic_set_opp_clk_only(dev, opp_table->clk, target_freq); | |
1102 | goto put_opp_table; | |
1103 | } | |
1104 | ||
1105 | freq = clk_round_rate(opp_table->clk, target_freq); | |
1106 | if ((long)freq <= 0) | |
1107 | freq = target_freq; | |
1108 | ||
1109 | /* | |
1110 | * The clock driver may support finer resolution of the | |
1111 | * frequencies than the OPP table, don't update the frequency we | |
1112 | * pass to clk_set_rate() here. | |
1113 | */ | |
1114 | temp_freq = freq; | |
1115 | opp = _find_freq_ceil(opp_table, &temp_freq); | |
1116 | if (IS_ERR(opp)) { | |
1117 | ret = PTR_ERR(opp); | |
1118 | dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", | |
1119 | __func__, freq, ret); | |
1120 | goto put_opp_table; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | ret = _set_opp(dev, opp_table, opp, freq); | |
1125 | ||
1126 | if (target_freq) | |
1127 | dev_pm_opp_put(opp); | |
052c6f19 | 1128 | put_opp_table: |
5b650b38 | 1129 | dev_pm_opp_put_opp_table(opp_table); |
052c6f19 | 1130 | return ret; |
6a0712f6 VK |
1131 | } |
1132 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); | |
1133 | ||
2c2709dc | 1134 | /* OPP-dev Helpers */ |
2c2709dc VK |
1135 | static void _remove_opp_dev(struct opp_device *opp_dev, |
1136 | struct opp_table *opp_table) | |
06441658 | 1137 | { |
2c2709dc VK |
1138 | opp_debug_unregister(opp_dev, opp_table); |
1139 | list_del(&opp_dev->node); | |
052c6f19 | 1140 | kfree(opp_dev); |
06441658 VK |
1141 | } |
1142 | ||
ef43f01a VK |
1143 | struct opp_device *_add_opp_dev(const struct device *dev, |
1144 | struct opp_table *opp_table) | |
06441658 | 1145 | { |
2c2709dc | 1146 | struct opp_device *opp_dev; |
06441658 | 1147 | |
2c2709dc VK |
1148 | opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); |
1149 | if (!opp_dev) | |
06441658 VK |
1150 | return NULL; |
1151 | ||
2c2709dc VK |
1152 | /* Initialize opp-dev */ |
1153 | opp_dev->dev = dev; | |
3d255699 | 1154 | |
ef43f01a | 1155 | mutex_lock(&opp_table->lock); |
052c6f19 | 1156 | list_add(&opp_dev->node, &opp_table->dev_list); |
ef43f01a | 1157 | mutex_unlock(&opp_table->lock); |
06441658 | 1158 | |
2c2709dc | 1159 | /* Create debugfs entries for the opp_table */ |
a2dea4cb | 1160 | opp_debug_register(opp_dev, opp_table); |
283d55e6 VK |
1161 | |
1162 | return opp_dev; | |
1163 | } | |
1164 | ||
eb7c8743 | 1165 | static struct opp_table *_allocate_opp_table(struct device *dev, int index) |
07cce74a | 1166 | { |
2c2709dc VK |
1167 | struct opp_table *opp_table; |
1168 | struct opp_device *opp_dev; | |
d54974c2 | 1169 | int ret; |
07cce74a VK |
1170 | |
1171 | /* | |
2c2709dc | 1172 | * Allocate a new OPP table. In the infrequent case where a new |
07cce74a VK |
1173 | * device is needed to be added, we pay this penalty. |
1174 | */ | |
2c2709dc VK |
1175 | opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); |
1176 | if (!opp_table) | |
dd461cd9 | 1177 | return ERR_PTR(-ENOMEM); |
07cce74a | 1178 | |
3d255699 | 1179 | mutex_init(&opp_table->lock); |
4f018bc0 | 1180 | mutex_init(&opp_table->genpd_virt_dev_lock); |
2c2709dc | 1181 | INIT_LIST_HEAD(&opp_table->dev_list); |
06441658 | 1182 | |
46f48aca VK |
1183 | /* Mark regulator count uninitialized */ |
1184 | opp_table->regulator_count = -1; | |
1185 | ||
2c2709dc VK |
1186 | opp_dev = _add_opp_dev(dev, opp_table); |
1187 | if (!opp_dev) { | |
dd461cd9 SG |
1188 | ret = -ENOMEM; |
1189 | goto err; | |
06441658 VK |
1190 | } |
1191 | ||
eb7c8743 | 1192 | _of_init_opp_table(opp_table, dev, index); |
50f8cfbd | 1193 | |
6d3f922c GD |
1194 | /* Find interconnect path(s) for the device */ |
1195 | ret = dev_pm_opp_of_find_icc_paths(dev, opp_table); | |
dd461cd9 SG |
1196 | if (ret) { |
1197 | if (ret == -EPROBE_DEFER) | |
32439ac7 | 1198 | goto remove_opp_dev; |
dd461cd9 | 1199 | |
6d3f922c GD |
1200 | dev_warn(dev, "%s: Error finding interconnect paths: %d\n", |
1201 | __func__, ret); | |
dd461cd9 | 1202 | } |
6d3f922c | 1203 | |
052c6f19 | 1204 | BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); |
2c2709dc | 1205 | INIT_LIST_HEAD(&opp_table->opp_list); |
f067a982 | 1206 | kref_init(&opp_table->kref); |
07cce74a | 1207 | |
2c2709dc | 1208 | return opp_table; |
dd461cd9 | 1209 | |
976509bb QW |
1210 | remove_opp_dev: |
1211 | _remove_opp_dev(opp_dev, opp_table); | |
dd461cd9 SG |
1212 | err: |
1213 | kfree(opp_table); | |
1214 | return ERR_PTR(ret); | |
07cce74a VK |
1215 | } |
1216 | ||
f067a982 | 1217 | void _get_opp_table_kref(struct opp_table *opp_table) |
b6160e26 | 1218 | { |
f067a982 VK |
1219 | kref_get(&opp_table->kref); |
1220 | } | |
1221 | ||
32439ac7 VK |
1222 | static struct opp_table *_update_opp_table_clk(struct device *dev, |
1223 | struct opp_table *opp_table, | |
1224 | bool getclk) | |
1225 | { | |
1226 | /* | |
1227 | * Return early if we don't need to get clk or we have already tried it | |
1228 | * earlier. | |
1229 | */ | |
1230 | if (!getclk || IS_ERR(opp_table) || opp_table->clk) | |
1231 | return opp_table; | |
1232 | ||
1233 | /* Find clk for the device */ | |
1234 | opp_table->clk = clk_get(dev, NULL); | |
1235 | if (IS_ERR(opp_table->clk)) { | |
1236 | int ret = PTR_ERR(opp_table->clk); | |
1237 | ||
1238 | if (ret == -EPROBE_DEFER) { | |
1239 | dev_pm_opp_put_opp_table(opp_table); | |
1240 | return ERR_PTR(ret); | |
1241 | } | |
1242 | ||
1243 | dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret); | |
1244 | } | |
1245 | ||
1246 | return opp_table; | |
1247 | } | |
1248 | ||
27c09484 VK |
1249 | /* |
1250 | * We need to make sure that the OPP table for a device doesn't get added twice, | |
1251 | * if this routine gets called in parallel with the same device pointer. | |
1252 | * | |
1253 | * The simplest way to enforce that is to perform everything (find existing | |
1254 | * table and if not found, create a new one) under the opp_table_lock, so only | |
1255 | * one creator gets access to the same. But that expands the critical section | |
1256 | * under the lock and may end up causing circular dependencies with frameworks | |
1257 | * like debugfs, interconnect or clock framework as they may be direct or | |
1258 | * indirect users of OPP core. | |
1259 | * | |
1260 | * And for that reason we have to go for a bit tricky implementation here, which | |
1261 | * uses the opp_tables_busy flag to indicate if another creator is in the middle | |
1262 | * of adding an OPP table and others should wait for it to finish. | |
1263 | */ | |
32439ac7 VK |
1264 | struct opp_table *_add_opp_table_indexed(struct device *dev, int index, |
1265 | bool getclk) | |
f067a982 VK |
1266 | { |
1267 | struct opp_table *opp_table; | |
1268 | ||
27c09484 | 1269 | again: |
f067a982 VK |
1270 | mutex_lock(&opp_table_lock); |
1271 | ||
5b650b38 VK |
1272 | opp_table = _find_opp_table_unlocked(dev); |
1273 | if (!IS_ERR(opp_table)) | |
f067a982 | 1274 | goto unlock; |
f067a982 | 1275 | |
27c09484 VK |
1276 | /* |
1277 | * The opp_tables list or an OPP table's dev_list is getting updated by | |
1278 | * another user, wait for it to finish. | |
1279 | */ | |
1280 | if (unlikely(opp_tables_busy)) { | |
1281 | mutex_unlock(&opp_table_lock); | |
1282 | cpu_relax(); | |
1283 | goto again; | |
1284 | } | |
1285 | ||
1286 | opp_tables_busy = true; | |
283d55e6 | 1287 | opp_table = _managed_opp(dev, index); |
27c09484 VK |
1288 | |
1289 | /* Drop the lock to reduce the size of critical section */ | |
1290 | mutex_unlock(&opp_table_lock); | |
1291 | ||
283d55e6 | 1292 | if (opp_table) { |
ef43f01a | 1293 | if (!_add_opp_dev(dev, opp_table)) { |
283d55e6 | 1294 | dev_pm_opp_put_opp_table(opp_table); |
dd461cd9 | 1295 | opp_table = ERR_PTR(-ENOMEM); |
283d55e6 | 1296 | } |
27c09484 VK |
1297 | |
1298 | mutex_lock(&opp_table_lock); | |
1299 | } else { | |
1300 | opp_table = _allocate_opp_table(dev, index); | |
1301 | ||
1302 | mutex_lock(&opp_table_lock); | |
1303 | if (!IS_ERR(opp_table)) | |
1304 | list_add(&opp_table->node, &opp_tables); | |
283d55e6 VK |
1305 | } |
1306 | ||
27c09484 | 1307 | opp_tables_busy = false; |
f067a982 VK |
1308 | |
1309 | unlock: | |
1310 | mutex_unlock(&opp_table_lock); | |
1311 | ||
32439ac7 | 1312 | return _update_opp_table_clk(dev, opp_table, getclk); |
f067a982 | 1313 | } |
eb7c8743 | 1314 | |
32439ac7 | 1315 | static struct opp_table *_add_opp_table(struct device *dev, bool getclk) |
