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Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Nishanth Menone1f60b22010-10-13 00:13:10 +02002/*
3 * Generic OPP Interface
4 *
5 * Copyright (C) 2009-2010 Texas Instruments Incorporated.
6 * Nishanth Menon
7 * Romit Dasgupta
8 * Kevin Hilman
Nishanth Menone1f60b22010-10-13 00:13:10 +02009 */
10
Viresh Kumard6d2a522015-10-17 09:45:18 +053011#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
Viresh Kumard54974c2016-02-09 10:30:38 +053013#include <linux/clk.h>
Nishanth Menone1f60b22010-10-13 00:13:10 +020014#include <linux/errno.h>
15#include <linux/err.h>
Nishanth Menone1f60b22010-10-13 00:13:10 +020016#include <linux/slab.h>
Paul Gortmaker51990e82012-01-22 11:23:42 -050017#include <linux/device.h>
Liam Girdwood80126ce2012-10-23 01:27:44 +020018#include <linux/export.h>
Viresh Kumar009acd12017-10-11 12:54:14 +053019#include <linux/pm_domain.h>
Viresh Kumar9f8ea962016-02-09 10:30:33 +053020#include <linux/regulator/consumer.h>
Nishanth Menone1f60b22010-10-13 00:13:10 +020021
Viresh Kumarf59d3ee2015-09-04 13:47:26 +053022#include "opp.h"
Nishanth Menone1f60b22010-10-13 00:13:10 +020023
24/*
Viresh Kumar2c2709d2016-02-16 14:17:53 +053025 * 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
Nishanth Menone1f60b22010-10-13 00:13:10 +020027 * various states of availability.
28 */
Viresh Kumarf47b72a2016-05-05 16:20:33 +053029LIST_HEAD(opp_tables);
Viresh Kumar7eba0c72019-11-25 13:57:58 +053030
31/* OPP tables with uninitialized required OPPs */
32LIST_HEAD(lazy_opp_tables);
33
Nishanth Menone1f60b22010-10-13 00:13:10 +020034/* Lock to allow exclusive modification to the device and opp lists */
Viresh Kumar2c2709d2016-02-16 14:17:53 +053035DEFINE_MUTEX(opp_table_lock);
Viresh Kumar27c09482020-10-27 16:53:21 +053036/* Flag indicating that opp_tables list is being updated at the moment */
37static bool opp_tables_busy;
Nishanth Menone1f60b22010-10-13 00:13:10 +020038
Viresh Kumar9e62eda2020-10-27 11:49:03 +053039static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table)
Viresh Kumar06441652015-07-29 16:23:04 +053040{
Viresh Kumar2c2709d2016-02-16 14:17:53 +053041 struct opp_device *opp_dev;
Viresh Kumar9e62eda2020-10-27 11:49:03 +053042 bool found = false;
Viresh Kumar06441652015-07-29 16:23:04 +053043
Viresh Kumar9e62eda2020-10-27 11:49:03 +053044 mutex_lock(&opp_table->lock);
Viresh Kumar2c2709d2016-02-16 14:17:53 +053045 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
Viresh Kumar9e62eda2020-10-27 11:49:03 +053046 if (opp_dev->dev == dev) {
47 found = true;
48 break;
49 }
Viresh Kumar06441652015-07-29 16:23:04 +053050
Viresh Kumar9e62eda2020-10-27 11:49:03 +053051 mutex_unlock(&opp_table->lock);
52 return found;
Viresh Kumar06441652015-07-29 16:23:04 +053053}
54
Wei Yongjun6ac42392017-02-06 14:29:55 +000055static struct opp_table *_find_opp_table_unlocked(struct device *dev)
Viresh Kumar5b650b32017-01-23 10:11:48 +053056{
57 struct opp_table *opp_table;
58
59 list_for_each_entry(opp_table, &opp_tables, node) {
Viresh Kumar9e62eda2020-10-27 11:49:03 +053060 if (_find_opp_dev(dev, opp_table)) {
Viresh Kumar5b650b32017-01-23 10:11:48 +053061 _get_opp_table_kref(opp_table);
Viresh Kumar5b650b32017-01-23 10:11:48 +053062 return opp_table;
63 }
64 }
65
66 return ERR_PTR(-ENODEV);
67}
68
Nishanth Menone1f60b22010-10-13 00:13:10 +020069/**
Viresh Kumar2c2709d2016-02-16 14:17:53 +053070 * _find_opp_table() - find opp_table struct using device pointer
71 * @dev: device pointer used to lookup OPP table
Nishanth Menone1f60b22010-10-13 00:13:10 +020072 *
Viresh Kumar052c6f12017-01-23 10:11:49 +053073 * Search OPP table for one containing matching device.
Nishanth Menone1f60b22010-10-13 00:13:10 +020074 *
Viresh Kumar2c2709d2016-02-16 14:17:53 +053075 * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
Nishanth Menone1f60b22010-10-13 00:13:10 +020076 * -EINVAL based on type of error.
77 *
Viresh Kumar5b650b32017-01-23 10:11:48 +053078 * The callers must call dev_pm_opp_put_opp_table() after the table is used.
