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);
30 /* Lock to allow exclusive modification to the device and opp lists */
31 DEFINE_MUTEX(opp_table_lock);
33 static struct opp_device *_find_opp_dev(const struct device *dev,
34 struct opp_table *opp_table)
36 struct opp_device *opp_dev;
38 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
39 if (opp_dev->dev == dev)
45 static struct opp_table *_find_opp_table_unlocked(struct device *dev)
47 struct opp_table *opp_table;
50 list_for_each_entry(opp_table, &opp_tables, node) {
51 mutex_lock(&opp_table->lock);
52 found = !!_find_opp_dev(dev, opp_table);
53 mutex_unlock(&opp_table->lock);
56 _get_opp_table_kref(opp_table);
62 return ERR_PTR(-ENODEV);
66 * _find_opp_table() - find opp_table struct using device pointer
67 * @dev: device pointer used to lookup OPP table
69 * Search OPP table for one containing matching device.
71 * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
72 * -EINVAL based on type of error.
74 * The callers must call dev_pm_opp_put_opp_table() after the table is used.
76 struct opp_table *_find_opp_table(struct device *dev)
78 struct opp_table *opp_table;
80 if (IS_ERR_OR_NULL(dev)) {
81 pr_err("%s: Invalid parameters\n", __func__);
82 return ERR_PTR(-EINVAL);
85 mutex_lock(&opp_table_lock);
86 opp_table = _find_opp_table_unlocked(dev);
87 mutex_unlock(&opp_table_lock);
93 * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
94 * @opp: opp for which voltage has to be returned for
96 * Return: voltage in micro volt corresponding to the opp, else
99 * This is useful only for devices with single power supply.
101 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
103 if (IS_ERR_OR_NULL(opp)) {
104 pr_err("%s: Invalid parameters\n", __func__);
108 return opp->supplies[0].u_volt;
110 EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
113 * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
114 * @opp: opp for which frequency has to be returned for
116 * Return: frequency in hertz corresponding to the opp, else
119 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
121 if (IS_ERR_OR_NULL(opp)) {
122 pr_err("%s: Invalid parameters\n", __func__);
128 EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
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
134 * Return: level read from device tree corresponding to the opp, else
137 unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
139 if (IS_ERR_OR_NULL(opp) || !opp->available) {
140 pr_err("%s: Invalid parameters\n", __func__);
146 EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
149 * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
150 * @opp: opp for which turbo mode is being verified
152 * Turbo OPPs are not for normal use, and can be enabled (under certain
153 * conditions) for short duration of times to finish high throughput work
154 * quickly. Running on them for longer times may overheat the chip.
156 * Return: true if opp is turbo opp, else false.
158 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
160 if (IS_ERR_OR_NULL(opp) || !opp->available) {
161 pr_err("%s: Invalid parameters\n", __func__);
167 EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
170 * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
171 * @dev: device for which we do this operation
173 * Return: This function returns the max clock latency in nanoseconds.
175 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
177 struct opp_table *opp_table;
178 unsigned long clock_latency_ns;
180 opp_table = _find_opp_table(dev);
181 if (IS_ERR(opp_table))
184 clock_latency_ns = opp_table->clock_latency_ns_max;
186 dev_pm_opp_put_opp_table(opp_table);
188 return clock_latency_ns;
190 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
193 * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
194 * @dev: device for which we do this operation
196 * Return: This function returns the max voltage latency in nanoseconds.
198 unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
200 struct opp_table *opp_table;
201 struct dev_pm_opp *opp;
202 struct regulator *reg;
203 unsigned long latency_ns = 0;
210 opp_table = _find_opp_table(dev);
211 if (IS_ERR(opp_table))
214 /* Regulator may not be required for the device */
215 if (!opp_table->regulators)
218 count = opp_table->regulator_count;
220 uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
224 mutex_lock(&opp_table->lock);
226 for (i = 0; i < count; i++) {
230 list_for_each_entry(opp, &opp_table->opp_list, node) {
234 if (opp->supplies[i].u_volt_min < uV[i].min)
235 uV[i].min = opp->supplies[i].u_volt_min;
236 if (opp->supplies[i].u_volt_max > uV[i].max)
237 uV[i].max = opp->supplies[i].u_volt_max;
241 mutex_unlock(&opp_table->lock);
244 * The caller needs to ensure that opp_table (and hence the regulator)
245 * isn't freed, while we are executing this routine.
247 for (i = 0; i < count; i++) {
248 reg = opp_table->regulators[i];
249 ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
251 latency_ns += ret * 1000;
256 dev_pm_opp_put_opp_table(opp_table);
260 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
263 * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
265 * @dev: device for which we do this operation
267 * Return: This function returns the max transition latency, in nanoseconds, to
268 * switch from one OPP to other.
270 unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
272 return dev_pm_opp_get_max_volt_latency(dev) +
273 dev_pm_opp_get_max_clock_latency(dev);
275 EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
278 * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
279 * @dev: device for which we do this operation
281 * Return: This function returns the frequency of the OPP marked as suspend_opp
282 * if one is available, else returns 0;
284 unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
286 struct opp_table *opp_table;
287 unsigned long freq = 0;
289 opp_table = _find_opp_table(dev);
290 if (IS_ERR(opp_table))
293 if (opp_table->suspend_opp && opp_table->suspend_opp->available)
294 freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
296 dev_pm_opp_put_opp_table(opp_table);
300 EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
302 int _get_opp_count(struct opp_table *opp_table)
304 struct dev_pm_opp *opp;
307 mutex_lock(&opp_table->lock);
309 list_for_each_entry(opp, &opp_table->opp_list, node) {
314 mutex_unlock(&opp_table->lock);
320 * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
321 * @dev: device for which we do this operation
323 * Return: This function returns the number of available opps if there are any,
324 * else returns 0 if none or the corresponding error value.
326 int dev_pm_opp_get_opp_count(struct device *dev)
328 struct opp_table *opp_table;
331 opp_table = _find_opp_table(dev);
332 if (IS_ERR(opp_table)) {
333 count = PTR_ERR(opp_table);
334 dev_dbg(dev, "%s: OPP table not found (%d)\n",
339 count = _get_opp_count(opp_table);
340 dev_pm_opp_put_opp_table(opp_table);
344 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
347 * dev_pm_opp_find_freq_exact() - search for an exact frequency
348 * @dev: device for which we do this operation
349 * @freq: frequency to search for
350 * @available: true/false - match for available opp
352 * Return: Searches for exact match in the opp table and returns pointer to the
353 * matching opp if found, else returns ERR_PTR in case of error and should
354 * be handled using IS_ERR. Error return values can be:
355 * EINVAL: for bad pointer
356 * ERANGE: no match found for search
357 * ENODEV: if device not found in list of registered devices
359 * Note: available is a modifier for the search. if available=true, then the
360 * match is for exact matching frequency and is available in the stored OPP
361 * table. if false, the match is for exact frequency which is not available.
363 * This provides a mechanism to enable an opp which is not available currently
364 * or the opposite as well.