eb7c8743 | 1316 | { |
32439ac7 | 1317 | return _add_opp_table_indexed(dev, 0, getclk); |
eb7c8743 | 1318 | } |
f067a982 | 1319 | |
e77dcb0b | 1320 | struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) |
eb7c8743 | 1321 | { |
e77dcb0b | 1322 | return _find_opp_table(dev); |
eb7c8743 | 1323 | } |
e77dcb0b | 1324 | EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
eb7c8743 | 1325 | |
b83c1899 | 1326 | static void _opp_table_kref_release(struct kref *kref) |
f067a982 VK |
1327 | { |
1328 | struct opp_table *opp_table = container_of(kref, struct opp_table, kref); | |
cdd6ed90 | 1329 | struct opp_device *opp_dev, *temp; |
6d3f922c | 1330 | int i; |
b6160e26 | 1331 | |
e0df59de VK |
1332 | /* Drop the lock as soon as we can */ |
1333 | list_del(&opp_table->node); | |
1334 | mutex_unlock(&opp_table_lock); | |
1335 | ||
81c4d8a3 VK |
1336 | if (opp_table->current_opp) |
1337 | dev_pm_opp_put(opp_table->current_opp); | |
1338 | ||
5d6d106f VK |
1339 | _of_clear_opp_table(opp_table); |
1340 | ||
b6160e26 VK |
1341 | /* Release clk */ |
1342 | if (!IS_ERR(opp_table->clk)) | |
1343 | clk_put(opp_table->clk); | |
1344 | ||
6d3f922c GD |
1345 | if (opp_table->paths) { |
1346 | for (i = 0; i < opp_table->path_count; i++) | |
1347 | icc_put(opp_table->paths[i]); | |
1348 | kfree(opp_table->paths); | |
1349 | } | |
1350 | ||
cdd6ed90 | 1351 | WARN_ON(!list_empty(&opp_table->opp_list)); |
b6160e26 | 1352 | |
cdd6ed90 VK |
1353 | list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { |
1354 | /* | |
1355 | * The OPP table is getting removed, drop the performance state | |
1356 | * constraints. | |
1357 | */ | |
1358 | if (opp_table->genpd_performance_state) | |
1359 | dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); | |
b6160e26 | 1360 | |
cdd6ed90 VK |
1361 | _remove_opp_dev(opp_dev, opp_table); |
1362 | } | |
b6160e26 | 1363 | |
4f018bc0 | 1364 | mutex_destroy(&opp_table->genpd_virt_dev_lock); |
37a73ec0 | 1365 | mutex_destroy(&opp_table->lock); |
052c6f19 | 1366 | kfree(opp_table); |
f067a982 VK |
1367 | } |
1368 | ||
1369 | void dev_pm_opp_put_opp_table(struct opp_table *opp_table) | |
1370 | { | |
1371 | kref_put_mutex(&opp_table->kref, _opp_table_kref_release, | |
1372 | &opp_table_lock); | |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); | |
1375 | ||
8cd2f6e8 | 1376 | void _opp_free(struct dev_pm_opp *opp) |
969fceb3 VK |
1377 | { |
1378 | kfree(opp); | |
969fceb3 VK |
1379 | } |
1380 | ||
cf1fac94 | 1381 | static void _opp_kref_release(struct kref *kref) |
129eec55 | 1382 | { |
cf1fac94 VK |
1383 | struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); |
1384 | struct opp_table *opp_table = opp->opp_table; | |
1385 | ||
1386 | list_del(&opp->node); | |
1387 | mutex_unlock(&opp_table->lock); | |
1388 | ||
129eec55 VK |
1389 | /* |
1390 | * Notify the changes in the availability of the operable | |
1391 | * frequency/voltage list. | |
1392 | */ | |
052c6f19 | 1393 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); |
da544b61 | 1394 | _of_opp_free_required_opps(opp_table, opp); |
deaa5146 | 1395 | opp_debug_remove_one(opp); |
052c6f19 | 1396 | kfree(opp); |
1690d8bb | 1397 | } |
129eec55 | 1398 | |
a88bd2a5 | 1399 | void dev_pm_opp_get(struct dev_pm_opp *opp) |
8a31d9d9 VK |
1400 | { |
1401 | kref_get(&opp->kref); | |
1402 | } | |
1403 | ||
7034764a VK |
1404 | void dev_pm_opp_put(struct dev_pm_opp *opp) |
1405 | { | |
cf1fac94 | 1406 | kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock); |
7034764a VK |
1407 | } |
1408 | EXPORT_SYMBOL_GPL(dev_pm_opp_put); | |
1409 | ||
129eec55 | 1410 | /** |
2c2709dc | 1411 | * dev_pm_opp_remove() - Remove an OPP from OPP table |
129eec55 VK |
1412 | * @dev: device for which we do this operation |
1413 | * @freq: OPP to remove with matching 'freq' | |
1414 | * | |
2c2709dc | 1415 | * This function removes an opp from the opp table. |
129eec55 VK |
1416 | */ |
1417 | void dev_pm_opp_remove(struct device *dev, unsigned long freq) | |
1418 | { | |
1419 | struct dev_pm_opp *opp; | |
2c2709dc | 1420 | struct opp_table *opp_table; |
129eec55 VK |
1421 | bool found = false; |
1422 | ||
2c2709dc VK |
1423 | opp_table = _find_opp_table(dev); |
1424 | if (IS_ERR(opp_table)) | |
5b650b38 | 1425 | return; |
129eec55 | 1426 | |
37a73ec0 VK |
1427 | mutex_lock(&opp_table->lock); |
1428 | ||
2c2709dc | 1429 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
129eec55 VK |
1430 | if (opp->rate == freq) { |
1431 | found = true; | |
1432 | break; | |
1433 | } | |
1434 | } | |
1435 | ||
37a73ec0 VK |
1436 | mutex_unlock(&opp_table->lock); |
1437 | ||
5b650b38 VK |
1438 | if (found) { |
1439 | dev_pm_opp_put(opp); | |
0ad8c623 VK |
1440 | |
1441 | /* Drop the reference taken by dev_pm_opp_add() */ | |
1442 | dev_pm_opp_put_opp_table(opp_table); | |
5b650b38 | 1443 | } else { |
129eec55 VK |
1444 | dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
1445 | __func__, freq); | |
129eec55 VK |
1446 | } |
1447 | ||
0ad8c623 | 1448 | /* Drop the reference taken by _find_opp_table() */ |
5b650b38 | 1449 | dev_pm_opp_put_opp_table(opp_table); |
129eec55 VK |
1450 | } |
1451 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove); | |
1452 | ||
cf1fac94 VK |
1453 | static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table, |
1454 | bool dynamic) | |
1455 | { | |
1456 | struct dev_pm_opp *opp = NULL, *temp; | |
1457 | ||
1458 | mutex_lock(&opp_table->lock); | |
1459 | list_for_each_entry(temp, &opp_table->opp_list, node) { | |
1460 | if (dynamic == temp->dynamic) { | |
1461 | opp = temp; | |
1462 | break; | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | mutex_unlock(&opp_table->lock); | |
1467 | return opp; | |
1468 | } | |
1469 | ||
922ff075 | 1470 | bool _opp_remove_all_static(struct opp_table *opp_table) |
03758d60 | 1471 | { |
cf1fac94 | 1472 | struct dev_pm_opp *opp; |
03758d60 VK |
1473 | |
1474 | mutex_lock(&opp_table->lock); | |
1475 | ||
922ff075 | 1476 | if (!opp_table->parsed_static_opps) { |
cf1fac94 VK |
1477 | mutex_unlock(&opp_table->lock); |
1478 | return false; | |
922ff075 VK |
1479 | } |
1480 | ||
cf1fac94 VK |
1481 | if (--opp_table->parsed_static_opps) { |
1482 | mutex_unlock(&opp_table->lock); | |
1483 | return true; | |
03758d60 VK |
1484 | } |
1485 | ||
03758d60 | 1486 | mutex_unlock(&opp_table->lock); |
922ff075 | 1487 | |
cf1fac94 VK |
1488 | /* |
1489 | * Can't remove the OPP from under the lock, debugfs removal needs to | |
1490 | * happen lock less to avoid circular dependency issues. | |
1491 | */ | |
1492 | while ((opp = _opp_get_next(opp_table, false))) | |
1493 | dev_pm_opp_put(opp); | |
1494 | ||
1495 | return true; | |
03758d60 VK |
1496 | } |
1497 | ||
1690d8bb VK |
1498 | /** |
1499 | * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs | |
1500 | * @dev: device for which we do this operation | |
1501 | * | |
1502 | * This function removes all dynamically created OPPs from the opp table. | |
1503 | */ | |
1504 | void dev_pm_opp_remove_all_dynamic(struct device *dev) | |
1505 | { | |
1506 | struct opp_table *opp_table; | |
cf1fac94 | 1507 | struct dev_pm_opp *opp; |
1690d8bb VK |
1508 | int count = 0; |
1509 | ||
1510 | opp_table = _find_opp_table(dev); | |
1511 | if (IS_ERR(opp_table)) | |
1512 | return; | |
1513 | ||
cf1fac94 VK |
1514 | /* |
1515 | * Can't remove the OPP from under the lock, debugfs removal needs to | |
1516 | * happen lock less to avoid circular dependency issues. | |
1517 | */ | |
1518 | while ((opp = _opp_get_next(opp_table, true))) { | |
1519 | dev_pm_opp_put(opp); | |
1520 | count++; | |
1690d8bb | 1521 | } |
1690d8bb VK |
1522 | |
1523 | /* Drop the references taken by dev_pm_opp_add() */ | |
1524 | while (count--) | |
1525 | dev_pm_opp_put_opp_table(opp_table); | |
1526 | ||
1527 | /* Drop the reference taken by _find_opp_table() */ | |
1528 | dev_pm_opp_put_opp_table(opp_table); | |
1529 | } | |
1530 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic); | |
1531 | ||
8cd2f6e8 | 1532 | struct dev_pm_opp *_opp_allocate(struct opp_table *table) |
e1f60b29 | 1533 | { |
23dacf6d | 1534 | struct dev_pm_opp *opp; |
6d3f922c | 1535 | int supply_count, supply_size, icc_size; |
e1f60b29 | 1536 | |
dfbe4678 | 1537 | /* Allocate space for at least one supply */ |
6d3f922c GD |
