1 // SPDX-License-Identifier: GPL-2.0-only
3 * Generic OPP Interface
5 * Copyright (C) 2009-2010 Texas Instruments Incorporated.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/clk.h>
14 #include <linux/errno.h>
15 #include <linux/err.h>
16 #include <linux/slab.h>
17 #include <linux/device.h>
18 #include <linux/export.h>
19 #include <linux/pm_domain.h>
20 #include <linux/regulator/consumer.h>
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
27 * various states of availability.
29 LIST_HEAD(opp_tables);
31 /* OPP tables with uninitialized required OPPs */
32 LIST_HEAD(lazy_opp_tables);
34 /* Lock to allow exclusive modification to the device and opp lists */
35 DEFINE_MUTEX(opp_table_lock);
36 /* Flag indicating that opp_tables list is being updated at the moment */
37 static bool opp_tables_busy;
39 static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table)
41 struct opp_device *opp_dev;
44 mutex_lock(&opp_table->lock);
45 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
46 if (opp_dev->dev == dev) {
51 mutex_unlock(&opp_table->lock);
55 static struct opp_table *_find_opp_table_unlocked(struct device *dev)
57 struct opp_table *opp_table;
59 list_for_each_entry(opp_table, &opp_tables, node) {
60 if (_find_opp_dev(dev, opp_table)) {
61 _get_opp_table_kref(opp_table);
66 return ERR_PTR(-ENODEV);
70 * _find_opp_table() - find opp_table struct using device pointer
71 * @dev: device pointer used to lookup OPP table
73 * Search OPP table for one containing matching device.
75 * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
76 * -EINVAL based on type of error.
78 * The callers must call dev_pm_opp_put_opp_table() after the table is used.
80 struct opp_table *_find_opp_table(struct device *dev)
82 struct opp_table *opp_table;
84 if (IS_ERR_OR_NULL(dev)) {
85 pr_err("%s: Invalid parameters\n", __func__);
86 return ERR_PTR(-EINVAL);
89 mutex_lock(&opp_table_lock);
90 opp_table = _find_opp_table_unlocked(dev);
91 mutex_unlock(&opp_table_lock);
97 * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
98 * @opp: opp for which voltage has to be returned for
100 * Return: voltage in micro volt corresponding to the opp, else
103 * This is useful only for devices with single power supply.
105 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
107 if (IS_ERR_OR_NULL(opp)) {
108 pr_err("%s: Invalid parameters\n", __func__);
112 return opp->supplies[0].u_volt;
114 EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
117 * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
118 * @opp: opp for which frequency has to be returned for
120 * Return: frequency in hertz corresponding to the opp, else
123 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
125 if (IS_ERR_OR_NULL(opp)) {
126 pr_err("%s: Invalid parameters\n", __func__);
132 EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
135 * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
136 * @opp: opp for which level value has to be returned for
138 * Return: level read from device tree corresponding to the opp, else
141 unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
143 if (IS_ERR_OR_NULL(opp) || !opp->available) {
144 pr_err("%s: Invalid parameters\n", __func__);
150 EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
153 * dev_pm_opp_get_required_pstate() - Gets the required performance state
154 * corresponding to an available opp
155 * @opp: opp for which performance state has to be returned for
156 * @index: index of the required opp
158 * Return: performance state read from device tree corresponding to the
159 * required opp, else return 0.
161 unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
164 if (IS_ERR_OR_NULL(opp) || !opp->available ||
165 index >= opp->opp_table->required_opp_count) {
166 pr_err("%s: Invalid parameters\n", __func__);
170 /* required-opps not fully initialized yet */
171 if (lazy_linking_pending(opp->opp_table))
174 return opp->required_opps[index]->pstate;
176 EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
179 * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
180 * @opp: opp for which turbo mode is being verified
182 * Turbo OPPs are not for normal use, and can be enabled (under certain
183 * conditions) for short duration of times to finish high throughput work
184 * quickly. Running on them for longer times may overheat the chip.
186 * Return: true if opp is turbo opp, else false.
188 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
190 if (IS_ERR_OR_NULL(opp) || !opp->available) {
191 pr_err("%s: Invalid parameters\n", __func__);
197 EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
200 * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
201 * @dev: device for which we do this operation
203 * Return: This function returns the max clock latency in nanoseconds.
205 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
207 struct opp_table *opp_table;
208 unsigned long clock_latency_ns;
210 opp_table = _find_opp_table(dev);
211 if (IS_ERR(opp_table))
214 clock_latency_ns = opp_table->clock_latency_ns_max;
216 dev_pm_opp_put_opp_table(opp_table);
218 return clock_latency_ns;
220 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
223 * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
224 * @dev: device for which we do this operation
226 * Return: This function returns the max voltage latency in nanoseconds.
228 unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
230 struct opp_table *opp_table;
231 struct dev_pm_opp *opp;
232 struct regulator *reg;
233 unsigned long latency_ns = 0;
240 opp_table = _find_opp_table(dev);
241 if (IS_ERR(opp_table))
244 /* Regulator may not be required for the device */
245 if (!opp_table->regulators)
248 count = opp_table->regulator_count;
250 uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
254 mutex_lock(&opp_table->lock);
256 for (i = 0; i < count; i++) {
260 list_for_each_entry(opp, &opp_table->opp_list, node) {
264 if (opp->supplies[i].u_volt_min < uV[i].min)
265 uV[i].min = opp->supplies[i].u_volt_min;
266 if (opp->supplies[i].u_volt_max > uV[i].max)
267 uV[i].max = opp->supplies[i].u_volt_max;
271 mutex_unlock(&opp_table->lock);
274 * The caller needs to ensure that opp_table (and hence the regulator)
275 * isn't freed, while we are executing this routine.
277 for (i = 0; i < count; i++) {
278 reg = opp_table->regulators[i];
279 ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
281 latency_ns += ret * 1000;
286 dev_pm_opp_put_opp_table(opp_table);
290 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
293 * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
295 * @dev: device for which we do this operation
297 * Return: This function returns the max transition latency, in nanoseconds, to
298 * switch from one OPP to other.
300 unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
302 return dev_pm_opp_get_max_volt_latency(dev) +
303 dev_pm_opp_get_max_clock_latency(dev);
305 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
308 * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
309 * @dev: device for which we do this operation
311 * Return: This function returns the frequency of the OPP marked as suspend_opp
312 * if one is available, else returns 0;
314 unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
316 struct opp_table *opp_table;
317 unsigned long freq = 0;
319 opp_table = _find_opp_table(dev);
320 if (IS_ERR(opp_table))
323 if (opp_table->suspend_opp && opp_table->suspend_opp->available)
324 freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
326 dev_pm_opp_put_opp_table(opp_table);
330 EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
332 int _get_opp_count(struct opp_table *opp_table)
334 struct dev_pm_opp *opp;
337 mutex_lock(&opp_table->lock);
339 list_for_each_entry(opp, &opp_table->opp_list, node) {
344 mutex_unlock(&opp_table->lock);
350 * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
351 * @dev: device for which we do this operation
353 * Return: This function returns the number of available opps if there are any,
354 * else returns 0 if none or the corresponding error value.
356 int dev_pm_opp_get_opp_count(struct device *dev)
358 struct opp_table *opp_table;
361 opp_table = _find_opp_table(dev);
362 if (IS_ERR(opp_table)) {
363 count = PTR_ERR(opp_table);
364 dev_dbg(dev, "%s: OPP table not found (%d)\n",
369 count = _get_opp_count(opp_table);
370 dev_pm_opp_put_opp_table(opp_table);
374 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
377 * dev_pm_opp_find_freq_exact() - search for an exact frequency
378 * @dev: device for which we do this operation
379 * @freq: frequency to search for
380 * @available: true/false - match for available opp
382 * Return: Searches for exact match in the opp table and returns pointer to the
383 * matching opp if found, else returns ERR_PTR in case of error and should
384 * be handled using IS_ERR. Error return values can be:
385 * EINVAL: for bad pointer
386 * ERANGE: no match found for search
387 * ENODEV: if device not found in list of registered devices
389 * Note: available is a modifier for the search. if available=true, then the
390 * match is for exact matching frequency and is available in the stored OPP
391 * table. if false, the match is for exact frequency which is not available.