366 * The callers are required to call dev_pm_opp_put() for the returned OPP after
369 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
373 struct opp_table *opp_table;
374 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
376 opp_table = _find_opp_table(dev);
377 if (IS_ERR(opp_table)) {
378 int r = PTR_ERR(opp_table);
380 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
384 mutex_lock(&opp_table->lock);
386 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
387 if (temp_opp->available == available &&
388 temp_opp->rate == freq) {
391 /* Increment the reference count of OPP */
397 mutex_unlock(&opp_table->lock);
398 dev_pm_opp_put_opp_table(opp_table);
402 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
405 * dev_pm_opp_find_level_exact() - search for an exact level
406 * @dev: device for which we do this operation
407 * @level: level to search for
409 * Return: Searches for exact match in the opp table and returns pointer to the
410 * matching opp if found, else returns ERR_PTR in case of error and should
411 * be handled using IS_ERR. Error return values can be:
412 * EINVAL: for bad pointer
413 * ERANGE: no match found for search
414 * ENODEV: if device not found in list of registered devices
416 * The callers are required to call dev_pm_opp_put() for the returned OPP after
419 struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
422 struct opp_table *opp_table;
423 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
425 opp_table = _find_opp_table(dev);
426 if (IS_ERR(opp_table)) {
427 int r = PTR_ERR(opp_table);
429 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
433 mutex_lock(&opp_table->lock);
435 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
436 if (temp_opp->level == level) {
439 /* Increment the reference count of OPP */
445 mutex_unlock(&opp_table->lock);
446 dev_pm_opp_put_opp_table(opp_table);
450 EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
452 static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
455 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
457 mutex_lock(&opp_table->lock);
459 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
460 if (temp_opp->available && temp_opp->rate >= *freq) {
464 /* Increment the reference count of OPP */
470 mutex_unlock(&opp_table->lock);
476 * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
477 * @dev: device for which we do this operation
478 * @freq: Start frequency
480 * Search for the matching ceil *available* OPP from a starting freq
483 * Return: matching *opp and refreshes *freq accordingly, else returns
484 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
486 * EINVAL: for bad pointer
487 * ERANGE: no match found for search
488 * ENODEV: if device not found in list of registered devices
490 * The callers are required to call dev_pm_opp_put() for the returned OPP after
493 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
496 struct opp_table *opp_table;
497 struct dev_pm_opp *opp;
500 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
501 return ERR_PTR(-EINVAL);
504 opp_table = _find_opp_table(dev);
505 if (IS_ERR(opp_table))
506 return ERR_CAST(opp_table);
508 opp = _find_freq_ceil(opp_table, freq);
510 dev_pm_opp_put_opp_table(opp_table);
514 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
517 * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
518 * @dev: device for which we do this operation
519 * @freq: Start frequency
521 * Search for the matching floor *available* OPP from a starting freq
524 * Return: matching *opp and refreshes *freq accordingly, else returns
525 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
527 * EINVAL: for bad pointer
528 * ERANGE: no match found for search
529 * ENODEV: if device not found in list of registered devices
531 * The callers are required to call dev_pm_opp_put() for the returned OPP after
534 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
537 struct opp_table *opp_table;
538 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
541 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
542 return ERR_PTR(-EINVAL);
545 opp_table = _find_opp_table(dev);
546 if (IS_ERR(opp_table))
547 return ERR_CAST(opp_table);
549 mutex_lock(&opp_table->lock);
551 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
552 if (temp_opp->available) {
553 /* go to the next node, before choosing prev */
554 if (temp_opp->rate > *freq)
561 /* Increment the reference count of OPP */
564 mutex_unlock(&opp_table->lock);
565 dev_pm_opp_put_opp_table(opp_table);
572 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
575 * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
577 * @dev: Device for which we do this operation.
578 * @u_volt: Target voltage.
580 * Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
582 * Return: matching *opp, else returns ERR_PTR in case of error which should be
583 * handled using IS_ERR.
585 * Error return values can be:
586 * EINVAL: bad parameters
588 * The callers are required to call dev_pm_opp_put() for the returned OPP after
591 struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
592 unsigned long u_volt)
594 struct opp_table *opp_table;
595 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
597 if (!dev || !u_volt) {
598 dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__,
600 return ERR_PTR(-EINVAL);
603 opp_table = _find_opp_table(dev);
604 if (IS_ERR(opp_table))
605 return ERR_CAST(opp_table);
607 mutex_lock(&opp_table->lock);
609 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
610 if (temp_opp->available) {
611 if (temp_opp->supplies[0].u_volt > u_volt)
617 /* Increment the reference count of OPP */
621 mutex_unlock(&opp_table->lock);
622 dev_pm_opp_put_opp_table(opp_table);
626 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);
628 static int _set_opp_voltage(struct device *dev, struct regulator *reg,
629 struct dev_pm_opp_supply *supply)
633 /* Regulator not available for device */
635 dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
640 dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
641 supply->u_volt_min, supply->u_volt, supply->u_volt_max);
643 ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
644 supply->u_volt, supply->u_volt_max);
646 dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
647 __func__, supply->u_volt_min, supply->u_volt,
648 supply->u_volt_max, ret);
653 static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
658 ret = clk_set_rate(clk, freq);
660 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
667 static int _generic_set_opp_regulator(struct opp_table *opp_table,
669 unsigned long old_freq,
671 struct dev_pm_opp_supply *old_supply,
672 struct dev_pm_opp_supply *new_supply)
674 struct regulator *reg = opp_table->regulators[0];
677 /* This function only supports single regulator per device */
678 if (WARN_ON(opp_table->regulator_count > 1)) {
679 dev_err(dev, "multiple regulators are not supported\n");
683 /* Scaling up? Scale voltage before frequency */
684 if (freq >= old_freq) {
685 ret = _set_opp_voltage(dev, reg, new_supply);
687 goto restore_voltage;
690 /* Change frequency */
691 ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
693 goto restore_voltage;
695 /* Scaling down? Scale voltage after frequency */
696 if (freq < old_freq) {
697 ret = _set_opp_voltage(dev, reg, new_supply);
703 * Enable the regulator after setting its voltages, otherwise it breaks
704 * some boot-enabled regulators.