Nishanth Menone1f60b22010-10-13 00:13:10 +020079 */
Viresh Kumar2c2709d2016-02-16 14:17:53 +053080struct opp_table *_find_opp_table(struct device *dev)
Nishanth Menone1f60b22010-10-13 00:13:10 +020081{
Viresh Kumar2c2709d2016-02-16 14:17:53 +053082 struct opp_table *opp_table;
Nishanth Menone1f60b22010-10-13 00:13:10 +020083
Viresh Kumar50a3cb02015-08-12 15:59:39 +053084 if (IS_ERR_OR_NULL(dev)) {
Nishanth Menone1f60b22010-10-13 00:13:10 +020085 pr_err("%s: Invalid parameters\n", __func__);
86 return ERR_PTR(-EINVAL);
87 }
88
Viresh Kumar5b650b32017-01-23 10:11:48 +053089 mutex_lock(&opp_table_lock);
90 opp_table = _find_opp_table_unlocked(dev);
91 mutex_unlock(&opp_table_lock);
Nishanth Menone1f60b22010-10-13 00:13:10 +020092
Viresh Kumar5b650b32017-01-23 10:11:48 +053093 return opp_table;
Nishanth Menone1f60b22010-10-13 00:13:10 +020094}
95
96/**
Linus Torvaldsbaf51c42015-11-11 09:03:01 -080097 * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
Nishanth Menone1f60b22010-10-13 00:13:10 +020098 * @opp: opp for which voltage has to be returned for
99 *
Nishanth Menon984f16c82014-12-24 11:22:57 -0600100 * Return: voltage in micro volt corresponding to the opp, else
Nishanth Menone1f60b22010-10-13 00:13:10 +0200101 * return 0
102 *
Viresh Kumardfbe4672016-12-01 16:28:19 +0530103 * This is useful only for devices with single power supply.
Nishanth Menone1f60b22010-10-13 00:13:10 +0200104 */
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500105unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
Nishanth Menone1f60b22010-10-13 00:13:10 +0200106{
Viresh Kumar052c6f12017-01-23 10:11:49 +0530107 if (IS_ERR_OR_NULL(opp)) {
Nishanth Menone1f60b22010-10-13 00:13:10 +0200108 pr_err("%s: Invalid parameters\n", __func__);
Viresh Kumar052c6f12017-01-23 10:11:49 +0530109 return 0;
110 }
Nishanth Menone1f60b22010-10-13 00:13:10 +0200111
Viresh Kumar052c6f12017-01-23 10:11:49 +0530112 return opp->supplies[0].u_volt;
Nishanth Menone1f60b22010-10-13 00:13:10 +0200113}
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500114EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200115
116/**
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500117 * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
Nishanth Menone1f60b22010-10-13 00:13:10 +0200118 * @opp: opp for which frequency has to be returned for
119 *
Nishanth Menon984f16c82014-12-24 11:22:57 -0600120 * Return: frequency in hertz corresponding to the opp, else
Nishanth Menone1f60b22010-10-13 00:13:10 +0200121 * return 0
Nishanth Menone1f60b22010-10-13 00:13:10 +0200122 */
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500123unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
Nishanth Menone1f60b22010-10-13 00:13:10 +0200124{
Andrew-sh.Cheng06a8a052020-07-20 16:55:26 +0800125 if (IS_ERR_OR_NULL(opp)) {
Nishanth Menone1f60b22010-10-13 00:13:10 +0200126 pr_err("%s: Invalid parameters\n", __func__);
Viresh Kumar052c6f12017-01-23 10:11:49 +0530127 return 0;
128 }
Nishanth Menone1f60b22010-10-13 00:13:10 +0200129
Viresh Kumar052c6f12017-01-23 10:11:49 +0530130 return opp->rate;
Nishanth Menone1f60b22010-10-13 00:13:10 +0200131}
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500132EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200133
134/**
Rajendra Nayak5b93ac52019-01-10 09:32:02 +0530135 * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
136 * @opp: opp for which level value has to be returned for
137 *
138 * Return: level read from device tree corresponding to the opp, else
139 * return 0.
140 */
141unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
142{
143 if (IS_ERR_OR_NULL(opp) || !opp->available) {
144 pr_err("%s: Invalid parameters\n", __func__);
145 return 0;
146 }
147
148 return opp->level;
149}
150EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
151
152/**
Dmitry Osipenko597ff542021-01-18 03:55:19 +0300153 * dev_pm_opp_get_required_pstate() - Gets the required performance state
154 * corresponding to an available opp
155 * @opp: opp for which performance state has to be returned for
156 * @index: index of the required opp
157 *
158 * Return: performance state read from device tree corresponding to the
159 * required opp, else return 0.
160 */
161unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
162 unsigned int index)
163{
164 if (IS_ERR_OR_NULL(opp) || !opp->available ||
165 index >= opp->opp_table->required_opp_count) {
166 pr_err("%s: Invalid parameters\n", __func__);
167 return 0;
168 }
169
Viresh Kumar7eba0c72019-11-25 13:57:58 +0530170 /* required-opps not fully initialized yet */
171 if (lazy_linking_pending(opp->opp_table))
172 return 0;
173
Dmitry Osipenko597ff542021-01-18 03:55:19 +0300174 return opp->required_opps[index]->pstate;
175}
176EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
177
178/**
Bartlomiej Zolnierkiewicz19445b22015-07-09 17:43:35 +0200179 * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
180 * @opp: opp for which turbo mode is being verified
181 *
182 * Turbo OPPs are not for normal use, and can be enabled (under certain
183 * conditions) for short duration of times to finish high throughput work
184 * quickly. Running on them for longer times may overheat the chip.
185 *
186 * Return: true if opp is turbo opp, else false.