393 * This provides a mechanism to enable an opp which is not available currently
394 * or the opposite as well.
396 * The callers are required to call dev_pm_opp_put() for the returned OPP after
399 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
403 struct opp_table *opp_table;
404 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
406 opp_table = _find_opp_table(dev);
407 if (IS_ERR(opp_table)) {
408 int r = PTR_ERR(opp_table);
410 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
414 mutex_lock(&opp_table->lock);
416 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
417 if (temp_opp->available == available &&
418 temp_opp->rate == freq) {
421 /* Increment the reference count of OPP */
427 mutex_unlock(&opp_table->lock);
428 dev_pm_opp_put_opp_table(opp_table);
432 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
435 * dev_pm_opp_find_level_exact() - search for an exact level
436 * @dev: device for which we do this operation
437 * @level: level to search for
439 * Return: Searches for exact match in the opp table and returns pointer to the
440 * matching opp if found, else returns ERR_PTR in case of error and should
441 * be handled using IS_ERR. Error return values can be:
442 * EINVAL: for bad pointer
443 * ERANGE: no match found for search
444 * ENODEV: if device not found in list of registered devices
446 * The callers are required to call dev_pm_opp_put() for the returned OPP after
449 struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
452 struct opp_table *opp_table;
453 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
455 opp_table = _find_opp_table(dev);
456 if (IS_ERR(opp_table)) {
457 int r = PTR_ERR(opp_table);
459 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
463 mutex_lock(&opp_table->lock);
465 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
466 if (temp_opp->level == level) {
469 /* Increment the reference count of OPP */
475 mutex_unlock(&opp_table->lock);
476 dev_pm_opp_put_opp_table(opp_table);
480 EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
483 * dev_pm_opp_find_level_ceil() - search for an rounded up level
484 * @dev: device for which we do this operation
485 * @level: level to search for
487 * Return: Searches for rounded up match in the opp table and returns pointer
488 * to the matching opp if found, else returns ERR_PTR in case of error and
489 * should be handled using IS_ERR. Error return values can be:
490 * EINVAL: for bad pointer
491 * ERANGE: no match found for search
492 * ENODEV: if device not found in list of registered devices
494 * The callers are required to call dev_pm_opp_put() for the returned OPP after
497 struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
500 struct opp_table *opp_table;
501 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
503 opp_table = _find_opp_table(dev);
504 if (IS_ERR(opp_table)) {
505 int r = PTR_ERR(opp_table);
507 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
511 mutex_lock(&opp_table->lock);
513 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
514 if (temp_opp->available && temp_opp->level >= *level) {
518 /* Increment the reference count of OPP */
524 mutex_unlock(&opp_table->lock);
525 dev_pm_opp_put_opp_table(opp_table);
529 EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
531 static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
534 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
536 mutex_lock(&opp_table->lock);
538 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
539 if (temp_opp->available && temp_opp->rate >= *freq) {
543 /* Increment the reference count of OPP */
549 mutex_unlock(&opp_table->lock);
555 * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
556 * @dev: device for which we do this operation
557 * @freq: Start frequency
559 * Search for the matching ceil *available* OPP from a starting freq
562 * Return: matching *opp and refreshes *freq accordingly, else returns
563 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
565 * EINVAL: for bad pointer
566 * ERANGE: no match found for search
567 * ENODEV: if device not found in list of registered devices
569 * The callers are required to call dev_pm_opp_put() for the returned OPP after
572 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
575 struct opp_table *opp_table;
576 struct dev_pm_opp *opp;
579 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
580 return ERR_PTR(-EINVAL);
583 opp_table = _find_opp_table(dev);
584 if (IS_ERR(opp_table))
585 return ERR_CAST(opp_table);
587 opp = _find_freq_ceil(opp_table, freq);
589 dev_pm_opp_put_opp_table(opp_table);
593 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
596 * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
597 * @dev: device for which we do this operation
598 * @freq: Start frequency
600 * Search for the matching floor *available* OPP from a starting freq
603 * Return: matching *opp and refreshes *freq accordingly, else returns
604 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
606 * EINVAL: for bad pointer
607 * ERANGE: no match found for search
608 * ENODEV: if device not found in list of registered devices
610 * The callers are required to call dev_pm_opp_put() for the returned OPP after
613 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
616 struct opp_table *opp_table;
617 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
620 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
621 return ERR_PTR(-EINVAL);
624 opp_table = _find_opp_table(dev);
625 if (IS_ERR(opp_table))
626 return ERR_CAST(opp_table);
628 mutex_lock(&opp_table->lock);
630 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
631 if (temp_opp->available) {
632 /* go to the next node, before choosing prev */
633 if (temp_opp->rate > *freq)
640 /* Increment the reference count of OPP */
643 mutex_unlock(&opp_table->lock);
644 dev_pm_opp_put_opp_table(opp_table);
651 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
654 * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
656 * @dev: Device for which we do this operation.
657 * @u_volt: Target voltage.
659 * Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
661 * Return: matching *opp, else returns ERR_PTR in case of error which should be
662 * handled using IS_ERR.
664 * Error return values can be:
665 * EINVAL: bad parameters
667 * The callers are required to call dev_pm_opp_put() for the returned OPP after
670 struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
671 unsigned long u_volt)
673 struct opp_table *opp_table;
674 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
676 if (!dev || !u_volt) {
677 dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__,
679 return ERR_PTR(-EINVAL);
682 opp_table = _find_opp_table(dev);
683 if (IS_ERR(opp_table))
684 return ERR_CAST(opp_table);
686 mutex_lock(&opp_table->lock);
688 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
689 if (temp_opp->available) {
690 if (temp_opp->supplies[0].u_volt > u_volt)
696 /* Increment the reference count of OPP */
700 mutex_unlock(&opp_table->lock);
701 dev_pm_opp_put_opp_table(opp_table);
705 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);
707 static int _set_opp_voltage(struct device *dev, struct regulator *reg,
708 struct dev_pm_opp_supply *supply)
712 /* Regulator not available for device */
714 dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
719 dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
720 supply->u_volt_min, supply->u_volt, supply->u_volt_max);
722 ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
723 supply->u_volt, supply->u_volt_max);
725 dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
726 __func__, supply->u_volt_min, supply->u_volt,
727 supply->u_volt_max, ret);
732 static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
737 /* We may reach here for devices which don't change frequency */
741 ret = clk_set_rate(clk, freq);
743 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
750 static int _generic_set_opp_regulator(struct opp_table *opp_table,
752 struct dev_pm_opp *opp,
756 struct regulator *reg = opp_table->regulators[0];
757 struct dev_pm_opp *old_opp = opp_table->current_opp;
760 /* This function only supports single regulator per device */
761 if (WARN_ON(opp_table->regulator_count > 1)) {
762 dev_err(dev, "multiple regulators are not supported\n");
766 /* Scaling up? Scale voltage before frequency */
768 ret = _set_opp_voltage(dev, reg, opp->supplies);
770 goto restore_voltage;
773 /* Change frequency */
774 ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
776 goto restore_voltage;
778 /* Scaling down? Scale voltage after frequency */
780 ret = _set_opp_voltage(dev, reg, opp->supplies);
786 * Enable the regulator after setting its voltages, otherwise it breaks
787 * some boot-enabled regulators.