706 if (unlikely(!opp_table->regulator_enabled)) {
707 ret = regulator_enable(reg);
709 dev_warn(dev, "Failed to enable regulator: %d", ret);
711 opp_table->regulator_enabled = true;
717 if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq))
718 dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
721 /* This shouldn't harm even if the voltages weren't updated earlier */
723 _set_opp_voltage(dev, reg, old_supply);
728 static int _set_opp_bw(const struct opp_table *opp_table,
729 struct dev_pm_opp *opp, struct device *dev, bool remove)
734 if (!opp_table->paths)
737 for (i = 0; i < opp_table->path_count; i++) {
742 avg = opp->bandwidth[i].avg;
743 peak = opp->bandwidth[i].peak;
745 ret = icc_set_bw(opp_table->paths[i], avg, peak);
747 dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
748 remove ? "remove" : "set", i, ret);
756 static int _set_opp_custom(const struct opp_table *opp_table,
757 struct device *dev, unsigned long old_freq,
759 struct dev_pm_opp_supply *old_supply,
760 struct dev_pm_opp_supply *new_supply)
762 struct dev_pm_set_opp_data *data;
765 data = opp_table->set_opp_data;
766 data->regulators = opp_table->regulators;
767 data->regulator_count = opp_table->regulator_count;
768 data->clk = opp_table->clk;
771 data->old_opp.rate = old_freq;
772 size = sizeof(*old_supply) * opp_table->regulator_count;
774 memset(data->old_opp.supplies, 0, size);
776 memcpy(data->old_opp.supplies, old_supply, size);
778 data->new_opp.rate = freq;
779 memcpy(data->new_opp.supplies, new_supply, size);
781 return opp_table->set_opp(data);
784 /* This is only called for PM domain for now */
785 static int _set_required_opps(struct device *dev,
786 struct opp_table *opp_table,
787 struct dev_pm_opp *opp)
789 struct opp_table **required_opp_tables = opp_table->required_opp_tables;
790 struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
794 if (!required_opp_tables)
797 /* Single genpd case */
798 if (!genpd_virt_devs) {
799 pstate = likely(opp) ? opp->required_opps[0]->pstate : 0;
800 ret = dev_pm_genpd_set_performance_state(dev, pstate);
802 dev_err(dev, "Failed to set performance state of %s: %d (%d)\n",
803 dev_name(dev), pstate, ret);
808 /* Multiple genpd case */
811 * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
812 * after it is freed from another thread.
814 mutex_lock(&opp_table->genpd_virt_dev_lock);
816 for (i = 0; i < opp_table->required_opp_count; i++) {
817 pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
819 if (!genpd_virt_devs[i])
822 ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate);
824 dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
825 dev_name(genpd_virt_devs[i]), pstate, ret);
829 mutex_unlock(&opp_table->genpd_virt_dev_lock);
835 * dev_pm_opp_set_bw() - sets bandwidth levels corresponding to an opp
836 * @dev: device for which we do this operation
837 * @opp: opp based on which the bandwidth levels are to be configured
839 * This configures the bandwidth to the levels specified by the OPP. However
840 * if the OPP specified is NULL the bandwidth levels are cleared out.
842 * Return: 0 on success or a negative error value.
844 int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp)
846 struct opp_table *opp_table;
849 opp_table = _find_opp_table(dev);
850 if (IS_ERR(opp_table)) {
851 dev_err(dev, "%s: device opp table doesn't exist\n", __func__);
852 return PTR_ERR(opp_table);
856 ret = _set_opp_bw(opp_table, opp, dev, false);
858 ret = _set_opp_bw(opp_table, NULL, dev, true);
860 dev_pm_opp_put_opp_table(opp_table);
863 EXPORT_SYMBOL_GPL(dev_pm_opp_set_bw);
866 * dev_pm_opp_set_rate() - Configure new OPP based on frequency
867 * @dev: device for which we do this operation
868 * @target_freq: frequency to achieve
870 * This configures the power-supplies to the levels specified by the OPP
871 * corresponding to the target_freq, and programs the clock to a value <=
872 * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax
873 * provided by the opp, should have already rounded to the target OPP's
876 int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
878 struct opp_table *opp_table;
879 unsigned long freq, old_freq, temp_freq;
880 struct dev_pm_opp *old_opp, *opp;
884 opp_table = _find_opp_table(dev);
885 if (IS_ERR(opp_table)) {
886 dev_err(dev, "%s: device opp doesn't exist\n", __func__);
887 return PTR_ERR(opp_table);
890 if (unlikely(!target_freq)) {
892 * Some drivers need to support cases where some platforms may
893 * have OPP table for the device, while others don't and
894 * opp_set_rate() just needs to behave like clk_set_rate().
896 if (!_get_opp_count(opp_table)) {
901 if (!opp_table->required_opp_tables && !opp_table->regulators &&
903 dev_err(dev, "target frequency can't be 0\n");
908 ret = _set_opp_bw(opp_table, NULL, dev, true);
912 if (opp_table->regulator_enabled) {
913 regulator_disable(opp_table->regulators[0]);
914 opp_table->regulator_enabled = false;
917 ret = _set_required_opps(dev, opp_table, NULL);
921 clk = opp_table->clk;
923 dev_err(dev, "%s: No clock available for the device\n",
929 freq = clk_round_rate(clk, target_freq);
933 old_freq = clk_get_rate(clk);
935 /* Return early if nothing to do */
936 if (old_freq == freq) {
937 dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n",
944 * For IO devices which require an OPP on some platforms/SoCs
945 * while just needing to scale the clock on some others
946 * we look for empty OPP tables with just a clock handle and
947 * scale only the clk. This makes dev_pm_opp_set_rate()
948 * equivalent to a clk_set_rate()
950 if (!_get_opp_count(opp_table)) {
951 ret = _generic_set_opp_clk_only(dev, clk, freq);
955 temp_freq = old_freq;
956 old_opp = _find_freq_ceil(opp_table, &temp_freq);
957 if (IS_ERR(old_opp)) {
958 dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n",
959 __func__, old_freq, PTR_ERR(old_opp));
963 opp = _find_freq_ceil(opp_table, &temp_freq);
966 dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
967 __func__, freq, ret);
971 dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__,
974 /* Scaling up? Configure required OPPs before frequency */
975 if (freq >= old_freq) {
976 ret = _set_required_opps(dev, opp_table, opp);
981 if (opp_table->set_opp) {
982 ret = _set_opp_custom(opp_table, dev, old_freq, freq,
983 IS_ERR(old_opp) ? NULL : old_opp->supplies,
985 } else if (opp_table->regulators) {
986 ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq,
987 IS_ERR(old_opp) ? NULL : old_opp->supplies,
990 /* Only frequency scaling */
991 ret = _generic_set_opp_clk_only(dev, clk, freq);
994 /* Scaling down? Configure required OPPs after frequency */
995 if (!ret && freq < old_freq) {
996 ret = _set_required_opps(dev, opp_table, opp);
998 dev_err(dev, "Failed to set required opps: %d\n", ret);
1002 ret = _set_opp_bw(opp_table, opp, dev, false);
1005 dev_pm_opp_put(opp);
1007 if (!IS_ERR(old_opp))
1008 dev_pm_opp_put(old_opp);
1010 dev_pm_opp_put_opp_table(opp_table);
1013 EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
1015 /* OPP-dev Helpers */
1016 static void _remove_opp_dev(struct opp_device *opp_dev,
1017 struct opp_table *opp_table)
1019 opp_debug_unregister(opp_dev, opp_table);
1020 list_del(&opp_dev->node);
1024 static struct opp_device *_add_opp_dev_unlocked(const struct device *dev,
1025 struct opp_table *opp_table)
1027 struct opp_device *opp_dev;
1029 opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
1033 /* Initialize opp-dev */
1036 list_add(&opp_dev->node, &opp_table->dev_list);
1038 /* Create debugfs entries for the opp_table */
1039 opp_debug_register(opp_dev, opp_table);
1044 struct opp_device *_add_opp_dev(const struct device *dev,
1045 struct opp_table *opp_table)
1047 struct opp_device *opp_dev;
1049 mutex_lock(&opp_table->lock);
1050 opp_dev = _add_opp_dev_unlocked(dev, opp_table);
1051 mutex_unlock(&opp_table->lock);
1056 static struct opp_table *_allocate_opp_table(struct device *dev, int index)
1058 struct opp_table *opp_table;
1059 struct opp_device *opp_dev;
1063 * Allocate a new OPP table. In the infrequent case where a new
1064 * device is needed to be added, we pay this penalty.