Bartlomiej Zolnierkiewicz19445b22015-07-09 17:43:35 +0200187 */
188bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
189{
Viresh Kumar052c6f12017-01-23 10:11:49 +0530190 if (IS_ERR_OR_NULL(opp) || !opp->available) {
Bartlomiej Zolnierkiewicz19445b22015-07-09 17:43:35 +0200191 pr_err("%s: Invalid parameters\n", __func__);
192 return false;
193 }
194
Viresh Kumar052c6f12017-01-23 10:11:49 +0530195 return opp->turbo;
Bartlomiej Zolnierkiewicz19445b22015-07-09 17:43:35 +0200196}
197EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
198
199/**
Viresh Kumar3ca9bb32015-07-29 16:23:03 +0530200 * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
201 * @dev: device for which we do this operation
202 *
203 * Return: This function returns the max clock latency in nanoseconds.
Viresh Kumar3ca9bb32015-07-29 16:23:03 +0530204 */
205unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
206{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530207 struct opp_table *opp_table;
Viresh Kumar3ca9bb32015-07-29 16:23:03 +0530208 unsigned long clock_latency_ns;
209
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530210 opp_table = _find_opp_table(dev);
211 if (IS_ERR(opp_table))
Viresh Kumar5b650b32017-01-23 10:11:48 +0530212 return 0;
Viresh Kumar3ca9bb32015-07-29 16:23:03 +0530213
Viresh Kumar5b650b32017-01-23 10:11:48 +0530214 clock_latency_ns = opp_table->clock_latency_ns_max;
215
216 dev_pm_opp_put_opp_table(opp_table);
217
Viresh Kumar3ca9bb32015-07-29 16:23:03 +0530218 return clock_latency_ns;
219}
220EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
221
222/**
Viresh Kumar655c9df2016-02-09 10:30:35 +0530223 * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
224 * @dev: device for which we do this operation
225 *
226 * Return: This function returns the max voltage latency in nanoseconds.
Viresh Kumar655c9df2016-02-09 10:30:35 +0530227 */
228unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
229{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530230 struct opp_table *opp_table;
Viresh Kumar655c9df2016-02-09 10:30:35 +0530231 struct dev_pm_opp *opp;
Viresh Kumar478256b2017-05-23 09:32:11 +0530232 struct regulator *reg;
Viresh Kumar655c9df2016-02-09 10:30:35 +0530233 unsigned long latency_ns = 0;
Viresh Kumardfbe4672016-12-01 16:28:19 +0530234 int ret, i, count;
235 struct {
236 unsigned long min;
237 unsigned long max;
238 } *uV;
239
Viresh Kumarcdd3e612017-01-23 10:11:51 +0530240 opp_table = _find_opp_table(dev);
241 if (IS_ERR(opp_table))
242 return 0;
243
Viresh Kumardfbe4672016-12-01 16:28:19 +0530244 /* Regulator may not be required for the device */
Viresh Kumar90e35772018-12-11 16:32:47 +0530245 if (!opp_table->regulators)
Viresh Kumarcdd3e612017-01-23 10:11:51 +0530246 goto put_opp_table;
Viresh Kumardfbe4672016-12-01 16:28:19 +0530247
Viresh Kumar90e35772018-12-11 16:32:47 +0530248 count = opp_table->regulator_count;
249
Viresh Kumardfbe4672016-12-01 16:28:19 +0530250 uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
251 if (!uV)
Viresh Kumar478256b2017-05-23 09:32:11 +0530252 goto put_opp_table;
Viresh Kumar655c9df2016-02-09 10:30:35 +0530253
Viresh Kumar052c6f12017-01-23 10:11:49 +0530254 mutex_lock(&opp_table->lock);
255
Viresh Kumardfbe4672016-12-01 16:28:19 +0530256 for (i = 0; i < count; i++) {
257 uV[i].min = ~0;
258 uV[i].max = 0;
Viresh Kumar655c9df2016-02-09 10:30:35 +0530259
Viresh Kumar052c6f12017-01-23 10:11:49 +0530260 list_for_each_entry(opp, &opp_table->opp_list, node) {
Viresh Kumardfbe4672016-12-01 16:28:19 +0530261 if (!opp->available)
262 continue;
263
264 if (opp->supplies[i].u_volt_min < uV[i].min)
265 uV[i].min = opp->supplies[i].u_volt_min;
266 if (opp->supplies[i].u_volt_max > uV[i].max)
267 uV[i].max = opp->supplies[i].u_volt_max;
268 }
Viresh Kumar655c9df2016-02-09 10:30:35 +0530269 }
270
Viresh Kumar052c6f12017-01-23 10:11:49 +0530271 mutex_unlock(&opp_table->lock);
Viresh Kumar655c9df2016-02-09 10:30:35 +0530272
273 /*
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530274 * The caller needs to ensure that opp_table (and hence the regulator)
Viresh Kumar655c9df2016-02-09 10:30:35 +0530275 * isn't freed, while we are executing this routine.
276 */
Andrzej Hajda8cc311162017-02-20 19:57:57 +0100277 for (i = 0; i < count; i++) {
Viresh Kumar478256b2017-05-23 09:32:11 +0530278 reg = opp_table->regulators[i];
Viresh Kumardfbe4672016-12-01 16:28:19 +0530279 ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
280 if (ret > 0)
281 latency_ns += ret * 1000;
282 }
283
Viresh Kumardfbe4672016-12-01 16:28:19 +0530284 kfree(uV);
Viresh Kumarcdd3e612017-01-23 10:11:51 +0530285put_opp_table:
286 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar655c9df2016-02-09 10:30:35 +0530287
288 return latency_ns;
289}
290EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
291
292/**
Viresh Kumar21743442016-02-09 10:30:36 +0530293 * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
294 * nanoseconds
295 * @dev: device for which we do this operation
296 *
297 * Return: This function returns the max transition latency, in nanoseconds, to
298 * switch from one OPP to other.