1538 | supply_count = table->regulator_count > 0 ? table->regulator_count : 1; |
1539 | supply_size = sizeof(*opp->supplies) * supply_count; | |
1540 | icc_size = sizeof(*opp->bandwidth) * table->path_count; | |
e1f60b29 | 1541 | |
dfbe4678 | 1542 | /* allocate new OPP node and supplies structures */ |
6d3f922c GD |
1543 | opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL); |
1544 | ||
8cd2f6e8 | 1545 | if (!opp) |
23dacf6d | 1546 | return NULL; |
23dacf6d | 1547 | |
dfbe4678 VK |
1548 | /* Put the supplies at the end of the OPP structure as an empty array */ |
1549 | opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); | |
6d3f922c GD |
1550 | if (icc_size) |
1551 | opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count); | |
dfbe4678 VK |
1552 | INIT_LIST_HEAD(&opp->node); |
1553 | ||
23dacf6d VK |
1554 | return opp; |
1555 | } | |
1556 | ||
7d34d56e | 1557 | static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, |
2c2709dc | 1558 | struct opp_table *opp_table) |
7d34d56e | 1559 | { |
dfbe4678 VK |
1560 | struct regulator *reg; |
1561 | int i; | |
1562 | ||
90e3577b VK |
1563 | if (!opp_table->regulators) |
1564 | return true; | |
1565 | ||
dfbe4678 VK |
1566 | for (i = 0; i < opp_table->regulator_count; i++) { |
1567 | reg = opp_table->regulators[i]; | |
1568 | ||
1569 | if (!regulator_is_supported_voltage(reg, | |
1570 | opp->supplies[i].u_volt_min, | |
1571 | opp->supplies[i].u_volt_max)) { | |
1572 | pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", | |
1573 | __func__, opp->supplies[i].u_volt_min, | |
1574 | opp->supplies[i].u_volt_max); | |
1575 | return false; | |
1576 | } | |
7d34d56e VK |
1577 | } |
1578 | ||
1579 | return true; | |
1580 | } | |
1581 | ||
6c591eec SK |
1582 | int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2) |
1583 | { | |
1584 | if (opp1->rate != opp2->rate) | |
1585 | return opp1->rate < opp2->rate ? -1 : 1; | |
6d3f922c GD |
1586 | if (opp1->bandwidth && opp2->bandwidth && |
1587 | opp1->bandwidth[0].peak != opp2->bandwidth[0].peak) | |
1588 | return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1; | |
6c591eec SK |
1589 | if (opp1->level != opp2->level) |
1590 | return opp1->level < opp2->level ? -1 : 1; | |
1591 | return 0; | |
1592 | } | |
1593 | ||
a1e8c136 VK |
1594 | static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, |
1595 | struct opp_table *opp_table, | |
1596 | struct list_head **head) | |
23dacf6d VK |
1597 | { |
1598 | struct dev_pm_opp *opp; | |
6c591eec | 1599 | int opp_cmp; |
23dacf6d VK |
1600 | |
1601 | /* | |
1602 | * Insert new OPP in order of increasing frequency and discard if | |
1603 | * already present. | |
1604 | * | |
2c2709dc | 1605 | * Need to use &opp_table->opp_list in the condition part of the 'for' |
23dacf6d VK |
1606 | * loop, don't replace it with head otherwise it will become an infinite |
1607 | * loop. | |
1608 | */ | |
052c6f19 | 1609 | list_for_each_entry(opp, &opp_table->opp_list, node) { |
6c591eec SK |
1610 | opp_cmp = _opp_compare_key(new_opp, opp); |
1611 | if (opp_cmp > 0) { | |
a1e8c136 | 1612 | *head = &opp->node; |
23dacf6d VK |
1613 | continue; |
1614 | } | |
1615 | ||
6c591eec | 1616 | if (opp_cmp < 0) |
a1e8c136 | 1617 | return 0; |
23dacf6d VK |
1618 | |
1619 | /* Duplicate OPPs */ | |
06441658 | 1620 | dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", |
dfbe4678 VK |
1621 | __func__, opp->rate, opp->supplies[0].u_volt, |
1622 | opp->available, new_opp->rate, | |
1623 | new_opp->supplies[0].u_volt, new_opp->available); | |
23dacf6d | 1624 | |
dfbe4678 | 1625 | /* Should we compare voltages for all regulators here ? */ |
a1e8c136 VK |
1626 | return opp->available && |
1627 | new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; | |
1628 | } | |
1629 | ||
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * Returns: | |
1635 | * 0: On success. And appropriate error message for duplicate OPPs. | |
1636 | * -EBUSY: For OPP with same freq/volt and is available. The callers of | |
1637 | * _opp_add() must return 0 if they receive -EBUSY from it. This is to make | |
1638 | * sure we don't print error messages unnecessarily if different parts of | |
1639 | * kernel try to initialize the OPP table. | |
1640 | * -EEXIST: For OPP with same freq but different volt or is unavailable. This | |
1641 | * should be considered an error by the callers of _opp_add(). | |
1642 | */ | |
1643 | int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, | |
1644 | struct opp_table *opp_table, bool rate_not_available) | |
1645 | { | |
1646 | struct list_head *head; | |
cf65948d | 1647 | unsigned int i; |
a1e8c136 VK |
1648 | int ret; |
1649 | ||
1650 | mutex_lock(&opp_table->lock); | |
1651 | head = &opp_table->opp_list; | |
37a73ec0 | 1652 | |
32715be4 DO |
1653 | ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); |
1654 | if (ret) { | |
1655 | mutex_unlock(&opp_table->lock); | |
1656 | return ret; | |
23dacf6d VK |
1657 | } |
1658 | ||
052c6f19 | 1659 | list_add(&new_opp->node, head); |
37a73ec0 VK |
1660 | mutex_unlock(&opp_table->lock); |
1661 | ||
1662 | new_opp->opp_table = opp_table; | |
7034764a | 1663 | kref_init(&new_opp->kref); |
23dacf6d | 1664 | |
a2dea4cb | 1665 | opp_debug_create_one(new_opp, opp_table); |
deaa5146 | 1666 | |
2c2709dc | 1667 | if (!_opp_supported_by_regulators(new_opp, opp_table)) { |
7d34d56e VK |
1668 | new_opp->available = false; |
1669 | dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", | |
1670 | __func__, new_opp->rate); | |
1671 | } | |
1672 | ||
cf65948d DO |
1673 | for (i = 0; i < opp_table->required_opp_count; i++) { |
1674 | if (new_opp->required_opps[i]->available) | |
1675 | continue; | |
1676 | ||
1677 | new_opp->available = false; | |
1678 | dev_warn(dev, "%s: OPP not supported by required OPP %pOF (%lu)\n", | |
1679 | __func__, new_opp->required_opps[i]->np, new_opp->rate); | |
1680 | break; | |
1681 | } | |
1682 | ||
23dacf6d VK |
1683 | return 0; |
1684 | } | |
1685 | ||
984f16c8 | 1686 | /** |
b64b9c3f | 1687 | * _opp_add_v1() - Allocate a OPP based on v1 bindings. |
8cd2f6e8 | 1688 | * @opp_table: OPP table |
984f16c8 NM |
1689 | * @dev: device for which we do this operation |
1690 | * @freq: Frequency in Hz for this OPP | |
1691 | * @u_volt: Voltage in uVolts for this OPP | |
1692 | * @dynamic: Dynamically added OPPs. | |
1693 | * | |
2c2709dc | 1694 | * This function adds an opp definition to the opp table and returns status. |
984f16c8 NM |
1695 | * The opp is made available by default and it can be controlled using |
1696 | * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. | |
1697 | * | |
8f8d37b2 VK |
1698 | * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table |
1699 | * and freed by dev_pm_opp_of_remove_table. | |
984f16c8 | 1700 | * |
984f16c8 NM |
1701 | * Return: |
1702 | * 0 On success OR | |
1703 | * Duplicate OPPs (both freq and volt are same) and opp->available | |
1704 | * -EEXIST Freq are same and volt are different OR | |
1705 | * Duplicate OPPs (both freq and volt are same) and !opp->available | |
1706 | * -ENOMEM Memory allocation failure | |
1707 | */ | |
8cd2f6e8 VK |
1708 | int _opp_add_v1(struct opp_table *opp_table, struct device *dev, |
1709 | unsigned long freq, long u_volt, bool dynamic) | |
e1f60b29 | 1710 | { |
23dacf6d | 1711 | struct dev_pm_opp *new_opp; |
50f8cfbd | 1712 | unsigned long tol; |
6ce4184d | 1713 | int ret; |
e1f60b29 | 1714 | |
8cd2f6e8 VK |
1715 | new_opp = _opp_allocate(opp_table); |
1716 | if (!new_opp) | |
1717 | return -ENOMEM; | |
23dacf6d | 1718 | |
a7470db6 | 1719 | /* populate the opp table */ |
a7470db6 | 1720 | new_opp->rate = freq; |
2c2709dc | 1721 | tol = u_volt * opp_table->voltage_tolerance_v1 / 100; |
dfbe4678 VK |
1722 | new_opp->supplies[0].u_volt = u_volt; |
1723 | new_opp->supplies[0].u_volt_min = u_volt - tol; | |
1724 | new_opp->supplies[0].u_volt_max = u_volt + tol; | |
a7470db6 | 1725 | new_opp->available = true; |
23dacf6d | 1726 | new_opp->dynamic = dynamic; |
a7470db6 | 1727 | |
a1e8c136 | 1728 | ret = _opp_add(dev, new_opp, opp_table, false); |
7f8538eb VK |
1729 | if (ret) { |
1730 | /* Don't return error for duplicate OPPs */ | |
1731 | if (ret == -EBUSY) | |
1732 | ret = 0; | |
6ce4184d | 1733 | goto free_opp; |
7f8538eb | 1734 | } |
64ce8545 | 1735 | |
03ca370f MH |
1736 | /* |