1066 opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
1070 mutex_init(&opp_table->lock);
1071 mutex_init(&opp_table->genpd_virt_dev_lock);
1072 INIT_LIST_HEAD(&opp_table->dev_list);
1074 /* Mark regulator count uninitialized */
1075 opp_table->regulator_count = -1;
1077 opp_dev = _add_opp_dev(dev, opp_table);
1083 _of_init_opp_table(opp_table, dev, index);
1085 /* Find clk for the device */
1086 opp_table->clk = clk_get(dev, NULL);
1087 if (IS_ERR(opp_table->clk)) {
1088 ret = PTR_ERR(opp_table->clk);
1089 if (ret != -EPROBE_DEFER)
1090 dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__,
1094 /* Find interconnect path(s) for the device */
1095 ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
1097 dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
1100 BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
1101 INIT_LIST_HEAD(&opp_table->opp_list);
1102 kref_init(&opp_table->kref);
1104 /* Secure the device table modification */
1105 list_add(&opp_table->node, &opp_tables);
1109 void _get_opp_table_kref(struct opp_table *opp_table)
1111 kref_get(&opp_table->kref);
1114 static struct opp_table *_opp_get_opp_table(struct device *dev, int index)
1116 struct opp_table *opp_table;
1118 /* Hold our table modification lock here */
1119 mutex_lock(&opp_table_lock);
1121 opp_table = _find_opp_table_unlocked(dev);
1122 if (!IS_ERR(opp_table))
1125 opp_table = _managed_opp(dev, index);
1127 if (!_add_opp_dev_unlocked(dev, opp_table)) {
1128 dev_pm_opp_put_opp_table(opp_table);
1134 opp_table = _allocate_opp_table(dev, index);
1137 mutex_unlock(&opp_table_lock);
1142 struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
1144 return _opp_get_opp_table(dev, 0);
1146 EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
1148 struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev,
1151 return _opp_get_opp_table(dev, index);
1154 static void _opp_table_kref_release(struct kref *kref)
1156 struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
1157 struct opp_device *opp_dev, *temp;
1160 _of_clear_opp_table(opp_table);
1163 if (!IS_ERR(opp_table->clk))
1164 clk_put(opp_table->clk);
1166 if (opp_table->paths) {
1167 for (i = 0; i < opp_table->path_count; i++)
1168 icc_put(opp_table->paths[i]);
1169 kfree(opp_table->paths);
1172 WARN_ON(!list_empty(&opp_table->opp_list));
1174 list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
1176 * The OPP table is getting removed, drop the performance state
1179 if (opp_table->genpd_performance_state)
1180 dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);
1182 _remove_opp_dev(opp_dev, opp_table);
1185 mutex_destroy(&opp_table->genpd_virt_dev_lock);
1186 mutex_destroy(&opp_table->lock);
1187 list_del(&opp_table->node);
1190 mutex_unlock(&opp_table_lock);
1193 void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
1195 kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
1198 EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
1200 void _opp_free(struct dev_pm_opp *opp)
1205 static void _opp_kref_release(struct dev_pm_opp *opp,
1206 struct opp_table *opp_table)
1209 * Notify the changes in the availability of the operable
1210 * frequency/voltage list.
1212 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
1213 _of_opp_free_required_opps(opp_table, opp);
1214 opp_debug_remove_one(opp);
1215 list_del(&opp->node);
1219 static void _opp_kref_release_unlocked(struct kref *kref)
1221 struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
1222 struct opp_table *opp_table = opp->opp_table;
1224 _opp_kref_release(opp, opp_table);
1227 static void _opp_kref_release_locked(struct kref *kref)
1229 struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
1230 struct opp_table *opp_table = opp->opp_table;
1232 _opp_kref_release(opp, opp_table);
1233 mutex_unlock(&opp_table->lock);
1236 void dev_pm_opp_get(struct dev_pm_opp *opp)
1238 kref_get(&opp->kref);
1241 void dev_pm_opp_put(struct dev_pm_opp *opp)
1243 kref_put_mutex(&opp->kref, _opp_kref_release_locked,
1244 &opp->opp_table->lock);
1246 EXPORT_SYMBOL_GPL(dev_pm_opp_put);
1248 static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp)
1250 kref_put(&opp->kref, _opp_kref_release_unlocked);
1254 * dev_pm_opp_remove() - Remove an OPP from OPP table
1255 * @dev: device for which we do this operation
1256 * @freq: OPP to remove with matching 'freq'
1258 * This function removes an opp from the opp table.
1260 void dev_pm_opp_remove(struct device *dev, unsigned long freq)
1262 struct dev_pm_opp *opp;
1263 struct opp_table *opp_table;
1266 opp_table = _find_opp_table(dev);
1267 if (IS_ERR(opp_table))
1270 mutex_lock(&opp_table->lock);
1272 list_for_each_entry(opp, &opp_table->opp_list, node) {
1273 if (opp->rate == freq) {
1279 mutex_unlock(&opp_table->lock);
1282 dev_pm_opp_put(opp);
1284 /* Drop the reference taken by dev_pm_opp_add() */
1285 dev_pm_opp_put_opp_table(opp_table);
1287 dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
1291 /* Drop the reference taken by _find_opp_table() */
1292 dev_pm_opp_put_opp_table(opp_table);
1294 EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
1296 void _opp_remove_all_static(struct opp_table *opp_table)
1298 struct dev_pm_opp *opp, *tmp;
1300 mutex_lock(&opp_table->lock);
1302 if (!opp_table->parsed_static_opps || --opp_table->parsed_static_opps)
1305 list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
1307 dev_pm_opp_put_unlocked(opp);
1311 mutex_unlock(&opp_table->lock);
1315 * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
1316 * @dev: device for which we do this operation
1318 * This function removes all dynamically created OPPs from the opp table.