Viresh Kumar21743442016-02-09 10:30:36 +0530299 */
300unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
301{
302 return dev_pm_opp_get_max_volt_latency(dev) +
303 dev_pm_opp_get_max_clock_latency(dev);
304}
305EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
306
307/**
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530308 * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200309 * @dev: device for which we do this operation
310 *
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530311 * Return: This function returns the frequency of the OPP marked as suspend_opp
312 * if one is available, else returns 0;
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200313 */
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530314unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200315{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530316 struct opp_table *opp_table;
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530317 unsigned long freq = 0;
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200318
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530319 opp_table = _find_opp_table(dev);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530320 if (IS_ERR(opp_table))
321 return 0;
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200322
Viresh Kumar5b650b32017-01-23 10:11:48 +0530323 if (opp_table->suspend_opp && opp_table->suspend_opp->available)
324 freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530325
Viresh Kumar5b650b32017-01-23 10:11:48 +0530326 dev_pm_opp_put_opp_table(opp_table);
327
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530328 return freq;
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200329}
Viresh Kumar3aa26a32017-01-02 14:41:02 +0530330EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200331
Viresh Kumara1e8c132018-04-06 14:35:45 +0530332int _get_opp_count(struct opp_table *opp_table)
333{
334 struct dev_pm_opp *opp;
335 int count = 0;
336
337 mutex_lock(&opp_table->lock);
338
339 list_for_each_entry(opp, &opp_table->opp_list, node) {
340 if (opp->available)
341 count++;
342 }
343
344 mutex_unlock(&opp_table->lock);
345
346 return count;
347}
348
Bartlomiej Zolnierkiewicz4eafbd12015-09-08 18:41:01 +0200349/**
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530350 * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
Nishanth Menone1f60b22010-10-13 00:13:10 +0200351 * @dev: device for which we do this operation
352 *
Nishanth Menon984f16c82014-12-24 11:22:57 -0600353 * Return: This function returns the number of available opps if there are any,
Nishanth Menone1f60b22010-10-13 00:13:10 +0200354 * else returns 0 if none or the corresponding error value.
Nishanth Menone1f60b22010-10-13 00:13:10 +0200355 */
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500356int dev_pm_opp_get_opp_count(struct device *dev)
Nishanth Menone1f60b22010-10-13 00:13:10 +0200357{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530358 struct opp_table *opp_table;
Viresh Kumara1e8c132018-04-06 14:35:45 +0530359 int count;
Nishanth Menone1f60b22010-10-13 00:13:10 +0200360
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530361 opp_table = _find_opp_table(dev);
362 if (IS_ERR(opp_table)) {
363 count = PTR_ERR(opp_table);
Fabio Estevam035ed072017-09-29 14:39:49 -0300364 dev_dbg(dev, "%s: OPP table not found (%d)\n",
Dmitry Torokhovb4718c02014-12-16 15:09:38 -0800365 __func__, count);
Viresh Kumar09f662f2018-10-03 15:22:03 +0530366 return count;
Nishanth Menone1f60b22010-10-13 00:13:10 +0200367 }
368
Viresh Kumara1e8c132018-04-06 14:35:45 +0530369 count = _get_opp_count(opp_table);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530370 dev_pm_opp_put_opp_table(opp_table);
371
Nishanth Menone1f60b22010-10-13 00:13:10 +0200372 return count;
373}
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500374EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200375
376/**
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500377 * dev_pm_opp_find_freq_exact() - search for an exact frequency
Nishanth Menone1f60b22010-10-13 00:13:10 +0200378 * @dev: device for which we do this operation
379 * @freq: frequency to search for
Nishanth Menon7ae49612011-02-25 23:46:18 +0100380 * @available: true/false - match for available opp
Nishanth Menone1f60b22010-10-13 00:13:10 +0200381 *
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530382 * Return: Searches for exact match in the opp table and returns pointer to the
Nishanth Menon984f16c82014-12-24 11:22:57 -0600383 * 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:
Nishanth Menon07797262012-10-24 22:00:12 +0200385 * EINVAL: for bad pointer
386 * ERANGE: no match found for search
387 * ENODEV: if device not found in list of registered devices
Nishanth Menone1f60b22010-10-13 00:13:10 +0200388 *
389 * Note: available is a modifier for the search. if available=true, then the
390 * match is for exact matching frequency and is available in the stored OPP
391 * table. if false, the match is for exact frequency which is not available.
392 *
393 * This provides a mechanism to enable an opp which is not available currently
394 * or the opposite as well.
395 *
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530396 * The callers are required to call dev_pm_opp_put() for the returned OPP after
397 * use.