789 if (unlikely(!opp_table->enabled)) {
790 ret = regulator_enable(reg);
792 dev_warn(dev, "Failed to enable regulator: %d", ret);
798 if (_generic_set_opp_clk_only(dev, opp_table->clk, old_opp->rate))
799 dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
800 __func__, old_opp->rate);
802 /* This shouldn't harm even if the voltages weren't updated earlier */
803 _set_opp_voltage(dev, reg, old_opp->supplies);
808 static int _set_opp_bw(const struct opp_table *opp_table,
809 struct dev_pm_opp *opp, struct device *dev)
814 if (!opp_table->paths)
817 for (i = 0; i < opp_table->path_count; i++) {
822 avg = opp->bandwidth[i].avg;
823 peak = opp->bandwidth[i].peak;
825 ret = icc_set_bw(opp_table->paths[i], avg, peak);
827 dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
828 opp ? "set" : "remove", i, ret);
836 static int _set_opp_custom(const struct opp_table *opp_table,
837 struct device *dev, struct dev_pm_opp *opp,
840 struct dev_pm_set_opp_data *data = opp_table->set_opp_data;
841 struct dev_pm_opp *old_opp = opp_table->current_opp;
845 * We support this only if dev_pm_opp_set_regulators() was called
848 if (opp_table->sod_supplies) {
849 size = sizeof(*old_opp->supplies) * opp_table->regulator_count;
850 memcpy(data->old_opp.supplies, old_opp->supplies, size);
851 memcpy(data->new_opp.supplies, opp->supplies, size);
852 data->regulator_count = opp_table->regulator_count;
854 data->regulator_count = 0;
857 data->regulators = opp_table->regulators;
858 data->clk = opp_table->clk;
860 data->old_opp.rate = old_opp->rate;
861 data->new_opp.rate = freq;
863 return opp_table->set_opp(data);
866 static int _set_required_opp(struct device *dev, struct device *pd_dev,
867 struct dev_pm_opp *opp, int i)
869 unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
875 ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
877 dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
878 dev_name(pd_dev), pstate, ret);
884 /* This is only called for PM domain for now */
885 static int _set_required_opps(struct device *dev,
886 struct opp_table *opp_table,
887 struct dev_pm_opp *opp, bool up)
889 struct opp_table **required_opp_tables = opp_table->required_opp_tables;
890 struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
893 if (!required_opp_tables)
896 /* required-opps not fully initialized yet */
897 if (lazy_linking_pending(opp_table))
900 /* Single genpd case */
901 if (!genpd_virt_devs)
902 return _set_required_opp(dev, dev, opp, 0);
904 /* Multiple genpd case */
907 * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
908 * after it is freed from another thread.
910 mutex_lock(&opp_table->genpd_virt_dev_lock);
912 /* Scaling up? Set required OPPs in normal order, else reverse */
914 for (i = 0; i < opp_table->required_opp_count; i++) {
915 ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
920 for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
921 ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
927 mutex_unlock(&opp_table->genpd_virt_dev_lock);
932 static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
934 struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
937 if (!IS_ERR(opp_table->clk)) {
938 freq = clk_get_rate(opp_table->clk);
939 opp = _find_freq_ceil(opp_table, &freq);
943 * Unable to find the current OPP ? Pick the first from the list since
944 * it is in ascending order, otherwise rest of the code will need to
945 * make special checks to validate current_opp.
948 mutex_lock(&opp_table->lock);
949 opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node);
951 mutex_unlock(&opp_table->lock);
954 opp_table->current_opp = opp;
957 static int _disable_opp_table(struct device *dev, struct opp_table *opp_table)
961 if (!opp_table->enabled)
965 * Some drivers need to support cases where some platforms may
966 * have OPP table for the device, while others don't and
967 * opp_set_rate() just needs to behave like clk_set_rate().
969 if (!_get_opp_count(opp_table))
972 ret = _set_opp_bw(opp_table, NULL, dev);
976 if (opp_table->regulators)
977 regulator_disable(opp_table->regulators[0]);
979 ret = _set_required_opps(dev, opp_table, NULL, false);
981 opp_table->enabled = false;
985 static int _set_opp(struct device *dev, struct opp_table *opp_table,
986 struct dev_pm_opp *opp, unsigned long freq)
988 struct dev_pm_opp *old_opp;
989 int scaling_down, ret;
992 return _disable_opp_table(dev, opp_table);
994 /* Find the currently set OPP if we don't know already */
995 if (unlikely(!opp_table->current_opp))
996 _find_current_opp(dev, opp_table);
998 old_opp = opp_table->current_opp;
1000 /* Return early if nothing to do */
1001 if (opp_table->enabled && old_opp == opp) {
1002 dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__);
1006 dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n",
1007 __func__, old_opp->rate, freq, old_opp->level, opp->level,
1008 old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
1009 opp->bandwidth ? opp->bandwidth[0].peak : 0);
1011 scaling_down = _opp_compare_key(old_opp, opp);
1012 if (scaling_down == -1)
1015 /* Scaling up? Configure required OPPs before frequency */
1016 if (!scaling_down) {
1017 ret = _set_required_opps(dev, opp_table, opp, true);
1019 dev_err(dev, "Failed to set required opps: %d\n", ret);
1023 ret = _set_opp_bw(opp_table, opp, dev);
1025 dev_err(dev, "Failed to set bw: %d\n", ret);
1030 if (opp_table->set_opp) {
1031 ret = _set_opp_custom(opp_table, dev, opp, freq);
1032 } else if (opp_table->regulators) {
1033 ret = _generic_set_opp_regulator(opp_table, dev, opp, freq,
1036 /* Only frequency scaling */
1037 ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
1043 /* Scaling down? Configure required OPPs after frequency */
1045 ret = _set_opp_bw(opp_table, opp, dev);
1047 dev_err(dev, "Failed to set bw: %d\n", ret);
1051 ret = _set_required_opps(dev, opp_table, opp, false);
1053 dev_err(dev, "Failed to set required opps: %d\n", ret);
1058 opp_table->enabled = true;
1059 dev_pm_opp_put(old_opp);
1061 /* Make sure current_opp doesn't get freed */
1062 dev_pm_opp_get(opp);
1063 opp_table->current_opp = opp;
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
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
1079 int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
1081 struct opp_table *opp_table;
1082 unsigned long freq = 0, temp_freq;
1083 struct dev_pm_opp *opp = NULL;
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);
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()
1100 if (!_get_opp_count(opp_table)) {
1101 ret = _generic_set_opp_clk_only(dev, opp_table->clk, target_freq);
1105 freq = clk_round_rate(opp_table->clk, target_freq);
1106 if ((long)freq <= 0)
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.
1115 opp = _find_freq_ceil(opp_table, &temp_freq);
1118 dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
1119 __func__, freq, ret);
1124 ret = _set_opp(dev, opp_table, opp, freq);
1127 dev_pm_opp_put(opp);
1129 dev_pm_opp_put_opp_table(opp_table);
1132 EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
1135 * dev_pm_opp_set_opp() - Configure device for OPP
1136 * @dev: device for which we do this operation
1137 * @opp: OPP to set to
1139 * This configures the device based on the properties of the OPP passed to this
1142 * Return: 0 on success, a negative error number otherwise.
1144 int dev_pm_opp_set_opp(struct device *dev, struct dev_pm_opp *opp)
1146 struct opp_table *opp_table;
1149 opp_table = _find_opp_table(dev);
1150 if (IS_ERR(opp_table)) {
1151 dev_err(dev, "%s: device opp doesn't exist\n", __func__);
1152 return PTR_ERR(opp_table);
1155 ret = _set_opp(dev, opp_table, opp, opp ? opp->rate : 0);
1156 dev_pm_opp_put_opp_table(opp_table);
1160 EXPORT_SYMBOL_GPL(dev_pm_opp_set_opp);
1162 /* OPP-dev Helpers */
1163 static void _remove_opp_dev(struct opp_device *opp_dev,
1164 struct opp_table *opp_table)
1166 opp_debug_unregister(opp_dev, opp_table);
1167 list_del(&opp_dev->node);
1171 struct opp_device *_add_opp_dev(const struct device *dev,
1172 struct opp_table *opp_table)
1174 struct opp_device *opp_dev;
1176 opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
1180 /* Initialize opp-dev */
1183 mutex_lock(&opp_table->lock);
1184 list_add(&opp_dev->node, &opp_table->dev_list);
1185 mutex_unlock(&opp_table->lock);
1187 /* Create debugfs entries for the opp_table */
1188 opp_debug_register(opp_dev, opp_table);
1193 static struct opp_table *_allocate_opp_table(struct device *dev, int index)
1195 struct opp_table *opp_table;
1196 struct opp_device *opp_dev;
1200 * Allocate a new OPP table. In the infrequent case where a new
1201 * device is needed to be added, we pay this penalty.