1320 void dev_pm_opp_remove_all_dynamic(struct device *dev)
1322 struct opp_table *opp_table;
1323 struct dev_pm_opp *opp, *temp;
1326 opp_table = _find_opp_table(dev);
1327 if (IS_ERR(opp_table))
1330 mutex_lock(&opp_table->lock);
1331 list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) {
1333 dev_pm_opp_put_unlocked(opp);
1337 mutex_unlock(&opp_table->lock);
1339 /* Drop the references taken by dev_pm_opp_add() */
1341 dev_pm_opp_put_opp_table(opp_table);
1343 /* Drop the reference taken by _find_opp_table() */
1344 dev_pm_opp_put_opp_table(opp_table);
1346 EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
1348 struct dev_pm_opp *_opp_allocate(struct opp_table *table)
1350 struct dev_pm_opp *opp;
1351 int supply_count, supply_size, icc_size;
1353 /* Allocate space for at least one supply */
1354 supply_count = table->regulator_count > 0 ? table->regulator_count : 1;
1355 supply_size = sizeof(*opp->supplies) * supply_count;
1356 icc_size = sizeof(*opp->bandwidth) * table->path_count;
1358 /* allocate new OPP node and supplies structures */
1359 opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL);
1364 /* Put the supplies at the end of the OPP structure as an empty array */
1365 opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
1367 opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count);
1368 INIT_LIST_HEAD(&opp->node);
1373 static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
1374 struct opp_table *opp_table)
1376 struct regulator *reg;
1379 if (!opp_table->regulators)
1382 for (i = 0; i < opp_table->regulator_count; i++) {
1383 reg = opp_table->regulators[i];
1385 if (!regulator_is_supported_voltage(reg,
1386 opp->supplies[i].u_volt_min,
1387 opp->supplies[i].u_volt_max)) {
1388 pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
1389 __func__, opp->supplies[i].u_volt_min,
1390 opp->supplies[i].u_volt_max);
1398 int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
1400 if (opp1->rate != opp2->rate)
1401 return opp1->rate < opp2->rate ? -1 : 1;
1402 if (opp1->bandwidth && opp2->bandwidth &&
1403 opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
1404 return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;
1405 if (opp1->level != opp2->level)
1406 return opp1->level < opp2->level ? -1 : 1;
1410 static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
1411 struct opp_table *opp_table,
1412 struct list_head **head)
1414 struct dev_pm_opp *opp;
1418 * Insert new OPP in order of increasing frequency and discard if
1421 * Need to use &opp_table->opp_list in the condition part of the 'for'
1422 * loop, don't replace it with head otherwise it will become an infinite
1425 list_for_each_entry(opp, &opp_table->opp_list, node) {
1426 opp_cmp = _opp_compare_key(new_opp, opp);
1435 /* Duplicate OPPs */
1436 dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
1437 __func__, opp->rate, opp->supplies[0].u_volt,
1438 opp->available, new_opp->rate,
1439 new_opp->supplies[0].u_volt, new_opp->available);
1441 /* Should we compare voltages for all regulators here ? */
1442 return opp->available &&
1443 new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
1451 * 0: On success. And appropriate error message for duplicate OPPs.
1452 * -EBUSY: For OPP with same freq/volt and is available. The callers of
1453 * _opp_add() must return 0 if they receive -EBUSY from it. This is to make
1454 * sure we don't print error messages unnecessarily if different parts of
1455 * kernel try to initialize the OPP table.
1456 * -EEXIST: For OPP with same freq but different volt or is unavailable. This
1457 * should be considered an error by the callers of _opp_add().
1459 int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
1460 struct opp_table *opp_table, bool rate_not_available)
1462 struct list_head *head;
1465 mutex_lock(&opp_table->lock);
1466 head = &opp_table->opp_list;
1468 if (likely(!rate_not_available)) {
1469 ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
1471 mutex_unlock(&opp_table->lock);
1476 list_add(&new_opp->node, head);
1477 mutex_unlock(&opp_table->lock);
1479 new_opp->opp_table = opp_table;
1480 kref_init(&new_opp->kref);
1482 opp_debug_create_one(new_opp, opp_table);
1484 if (!_opp_supported_by_regulators(new_opp, opp_table)) {
1485 new_opp->available = false;
1486 dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
1487 __func__, new_opp->rate);
1494 * _opp_add_v1() - Allocate a OPP based on v1 bindings.
1495 * @opp_table: OPP table
1496 * @dev: device for which we do this operation
1497 * @freq: Frequency in Hz for this OPP
1498 * @u_volt: Voltage in uVolts for this OPP
1499 * @dynamic: Dynamically added OPPs.
1501 * This function adds an opp definition to the opp table and returns status.
1502 * The opp is made available by default and it can be controlled using
1503 * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
1505 * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
1506 * and freed by dev_pm_opp_of_remove_table.
1510 * Duplicate OPPs (both freq and volt are same) and opp->available
1511 * -EEXIST Freq are same and volt are different OR
1512 * Duplicate OPPs (both freq and volt are same) and !opp->available
1513 * -ENOMEM Memory allocation failure
1515 int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
1516 unsigned long freq, long u_volt, bool dynamic)
1518 struct dev_pm_opp *new_opp;
1522 new_opp = _opp_allocate(opp_table);
1526 /* populate the opp table */
1527 new_opp->rate = freq;
1528 tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
1529 new_opp->supplies[0].u_volt = u_volt;
1530 new_opp->supplies[0].u_volt_min = u_volt - tol;
1531 new_opp->supplies[0].u_volt_max = u_volt + tol;
1532 new_opp->available = true;
1533 new_opp->dynamic = dynamic;
1535 ret = _opp_add(dev, new_opp, opp_table, false);
1537 /* Don't return error for duplicate OPPs */
1544 * Notify the changes in the availability of the operable
1545 * frequency/voltage list.
1547 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
1557 * dev_pm_opp_set_supported_hw() - Set supported platforms
1558 * @dev: Device for which supported-hw has to be set.
1559 * @versions: Array of hierarchy of versions to match.
1560 * @count: Number of elements in the array.
1562 * This is required only for the V2 bindings, and it enables a platform to
1563 * specify the hierarchy of versions it supports. OPP layer will then enable
1564 * OPPs, which are available for those versions, based on its 'opp-supported-hw'
1567 struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
1568 const u32 *versions, unsigned int count)
1570 struct opp_table *opp_table;
1572 opp_table = dev_pm_opp_get_opp_table(dev);
1574 return ERR_PTR(-ENOMEM);
1576 /* Make sure there are no concurrent readers while updating opp_table */
1577 WARN_ON(!list_empty(&opp_table->opp_list));
1579 /* Another CPU that shares the OPP table has set the property ? */
1580 if (opp_table->supported_hw)
1583 opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
1585 if (!opp_table->supported_hw) {
1586 dev_pm_opp_put_opp_table(opp_table);
1587 return ERR_PTR(-ENOMEM);
1590 opp_table->supported_hw_count = count;
1594 EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
1597 * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw
1598 * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().
1600 * This is required only for the V2 bindings, and is called for a matching
1601 * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
1602 * will not be freed.