Nishanth Menone1f60b22010-10-13 00:13:10 +0200398 */
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500399struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
400 unsigned long freq,
401 bool available)
Nishanth Menone1f60b22010-10-13 00:13:10 +0200402{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530403 struct opp_table *opp_table;
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500404 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200405
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530406 opp_table = _find_opp_table(dev);
407 if (IS_ERR(opp_table)) {
408 int r = PTR_ERR(opp_table);
409
410 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200411 return ERR_PTR(r);
412 }
413
Viresh Kumar052c6f12017-01-23 10:11:49 +0530414 mutex_lock(&opp_table->lock);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530415
Viresh Kumar052c6f12017-01-23 10:11:49 +0530416 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
Nishanth Menone1f60b22010-10-13 00:13:10 +0200417 if (temp_opp->available == available &&
418 temp_opp->rate == freq) {
419 opp = temp_opp;
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530420
421 /* Increment the reference count of OPP */
422 dev_pm_opp_get(opp);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200423 break;
424 }
425 }
426
Viresh Kumar052c6f12017-01-23 10:11:49 +0530427 mutex_unlock(&opp_table->lock);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530428 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530429
Nishanth Menone1f60b22010-10-13 00:13:10 +0200430 return opp;
431}
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500432EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200433
Niklas Cassel71419d82019-07-25 12:41:29 +0200434/**
435 * dev_pm_opp_find_level_exact() - search for an exact level
436 * @dev: device for which we do this operation
437 * @level: level to search for
438 *
439 * Return: Searches for exact match in the opp table and returns pointer to the
440 * matching opp if found, else returns ERR_PTR in case of error and should
441 * be handled using IS_ERR. Error return values can be:
442 * EINVAL: for bad pointer
443 * ERANGE: no match found for search
444 * ENODEV: if device not found in list of registered devices
445 *
446 * The callers are required to call dev_pm_opp_put() for the returned OPP after
447 * use.
448 */
449struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
450 unsigned int level)
451{
452 struct opp_table *opp_table;
453 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
454
455 opp_table = _find_opp_table(dev);
456 if (IS_ERR(opp_table)) {
457 int r = PTR_ERR(opp_table);
458
459 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
460 return ERR_PTR(r);
461 }
462
463 mutex_lock(&opp_table->lock);
464
465 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
466 if (temp_opp->level == level) {
467 opp = temp_opp;
468
469 /* Increment the reference count of OPP */
470 dev_pm_opp_get(opp);
471 break;
472 }
473 }
474
475 mutex_unlock(&opp_table->lock);
476 dev_pm_opp_put_opp_table(opp_table);
477
478 return opp;
479}
480EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
481
Dmitry Osipenko8dd5cad2021-01-18 03:55:18 +0300482/**
483 * dev_pm_opp_find_level_ceil() - search for an rounded up level
484 * @dev: device for which we do this operation
485 * @level: level to search for
486 *
487 * Return: Searches for rounded up match in the opp table and returns pointer
488 * to the matching opp if found, else returns ERR_PTR in case of error and
489 * should be handled using IS_ERR. Error return values can be:
490 * EINVAL: for bad pointer
491 * ERANGE: no match found for search
492 * ENODEV: if device not found in list of registered devices
493 *
494 * The callers are required to call dev_pm_opp_put() for the returned OPP after
495 * use.
496 */
497struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
498 unsigned int *level)
499{
500 struct opp_table *opp_table;
501 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
502
503 opp_table = _find_opp_table(dev);
504 if (IS_ERR(opp_table)) {
505 int r = PTR_ERR(opp_table);
506
507 dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
508 return ERR_PTR(r);
509 }
510
511 mutex_lock(&opp_table->lock);
512
513 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
514 if (temp_opp->available && temp_opp->level >= *level) {
515 opp = temp_opp;
516 *level = opp->level;
517
518 /* Increment the reference count of OPP */
519 dev_pm_opp_get(opp);
520 break;
521 }
522 }
523
524 mutex_unlock(&opp_table->lock);
525 dev_pm_opp_put_opp_table(opp_table);
526
527 return opp;
528}
529EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
530
Jisheng Zhang067b7ce2016-07-25 14:11:16 +0800531static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
532 unsigned long *freq)
533{
534 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
535
Viresh Kumar052c6f12017-01-23 10:11:49 +0530536 mutex_lock(&opp_table->lock);
537
538 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
Jisheng Zhang067b7ce2016-07-25 14:11:16 +0800539 if (temp_opp->available && temp_opp->rate >= *freq) {
540 opp = temp_opp;
541 *freq = opp->rate;
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530542
543 /* Increment the reference count of OPP */
544 dev_pm_opp_get(opp);
Jisheng Zhang067b7ce2016-07-25 14:11:16 +0800545 break;
546 }
547 }
548
Viresh Kumar052c6f12017-01-23 10:11:49 +0530549 mutex_unlock(&opp_table->lock);
550
Jisheng Zhang067b7ce2016-07-25 14:11:16 +0800551 return opp;
552}
553
Nishanth Menone1f60b22010-10-13 00:13:10 +0200554/**
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500555 * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
Nishanth Menone1f60b22010-10-13 00:13:10 +0200556 * @dev: device for which we do this operation
557 * @freq: Start frequency
558 *
559 * Search for the matching ceil *available* OPP from a starting freq
560 * for a device.
561 *
Nishanth Menon984f16c82014-12-24 11:22:57 -0600562 * Return: matching *opp and refreshes *freq accordingly, else returns
Nishanth Menon07797262012-10-24 22:00:12 +0200563 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
564 * values can be:
565 * EINVAL: for bad pointer
566 * ERANGE: no match found for search
567 * ENODEV: if device not found in list of registered devices
Nishanth Menone1f60b22010-10-13 00:13:10 +0200568 *
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530569 * The callers are required to call dev_pm_opp_put() for the returned OPP after
570 * use.