1203 opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
1205 return ERR_PTR(-ENOMEM);
1207 mutex_init(&opp_table->lock);
1208 mutex_init(&opp_table->genpd_virt_dev_lock);
1209 INIT_LIST_HEAD(&opp_table->dev_list);
1210 INIT_LIST_HEAD(&opp_table->lazy);
1212 /* Mark regulator count uninitialized */
1213 opp_table->regulator_count = -1;
1215 opp_dev = _add_opp_dev(dev, opp_table);
1221 _of_init_opp_table(opp_table, dev, index);
1223 /* Find interconnect path(s) for the device */
1224 ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
1226 if (ret == -EPROBE_DEFER)
1227 goto remove_opp_dev;
1229 dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
1233 BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
1234 INIT_LIST_HEAD(&opp_table->opp_list);
1235 kref_init(&opp_table->kref);
1240 _remove_opp_dev(opp_dev, opp_table);
1243 return ERR_PTR(ret);
1246 void _get_opp_table_kref(struct opp_table *opp_table)
1248 kref_get(&opp_table->kref);
1251 static struct opp_table *_update_opp_table_clk(struct device *dev,
1252 struct opp_table *opp_table,
1258 * Return early if we don't need to get clk or we have already tried it
1261 if (!getclk || IS_ERR(opp_table) || opp_table->clk)
1264 /* Find clk for the device */
1265 opp_table->clk = clk_get(dev, NULL);
1267 ret = PTR_ERR_OR_ZERO(opp_table->clk);
1271 if (ret == -ENOENT) {
1272 dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
1276 dev_pm_opp_put_opp_table(opp_table);
1277 dev_err_probe(dev, ret, "Couldn't find clock\n");
1279 return ERR_PTR(ret);
1283 * We need to make sure that the OPP table for a device doesn't get added twice,
1284 * if this routine gets called in parallel with the same device pointer.
1286 * The simplest way to enforce that is to perform everything (find existing
1287 * table and if not found, create a new one) under the opp_table_lock, so only
1288 * one creator gets access to the same. But that expands the critical section
1289 * under the lock and may end up causing circular dependencies with frameworks
1290 * like debugfs, interconnect or clock framework as they may be direct or
1291 * indirect users of OPP core.
1293 * And for that reason we have to go for a bit tricky implementation here, which
1294 * uses the opp_tables_busy flag to indicate if another creator is in the middle
1295 * of adding an OPP table and others should wait for it to finish.
1297 struct opp_table *_add_opp_table_indexed(struct device *dev, int index,
1300 struct opp_table *opp_table;
1303 mutex_lock(&opp_table_lock);
1305 opp_table = _find_opp_table_unlocked(dev);
1306 if (!IS_ERR(opp_table))
1310 * The opp_tables list or an OPP table's dev_list is getting updated by
1311 * another user, wait for it to finish.
1313 if (unlikely(opp_tables_busy)) {
1314 mutex_unlock(&opp_table_lock);
1319 opp_tables_busy = true;
1320 opp_table = _managed_opp(dev, index);
1322 /* Drop the lock to reduce the size of critical section */
1323 mutex_unlock(&opp_table_lock);
1326 if (!_add_opp_dev(dev, opp_table)) {
1327 dev_pm_opp_put_opp_table(opp_table);
1328 opp_table = ERR_PTR(-ENOMEM);
1331 mutex_lock(&opp_table_lock);
1333 opp_table = _allocate_opp_table(dev, index);
1335 mutex_lock(&opp_table_lock);
1336 if (!IS_ERR(opp_table))
1337 list_add(&opp_table->node, &opp_tables);
1340 opp_tables_busy = false;
1343 mutex_unlock(&opp_table_lock);
1345 return _update_opp_table_clk(dev, opp_table, getclk);
1348 static struct opp_table *_add_opp_table(struct device *dev, bool getclk)
1350 return _add_opp_table_indexed(dev, 0, getclk);
1353 struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
1355 return _find_opp_table(dev);
1357 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
1359 static void _opp_table_kref_release(struct kref *kref)
1361 struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
1362 struct opp_device *opp_dev, *temp;
1365 /* Drop the lock as soon as we can */
1366 list_del(&opp_table->node);
1367 mutex_unlock(&opp_table_lock);
1369 if (opp_table->current_opp)
1370 dev_pm_opp_put(opp_table->current_opp);
1372 _of_clear_opp_table(opp_table);
1375 if (!IS_ERR(opp_table->clk))
1376 clk_put(opp_table->clk);
1378 if (opp_table->paths) {
1379 for (i = 0; i < opp_table->path_count; i++)
1380 icc_put(opp_table->paths[i]);
1381 kfree(opp_table->paths);
1384 WARN_ON(!list_empty(&opp_table->opp_list));
1386 list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
1388 * The OPP table is getting removed, drop the performance state
1391 if (opp_table->genpd_performance_state)
1392 dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);
1394 _remove_opp_dev(opp_dev, opp_table);
1397 mutex_destroy(&opp_table->genpd_virt_dev_lock);
1398 mutex_destroy(&opp_table->lock);
1402 void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
1404 kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
1407 EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
1409 void _opp_free(struct dev_pm_opp *opp)
1414 static void _opp_kref_release(struct kref *kref)
1416 struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
1417 struct opp_table *opp_table = opp->opp_table;
1419 list_del(&opp->node);
1420 mutex_unlock(&opp_table->lock);
1423 * Notify the changes in the availability of the operable
1424 * frequency/voltage list.
1426 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
1427 _of_opp_free_required_opps(opp_table, opp);
1428 opp_debug_remove_one(opp);
1432 void dev_pm_opp_get(struct dev_pm_opp *opp)
1434 kref_get(&opp->kref);
1437 void dev_pm_opp_put(struct dev_pm_opp *opp)
1439 kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock);
1441 EXPORT_SYMBOL_GPL(dev_pm_opp_put);
1444 * dev_pm_opp_remove() - Remove an OPP from OPP table
1445 * @dev: device for which we do this operation
1446 * @freq: OPP to remove with matching 'freq'
1448 * This function removes an opp from the opp table.
1450 void dev_pm_opp_remove(struct device *dev, unsigned long freq)
1452 struct dev_pm_opp *opp;
1453 struct opp_table *opp_table;
1456 opp_table = _find_opp_table(dev);
1457 if (IS_ERR(opp_table))
1460 mutex_lock(&opp_table->lock);
1462 list_for_each_entry(opp, &opp_table->opp_list, node) {
1463 if (opp->rate == freq) {
1469 mutex_unlock(&opp_table->lock);
1472 dev_pm_opp_put(opp);
1474 /* Drop the reference taken by dev_pm_opp_add() */
1475 dev_pm_opp_put_opp_table(opp_table);
1477 dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
1481 /* Drop the reference taken by _find_opp_table() */
1482 dev_pm_opp_put_opp_table(opp_table);
1484 EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
1486 static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
1489 struct dev_pm_opp *opp = NULL, *temp;
1491 mutex_lock(&opp_table->lock);
1492 list_for_each_entry(temp, &opp_table->opp_list, node) {
1493 if (dynamic == temp->dynamic) {
1499 mutex_unlock(&opp_table->lock);
1503 bool _opp_remove_all_static(struct opp_table *opp_table)
1505 struct dev_pm_opp *opp;
1507 mutex_lock(&opp_table->lock);
1509 if (!opp_table->parsed_static_opps) {
1510 mutex_unlock(&opp_table->lock);
1514 if (--opp_table->parsed_static_opps) {
1515 mutex_unlock(&opp_table->lock);
1519 mutex_unlock(&opp_table->lock);
1522 * Can't remove the OPP from under the lock, debugfs removal needs to
1523 * happen lock less to avoid circular dependency issues.
1525 while ((opp = _opp_get_next(opp_table, false)))
1526 dev_pm_opp_put(opp);
1532 * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
1533 * @dev: device for which we do this operation
1535 * This function removes all dynamically created OPPs from the opp table.