1604 void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
1606 /* Make sure there are no concurrent readers while updating opp_table */
1607 WARN_ON(!list_empty(&opp_table->opp_list));
1609 kfree(opp_table->supported_hw);
1610 opp_table->supported_hw = NULL;
1611 opp_table->supported_hw_count = 0;
1613 dev_pm_opp_put_opp_table(opp_table);
1615 EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
1618 * dev_pm_opp_set_prop_name() - Set prop-extn name
1619 * @dev: Device for which the prop-name has to be set.
1620 * @name: name to postfix to properties.
1622 * This is required only for the V2 bindings, and it enables a platform to
1623 * specify the extn to be used for certain property names. The properties to
1624 * which the extension will apply are opp-microvolt and opp-microamp. OPP core
1625 * should postfix the property name with -<name> while looking for them.
1627 struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
1629 struct opp_table *opp_table;
1631 opp_table = dev_pm_opp_get_opp_table(dev);
1633 return ERR_PTR(-ENOMEM);
1635 /* Make sure there are no concurrent readers while updating opp_table */
1636 WARN_ON(!list_empty(&opp_table->opp_list));
1638 /* Another CPU that shares the OPP table has set the property ? */
1639 if (opp_table->prop_name)
1642 opp_table->prop_name = kstrdup(name, GFP_KERNEL);
1643 if (!opp_table->prop_name) {
1644 dev_pm_opp_put_opp_table(opp_table);
1645 return ERR_PTR(-ENOMEM);
1650 EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
1653 * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name
1654 * @opp_table: OPP table returned by dev_pm_opp_set_prop_name().
1656 * This is required only for the V2 bindings, and is called for a matching
1657 * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
1658 * will not be freed.
1660 void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
1662 /* Make sure there are no concurrent readers while updating opp_table */
1663 WARN_ON(!list_empty(&opp_table->opp_list));
1665 kfree(opp_table->prop_name);
1666 opp_table->prop_name = NULL;
1668 dev_pm_opp_put_opp_table(opp_table);
1670 EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
1672 static int _allocate_set_opp_data(struct opp_table *opp_table)
1674 struct dev_pm_set_opp_data *data;
1675 int len, count = opp_table->regulator_count;
1677 if (WARN_ON(!opp_table->regulators))
1680 /* space for set_opp_data */
1681 len = sizeof(*data);
1683 /* space for old_opp.supplies and new_opp.supplies */
1684 len += 2 * sizeof(struct dev_pm_opp_supply) * count;
1686 data = kzalloc(len, GFP_KERNEL);
1690 data->old_opp.supplies = (void *)(data + 1);
1691 data->new_opp.supplies = data->old_opp.supplies + count;
1693 opp_table->set_opp_data = data;
1698 static void _free_set_opp_data(struct opp_table *opp_table)
1700 kfree(opp_table->set_opp_data);
1701 opp_table->set_opp_data = NULL;
1705 * dev_pm_opp_set_regulators() - Set regulator names for the device
1706 * @dev: Device for which regulator name is being set.
1707 * @names: Array of pointers to the names of the regulator.
1708 * @count: Number of regulators.
1710 * In order to support OPP switching, OPP layer needs to know the name of the
1711 * device's regulators, as the core would be required to switch voltages as
1714 * This must be called before any OPPs are initialized for the device.
1716 struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
1717 const char * const names[],
1720 struct opp_table *opp_table;
1721 struct regulator *reg;
1724 opp_table = dev_pm_opp_get_opp_table(dev);
1726 return ERR_PTR(-ENOMEM);
1728 /* This should be called before OPPs are initialized */
1729 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1734 /* Another CPU that shares the OPP table has set the regulators ? */
1735 if (opp_table->regulators)
1738 opp_table->regulators = kmalloc_array(count,
1739 sizeof(*opp_table->regulators),
1741 if (!opp_table->regulators) {
1746 for (i = 0; i < count; i++) {
1747 reg = regulator_get_optional(dev, names[i]);
1750 if (ret != -EPROBE_DEFER)
1751 dev_err(dev, "%s: no regulator (%s) found: %d\n",
1752 __func__, names[i], ret);
1753 goto free_regulators;
1756 opp_table->regulators[i] = reg;
1759 opp_table->regulator_count = count;
1761 /* Allocate block only once to pass to set_opp() routines */
1762 ret = _allocate_set_opp_data(opp_table);
1764 goto free_regulators;
1770 regulator_put(opp_table->regulators[--i]);
1772 kfree(opp_table->regulators);
1773 opp_table->regulators = NULL;
1774 opp_table->regulator_count = -1;
1776 dev_pm_opp_put_opp_table(opp_table);
1778 return ERR_PTR(ret);
1780 EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
1783 * dev_pm_opp_put_regulators() - Releases resources blocked for regulator
1784 * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
1786 void dev_pm_opp_put_regulators(struct opp_table *opp_table)
1790 if (!opp_table->regulators)
1793 /* Make sure there are no concurrent readers while updating opp_table */
1794 WARN_ON(!list_empty(&opp_table->opp_list));
1796 if (opp_table->regulator_enabled) {
1797 for (i = opp_table->regulator_count - 1; i >= 0; i--)
1798 regulator_disable(opp_table->regulators[i]);
1800 opp_table->regulator_enabled = false;
1803 for (i = opp_table->regulator_count - 1; i >= 0; i--)
1804 regulator_put(opp_table->regulators[i]);
1806 _free_set_opp_data(opp_table);
1808 kfree(opp_table->regulators);
1809 opp_table->regulators = NULL;
1810 opp_table->regulator_count = -1;
1813 dev_pm_opp_put_opp_table(opp_table);
1815 EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
1818 * dev_pm_opp_set_clkname() - Set clk name for the device
1819 * @dev: Device for which clk name is being set.
1822 * In order to support OPP switching, OPP layer needs to get pointer to the
1823 * clock for the device. Simple cases work fine without using this routine (i.e.
1824 * by passing connection-id as NULL), but for a device with multiple clocks
1825 * available, the OPP core needs to know the exact name of the clk to use.
1827 * This must be called before any OPPs are initialized for the device.
1829 struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
1831 struct opp_table *opp_table;
1834 opp_table = dev_pm_opp_get_opp_table(dev);
1836 return ERR_PTR(-ENOMEM);
1838 /* This should be called before OPPs are initialized */
1839 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1844 /* Already have default clk set, free it */
1845 if (!IS_ERR(opp_table->clk))
1846 clk_put(opp_table->clk);
1848 /* Find clk for the device */
1849 opp_table->clk = clk_get(dev, name);
1850 if (IS_ERR(opp_table->clk)) {
1851 ret = PTR_ERR(opp_table->clk);
1852 if (ret != -EPROBE_DEFER) {
1853 dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
1862 dev_pm_opp_put_opp_table(opp_table);
1864 return ERR_PTR(ret);
1866 EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
1869 * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
1870 * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
1872 void dev_pm_opp_put_clkname(struct opp_table *opp_table)
1874 /* Make sure there are no concurrent readers while updating opp_table */
1875 WARN_ON(!list_empty(&opp_table->opp_list));
1877 clk_put(opp_table->clk);
1878 opp_table->clk = ERR_PTR(-EINVAL);
1880 dev_pm_opp_put_opp_table(opp_table);
1882 EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
1885 * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
1886 * @dev: Device for which the helper is getting registered.