1737 | * Notify the changes in the availability of the operable | |
1738 | * frequency/voltage list. | |
1739 | */ | |
052c6f19 | 1740 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
e1f60b29 | 1741 | return 0; |
6ce4184d VK |
1742 | |
1743 | free_opp: | |
8cd2f6e8 VK |
1744 | _opp_free(new_opp); |
1745 | ||
6ce4184d | 1746 | return ret; |
e1f60b29 | 1747 | } |
38393409 | 1748 | |
7de36b0a VK |
1749 | /** |
1750 | * dev_pm_opp_set_supported_hw() - Set supported platforms | |
1751 | * @dev: Device for which supported-hw has to be set. | |
1752 | * @versions: Array of hierarchy of versions to match. | |
1753 | * @count: Number of elements in the array. | |
1754 | * | |
1755 | * This is required only for the V2 bindings, and it enables a platform to | |
1756 | * specify the hierarchy of versions it supports. OPP layer will then enable | |
1757 | * OPPs, which are available for those versions, based on its 'opp-supported-hw' | |
1758 | * property. | |
7de36b0a | 1759 | */ |
fa30184d VK |
1760 | struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, |
1761 | const u32 *versions, unsigned int count) | |
7de36b0a | 1762 | { |
2c2709dc | 1763 | struct opp_table *opp_table; |
7de36b0a | 1764 | |
32439ac7 | 1765 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
1766 | if (IS_ERR(opp_table)) |
1767 | return opp_table; | |
7de36b0a | 1768 | |
2c2709dc VK |
1769 | /* Make sure there are no concurrent readers while updating opp_table */ |
1770 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1771 | |
25419de1 VK |
1772 | /* Another CPU that shares the OPP table has set the property ? */ |
1773 | if (opp_table->supported_hw) | |
1774 | return opp_table; | |
7de36b0a | 1775 | |
2c2709dc | 1776 | opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), |
7de36b0a | 1777 | GFP_KERNEL); |
2c2709dc | 1778 | if (!opp_table->supported_hw) { |
25419de1 VK |
1779 | dev_pm_opp_put_opp_table(opp_table); |
1780 | return ERR_PTR(-ENOMEM); | |
7de36b0a VK |
1781 | } |
1782 | ||
2c2709dc | 1783 | opp_table->supported_hw_count = count; |
fa30184d VK |
1784 | |
1785 | return opp_table; | |
7de36b0a VK |
1786 | } |
1787 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); | |
1788 | ||
1789 | /** | |
1790 | * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw | |
fa30184d | 1791 | * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). |
7de36b0a VK |
1792 | * |
1793 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1794 | * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure |
7de36b0a | 1795 | * will not be freed. |
7de36b0a | 1796 | */ |
fa30184d | 1797 | void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) |
7de36b0a | 1798 | { |
c7bf8758 VK |
1799 | if (unlikely(!opp_table)) |
1800 | return; | |
1801 | ||
2c2709dc VK |
1802 | /* Make sure there are no concurrent readers while updating opp_table */ |
1803 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
7de36b0a | 1804 | |
2c2709dc VK |
1805 | kfree(opp_table->supported_hw); |
1806 | opp_table->supported_hw = NULL; | |
1807 | opp_table->supported_hw_count = 0; | |
7de36b0a | 1808 | |
fa30184d | 1809 | dev_pm_opp_put_opp_table(opp_table); |
7de36b0a VK |
1810 | } |
1811 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); | |
1812 | ||
01fb4d3c VK |
1813 | /** |
1814 | * dev_pm_opp_set_prop_name() - Set prop-extn name | |
a5da6447 | 1815 | * @dev: Device for which the prop-name has to be set. |
01fb4d3c VK |
1816 | * @name: name to postfix to properties. |
1817 | * | |
1818 | * This is required only for the V2 bindings, and it enables a platform to | |
1819 | * specify the extn to be used for certain property names. The properties to | |
1820 | * which the extension will apply are opp-microvolt and opp-microamp. OPP core | |
1821 | * should postfix the property name with -<name> while looking for them. | |
01fb4d3c | 1822 | */ |
fa30184d | 1823 | struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) |
01fb4d3c | 1824 | { |
2c2709dc | 1825 | struct opp_table *opp_table; |
01fb4d3c | 1826 | |
32439ac7 | 1827 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
1828 | if (IS_ERR(opp_table)) |
1829 | return opp_table; | |
01fb4d3c | 1830 | |
2c2709dc VK |
1831 | /* Make sure there are no concurrent readers while updating opp_table */ |
1832 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1833 | |
878ec1a9 VK |
1834 | /* Another CPU that shares the OPP table has set the property ? */ |
1835 | if (opp_table->prop_name) | |
1836 | return opp_table; | |
01fb4d3c | 1837 | |
2c2709dc VK |
1838 | opp_table->prop_name = kstrdup(name, GFP_KERNEL); |
1839 | if (!opp_table->prop_name) { | |
878ec1a9 VK |
1840 | dev_pm_opp_put_opp_table(opp_table); |
1841 | return ERR_PTR(-ENOMEM); | |
01fb4d3c VK |
1842 | } |
1843 | ||
fa30184d | 1844 | return opp_table; |
01fb4d3c VK |
1845 | } |
1846 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); | |
1847 | ||
1848 | /** | |
1849 | * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name | |
fa30184d | 1850 | * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). |
01fb4d3c VK |
1851 | * |
1852 | * This is required only for the V2 bindings, and is called for a matching | |
2c2709dc | 1853 | * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure |
01fb4d3c | 1854 | * will not be freed. |
01fb4d3c | 1855 | */ |
fa30184d | 1856 | void dev_pm_opp_put_prop_name(struct opp_table *opp_table) |
01fb4d3c | 1857 | { |
c7bf8758 VK |
1858 | if (unlikely(!opp_table)) |
1859 | return; | |
1860 | ||
2c2709dc VK |
1861 | /* Make sure there are no concurrent readers while updating opp_table */ |
1862 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
01fb4d3c | 1863 | |
2c2709dc VK |
1864 | kfree(opp_table->prop_name); |
1865 | opp_table->prop_name = NULL; | |
01fb4d3c | 1866 | |
fa30184d | 1867 | dev_pm_opp_put_opp_table(opp_table); |
01fb4d3c VK |
1868 | } |
1869 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); | |
1870 | ||
9f8ea969 | 1871 | /** |
dfbe4678 | 1872 | * dev_pm_opp_set_regulators() - Set regulator names for the device |
9f8ea969 | 1873 | * @dev: Device for which regulator name is being set. |
dfbe4678 VK |
1874 | * @names: Array of pointers to the names of the regulator. |
1875 | * @count: Number of regulators. | |
9f8ea969 VK |
1876 | * |
1877 | * In order to support OPP switching, OPP layer needs to know the name of the | |
dfbe4678 VK |
1878 | * device's regulators, as the core would be required to switch voltages as |
1879 | * well. | |
9f8ea969 VK |
1880 | * |
1881 | * This must be called before any OPPs are initialized for the device. | |
9f8ea969 | 1882 | */ |
dfbe4678 VK |
1883 | struct opp_table *dev_pm_opp_set_regulators(struct device *dev, |
1884 | const char * const names[], | |
1885 | unsigned int count) | |
9f8ea969 | 1886 | { |
38bb3439 | 1887 | struct dev_pm_opp_supply *supplies; |
2c2709dc | 1888 | struct opp_table *opp_table; |
9f8ea969 | 1889 | struct regulator *reg; |
dfbe4678 | 1890 | int ret, i; |
9f8ea969 | 1891 | |
32439ac7 | 1892 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
1893 | if (IS_ERR(opp_table)) |
1894 | return opp_table; | |
9f8ea969 VK |
1895 | |
1896 | /* This should be called before OPPs are initialized */ | |
2c2709dc | 1897 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { |
9f8ea969 VK |
1898 | ret = -EBUSY; |
1899 | goto err; | |
1900 | } | |
1901 | ||
779b783c VK |
1902 | /* Another CPU that shares the OPP table has set the regulators ? */ |
1903 | if (opp_table->regulators) | |
1904 | return opp_table; | |
dfbe4678 VK |
1905 | |
1906 | opp_table->regulators = kmalloc_array(count, | |
1907 | sizeof(*opp_table->regulators), | |
1908 | GFP_KERNEL); | |
1909 | if (!opp_table->regulators) { | |
1910 | ret = -ENOMEM; | |
9f8ea969 VK |
1911 | goto err; |
1912 | } | |
1913 | ||
dfbe4678 VK |
1914 | for (i = 0; i < count; i++) { |
1915 | reg = regulator_get_optional(dev, names[i]); | |
1916 | if (IS_ERR(reg)) { | |
1917 | ret = PTR_ERR(reg); | |
1918 | if (ret != -EPROBE_DEFER) | |
1919 | dev_err(dev, "%s: no regulator (%s) found: %d\n", | |
1920 | __func__, names[i], ret); | |
1921 | goto free_regulators; | |
1922 | } | |
1923 | ||
1924 | opp_table->regulators[i] = reg; | |
1925 | } | |
1926 | ||
1927 | opp_table->regulator_count = count; | |
9f8ea969 | 1928 | |
38bb3439 VK |