1537 void dev_pm_opp_remove_all_dynamic(struct device *dev)
1539 struct opp_table *opp_table;
1540 struct dev_pm_opp *opp;
1543 opp_table = _find_opp_table(dev);
1544 if (IS_ERR(opp_table))
1548 * Can't remove the OPP from under the lock, debugfs removal needs to
1549 * happen lock less to avoid circular dependency issues.
1551 while ((opp = _opp_get_next(opp_table, true))) {
1552 dev_pm_opp_put(opp);
1556 /* Drop the references taken by dev_pm_opp_add() */
1558 dev_pm_opp_put_opp_table(opp_table);
1560 /* Drop the reference taken by _find_opp_table() */
1561 dev_pm_opp_put_opp_table(opp_table);
1563 EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
1565 struct dev_pm_opp *_opp_allocate(struct opp_table *table)
1567 struct dev_pm_opp *opp;
1568 int supply_count, supply_size, icc_size;
1570 /* Allocate space for at least one supply */
1571 supply_count = table->regulator_count > 0 ? table->regulator_count : 1;
1572 supply_size = sizeof(*opp->supplies) * supply_count;
1573 icc_size = sizeof(*opp->bandwidth) * table->path_count;
1575 /* allocate new OPP node and supplies structures */
1576 opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL);
1581 /* Put the supplies at the end of the OPP structure as an empty array */
1582 opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
1584 opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count);
1585 INIT_LIST_HEAD(&opp->node);
1590 static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
1591 struct opp_table *opp_table)
1593 struct regulator *reg;
1596 if (!opp_table->regulators)
1599 for (i = 0; i < opp_table->regulator_count; i++) {
1600 reg = opp_table->regulators[i];
1602 if (!regulator_is_supported_voltage(reg,
1603 opp->supplies[i].u_volt_min,
1604 opp->supplies[i].u_volt_max)) {
1605 pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
1606 __func__, opp->supplies[i].u_volt_min,
1607 opp->supplies[i].u_volt_max);
1615 int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
1617 if (opp1->rate != opp2->rate)
1618 return opp1->rate < opp2->rate ? -1 : 1;
1619 if (opp1->bandwidth && opp2->bandwidth &&
1620 opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
1621 return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;
1622 if (opp1->level != opp2->level)
1623 return opp1->level < opp2->level ? -1 : 1;
1627 static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
1628 struct opp_table *opp_table,
1629 struct list_head **head)
1631 struct dev_pm_opp *opp;
1635 * Insert new OPP in order of increasing frequency and discard if
1638 * Need to use &opp_table->opp_list in the condition part of the 'for'
1639 * loop, don't replace it with head otherwise it will become an infinite
1642 list_for_each_entry(opp, &opp_table->opp_list, node) {
1643 opp_cmp = _opp_compare_key(new_opp, opp);
1652 /* Duplicate OPPs */
1653 dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
1654 __func__, opp->rate, opp->supplies[0].u_volt,
1655 opp->available, new_opp->rate,
1656 new_opp->supplies[0].u_volt, new_opp->available);
1658 /* Should we compare voltages for all regulators here ? */
1659 return opp->available &&
1660 new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
1666 void _required_opps_available(struct dev_pm_opp *opp, int count)
1670 for (i = 0; i < count; i++) {
1671 if (opp->required_opps[i]->available)
1674 opp->available = false;
1675 pr_warn("%s: OPP not supported by required OPP %pOF (%lu)\n",
1676 __func__, opp->required_opps[i]->np, opp->rate);
1683 * 0: On success. And appropriate error message for duplicate OPPs.
1684 * -EBUSY: For OPP with same freq/volt and is available. The callers of
1685 * _opp_add() must return 0 if they receive -EBUSY from it. This is to make
1686 * sure we don't print error messages unnecessarily if different parts of
1687 * kernel try to initialize the OPP table.
1688 * -EEXIST: For OPP with same freq but different volt or is unavailable. This
1689 * should be considered an error by the callers of _opp_add().
1691 int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
1692 struct opp_table *opp_table, bool rate_not_available)
1694 struct list_head *head;
1697 mutex_lock(&opp_table->lock);
1698 head = &opp_table->opp_list;
1700 ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
1702 mutex_unlock(&opp_table->lock);
1706 list_add(&new_opp->node, head);
1707 mutex_unlock(&opp_table->lock);
1709 new_opp->opp_table = opp_table;
1710 kref_init(&new_opp->kref);
1712 opp_debug_create_one(new_opp, opp_table);
1714 if (!_opp_supported_by_regulators(new_opp, opp_table)) {
1715 new_opp->available = false;
1716 dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
1717 __func__, new_opp->rate);
1720 /* required-opps not fully initialized yet */
1721 if (lazy_linking_pending(opp_table))
1724 _required_opps_available(new_opp, opp_table->required_opp_count);
1730 * _opp_add_v1() - Allocate a OPP based on v1 bindings.
1731 * @opp_table: OPP table
1732 * @dev: device for which we do this operation
1733 * @freq: Frequency in Hz for this OPP
1734 * @u_volt: Voltage in uVolts for this OPP
1735 * @dynamic: Dynamically added OPPs.
1737 * This function adds an opp definition to the opp table and returns status.
1738 * The opp is made available by default and it can be controlled using
1739 * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
1741 * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
1742 * and freed by dev_pm_opp_of_remove_table.
1746 * Duplicate OPPs (both freq and volt are same) and opp->available
1747 * -EEXIST Freq are same and volt are different OR
1748 * Duplicate OPPs (both freq and volt are same) and !opp->available
1749 * -ENOMEM Memory allocation failure
1751 int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
1752 unsigned long freq, long u_volt, bool dynamic)
1754 struct dev_pm_opp *new_opp;
1758 new_opp = _opp_allocate(opp_table);
1762 /* populate the opp table */
1763 new_opp->rate = freq;
1764 tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
1765 new_opp->supplies[0].u_volt = u_volt;
1766 new_opp->supplies[0].u_volt_min = u_volt - tol;
1767 new_opp->supplies[0].u_volt_max = u_volt + tol;
1768 new_opp->available = true;
1769 new_opp->dynamic = dynamic;
1771 ret = _opp_add(dev, new_opp, opp_table, false);
1773 /* Don't return error for duplicate OPPs */
1780 * Notify the changes in the availability of the operable
1781 * frequency/voltage list.
1783 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
1793 * dev_pm_opp_set_supported_hw() - Set supported platforms
1794 * @dev: Device for which supported-hw has to be set.
1795 * @versions: Array of hierarchy of versions to match.
1796 * @count: Number of elements in the array.
1798 * This is required only for the V2 bindings, and it enables a platform to
1799 * specify the hierarchy of versions it supports. OPP layer will then enable
1800 * OPPs, which are available for those versions, based on its 'opp-supported-hw'
1803 struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
1804 const u32 *versions, unsigned int count)
1806 struct opp_table *opp_table;
1808 opp_table = _add_opp_table(dev, false);
1809 if (IS_ERR(opp_table))
1812 /* Make sure there are no concurrent readers while updating opp_table */
1813 WARN_ON(!list_empty(&opp_table->opp_list));
1815 /* Another CPU that shares the OPP table has set the property ? */
1816 if (opp_table->supported_hw)
1819 opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
1821 if (!opp_table->supported_hw) {
1822 dev_pm_opp_put_opp_table(opp_table);
1823 return ERR_PTR(-ENOMEM);
1826 opp_table->supported_hw_count = count;
1830 EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
1833 * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw
1834 * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().
1836 * This is required only for the V2 bindings, and is called for a matching
1837 * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
1838 * will not be freed.
1840 void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
1842 if (unlikely(!opp_table))
1845 /* Make sure there are no concurrent readers while updating opp_table */
1846 WARN_ON(!list_empty(&opp_table->opp_list));
1848 kfree(opp_table->supported_hw);
1849 opp_table->supported_hw = NULL;
1850 opp_table->supported_hw_count = 0;
1852 dev_pm_opp_put_opp_table(opp_table);
1854 EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
1857 * dev_pm_opp_set_prop_name() - Set prop-extn name
1858 * @dev: Device for which the prop-name has to be set.