1887 * @set_opp: Custom set OPP helper.
1889 * This is useful to support complex platforms (like platforms with multiple
1890 * regulators per device), instead of the generic OPP set rate helper.
1892 * This must be called before any OPPs are initialized for the device.
1894 struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
1895 int (*set_opp)(struct dev_pm_set_opp_data *data))
1897 struct opp_table *opp_table;
1900 return ERR_PTR(-EINVAL);
1902 opp_table = dev_pm_opp_get_opp_table(dev);
1904 return ERR_PTR(-ENOMEM);
1906 /* This should be called before OPPs are initialized */
1907 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
1908 dev_pm_opp_put_opp_table(opp_table);
1909 return ERR_PTR(-EBUSY);
1912 /* Another CPU that shares the OPP table has set the helper ? */
1913 if (!opp_table->set_opp)
1914 opp_table->set_opp = set_opp;
1918 EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
1921 * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for
1923 * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
1925 * Release resources blocked for platform specific set_opp helper.
1927 void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
1929 /* Make sure there are no concurrent readers while updating opp_table */
1930 WARN_ON(!list_empty(&opp_table->opp_list));
1932 opp_table->set_opp = NULL;
1933 dev_pm_opp_put_opp_table(opp_table);
1935 EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
1937 static void _opp_detach_genpd(struct opp_table *opp_table)
1941 for (index = 0; index < opp_table->required_opp_count; index++) {
1942 if (!opp_table->genpd_virt_devs[index])
1945 dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
1946 opp_table->genpd_virt_devs[index] = NULL;
1949 kfree(opp_table->genpd_virt_devs);
1950 opp_table->genpd_virt_devs = NULL;
1954 * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
1955 * @dev: Consumer device for which the genpd is getting attached.
1956 * @names: Null terminated array of pointers containing names of genpd to attach.
1957 * @virt_devs: Pointer to return the array of virtual devices.
1959 * Multiple generic power domains for a device are supported with the help of
1960 * virtual genpd devices, which are created for each consumer device - genpd
1961 * pair. These are the device structures which are attached to the power domain
1962 * and are required by the OPP core to set the performance state of the genpd.
1963 * The same API also works for the case where single genpd is available and so
1964 * we don't need to support that separately.
1966 * This helper will normally be called by the consumer driver of the device
1967 * "dev", as only that has details of the genpd names.
1969 * This helper needs to be called once with a list of all genpd to attach.
1970 * Otherwise the original device structure will be used instead by the OPP core.
1972 * The order of entries in the names array must match the order in which
1973 * "required-opps" are added in DT.
1975 struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
1976 const char **names, struct device ***virt_devs)
1978 struct opp_table *opp_table;
1979 struct device *virt_dev;
1980 int index = 0, ret = -EINVAL;
1981 const char **name = names;
1983 opp_table = dev_pm_opp_get_opp_table(dev);
1985 return ERR_PTR(-ENOMEM);
1988 * If the genpd's OPP table isn't already initialized, parsing of the
1989 * required-opps fail for dev. We should retry this after genpd's OPP
1992 if (!opp_table->required_opp_count) {
1993 ret = -EPROBE_DEFER;
1997 mutex_lock(&opp_table->genpd_virt_dev_lock);
1999 opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
2000 sizeof(*opp_table->genpd_virt_devs),
2002 if (!opp_table->genpd_virt_devs)
2006 if (index >= opp_table->required_opp_count) {
2007 dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
2008 *name, opp_table->required_opp_count, index);
2012 if (opp_table->genpd_virt_devs[index]) {
2013 dev_err(dev, "Genpd virtual device already set %s\n",
2018 virt_dev = dev_pm_domain_attach_by_name(dev, *name);
2019 if (IS_ERR(virt_dev)) {
2020 ret = PTR_ERR(virt_dev);
2021 dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
2025 opp_table->genpd_virt_devs[index] = virt_dev;
2031 *virt_devs = opp_table->genpd_virt_devs;
2032 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2037 _opp_detach_genpd(opp_table);
2039 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2042 dev_pm_opp_put_opp_table(opp_table);
2044 return ERR_PTR(ret);
2046 EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd);
2049 * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device.
2050 * @opp_table: OPP table returned by dev_pm_opp_attach_genpd().
2052 * This detaches the genpd(s), resets the virtual device pointers, and puts the
2055 void dev_pm_opp_detach_genpd(struct opp_table *opp_table)
2058 * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
2061 mutex_lock(&opp_table->genpd_virt_dev_lock);
2062 _opp_detach_genpd(opp_table);
2063 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2065 dev_pm_opp_put_opp_table(opp_table);
2067 EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd);
2070 * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
2071 * @src_table: OPP table which has dst_table as one of its required OPP table.
2072 * @dst_table: Required OPP table of the src_table.
2073 * @pstate: Current performance state of the src_table.
2075 * This Returns pstate of the OPP (present in @dst_table) pointed out by the
2076 * "required-opps" property of the OPP (present in @src_table) which has
2077 * performance state set to @pstate.
2079 * Return: Zero or positive performance state on success, otherwise negative
2082 int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
2083 struct opp_table *dst_table,
2084 unsigned int pstate)
2086 struct dev_pm_opp *opp;
2087 int dest_pstate = -EINVAL;
2094 * Normally the src_table will have the "required_opps" property set to
2095 * point to one of the OPPs in the dst_table, but in some cases the
2096 * genpd and its master have one to one mapping of performance states
2097 * and so none of them have the "required-opps" property set. Return the
2098 * pstate of the src_table as it is in such cases.
2100 if (!src_table->required_opp_count)
2103 for (i = 0; i < src_table->required_opp_count; i++) {
2104 if (src_table->required_opp_tables[i]->np == dst_table->np)
2108 if (unlikely(i == src_table->required_opp_count)) {
2109 pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
2110 __func__, src_table, dst_table);
2114 mutex_lock(&src_table->lock);
2116 list_for_each_entry(opp, &src_table->opp_list, node) {
2117 if (opp->pstate == pstate) {
2118 dest_pstate = opp->required_opps[i]->pstate;
2123 pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
2127 mutex_unlock(&src_table->lock);
2133 * dev_pm_opp_add() - Add an OPP table from a table definitions
2134 * @dev: device for which we do this operation
2135 * @freq: Frequency in Hz for this OPP
2136 * @u_volt: Voltage in uVolts for this OPP
2138 * This function adds an opp definition to the opp table and returns status.
2139 * The opp is made available by default and it can be controlled using
2140 * dev_pm_opp_enable/disable functions.