Nishanth Menone1f60b22010-10-13 00:13:10 +0200571 */
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500572struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
573 unsigned long *freq)
Nishanth Menone1f60b22010-10-13 00:13:10 +0200574{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530575 struct opp_table *opp_table;
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530576 struct dev_pm_opp *opp;
Dmitry Torokhovb02ded22014-12-16 15:09:36 -0800577
Nishanth Menone1f60b22010-10-13 00:13:10 +0200578 if (!dev || !freq) {
579 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
580 return ERR_PTR(-EINVAL);
581 }
582
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530583 opp_table = _find_opp_table(dev);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530584 if (IS_ERR(opp_table))
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530585 return ERR_CAST(opp_table);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530586
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530587 opp = _find_freq_ceil(opp_table, freq);
588
Viresh Kumar5b650b32017-01-23 10:11:48 +0530589 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530590
591 return opp;
Nishanth Menone1f60b22010-10-13 00:13:10 +0200592}
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500593EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200594
595/**
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500596 * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
Nishanth Menone1f60b22010-10-13 00:13:10 +0200597 * @dev: device for which we do this operation
598 * @freq: Start frequency
599 *
600 * Search for the matching floor *available* OPP from a starting freq
601 * for a device.
602 *
Nishanth Menon984f16c82014-12-24 11:22:57 -0600603 * Return: matching *opp and refreshes *freq accordingly, else returns
Nishanth Menon07797262012-10-24 22:00:12 +0200604 * ERR_PTR in case of error and should be handled using IS_ERR. Error return
605 * values can be:
606 * EINVAL: for bad pointer
607 * ERANGE: no match found for search
608 * ENODEV: if device not found in list of registered devices
Nishanth Menone1f60b22010-10-13 00:13:10 +0200609 *
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530610 * The callers are required to call dev_pm_opp_put() for the returned OPP after
611 * use.
Nishanth Menone1f60b22010-10-13 00:13:10 +0200612 */
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500613struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
614 unsigned long *freq)
Nishanth Menone1f60b22010-10-13 00:13:10 +0200615{
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530616 struct opp_table *opp_table;
Nishanth Menon47d43ba2013-09-19 16:03:51 -0500617 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200618
619 if (!dev || !freq) {
620 dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
621 return ERR_PTR(-EINVAL);
622 }
623
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530624 opp_table = _find_opp_table(dev);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530625 if (IS_ERR(opp_table))
Viresh Kumar2c2709d2016-02-16 14:17:53 +0530626 return ERR_CAST(opp_table);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530627
Viresh Kumar052c6f12017-01-23 10:11:49 +0530628 mutex_lock(&opp_table->lock);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200629
Viresh Kumar052c6f12017-01-23 10:11:49 +0530630 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
Nishanth Menone1f60b22010-10-13 00:13:10 +0200631 if (temp_opp->available) {
632 /* go to the next node, before choosing prev */
633 if (temp_opp->rate > *freq)
634 break;
635 else
636 opp = temp_opp;
637 }
638 }
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530639
640 /* Increment the reference count of OPP */
641 if (!IS_ERR(opp))
642 dev_pm_opp_get(opp);
Viresh Kumar052c6f12017-01-23 10:11:49 +0530643 mutex_unlock(&opp_table->lock);
Viresh Kumar5b650b32017-01-23 10:11:48 +0530644 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar8a31d9d92017-01-23 10:11:47 +0530645
Nishanth Menone1f60b22010-10-13 00:13:10 +0200646 if (!IS_ERR(opp))
647 *freq = opp->rate;
648
649 return opp;
650}
Nishanth Menon5d4879c2013-09-19 16:03:50 -0500651EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
Nishanth Menone1f60b22010-10-13 00:13:10 +0200652
Andrew-sh.Cheng2f36bde2019-03-29 14:46:10 +0800653/**
654 * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
655 * target voltage.
656 * @dev: Device for which we do this operation.
657 * @u_volt: Target voltage.
658 *
659 * Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
660 *
661 * Return: matching *opp, else returns ERR_PTR in case of error which should be
662 * handled using IS_ERR.
663 *
664 * Error return values can be:
665 * EINVAL: bad parameters
666 *
667 * The callers are required to call dev_pm_opp_put() for the returned OPP after
668 * use.
669 */
670struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
671 unsigned long u_volt)
672{
673 struct opp_table *opp_table;
674 struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
675
676 if (!dev || !u_volt) {
677 dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__,
678 u_volt);
679 return ERR_PTR(-EINVAL);
680 }
681
682 opp_table = _find_opp_table(dev);
683 if (IS_ERR(opp_table))
684 return ERR_CAST(opp_table);
685
686 mutex_lock(&opp_table->lock);
687
688 list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
689 if (temp_opp->available) {
690 if (temp_opp->supplies[0].u_volt > u_volt)
691 break;
692 opp = temp_opp;
693 }
694 }
695
696 /* Increment the reference count of OPP */
697 if (!IS_ERR(opp))
698 dev_pm_opp_get(opp);
699
700 mutex_unlock(&opp_table->lock);
701 dev_pm_opp_put_opp_table(opp_table);
702
703 return opp;
704}
705EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);
706
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530707static int _set_opp_voltage(struct device *dev, struct regulator *reg,
Viresh Kumarce317812016-12-01 16:28:18 +0530708 struct dev_pm_opp_supply *supply)