1929 | supplies = kmalloc_array(count * 2, sizeof(*supplies), GFP_KERNEL); |
1930 | if (!supplies) { | |
1931 | ret = -ENOMEM; | |
94735585 | 1932 | goto free_regulators; |
38bb3439 VK |
1933 | } |
1934 | ||
1935 | mutex_lock(&opp_table->lock); | |
1936 | opp_table->sod_supplies = supplies; | |
1937 | if (opp_table->set_opp_data) { | |
1938 | opp_table->set_opp_data->old_opp.supplies = supplies; | |
1939 | opp_table->set_opp_data->new_opp.supplies = supplies + count; | |
1940 | } | |
1941 | mutex_unlock(&opp_table->lock); | |
94735585 | 1942 | |
91291d9a | 1943 | return opp_table; |
9f8ea969 | 1944 | |
dfbe4678 | 1945 | free_regulators: |
24957db1 MS |
1946 | while (i != 0) |
1947 | regulator_put(opp_table->regulators[--i]); | |
dfbe4678 VK |
1948 | |
1949 | kfree(opp_table->regulators); | |
1950 | opp_table->regulators = NULL; | |
46f48aca | 1951 | opp_table->regulator_count = -1; |
9f8ea969 | 1952 | err: |
fa30184d | 1953 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 1954 | |
91291d9a | 1955 | return ERR_PTR(ret); |
9f8ea969 | 1956 | } |
dfbe4678 | 1957 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); |
9f8ea969 VK |
1958 | |
1959 | /** | |
dfbe4678 VK |
1960 | * dev_pm_opp_put_regulators() - Releases resources blocked for regulator |
1961 | * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). | |
9f8ea969 | 1962 | */ |
dfbe4678 | 1963 | void dev_pm_opp_put_regulators(struct opp_table *opp_table) |
9f8ea969 | 1964 | { |
dfbe4678 VK |
1965 | int i; |
1966 | ||
c7bf8758 VK |
1967 | if (unlikely(!opp_table)) |
1968 | return; | |
1969 | ||
779b783c VK |
1970 | if (!opp_table->regulators) |
1971 | goto put_opp_table; | |
9f8ea969 | 1972 | |
2c2709dc VK |
1973 | /* Make sure there are no concurrent readers while updating opp_table */ |
1974 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
9f8ea969 | 1975 | |
72f80ce4 | 1976 | if (opp_table->enabled) { |
8d45719c KK |
1977 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
1978 | regulator_disable(opp_table->regulators[i]); | |
8d45719c KK |
1979 | } |
1980 | ||
24957db1 | 1981 | for (i = opp_table->regulator_count - 1; i >= 0; i--) |
dfbe4678 VK |
1982 | regulator_put(opp_table->regulators[i]); |
1983 | ||
38bb3439 VK |
1984 | mutex_lock(&opp_table->lock); |
1985 | if (opp_table->set_opp_data) { | |
1986 | opp_table->set_opp_data->old_opp.supplies = NULL; | |
1987 | opp_table->set_opp_data->new_opp.supplies = NULL; | |
1988 | } | |
1989 | ||
1990 | kfree(opp_table->sod_supplies); | |
1991 | opp_table->sod_supplies = NULL; | |
1992 | mutex_unlock(&opp_table->lock); | |
94735585 | 1993 | |
dfbe4678 VK |
1994 | kfree(opp_table->regulators); |
1995 | opp_table->regulators = NULL; | |
46f48aca | 1996 | opp_table->regulator_count = -1; |
9f8ea969 | 1997 | |
779b783c | 1998 | put_opp_table: |
fa30184d | 1999 | dev_pm_opp_put_opp_table(opp_table); |
9f8ea969 | 2000 | } |
dfbe4678 | 2001 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); |
9f8ea969 | 2002 | |
829a4e8c VK |
2003 | /** |
2004 | * dev_pm_opp_set_clkname() - Set clk name for the device | |
2005 | * @dev: Device for which clk name is being set. | |
2006 | * @name: Clk name. | |
2007 | * | |
2008 | * In order to support OPP switching, OPP layer needs to get pointer to the | |
2009 | * clock for the device. Simple cases work fine without using this routine (i.e. | |
2010 | * by passing connection-id as NULL), but for a device with multiple clocks | |
2011 | * available, the OPP core needs to know the exact name of the clk to use. | |
2012 | * | |
2013 | * This must be called before any OPPs are initialized for the device. | |
2014 | */ | |
2015 | struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) | |
2016 | { | |
2017 | struct opp_table *opp_table; | |
2018 | int ret; | |
2019 | ||
32439ac7 | 2020 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
2021 | if (IS_ERR(opp_table)) |
2022 | return opp_table; | |
829a4e8c VK |
2023 | |
2024 | /* This should be called before OPPs are initialized */ | |
2025 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
2026 | ret = -EBUSY; | |
2027 | goto err; | |
2028 | } | |
2029 | ||
32439ac7 VK |
2030 | /* clk shouldn't be initialized at this point */ |
2031 | if (WARN_ON(opp_table->clk)) { | |
2032 | ret = -EBUSY; | |
2033 | goto err; | |
2034 | } | |
829a4e8c VK |
2035 | |
2036 | /* Find clk for the device */ | |
2037 | opp_table->clk = clk_get(dev, name); | |
2038 | if (IS_ERR(opp_table->clk)) { | |
2039 | ret = PTR_ERR(opp_table->clk); | |
2040 | if (ret != -EPROBE_DEFER) { | |
2041 | dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, | |
2042 | ret); | |
2043 | } | |
2044 | goto err; | |
2045 | } | |
2046 | ||
2047 | return opp_table; | |
2048 | ||
2049 | err: | |
2050 | dev_pm_opp_put_opp_table(opp_table); | |
2051 | ||
2052 | return ERR_PTR(ret); | |
2053 | } | |
2054 | EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); | |
2055 | ||
2056 | /** | |
2057 | * dev_pm_opp_put_clkname() - Releases resources blocked for clk. | |
2058 | * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). | |
2059 | */ | |
2060 | void dev_pm_opp_put_clkname(struct opp_table *opp_table) | |
2061 | { | |
c7bf8758 VK |
2062 | if (unlikely(!opp_table)) |
2063 | return; | |
2064 | ||
829a4e8c VK |
2065 | /* Make sure there are no concurrent readers while updating opp_table */ |
2066 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
2067 | ||
2068 | clk_put(opp_table->clk); | |
2069 | opp_table->clk = ERR_PTR(-EINVAL); | |
2070 | ||
2071 | dev_pm_opp_put_opp_table(opp_table); | |
2072 | } | |
2073 | EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); | |
2074 | ||
4dab160e VK |
2075 | /** |
2076 | * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
2077 | * @dev: Device for which the helper is getting registered. | |
2078 | * @set_opp: Custom set OPP helper. | |
2079 | * | |
2080 | * This is useful to support complex platforms (like platforms with multiple | |
2081 | * regulators per device), instead of the generic OPP set rate helper. | |
2082 | * | |
2083 | * This must be called before any OPPs are initialized for the device. | |
4dab160e | 2084 | */ |
fa30184d | 2085 | struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, |
4dab160e VK |
2086 | int (*set_opp)(struct dev_pm_set_opp_data *data)) |
2087 | { | |
38bb3439 | 2088 | struct dev_pm_set_opp_data *data; |
4dab160e | 2089 | struct opp_table *opp_table; |
4dab160e VK |
2090 | |
2091 | if (!set_opp) | |
fa30184d | 2092 | return ERR_PTR(-EINVAL); |
4dab160e | 2093 | |
32439ac7 | 2094 | opp_table = _add_opp_table(dev, false); |
47efcbcb | 2095 | if (IS_ERR(opp_table)) |
dd461cd9 | 2096 | return opp_table; |
4dab160e VK |
2097 | |
2098 | /* This should be called before OPPs are initialized */ | |
2099 | if (WARN_ON(!list_empty(&opp_table->opp_list))) { | |
5019acc6 VK |
2100 | dev_pm_opp_put_opp_table(opp_table); |
2101 | return ERR_PTR(-EBUSY); | |
4dab160e VK |
2102 | } |
2103 | ||
5019acc6 | 2104 | /* Another CPU that shares the OPP table has set the helper ? */ |
38bb3439 VK |
2105 | if (opp_table->set_opp) |
2106 | return opp_table; | |
2107 | ||
2108 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2109 | if (!data) | |
2110 | return ERR_PTR(-ENOMEM); | |
2111 | ||
2112 | mutex_lock(&opp_table->lock); | |
2113 | opp_table->set_opp_data = data; | |
2114 | if (opp_table->sod_supplies) { | |
2115 | data->old_opp.supplies = opp_table->sod_supplies; | |
2116 | data->new_opp.supplies = opp_table->sod_supplies + | |
2117 | opp_table->regulator_count; | |
2118 | } | |
2119 | mutex_unlock(&opp_table->lock); | |
2120 | ||
2121 | opp_table->set_opp = set_opp; | |
4dab160e | 2122 | |
fa30184d | 2123 | return opp_table; |
4dab160e VK |
2124 | } |
2125 | EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); | |
2126 | ||
2127 | /** | |
604a7aeb | 2128 | * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for |
4dab160e | 2129 | * set_opp helper |
fa30184d | 2130 | * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). |
4dab160e | 2131 | * |
fa30184d | 2132 | * Release resources blocked for platform specific set_opp helper. |
4dab160e | 2133 | */ |
604a7aeb | 2134 | void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) |
4dab160e | 2135 | { |
c7bf8758 VK |
2136 | if (unlikely(!opp_table)) |
2137 | return; | |