1859 * @name: name to postfix to properties.
1861 * This is required only for the V2 bindings, and it enables a platform to
1862 * specify the extn to be used for certain property names. The properties to
1863 * which the extension will apply are opp-microvolt and opp-microamp. OPP core
1864 * should postfix the property name with -<name> while looking for them.
1866 struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
1868 struct opp_table *opp_table;
1870 opp_table = _add_opp_table(dev, false);
1871 if (IS_ERR(opp_table))
1874 /* Make sure there are no concurrent readers while updating opp_table */
1875 WARN_ON(!list_empty(&opp_table->opp_list));
1877 /* Another CPU that shares the OPP table has set the property ? */
1878 if (opp_table->prop_name)
1881 opp_table->prop_name = kstrdup(name, GFP_KERNEL);
1882 if (!opp_table->prop_name) {
1883 dev_pm_opp_put_opp_table(opp_table);
1884 return ERR_PTR(-ENOMEM);
1889 EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
1892 * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name
1893 * @opp_table: OPP table returned by dev_pm_opp_set_prop_name().
1895 * This is required only for the V2 bindings, and is called for a matching
1896 * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
1897 * will not be freed.
1899 void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
1901 if (unlikely(!opp_table))
1904 /* Make sure there are no concurrent readers while updating opp_table */
1905 WARN_ON(!list_empty(&opp_table->opp_list));
1907 kfree(opp_table->prop_name);
1908 opp_table->prop_name = NULL;
1910 dev_pm_opp_put_opp_table(opp_table);
1912 EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
1915 * dev_pm_opp_set_regulators() - Set regulator names for the device
1916 * @dev: Device for which regulator name is being set.
1917 * @names: Array of pointers to the names of the regulator.
1918 * @count: Number of regulators.
1920 * In order to support OPP switching, OPP layer needs to know the name of the
1921 * device's regulators, as the core would be required to switch voltages as
1924 * This must be called before any OPPs are initialized for the device.
1926 struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
1927 const char * const names[],
1930 struct dev_pm_opp_supply *supplies;
1931 struct opp_table *opp_table;
1932 struct regulator *reg;
1935 opp_table = _add_opp_table(dev, false);
1936 if (IS_ERR(opp_table))
1939 /* This should be called before OPPs are initialized */
1940 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1945 /* Another CPU that shares the OPP table has set the regulators ? */
1946 if (opp_table->regulators)
1949 opp_table->regulators = kmalloc_array(count,
1950 sizeof(*opp_table->regulators),
1952 if (!opp_table->regulators) {
1957 for (i = 0; i < count; i++) {
1958 reg = regulator_get_optional(dev, names[i]);
1961 if (ret != -EPROBE_DEFER)
1962 dev_err(dev, "%s: no regulator (%s) found: %d\n",
1963 __func__, names[i], ret);
1964 goto free_regulators;
1967 opp_table->regulators[i] = reg;
1970 opp_table->regulator_count = count;
1972 supplies = kmalloc_array(count * 2, sizeof(*supplies), GFP_KERNEL);
1975 goto free_regulators;
1978 mutex_lock(&opp_table->lock);
1979 opp_table->sod_supplies = supplies;
1980 if (opp_table->set_opp_data) {
1981 opp_table->set_opp_data->old_opp.supplies = supplies;
1982 opp_table->set_opp_data->new_opp.supplies = supplies + count;
1984 mutex_unlock(&opp_table->lock);
1990 regulator_put(opp_table->regulators[--i]);
1992 kfree(opp_table->regulators);
1993 opp_table->regulators = NULL;
1994 opp_table->regulator_count = -1;
1996 dev_pm_opp_put_opp_table(opp_table);
1998 return ERR_PTR(ret);
2000 EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
2003 * dev_pm_opp_put_regulators() - Releases resources blocked for regulator
2004 * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
2006 void dev_pm_opp_put_regulators(struct opp_table *opp_table)
2010 if (unlikely(!opp_table))
2013 if (!opp_table->regulators)
2016 /* Make sure there are no concurrent readers while updating opp_table */
2017 WARN_ON(!list_empty(&opp_table->opp_list));
2019 if (opp_table->enabled) {
2020 for (i = opp_table->regulator_count - 1; i >= 0; i--)
2021 regulator_disable(opp_table->regulators[i]);
2024 for (i = opp_table->regulator_count - 1; i >= 0; i--)
2025 regulator_put(opp_table->regulators[i]);
2027 mutex_lock(&opp_table->lock);
2028 if (opp_table->set_opp_data) {
2029 opp_table->set_opp_data->old_opp.supplies = NULL;
2030 opp_table->set_opp_data->new_opp.supplies = NULL;
2033 kfree(opp_table->sod_supplies);
2034 opp_table->sod_supplies = NULL;
2035 mutex_unlock(&opp_table->lock);
2037 kfree(opp_table->regulators);
2038 opp_table->regulators = NULL;
2039 opp_table->regulator_count = -1;
2042 dev_pm_opp_put_opp_table(opp_table);
2044 EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
2047 * dev_pm_opp_set_clkname() - Set clk name for the device
2048 * @dev: Device for which clk name is being set.
2051 * In order to support OPP switching, OPP layer needs to get pointer to the
2052 * clock for the device. Simple cases work fine without using this routine (i.e.
2053 * by passing connection-id as NULL), but for a device with multiple clocks
2054 * available, the OPP core needs to know the exact name of the clk to use.
2056 * This must be called before any OPPs are initialized for the device.
2058 struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
2060 struct opp_table *opp_table;
2063 opp_table = _add_opp_table(dev, false);
2064 if (IS_ERR(opp_table))
2067 /* This should be called before OPPs are initialized */
2068 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
2073 /* clk shouldn't be initialized at this point */
2074 if (WARN_ON(opp_table->clk)) {
2079 /* Find clk for the device */
2080 opp_table->clk = clk_get(dev, name);
2081 if (IS_ERR(opp_table->clk)) {
2082 ret = PTR_ERR(opp_table->clk);
2083 if (ret != -EPROBE_DEFER) {
2084 dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
2093 dev_pm_opp_put_opp_table(opp_table);
2095 return ERR_PTR(ret);
2097 EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
2100 * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
2101 * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
2103 void dev_pm_opp_put_clkname(struct opp_table *opp_table)
2105 if (unlikely(!opp_table))
2108 /* Make sure there are no concurrent readers while updating opp_table */
2109 WARN_ON(!list_empty(&opp_table->opp_list));
2111 clk_put(opp_table->clk);
2112 opp_table->clk = ERR_PTR(-EINVAL);
2114 dev_pm_opp_put_opp_table(opp_table);
2116 EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
2119 * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
2120 * @dev: Device for which the helper is getting registered.
2121 * @set_opp: Custom set OPP helper.
2123 * This is useful to support complex platforms (like platforms with multiple
2124 * regulators per device), instead of the generic OPP set rate helper.
2126 * This must be called before any OPPs are initialized for the device.
2128 struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
2129 int (*set_opp)(struct dev_pm_set_opp_data *data))
2131 struct dev_pm_set_opp_data *data;
2132 struct opp_table *opp_table;
2135 return ERR_PTR(-EINVAL);
2137 opp_table = _add_opp_table(dev, false);
2138 if (IS_ERR(opp_table))
2141 /* This should be called before OPPs are initialized */
2142 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
2143 dev_pm_opp_put_opp_table(opp_table);
2144 return ERR_PTR(-EBUSY);
2147 /* Another CPU that shares the OPP table has set the helper ? */
2148 if (opp_table->set_opp)
2151 data = kzalloc(sizeof(*data), GFP_KERNEL);
2153 return ERR_PTR(-ENOMEM);
2155 mutex_lock(&opp_table->lock);
2156 opp_table->set_opp_data = data;
2157 if (opp_table->sod_supplies) {
2158 data->old_opp.supplies = opp_table->sod_supplies;
2159 data->new_opp.supplies = opp_table->sod_supplies +
2160 opp_table->regulator_count;
2162 mutex_unlock(&opp_table->lock);
2164 opp_table->set_opp = set_opp;
2168 EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
2171 * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for
2173 * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
2175 * Release resources blocked for platform specific set_opp helper.