2144 * Duplicate OPPs (both freq and volt are same) and opp->available
2145 * -EEXIST Freq are same and volt are different OR
2146 * Duplicate OPPs (both freq and volt are same) and !opp->available
2147 * -ENOMEM Memory allocation failure
2149 int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
2151 struct opp_table *opp_table;
2154 opp_table = dev_pm_opp_get_opp_table(dev);
2158 /* Fix regulator count for dynamic OPPs */
2159 opp_table->regulator_count = 1;
2161 ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
2163 dev_pm_opp_put_opp_table(opp_table);
2167 EXPORT_SYMBOL_GPL(dev_pm_opp_add);
2170 * _opp_set_availability() - helper to set the availability of an opp
2171 * @dev: device for which we do this operation
2172 * @freq: OPP frequency to modify availability
2173 * @availability_req: availability status requested for this opp
2175 * Set the availability of an OPP, opp_{enable,disable} share a common logic
2176 * which is isolated here.
2178 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2179 * copy operation, returns 0 if no modification was done OR modification was
2182 static int _opp_set_availability(struct device *dev, unsigned long freq,
2183 bool availability_req)
2185 struct opp_table *opp_table;
2186 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
2189 /* Find the opp_table */
2190 opp_table = _find_opp_table(dev);
2191 if (IS_ERR(opp_table)) {
2192 r = PTR_ERR(opp_table);
2193 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
2197 mutex_lock(&opp_table->lock);
2199 /* Do we have the frequency? */
2200 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
2201 if (tmp_opp->rate == freq) {
2212 /* Is update really needed? */
2213 if (opp->available == availability_req)
2216 opp->available = availability_req;
2218 dev_pm_opp_get(opp);
2219 mutex_unlock(&opp_table->lock);
2221 /* Notify the change of the OPP availability */
2222 if (availability_req)
2223 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
2226 blocking_notifier_call_chain(&opp_table->head,
2227 OPP_EVENT_DISABLE, opp);
2229 dev_pm_opp_put(opp);
2233 mutex_unlock(&opp_table->lock);
2235 dev_pm_opp_put_opp_table(opp_table);
2240 * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP
2241 * @dev: device for which we do this operation
2242 * @freq: OPP frequency to adjust voltage of
2243 * @u_volt: new OPP target voltage
2244 * @u_volt_min: new OPP min voltage
2245 * @u_volt_max: new OPP max voltage
2247 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2248 * copy operation, returns 0 if no modifcation was done OR modification was
2251 int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
2252 unsigned long u_volt, unsigned long u_volt_min,
2253 unsigned long u_volt_max)
2256 struct opp_table *opp_table;
2257 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
2260 /* Find the opp_table */
2261 opp_table = _find_opp_table(dev);
2262 if (IS_ERR(opp_table)) {
2263 r = PTR_ERR(opp_table);
2264 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
2268 mutex_lock(&opp_table->lock);
2270 /* Do we have the frequency? */
2271 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
2272 if (tmp_opp->rate == freq) {
2283 /* Is update really needed? */
2284 if (opp->supplies->u_volt == u_volt)
2287 opp->supplies->u_volt = u_volt;
2288 opp->supplies->u_volt_min = u_volt_min;
2289 opp->supplies->u_volt_max = u_volt_max;
2291 dev_pm_opp_get(opp);
2292 mutex_unlock(&opp_table->lock);
2294 /* Notify the voltage change of the OPP */
2295 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE,
2298 dev_pm_opp_put(opp);
2299 goto adjust_put_table;
2302 mutex_unlock(&opp_table->lock);
2304 dev_pm_opp_put_opp_table(opp_table);
2307 EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);
2310 * dev_pm_opp_enable() - Enable a specific OPP
2311 * @dev: device for which we do this operation
2312 * @freq: OPP frequency to enable
2314 * Enables a provided opp. If the operation is valid, this returns 0, else the
2315 * corresponding error value. It is meant to be used for users an OPP available
2316 * after being temporarily made unavailable with dev_pm_opp_disable.
2318 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2319 * copy operation, returns 0 if no modification was done OR modification was
2322 int dev_pm_opp_enable(struct device *dev, unsigned long freq)
2324 return _opp_set_availability(dev, freq, true);
2326 EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
2329 * dev_pm_opp_disable() - Disable a specific OPP
2330 * @dev: device for which we do this operation
2331 * @freq: OPP frequency to disable
2333 * Disables a provided opp. If the operation is valid, this returns
2334 * 0, else the corresponding error value. It is meant to be a temporary
2335 * control by users to make this OPP not available until the circumstances are
2336 * right to make it available again (with a call to dev_pm_opp_enable).
2338 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2339 * copy operation, returns 0 if no modification was done OR modification was
2342 int dev_pm_opp_disable(struct device *dev, unsigned long freq)
2344 return _opp_set_availability(dev, freq, false);
2346 EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
2349 * dev_pm_opp_register_notifier() - Register OPP notifier for the device
2350 * @dev: Device for which notifier needs to be registered
2351 * @nb: Notifier block to be registered
2353 * Return: 0 on success or a negative error value.
2355 int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
2357 struct opp_table *opp_table;
2360 opp_table = _find_opp_table(dev);
2361 if (IS_ERR(opp_table))
2362 return PTR_ERR(opp_table);
2364 ret = blocking_notifier_chain_register(&opp_table->head, nb);
2366 dev_pm_opp_put_opp_table(opp_table);
2370 EXPORT_SYMBOL(dev_pm_opp_register_notifier);
2373 * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
2374 * @dev: Device for which notifier needs to be unregistered
2375 * @nb: Notifier block to be unregistered
2377 * Return: 0 on success or a negative error value.
2379 int dev_pm_opp_unregister_notifier(struct device *dev,
2380 struct notifier_block *nb)
2382 struct opp_table *opp_table;
2385 opp_table = _find_opp_table(dev);
2386 if (IS_ERR(opp_table))
2387 return PTR_ERR(opp_table);
2389 ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
2391 dev_pm_opp_put_opp_table(opp_table);
2395 EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
2397 void _dev_pm_opp_find_and_remove_table(struct device *dev)
2399 struct opp_table *opp_table;
2401 /* Check for existing table for 'dev' */
2402 opp_table = _find_opp_table(dev);
2403 if (IS_ERR(opp_table)) {
2404 int error = PTR_ERR(opp_table);
2406 if (error != -ENODEV)
2407 WARN(1, "%s: opp_table: %d\n",
2408 IS_ERR_OR_NULL(dev) ?
2409 "Invalid device" : dev_name(dev),
2414 _opp_remove_all_static(opp_table);
2416 /* Drop reference taken by _find_opp_table() */
2417 dev_pm_opp_put_opp_table(opp_table);
2419 /* Drop reference taken while the OPP table was added */
2420 dev_pm_opp_put_opp_table(opp_table);
2424 * dev_pm_opp_remove_table() - Free all OPPs associated with the device
2425 * @dev: device pointer used to lookup OPP table.
2427 * Free both OPPs created using static entries present in DT and the
2428 * dynamically added entries.
2430 void dev_pm_opp_remove_table(struct device *dev)
2432 _dev_pm_opp_find_and_remove_table(dev);
2434 EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);