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530709{
710 int ret;
711
712 /* Regulator not available for device */
713 if (IS_ERR(reg)) {
714 dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
715 PTR_ERR(reg));
716 return 0;
717 }
718
Viresh Kumarce317812016-12-01 16:28:18 +0530719 dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
720 supply->u_volt_min, supply->u_volt, supply->u_volt_max);
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530721
Viresh Kumarce317812016-12-01 16:28:18 +0530722 ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
723 supply->u_volt, supply->u_volt_max);
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530724 if (ret)
725 dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
Viresh Kumarce317812016-12-01 16:28:18 +0530726 __func__, supply->u_volt_min, supply->u_volt,
727 supply->u_volt_max, ret);
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530728
729 return ret;
730}
731
Viresh Kumar285881b2019-01-31 13:53:25 +0530732static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
733 unsigned long freq)
Viresh Kumar94735582016-12-01 16:28:20 +0530734{
735 int ret;
736
Viresh Kumar35e74b22021-01-21 12:38:13 +0530737 /* We may reach here for devices which don't change frequency */
738 if (IS_ERR(clk))
739 return 0;
740
Viresh Kumar94735582016-12-01 16:28:20 +0530741 ret = clk_set_rate(clk, freq);
742 if (ret) {
743 dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
744 ret);
745 }
746
747 return ret;
748}
749
Kamil Konieczny8d457192019-07-19 17:05:32 +0200750static int _generic_set_opp_regulator(struct opp_table *opp_table,
Viresh Kumarc74b32f2017-05-23 09:32:10 +0530751 struct device *dev,
Viresh Kumar3f626702021-01-21 12:38:13 +0530752 struct dev_pm_opp *opp,
Viresh Kumarc74b32f2017-05-23 09:32:10 +0530753 unsigned long freq,
Viresh Kumar3f626702021-01-21 12:38:13 +0530754 int scaling_down)
Viresh Kumar94735582016-12-01 16:28:20 +0530755{
Viresh Kumarc74b32f2017-05-23 09:32:10 +0530756 struct regulator *reg = opp_table->regulators[0];
Viresh Kumar3f626702021-01-21 12:38:13 +0530757 struct dev_pm_opp *old_opp = opp_table->current_opp;
Viresh Kumar94735582016-12-01 16:28:20 +0530758 int ret;
759
760 /* This function only supports single regulator per device */
Viresh Kumarc74b32f2017-05-23 09:32:10 +0530761 if (WARN_ON(opp_table->regulator_count > 1)) {
Viresh Kumar94735582016-12-01 16:28:20 +0530762 dev_err(dev, "multiple regulators are not supported\n");
763 return -EINVAL;
764 }
765
766 /* Scaling up? Scale voltage before frequency */
Viresh Kumar3f626702021-01-21 12:38:13 +0530767 if (!scaling_down) {
768 ret = _set_opp_voltage(dev, reg, opp->supplies);
Viresh Kumar94735582016-12-01 16:28:20 +0530769 if (ret)
770 goto restore_voltage;
771 }
772
773 /* Change frequency */
Viresh Kumar285881b2019-01-31 13:53:25 +0530774 ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
Viresh Kumar94735582016-12-01 16:28:20 +0530775 if (ret)
776 goto restore_voltage;
777
778 /* Scaling down? Scale voltage after frequency */
Viresh Kumar3f626702021-01-21 12:38:13 +0530779 if (scaling_down) {
780 ret = _set_opp_voltage(dev, reg, opp->supplies);
Viresh Kumar94735582016-12-01 16:28:20 +0530781 if (ret)
782 goto restore_freq;
783 }
784
Kamil Konieczny8d457192019-07-19 17:05:32 +0200785 /*
786 * Enable the regulator after setting its voltages, otherwise it breaks
787 * some boot-enabled regulators.
788 */
Viresh Kumar72f80ce2020-08-13 08:38:37 +0530789 if (unlikely(!opp_table->enabled)) {
Kamil Konieczny8d457192019-07-19 17:05:32 +0200790 ret = regulator_enable(reg);
791 if (ret < 0)
792 dev_warn(dev, "Failed to enable regulator: %d", ret);
Kamil Konieczny8d457192019-07-19 17:05:32 +0200793 }
794
Viresh Kumar94735582016-12-01 16:28:20 +0530795 return 0;
796
797restore_freq:
Viresh Kumar3f626702021-01-21 12:38:13 +0530798 if (_generic_set_opp_clk_only(dev, opp_table->clk, old_opp->rate))
Viresh Kumar94735582016-12-01 16:28:20 +0530799 dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
Viresh Kumar3f626702021-01-21 12:38:13 +0530800 __func__, old_opp->rate);
Viresh Kumar94735582016-12-01 16:28:20 +0530801restore_voltage:
802 /* This shouldn't harm even if the voltages weren't updated earlier */
Viresh Kumar3f626702021-01-21 12:38:13 +0530803 _set_opp_voltage(dev, reg, old_opp->supplies);
Viresh Kumar94735582016-12-01 16:28:20 +0530804
805 return ret;
806}
807
Viresh Kumarb00e6672020-05-27 09:33:44 +0530808static int _set_opp_bw(const struct opp_table *opp_table,
Viresh Kumar240ae502021-01-21 15:27:55 +0530809 struct dev_pm_opp *opp, struct device *dev)
Viresh Kumarb00e6672020-05-27 09:33:44 +0530810{
811 u32 avg, peak;
812 int i, ret;
813
814 if (!opp_table->paths)
815 return 0;
816
817 for (i = 0; i < opp_table->path_count; i++) {
Viresh Kumar240ae502021-01-21 15:27:55 +0530818 if (!opp) {
Viresh Kumarb00e6672020-05-27 09:33:44 +0530819 avg = 0;
820 peak = 0;
821 } else {
822 avg = opp->bandwidth[i].avg;
823 peak = opp->bandwidth[i].peak;
824 }
825 ret = icc_set_bw(opp_table->paths[i], avg, peak);
826 if (ret) {
827 dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
Viresh Kumar240ae502021-01-21 15:27:55 +0530828 opp ? "set" : "remove", i, ret);
Viresh Kumarb00e6672020-05-27 09:33:44 +0530829 return ret;
830 }
831 }
832
833 return 0;
834}
835
Viresh Kumar7e5359932018-06-12 14:47:03 +0530836static int _set_opp_custom(const struct opp_table *opp_table,
Viresh Kumar509e4772021-01-21 13:06:01 +0530837 struct device *dev, struct dev_pm_opp *opp,
838 unsigned long freq)
Viresh Kumar7e5359932018-06-12 14:47:03 +0530839{
Dmitry Osipenko04b447d2021-01-21 01:26:49 +0300840 struct dev_pm_set_opp_data *data = opp_table->set_opp_data;
Viresh Kumar509e4772021-01-21 13:06:01 +0530841 struct dev_pm_opp *old_opp = opp_table->current_opp;
Viresh Kumar7e5359932018-06-12 14:47:03 +0530842 int size;
843
Dmitry Osipenko04b447d2021-01-21 01:26:49 +0300844 /*
845 * We support this only if dev_pm_opp_set_regulators() was called
846 * earlier.