2177 void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
2179 if (unlikely(!opp_table))
2182 /* Make sure there are no concurrent readers while updating opp_table */
2183 WARN_ON(!list_empty(&opp_table->opp_list));
2185 opp_table->set_opp = NULL;
2187 mutex_lock(&opp_table->lock);
2188 kfree(opp_table->set_opp_data);
2189 opp_table->set_opp_data = NULL;
2190 mutex_unlock(&opp_table->lock);
2192 dev_pm_opp_put_opp_table(opp_table);
2194 EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
2196 static void devm_pm_opp_unregister_set_opp_helper(void *data)
2198 dev_pm_opp_unregister_set_opp_helper(data);
2202 * devm_pm_opp_register_set_opp_helper() - Register custom set OPP helper
2203 * @dev: Device for which the helper is getting registered.
2204 * @set_opp: Custom set OPP helper.
2206 * This is a resource-managed version of dev_pm_opp_register_set_opp_helper().
2208 * Return: pointer to 'struct opp_table' on success and errorno otherwise.
2211 devm_pm_opp_register_set_opp_helper(struct device *dev,
2212 int (*set_opp)(struct dev_pm_set_opp_data *data))
2214 struct opp_table *opp_table;
2217 opp_table = dev_pm_opp_register_set_opp_helper(dev, set_opp);
2218 if (IS_ERR(opp_table))
2221 err = devm_add_action_or_reset(dev, devm_pm_opp_unregister_set_opp_helper,
2224 return ERR_PTR(err);
2228 EXPORT_SYMBOL_GPL(devm_pm_opp_register_set_opp_helper);
2230 static void _opp_detach_genpd(struct opp_table *opp_table)
2234 if (!opp_table->genpd_virt_devs)
2237 for (index = 0; index < opp_table->required_opp_count; index++) {
2238 if (!opp_table->genpd_virt_devs[index])
2241 dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
2242 opp_table->genpd_virt_devs[index] = NULL;
2245 kfree(opp_table->genpd_virt_devs);
2246 opp_table->genpd_virt_devs = NULL;
2250 * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
2251 * @dev: Consumer device for which the genpd is getting attached.
2252 * @names: Null terminated array of pointers containing names of genpd to attach.
2253 * @virt_devs: Pointer to return the array of virtual devices.
2255 * Multiple generic power domains for a device are supported with the help of
2256 * virtual genpd devices, which are created for each consumer device - genpd
2257 * pair. These are the device structures which are attached to the power domain
2258 * and are required by the OPP core to set the performance state of the genpd.
2259 * The same API also works for the case where single genpd is available and so
2260 * we don't need to support that separately.
2262 * This helper will normally be called by the consumer driver of the device
2263 * "dev", as only that has details of the genpd names.
2265 * This helper needs to be called once with a list of all genpd to attach.
2266 * Otherwise the original device structure will be used instead by the OPP core.
2268 * The order of entries in the names array must match the order in which
2269 * "required-opps" are added in DT.
2271 struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
2272 const char **names, struct device ***virt_devs)
2274 struct opp_table *opp_table;
2275 struct device *virt_dev;
2276 int index = 0, ret = -EINVAL;
2277 const char **name = names;
2279 opp_table = _add_opp_table(dev, false);
2280 if (IS_ERR(opp_table))
2283 if (opp_table->genpd_virt_devs)
2287 * If the genpd's OPP table isn't already initialized, parsing of the
2288 * required-opps fail for dev. We should retry this after genpd's OPP
2291 if (!opp_table->required_opp_count) {
2292 ret = -EPROBE_DEFER;
2296 mutex_lock(&opp_table->genpd_virt_dev_lock);
2298 opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
2299 sizeof(*opp_table->genpd_virt_devs),
2301 if (!opp_table->genpd_virt_devs)
2305 if (index >= opp_table->required_opp_count) {
2306 dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
2307 *name, opp_table->required_opp_count, index);
2311 virt_dev = dev_pm_domain_attach_by_name(dev, *name);
2312 if (IS_ERR(virt_dev)) {
2313 ret = PTR_ERR(virt_dev);
2314 dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
2318 opp_table->genpd_virt_devs[index] = virt_dev;
2324 *virt_devs = opp_table->genpd_virt_devs;
2325 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2330 _opp_detach_genpd(opp_table);
2332 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2335 dev_pm_opp_put_opp_table(opp_table);
2337 return ERR_PTR(ret);
2339 EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd);
2342 * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device.
2343 * @opp_table: OPP table returned by dev_pm_opp_attach_genpd().
2345 * This detaches the genpd(s), resets the virtual device pointers, and puts the
2348 void dev_pm_opp_detach_genpd(struct opp_table *opp_table)
2350 if (unlikely(!opp_table))
2354 * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
2357 mutex_lock(&opp_table->genpd_virt_dev_lock);
2358 _opp_detach_genpd(opp_table);
2359 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2361 dev_pm_opp_put_opp_table(opp_table);
2363 EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd);
2365 static void devm_pm_opp_detach_genpd(void *data)
2367 dev_pm_opp_detach_genpd(data);
2371 * devm_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual
2373 * @dev: Consumer device for which the genpd is getting attached.
2374 * @names: Null terminated array of pointers containing names of genpd to attach.
2375 * @virt_devs: Pointer to return the array of virtual devices.
2377 * This is a resource-managed version of dev_pm_opp_attach_genpd().
2379 * Return: pointer to 'struct opp_table' on success and errorno otherwise.
2382 devm_pm_opp_attach_genpd(struct device *dev, const char **names,
2383 struct device ***virt_devs)
2385 struct opp_table *opp_table;
2388 opp_table = dev_pm_opp_attach_genpd(dev, names, virt_devs);
2389 if (IS_ERR(opp_table))
2392 err = devm_add_action_or_reset(dev, devm_pm_opp_detach_genpd,
2395 return ERR_PTR(err);
2399 EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd);
2402 * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
2403 * @src_table: OPP table which has dst_table as one of its required OPP table.
2404 * @dst_table: Required OPP table of the src_table.
2405 * @pstate: Current performance state of the src_table.
2407 * This Returns pstate of the OPP (present in @dst_table) pointed out by the
2408 * "required-opps" property of the OPP (present in @src_table) which has
2409 * performance state set to @pstate.
2411 * Return: Zero or positive performance state on success, otherwise negative
2414 int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
2415 struct opp_table *dst_table,
2416 unsigned int pstate)
2418 struct dev_pm_opp *opp;
2419 int dest_pstate = -EINVAL;
2423 * Normally the src_table will have the "required_opps" property set to
2424 * point to one of the OPPs in the dst_table, but in some cases the
2425 * genpd and its master have one to one mapping of performance states
2426 * and so none of them have the "required-opps" property set. Return the
2427 * pstate of the src_table as it is in such cases.
2429 if (!src_table || !src_table->required_opp_count)
2432 /* required-opps not fully initialized yet */
2433 if (lazy_linking_pending(src_table))
2436 for (i = 0; i < src_table->required_opp_count; i++) {
2437 if (src_table->required_opp_tables[i]->np == dst_table->np)
2441 if (unlikely(i == src_table->required_opp_count)) {
2442 pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
2443 __func__, src_table, dst_table);
2447 mutex_lock(&src_table->lock);
2449 list_for_each_entry(opp, &src_table->opp_list, node) {
2450 if (opp->pstate == pstate) {
2451 dest_pstate = opp->required_opps[i]->pstate;
2456 pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
2460 mutex_unlock(&src_table->lock);
2466 * dev_pm_opp_add() - Add an OPP table from a table definitions
2467 * @dev: device for which we do this operation
2468 * @freq: Frequency in Hz for this OPP
2469 * @u_volt: Voltage in uVolts for this OPP
2471 * This function adds an opp definition to the opp table and returns status.
2472 * The opp is made available by default and it can be controlled using
2473 * dev_pm_opp_enable/disable functions.