2138 | ||
4dab160e VK |
2139 | /* Make sure there are no concurrent readers while updating opp_table */ |
2140 | WARN_ON(!list_empty(&opp_table->opp_list)); | |
2141 | ||
2142 | opp_table->set_opp = NULL; | |
38bb3439 VK |
2143 | |
2144 | mutex_lock(&opp_table->lock); | |
2145 | kfree(opp_table->set_opp_data); | |
2146 | opp_table->set_opp_data = NULL; | |
2147 | mutex_unlock(&opp_table->lock); | |
2148 | ||
fa30184d | 2149 | dev_pm_opp_put_opp_table(opp_table); |
4dab160e | 2150 | } |
604a7aeb | 2151 | EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); |
4dab160e | 2152 | |
a3c47af6 DO |
2153 | static void devm_pm_opp_unregister_set_opp_helper(void *data) |
2154 | { | |
2155 | dev_pm_opp_unregister_set_opp_helper(data); | |
2156 | } | |
2157 | ||
2158 | /** | |
2159 | * devm_pm_opp_register_set_opp_helper() - Register custom set OPP helper | |
2160 | * @dev: Device for which the helper is getting registered. | |
2161 | * @set_opp: Custom set OPP helper. | |
2162 | * | |
2163 | * This is a resource-managed version of dev_pm_opp_register_set_opp_helper(). | |
2164 | * | |
2165 | * Return: pointer to 'struct opp_table' on success and errorno otherwise. | |
2166 | */ | |
2167 | struct opp_table * | |
2168 | devm_pm_opp_register_set_opp_helper(struct device *dev, | |
2169 | int (*set_opp)(struct dev_pm_set_opp_data *data)) | |
2170 | { | |
2171 | struct opp_table *opp_table; | |
2172 | int err; | |
2173 | ||
2174 | opp_table = dev_pm_opp_register_set_opp_helper(dev, set_opp); | |
2175 | if (IS_ERR(opp_table)) | |
2176 | return opp_table; | |
2177 | ||
2178 | err = devm_add_action_or_reset(dev, devm_pm_opp_unregister_set_opp_helper, | |
2179 | opp_table); | |
2180 | if (err) | |
2181 | return ERR_PTR(err); | |
2182 | ||
2183 | return opp_table; | |
2184 | } | |
2185 | EXPORT_SYMBOL_GPL(devm_pm_opp_register_set_opp_helper); | |
2186 | ||
6319aee1 VK |
2187 | static void _opp_detach_genpd(struct opp_table *opp_table) |
2188 | { | |
2189 | int index; | |
2190 | ||
cb60e960 VK |
2191 | if (!opp_table->genpd_virt_devs) |
2192 | return; | |
2193 | ||
6319aee1 VK |
2194 | for (index = 0; index < opp_table->required_opp_count; index++) { |
2195 | if (!opp_table->genpd_virt_devs[index]) | |
2196 | continue; | |
2197 | ||
2198 | dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false); | |
2199 | opp_table->genpd_virt_devs[index] = NULL; | |
2200 | } | |
c0ab9e08 VK |
2201 | |
2202 | kfree(opp_table->genpd_virt_devs); | |
2203 | opp_table->genpd_virt_devs = NULL; | |
6319aee1 VK |
2204 | } |
2205 | ||
4f018bc0 | 2206 | /** |
6319aee1 VK |
2207 | * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer |
2208 | * @dev: Consumer device for which the genpd is getting attached. | |
2209 | * @names: Null terminated array of pointers containing names of genpd to attach. | |
17a8f868 | 2210 | * @virt_devs: Pointer to return the array of virtual devices. |
4f018bc0 VK |
2211 | * |
2212 | * Multiple generic power domains for a device are supported with the help of | |
2213 | * virtual genpd devices, which are created for each consumer device - genpd | |
2214 | * pair. These are the device structures which are attached to the power domain | |
2215 | * and are required by the OPP core to set the performance state of the genpd. | |
6319aee1 VK |
2216 | * The same API also works for the case where single genpd is available and so |
2217 | * we don't need to support that separately. | |
4f018bc0 VK |
2218 | * |
2219 | * This helper will normally be called by the consumer driver of the device | |
6319aee1 | 2220 | * "dev", as only that has details of the genpd names. |
4f018bc0 | 2221 | * |
6319aee1 VK |
2222 | * This helper needs to be called once with a list of all genpd to attach. |
2223 | * Otherwise the original device structure will be used instead by the OPP core. | |
baea35e4 VK |
2224 | * |
2225 | * The order of entries in the names array must match the order in which | |
2226 | * "required-opps" are added in DT. | |
4f018bc0 | 2227 | */ |
17a8f868 VK |
2228 | struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, |
2229 | const char **names, struct device ***virt_devs) | |
4f018bc0 VK |
2230 | { |
2231 | struct opp_table *opp_table; | |
6319aee1 | 2232 | struct device *virt_dev; |
baea35e4 | 2233 | int index = 0, ret = -EINVAL; |
6319aee1 | 2234 | const char **name = names; |
4f018bc0 | 2235 | |
32439ac7 | 2236 | opp_table = _add_opp_table(dev, false); |
dd461cd9 SG |
2237 | if (IS_ERR(opp_table)) |
2238 | return opp_table; | |
4f018bc0 | 2239 | |
cb60e960 VK |
2240 | if (opp_table->genpd_virt_devs) |
2241 | return opp_table; | |
4f018bc0 | 2242 | |
6319aee1 VK |
2243 | /* |
2244 | * If the genpd's OPP table isn't already initialized, parsing of the | |
2245 | * required-opps fail for dev. We should retry this after genpd's OPP | |
2246 | * table is added. | |
2247 | */ | |
2248 | if (!opp_table->required_opp_count) { | |
2249 | ret = -EPROBE_DEFER; | |
2250 | goto put_table; | |
2251 | } | |
2252 | ||
4f018bc0 VK |
2253 | mutex_lock(&opp_table->genpd_virt_dev_lock); |
2254 | ||
c0ab9e08 VK |
2255 | opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count, |
2256 | sizeof(*opp_table->genpd_virt_devs), | |
2257 | GFP_KERNEL); | |
2258 | if (!opp_table->genpd_virt_devs) | |
2259 | goto unlock; | |
4f018bc0 | 2260 | |
6319aee1 | 2261 | while (*name) { |
6319aee1 VK |
2262 | if (index >= opp_table->required_opp_count) { |
2263 | dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n", | |
2264 | *name, opp_table->required_opp_count, index); | |
2265 | goto err; | |
2266 | } | |
4f018bc0 | 2267 | |
6319aee1 VK |
2268 | virt_dev = dev_pm_domain_attach_by_name(dev, *name); |
2269 | if (IS_ERR(virt_dev)) { | |
2270 | ret = PTR_ERR(virt_dev); | |
2271 | dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret); | |
2272 | goto err; | |
2273 | } | |
2274 | ||
2275 | opp_table->genpd_virt_devs[index] = virt_dev; | |
baea35e4 | 2276 | index++; |
6319aee1 | 2277 | name++; |
4f018bc0 VK |
2278 | } |
2279 | ||
17a8f868 VK |
2280 | if (virt_devs) |
2281 | *virt_devs = opp_table->genpd_virt_devs; | |
4f018bc0 VK |
2282 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2283 | ||
2284 | return opp_table; | |
6319aee1 VK |
2285 | |
2286 | err: | |
2287 | _opp_detach_genpd(opp_table); | |
c0ab9e08 | 2288 | unlock: |
6319aee1 VK |
2289 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2290 | ||
2291 | put_table: | |
2292 | dev_pm_opp_put_opp_table(opp_table); | |
2293 | ||
2294 | return ERR_PTR(ret); | |
4f018bc0 | 2295 | } |
6319aee1 | 2296 | EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd); |
4f018bc0 VK |
2297 | |
2298 | /** | |
6319aee1 VK |
2299 | * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device. |
2300 | * @opp_table: OPP table returned by dev_pm_opp_attach_genpd(). | |
4f018bc0 | 2301 | * |
6319aee1 VK |
2302 | * This detaches the genpd(s), resets the virtual device pointers, and puts the |
2303 | * OPP table. | |
4f018bc0 | 2304 | */ |
6319aee1 | 2305 | void dev_pm_opp_detach_genpd(struct opp_table *opp_table) |
4f018bc0 | 2306 | { |
c7bf8758 VK |
2307 | if (unlikely(!opp_table)) |
2308 | return; | |
2309 | ||
4f018bc0 VK |
2310 | /* |
2311 | * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting | |
2312 | * used in parallel. | |
2313 | */ | |
2314 | mutex_lock(&opp_table->genpd_virt_dev_lock); | |
6319aee1 | 2315 | _opp_detach_genpd(opp_table); |
4f018bc0 VK |
2316 | mutex_unlock(&opp_table->genpd_virt_dev_lock); |
2317 | ||
6319aee1 | 2318 | dev_pm_opp_put_opp_table(opp_table); |
4f018bc0 | 2319 | } |
6319aee1 | 2320 | EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd); |
4f018bc0 | 2321 | |
b4b9e223 DO |
2322 | static void devm_pm_opp_detach_genpd(void *data) |
2323 | { | |
2324 | dev_pm_opp_detach_genpd(data); | |
2325 | } | |
2326 | ||
2327 | /** | |
2328 | * devm_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual | |
2329 | * 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. | |
2332 | * @virt_devs: Pointer to return the array of virtual devices. | |
2333 | * | |
2334 | * This is a resource-managed version of dev_pm_opp_attach_genpd(). | |
2335 | * | |
2336 | * Return: pointer to 'struct opp_table' on success and errorno otherwise. | |
2337 | */ | |
2338 | struct opp_table * | |