2477 * Duplicate OPPs (both freq and volt are same) and opp->available
2478 * -EEXIST Freq are same and volt are different OR
2479 * Duplicate OPPs (both freq and volt are same) and !opp->available
2480 * -ENOMEM Memory allocation failure
2482 int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
2484 struct opp_table *opp_table;
2487 opp_table = _add_opp_table(dev, true);
2488 if (IS_ERR(opp_table))
2489 return PTR_ERR(opp_table);
2491 /* Fix regulator count for dynamic OPPs */
2492 opp_table->regulator_count = 1;
2494 ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
2496 dev_pm_opp_put_opp_table(opp_table);
2500 EXPORT_SYMBOL_GPL(dev_pm_opp_add);
2503 * _opp_set_availability() - helper to set the availability of an opp
2504 * @dev: device for which we do this operation
2505 * @freq: OPP frequency to modify availability
2506 * @availability_req: availability status requested for this opp
2508 * Set the availability of an OPP, opp_{enable,disable} share a common logic
2509 * which is isolated here.
2511 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2512 * copy operation, returns 0 if no modification was done OR modification was
2515 static int _opp_set_availability(struct device *dev, unsigned long freq,
2516 bool availability_req)
2518 struct opp_table *opp_table;
2519 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
2522 /* Find the opp_table */
2523 opp_table = _find_opp_table(dev);
2524 if (IS_ERR(opp_table)) {
2525 r = PTR_ERR(opp_table);
2526 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
2530 mutex_lock(&opp_table->lock);
2532 /* Do we have the frequency? */
2533 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
2534 if (tmp_opp->rate == freq) {
2545 /* Is update really needed? */
2546 if (opp->available == availability_req)
2549 opp->available = availability_req;
2551 dev_pm_opp_get(opp);
2552 mutex_unlock(&opp_table->lock);
2554 /* Notify the change of the OPP availability */
2555 if (availability_req)
2556 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
2559 blocking_notifier_call_chain(&opp_table->head,
2560 OPP_EVENT_DISABLE, opp);
2562 dev_pm_opp_put(opp);
2566 mutex_unlock(&opp_table->lock);
2568 dev_pm_opp_put_opp_table(opp_table);
2573 * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP
2574 * @dev: device for which we do this operation
2575 * @freq: OPP frequency to adjust voltage of
2576 * @u_volt: new OPP target voltage
2577 * @u_volt_min: new OPP min voltage
2578 * @u_volt_max: new OPP max voltage
2580 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2581 * copy operation, returns 0 if no modifcation was done OR modification was
2584 int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
2585 unsigned long u_volt, unsigned long u_volt_min,
2586 unsigned long u_volt_max)
2589 struct opp_table *opp_table;
2590 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
2593 /* Find the opp_table */
2594 opp_table = _find_opp_table(dev);
2595 if (IS_ERR(opp_table)) {
2596 r = PTR_ERR(opp_table);
2597 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
2601 mutex_lock(&opp_table->lock);
2603 /* Do we have the frequency? */
2604 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
2605 if (tmp_opp->rate == freq) {
2616 /* Is update really needed? */
2617 if (opp->supplies->u_volt == u_volt)
2620 opp->supplies->u_volt = u_volt;
2621 opp->supplies->u_volt_min = u_volt_min;
2622 opp->supplies->u_volt_max = u_volt_max;
2624 dev_pm_opp_get(opp);
2625 mutex_unlock(&opp_table->lock);
2627 /* Notify the voltage change of the OPP */
2628 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE,
2631 dev_pm_opp_put(opp);
2632 goto adjust_put_table;
2635 mutex_unlock(&opp_table->lock);
2637 dev_pm_opp_put_opp_table(opp_table);
2640 EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);
2643 * dev_pm_opp_enable() - Enable a specific OPP
2644 * @dev: device for which we do this operation
2645 * @freq: OPP frequency to enable
2647 * Enables a provided opp. If the operation is valid, this returns 0, else the
2648 * corresponding error value. It is meant to be used for users an OPP available
2649 * after being temporarily made unavailable with dev_pm_opp_disable.
2651 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2652 * copy operation, returns 0 if no modification was done OR modification was
2655 int dev_pm_opp_enable(struct device *dev, unsigned long freq)
2657 return _opp_set_availability(dev, freq, true);
2659 EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
2662 * dev_pm_opp_disable() - Disable a specific OPP
2663 * @dev: device for which we do this operation
2664 * @freq: OPP frequency to disable
2666 * Disables a provided opp. If the operation is valid, this returns
2667 * 0, else the corresponding error value. It is meant to be a temporary
2668 * control by users to make this OPP not available until the circumstances are
2669 * right to make it available again (with a call to dev_pm_opp_enable).
2671 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2672 * copy operation, returns 0 if no modification was done OR modification was
2675 int dev_pm_opp_disable(struct device *dev, unsigned long freq)
2677 return _opp_set_availability(dev, freq, false);
2679 EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
2682 * dev_pm_opp_register_notifier() - Register OPP notifier for the device
2683 * @dev: Device for which notifier needs to be registered
2684 * @nb: Notifier block to be registered
2686 * Return: 0 on success or a negative error value.
2688 int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
2690 struct opp_table *opp_table;
2693 opp_table = _find_opp_table(dev);
2694 if (IS_ERR(opp_table))
2695 return PTR_ERR(opp_table);
2697 ret = blocking_notifier_chain_register(&opp_table->head, nb);
2699 dev_pm_opp_put_opp_table(opp_table);
2703 EXPORT_SYMBOL(dev_pm_opp_register_notifier);
2706 * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
2707 * @dev: Device for which notifier needs to be unregistered
2708 * @nb: Notifier block to be unregistered
2710 * Return: 0 on success or a negative error value.
2712 int dev_pm_opp_unregister_notifier(struct device *dev,
2713 struct notifier_block *nb)
2715 struct opp_table *opp_table;
2718 opp_table = _find_opp_table(dev);
2719 if (IS_ERR(opp_table))
2720 return PTR_ERR(opp_table);
2722 ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
2724 dev_pm_opp_put_opp_table(opp_table);
2728 EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
2731 * dev_pm_opp_remove_table() - Free all OPPs associated with the device
2732 * @dev: device pointer used to lookup OPP table.
2734 * Free both OPPs created using static entries present in DT and the
2735 * dynamically added entries.
2737 void dev_pm_opp_remove_table(struct device *dev)
2739 struct opp_table *opp_table;
2741 /* Check for existing table for 'dev' */
2742 opp_table = _find_opp_table(dev);
2743 if (IS_ERR(opp_table)) {
2744 int error = PTR_ERR(opp_table);
2746 if (error != -ENODEV)
2747 WARN(1, "%s: opp_table: %d\n",
2748 IS_ERR_OR_NULL(dev) ?
2749 "Invalid device" : dev_name(dev),
2755 * Drop the extra reference only if the OPP table was successfully added
2756 * with dev_pm_opp_of_add_table() earlier.
2758 if (_opp_remove_all_static(opp_table))
2759 dev_pm_opp_put_opp_table(opp_table);
2761 /* Drop reference taken by _find_opp_table() */
2762 dev_pm_opp_put_opp_table(opp_table);
2764 EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
2767 * dev_pm_opp_sync_regulators() - Sync state of voltage regulators
2768 * @dev: device for which we do this operation
2770 * Sync voltage state of the OPP table regulators.
2772 * Return: 0 on success or a negative error value.
2774 int dev_pm_opp_sync_regulators(struct device *dev)
2776 struct opp_table *opp_table;
2777 struct regulator *reg;
2780 /* Device may not have OPP table */
2781 opp_table = _find_opp_table(dev);
2782 if (IS_ERR(opp_table))
2785 /* Regulator may not be required for the device */
2786 if (unlikely(!opp_table->regulators))
2789 /* Nothing to sync if voltage wasn't changed */
2790 if (!opp_table->enabled)
2793 for (i = 0; i < opp_table->regulator_count; i++) {
2794 reg = opp_table->regulators[i];
2795 ret = regulator_sync_voltage(reg);
2800 /* Drop reference taken by _find_opp_table() */
2801 dev_pm_opp_put_opp_table(opp_table);
2805 EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);