2339 | devm_pm_opp_attach_genpd(struct device *dev, const char **names, | |
2340 | struct device ***virt_devs) | |
2341 | { | |
2342 | struct opp_table *opp_table; | |
2343 | int err; | |
2344 | ||
2345 | opp_table = dev_pm_opp_attach_genpd(dev, names, virt_devs); | |
2346 | if (IS_ERR(opp_table)) | |
2347 | return opp_table; | |
2348 | ||
2349 | err = devm_add_action_or_reset(dev, devm_pm_opp_detach_genpd, | |
2350 | opp_table); | |
2351 | if (err) | |
2352 | return ERR_PTR(err); | |
2353 | ||
2354 | return opp_table; | |
2355 | } | |
2356 | EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd); | |
2357 | ||
c8a59103 VK |
2358 | /** |
2359 | * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. | |
2360 | * @src_table: OPP table which has dst_table as one of its required OPP table. | |
2361 | * @dst_table: Required OPP table of the src_table. | |
2362 | * @pstate: Current performance state of the src_table. | |
2363 | * | |
2364 | * This Returns pstate of the OPP (present in @dst_table) pointed out by the | |
2365 | * "required-opps" property of the OPP (present in @src_table) which has | |
2366 | * performance state set to @pstate. | |
2367 | * | |
2368 | * Return: Zero or positive performance state on success, otherwise negative | |
2369 | * value on errors. | |
2370 | */ | |
2371 | int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, | |
2372 | struct opp_table *dst_table, | |
2373 | unsigned int pstate) | |
2374 | { | |
2375 | struct dev_pm_opp *opp; | |
2376 | int dest_pstate = -EINVAL; | |
2377 | int i; | |
2378 | ||
c8a59103 VK |
2379 | /* |
2380 | * Normally the src_table will have the "required_opps" property set to | |
2381 | * point to one of the OPPs in the dst_table, but in some cases the | |
2382 | * genpd and its master have one to one mapping of performance states | |
2383 | * and so none of them have the "required-opps" property set. Return the | |
2384 | * pstate of the src_table as it is in such cases. | |
2385 | */ | |
f2f4d2b8 | 2386 | if (!src_table || !src_table->required_opp_count) |
c8a59103 VK |
2387 | return pstate; |
2388 | ||
2389 | for (i = 0; i < src_table->required_opp_count; i++) { | |
2390 | if (src_table->required_opp_tables[i]->np == dst_table->np) | |
2391 | break; | |
2392 | } | |
2393 | ||
2394 | if (unlikely(i == src_table->required_opp_count)) { | |
2395 | pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", | |
2396 | __func__, src_table, dst_table); | |
2397 | return -EINVAL; | |
2398 | } | |
2399 | ||
2400 | mutex_lock(&src_table->lock); | |
2401 | ||
2402 | list_for_each_entry(opp, &src_table->opp_list, node) { | |
2403 | if (opp->pstate == pstate) { | |
2404 | dest_pstate = opp->required_opps[i]->pstate; | |
2405 | goto unlock; | |
2406 | } | |
2407 | } | |
2408 | ||
2409 | pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, | |
2410 | dst_table); | |
2411 | ||
2412 | unlock: | |
2413 | mutex_unlock(&src_table->lock); | |
2414 | ||
2415 | return dest_pstate; | |
2416 | } | |
2417 | ||
38393409 VK |
2418 | /** |
2419 | * dev_pm_opp_add() - Add an OPP table from a table definitions | |
2420 | * @dev: device for which we do this operation | |
2421 | * @freq: Frequency in Hz for this OPP | |
2422 | * @u_volt: Voltage in uVolts for this OPP | |
2423 | * | |
2c2709dc | 2424 | * This function adds an opp definition to the opp table and returns status. |
38393409 VK |
2425 | * The opp is made available by default and it can be controlled using |
2426 | * dev_pm_opp_enable/disable functions. | |
2427 | * | |
38393409 | 2428 | * Return: |
984f16c8 | 2429 | * 0 On success OR |
38393409 | 2430 | * Duplicate OPPs (both freq and volt are same) and opp->available |
984f16c8 | 2431 | * -EEXIST Freq are same and volt are different OR |
38393409 | 2432 | * Duplicate OPPs (both freq and volt are same) and !opp->available |
984f16c8 | 2433 | * -ENOMEM Memory allocation failure |
38393409 VK |
2434 | */ |
2435 | int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) | |
2436 | { | |
8cd2f6e8 VK |
2437 | struct opp_table *opp_table; |
2438 | int ret; | |
2439 | ||
32439ac7 | 2440 | opp_table = _add_opp_table(dev, true); |
dd461cd9 SG |
2441 | if (IS_ERR(opp_table)) |
2442 | return PTR_ERR(opp_table); | |
8cd2f6e8 | 2443 | |
46f48aca VK |
2444 | /* Fix regulator count for dynamic OPPs */ |
2445 | opp_table->regulator_count = 1; | |
2446 | ||
8cd2f6e8 | 2447 | ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); |
0ad8c623 VK |
2448 | if (ret) |
2449 | dev_pm_opp_put_opp_table(opp_table); | |
8cd2f6e8 | 2450 | |
8cd2f6e8 | 2451 | return ret; |
38393409 | 2452 | } |
5d4879cd | 2453 | EXPORT_SYMBOL_GPL(dev_pm_opp_add); |
e1f60b29 NM |
2454 | |
2455 | /** | |
327854c8 | 2456 | * _opp_set_availability() - helper to set the availability of an opp |
e1f60b29 NM |
2457 | * @dev: device for which we do this operation |
2458 | * @freq: OPP frequency to modify availability | |
2459 | * @availability_req: availability status requested for this opp | |
2460 | * | |
052c6f19 VK |
2461 | * Set the availability of an OPP, opp_{enable,disable} share a common logic |
2462 | * which is isolated here. | |
e1f60b29 | 2463 | * |
984f16c8 | 2464 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2465 | * copy operation, returns 0 if no modification was done OR modification was |
e1f60b29 | 2466 | * successful. |
e1f60b29 | 2467 | */ |
327854c8 NM |
2468 | static int _opp_set_availability(struct device *dev, unsigned long freq, |
2469 | bool availability_req) | |
e1f60b29 | 2470 | { |
2c2709dc | 2471 | struct opp_table *opp_table; |
a7f3987e | 2472 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); |
e1f60b29 NM |
2473 | int r = 0; |
2474 | ||
2c2709dc VK |
2475 | /* Find the opp_table */ |
2476 | opp_table = _find_opp_table(dev); | |
2477 | if (IS_ERR(opp_table)) { | |
2478 | r = PTR_ERR(opp_table); | |
e1f60b29 | 2479 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); |
a7f3987e | 2480 | return r; |
e1f60b29 NM |
2481 | } |
2482 | ||
37a73ec0 VK |
2483 | mutex_lock(&opp_table->lock); |
2484 | ||
e1f60b29 | 2485 | /* Do we have the frequency? */ |
2c2709dc | 2486 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { |
e1f60b29 NM |
2487 | if (tmp_opp->rate == freq) { |
2488 | opp = tmp_opp; | |
2489 | break; | |
2490 | } | |
2491 | } | |
37a73ec0 | 2492 | |
e1f60b29 NM |
2493 | if (IS_ERR(opp)) { |
2494 | r = PTR_ERR(opp); | |
2495 | goto unlock; | |
2496 | } | |
2497 | ||
2498 | /* Is update really needed? */ | |
2499 | if (opp->available == availability_req) | |
2500 | goto unlock; | |
e1f60b29 | 2501 | |
a7f3987e | 2502 | opp->available = availability_req; |
e1f60b29 | 2503 | |
e4d8ae00 VK |
2504 | dev_pm_opp_get(opp); |
2505 | mutex_unlock(&opp_table->lock); | |
2506 | ||
03ca370f MH |
2507 | /* Notify the change of the OPP availability */ |
2508 | if (availability_req) | |
052c6f19 | 2509 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, |
a7f3987e | 2510 | opp); |
03ca370f | 2511 | else |
052c6f19 | 2512 | blocking_notifier_call_chain(&opp_table->head, |
a7f3987e | 2513 | OPP_EVENT_DISABLE, opp); |
e1f60b29 | 2514 | |
e4d8ae00 VK |
2515 | dev_pm_opp_put(opp); |
2516 | goto put_table; | |
2517 | ||
e1f60b29 | 2518 | unlock: |
5b650b38 | 2519 | mutex_unlock(&opp_table->lock); |
e4d8ae00 | 2520 | put_table: |
5b650b38 | 2521 | dev_pm_opp_put_opp_table(opp_table); |
e1f60b29 NM |
2522 | return r; |
2523 | } | |
2524 | ||
25cb20a2 SB |
2525 | /** |
2526 | * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP | |
2527 | * @dev: device for which we do this operation | |
2528 | * @freq: OPP frequency to adjust voltage of | |
2529 | * @u_volt: new OPP target voltage | |
2530 | * @u_volt_min: new OPP min voltage | |
2531 | * @u_volt_max: new OPP max voltage | |
2532 | * | |
2533 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the | |
2534 | * copy operation, returns 0 if no modifcation was done OR modification was | |
2535 | * successful. | |
2536 | */ | |
2537 | int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, | |
2538 | unsigned long u_volt, unsigned long u_volt_min, | |
2539 | unsigned long u_volt_max) | |
2540 | ||
2541 | { | |
2542 | struct opp_table *opp_table; | |
2543 | struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); | |
2544 | int r = 0; | |
2545 | ||
2546 | /* Find the opp_table */ | |
2547 | opp_table = _find_opp_table(dev); | |
2548 | if (IS_ERR(opp_table)) { | |
2549 | r = PTR_ERR(opp_table); | |
2550 | dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); | |
2551 | return r; | |
2552 | } | |
2553 | ||
2554 | mutex_lock(&opp_table->lock); | |
2555 | ||
2556 | /* Do we have the frequency? */ | |
2557 | list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { | |
2558 | if (tmp_opp->rate == freq) { | |
2559 | opp = tmp_opp; | |
2560 | break; | |
2561 | } | |
2562 | } | |
2563 | ||
2564 | if (IS_ERR(opp)) { | |
2565 | r = PTR_ERR(opp); | |
2566 | goto adjust_unlock; | |
2567 | } | |
2568 | ||
2569 | /* Is update really needed? */ | |
2570 | if (opp->supplies->u_volt == u_volt) | |
2571 | goto adjust_unlock; | |
2572 | ||
2573 | opp->supplies->u_volt = u_volt; | |
2574 | opp->supplies->u_volt_min = u_volt_min; | |
2575 | opp->supplies->u_volt_max = u_volt_max; | |
2576 | ||
2577 | dev_pm_opp_get(opp); | |
2578 | mutex_unlock(&opp_table->lock); | |
2579 | ||
2580 | /* Notify the voltage change of the OPP */ | |
2581 | blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE, | |
2582 | opp); | |
2583 | ||
2584 | dev_pm_opp_put(opp); | |
2585 | goto adjust_put_table; | |
2586 | ||
2587 | adjust_unlock: | |
2588 | mutex_unlock(&opp_table->lock); | |
2589 | adjust_put_table: | |
2590 | dev_pm_opp_put_opp_table(opp_table); | |
2591 | return r; | |
2592 | } | |
03649154 | 2593 | EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage); |
25cb20a2 | 2594 | |
e1f60b29 | 2595 | /** |
5d4879cd | 2596 | * dev_pm_opp_enable() - Enable a specific OPP |
e1f60b29 NM |
2597 | * @dev: device for which we do this operation |
2598 | * @freq: OPP frequency to enable | |
2599 | * | |
2600 | * Enables a provided opp. If the operation is valid, this returns 0, else the | |
2601 | * corresponding error value. It is meant to be used for users an OPP available | |
5d4879cd | 2602 | * after being temporarily made unavailable with dev_pm_opp_disable. |
e1f60b29 | 2603 | * |
984f16c8 | 2604 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2605 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2606 | * successful. |
e1f60b29 | 2607 | */ |
5d4879cd | 2608 | int dev_pm_opp_enable(struct device *dev, unsigned long freq) |
e1f60b29 | 2609 | { |
327854c8 | 2610 | return _opp_set_availability(dev, freq, true); |
e1f60b29 | 2611 | } |
5d4879cd | 2612 | EXPORT_SYMBOL_GPL(dev_pm_opp_enable); |
e1f60b29 NM |
2613 | |
2614 | /** | |
5d4879cd | 2615 | * dev_pm_opp_disable() - Disable a specific OPP |
e1f60b29 NM |
2616 | * @dev: device for which we do this operation |
2617 | * @freq: OPP frequency to disable | |
2618 | * | |
2619 | * Disables a provided opp. If the operation is valid, this returns | |
2620 | * 0, else the corresponding error value. It is meant to be a temporary | |
2621 | * control by users to make this OPP not available until the circumstances are | |
5d4879cd | 2622 | * right to make it available again (with a call to dev_pm_opp_enable). |
e1f60b29 | 2623 | * |
984f16c8 | 2624 | * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the |
e1a2d49c | 2625 | * copy operation, returns 0 if no modification was done OR modification was |
984f16c8 | 2626 | * successful. |
e1f60b29 | 2627 | */ |
5d4879cd | 2628 | int dev_pm_opp_disable(struct device *dev, unsigned long freq) |
e1f60b29 | 2629 | { |
327854c8 | 2630 | return _opp_set_availability(dev, freq, false); |
e1f60b29 | 2631 | } |
5d4879cd | 2632 | EXPORT_SYMBOL_GPL(dev_pm_opp_disable); |
e1f60b29 | 2633 | |
03ca370f | 2634 | /** |
dc2c9ad5 VK |
2635 | * dev_pm_opp_register_notifier() - Register OPP notifier for the device |
2636 | * @dev: Device for which notifier needs to be registered | |
2637 | * @nb: Notifier block to be registered | |
984f16c8 | 2638 | * |
dc2c9ad5 VK |
2639 | * Return: 0 on success or a negative error value. |
2640 | */ | |
2641 | int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) | |
2642 | { | |
2643 | struct opp_table *opp_table; | |
2644 | int ret; | |
2645 | ||
dc2c9ad5 | 2646 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2647 | if (IS_ERR(opp_table)) |
2648 | return PTR_ERR(opp_table); | |
2649 | ||
052c6f19 | 2650 | ret = blocking_notifier_chain_register(&opp_table->head, nb); |
dc2c9ad5 | 2651 | |
5b650b38 | 2652 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2653 | |
2654 | return ret; | |
2655 | } | |
2656 | EXPORT_SYMBOL(dev_pm_opp_register_notifier); | |
2657 | ||
2658 | /** | |
2659 | * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device | |
2660 | * @dev: Device for which notifier needs to be unregistered | |
2661 | * @nb: Notifier block to be unregistered | |
984f16c8 | 2662 | * |
dc2c9ad5 | 2663 | * Return: 0 on success or a negative error value. |
03ca370f | 2664 | */ |
dc2c9ad5 VK |
2665 | int dev_pm_opp_unregister_notifier(struct device *dev, |
2666 | struct notifier_block *nb) | |
03ca370f | 2667 | { |
dc2c9ad5 VK |
2668 | struct opp_table *opp_table; |
2669 | int ret; | |
03ca370f | 2670 | |
dc2c9ad5 | 2671 | opp_table = _find_opp_table(dev); |
5b650b38 VK |
2672 | if (IS_ERR(opp_table)) |
2673 | return PTR_ERR(opp_table); | |
dc2c9ad5 | 2674 | |
052c6f19 | 2675 | ret = blocking_notifier_chain_unregister(&opp_table->head, nb); |
03ca370f | 2676 | |
5b650b38 | 2677 | dev_pm_opp_put_opp_table(opp_table); |
dc2c9ad5 VK |
2678 | |
2679 | return ret; | |
03ca370f | 2680 | } |
dc2c9ad5 | 2681 | EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); |
b496dfbc | 2682 | |
8aaf6264 VK |
2683 | /** |
2684 | * dev_pm_opp_remove_table() - Free all OPPs associated with the device | |
2685 | * @dev: device pointer used to lookup OPP table. | |
2686 | * | |
2687 | * Free both OPPs created using static entries present in DT and the | |
2688 | * dynamically added entries. | |
2689 | */ | |
2690 | void dev_pm_opp_remove_table(struct device *dev) | |
9274c892 VK |
2691 | { |
2692 | struct opp_table *opp_table; | |
2693 | ||
2c2709dc VK |
2694 | /* Check for existing table for 'dev' */ |
2695 | opp_table = _find_opp_table(dev); | |
2696 | if (IS_ERR(opp_table)) { | |
2697 | int error = PTR_ERR(opp_table); | |
737002b5 VK |
2698 | |
2699 | if (error != -ENODEV) | |
2c2709dc | 2700 | WARN(1, "%s: opp_table: %d\n", |
737002b5 VK |
2701 | IS_ERR_OR_NULL(dev) ? |
2702 | "Invalid device" : dev_name(dev), | |
2703 | error); | |
5b650b38 | 2704 | return; |
737002b5 VK |
2705 | } |
2706 | ||
922ff075 VK |
2707 | /* |
2708 | * Drop the extra reference only if the OPP table was successfully added | |
2709 | * with dev_pm_opp_of_add_table() earlier. | |
2710 | **/ | |
2711 | if (_opp_remove_all_static(opp_table)) | |
2712 | dev_pm_opp_put_opp_table(opp_table); | |
cdd6ed90 VK |
2713 | |
2714 | /* Drop reference taken by _find_opp_table() */ | |
2715 | dev_pm_opp_put_opp_table(opp_table); | |
737002b5 | 2716 | } |
411466c5 | 2717 | EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |
ce8073d8 DO |
2718 | |
2719 | /** | |
2720 | * dev_pm_opp_sync_regulators() - Sync state of voltage regulators | |
2721 | * @dev: device for which we do this operation | |
2722 | * | |
2723 | * Sync voltage state of the OPP table regulators. | |
2724 | * | |
2725 | * Return: 0 on success or a negative error value. | |
2726 | */ | |
2727 | int dev_pm_opp_sync_regulators(struct device *dev) | |
2728 | { | |
2729 | struct opp_table *opp_table; | |
2730 | struct regulator *reg; | |
2731 | int i, ret = 0; | |
2732 | ||
2733 | /* Device may not have OPP table */ | |
2734 | opp_table = _find_opp_table(dev); | |
2735 | if (IS_ERR(opp_table)) | |
2736 | return 0; | |
2737 | ||
2738 | /* Regulator may not be required for the device */ | |
2739 | if (unlikely(!opp_table->regulators)) | |
2740 | goto put_table; | |
2741 | ||
2742 | /* Nothing to sync if voltage wasn't changed */ | |
2743 | if (!opp_table->enabled) | |
2744 | goto put_table; | |
2745 | ||
2746 | for (i = 0; i < opp_table->regulator_count; i++) { | |
2747 | reg = opp_table->regulators[i]; | |
2748 | ret = regulator_sync_voltage(reg); | |
2749 | if (ret) | |
2750 | break; | |
2751 | } | |
2752 | put_table: | |
2753 | /* Drop reference taken by _find_opp_table() */ | |
2754 | dev_pm_opp_put_opp_table(opp_table); | |
2755 | ||
2756 | return ret; | |
2757 | } | |
2758 | EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators); |