847 */
848 if (opp_table->sod_supplies) {
Viresh Kumar509e4772021-01-21 13:06:01 +0530849 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);
Dmitry Osipenko04b447d2021-01-21 01:26:49 +0300852 data->regulator_count = opp_table->regulator_count;
853 } else {
854 data->regulator_count = 0;
855 }
856
Viresh Kumar7e5359932018-06-12 14:47:03 +0530857 data->regulators = opp_table->regulators;
Viresh Kumar7e5359932018-06-12 14:47:03 +0530858 data->clk = opp_table->clk;
859 data->dev = dev;
Viresh Kumar509e4772021-01-21 13:06:01 +0530860 data->old_opp.rate = old_opp->rate;
Viresh Kumar7e5359932018-06-12 14:47:03 +0530861 data->new_opp.rate = freq;
Viresh Kumar7e5359932018-06-12 14:47:03 +0530862
863 return opp_table->set_opp(data);
864}
865
Stephan Gerhold60cdeae2020-07-30 10:01:44 +0200866static int _set_required_opp(struct device *dev, struct device *pd_dev,
867 struct dev_pm_opp *opp, int i)
868{
869 unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
870 int ret;
871
872 if (!pd_dev)
873 return 0;
874
875 ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
876 if (ret) {
877 dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
878 dev_name(pd_dev), pstate, ret);
879 }
880
881 return ret;
882}
883
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530884/* This is only called for PM domain for now */
885static int _set_required_opps(struct device *dev,
886 struct opp_table *opp_table,
Stephan Gerhold2c591382020-07-30 10:01:45 +0200887 struct dev_pm_opp *opp, bool up)
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530888{
889 struct opp_table **required_opp_tables = opp_table->required_opp_tables;
890 struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530891 int i, ret = 0;
892
893 if (!required_opp_tables)
894 return 0;
895
Viresh Kumar7eba0c72019-11-25 13:57:58 +0530896 /* required-opps not fully initialized yet */
897 if (lazy_linking_pending(opp_table))
898 return -EBUSY;
899
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530900 /* Single genpd case */
Stephan Gerhold60cdeae2020-07-30 10:01:44 +0200901 if (!genpd_virt_devs)
902 return _set_required_opp(dev, dev, opp, 0);
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530903
904 /* Multiple genpd case */
905
906 /*
907 * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
908 * after it is freed from another thread.
909 */
910 mutex_lock(&opp_table->genpd_virt_dev_lock);
911
Stephan Gerhold2c591382020-07-30 10:01:45 +0200912 /* Scaling up? Set required OPPs in normal order, else reverse */
913 if (up) {
914 for (i = 0; i < opp_table->required_opp_count; i++) {
915 ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
916 if (ret)
917 break;
918 }
919 } else {
920 for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
921 ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
922 if (ret)
923 break;
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530924 }
925 }
Stephan Gerhold2c591382020-07-30 10:01:45 +0200926
Viresh Kumarca1b5d72018-06-14 10:03:26 +0530927 mutex_unlock(&opp_table->genpd_virt_dev_lock);
928
929 return ret;
930}
931
Viresh Kumar81c4d8a2021-01-20 16:16:48 +0530932static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
933{
934 struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
935 unsigned long freq;
936
937 if (!IS_ERR(opp_table->clk)) {
938 freq = clk_get_rate(opp_table->clk);
939 opp = _find_freq_ceil(opp_table, &freq);
940 }
941
942 /*
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.
946 */
947 if (IS_ERR(opp)) {
948 mutex_lock(&opp_table->lock);
949 opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node);
950 dev_pm_opp_get(opp);
951 mutex_unlock(&opp_table->lock);
952 }
953
954 opp_table->current_opp = opp;
955}
956
Viresh Kumar5ad58bb2021-01-21 12:08:45 +0530957static int _disable_opp_table(struct device *dev, struct opp_table *opp_table)
Viresh Kumarf3364e12020-08-13 09:48:04 +0530958{
959 int ret;
960
961 if (!opp_table->enabled)
962 return 0;
963
964 /*
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().
968 */
969 if (!_get_opp_count(opp_table))
970 return 0;
971
Viresh Kumar240ae502021-01-21 15:27:55 +0530972 ret = _set_opp_bw(opp_table, NULL, dev);
Viresh Kumarf3364e12020-08-13 09:48:04 +0530973 if (ret)
974 return ret;
975
976 if (opp_table->regulators)
977 regulator_disable(opp_table->regulators[0]);
978
Stephan Gerhold2c591382020-07-30 10:01:45 +0200979 ret = _set_required_opps(dev, opp_table, NULL, false);
Viresh Kumarf3364e12020-08-13 09:48:04 +0530980
981 opp_table->enabled = false;
982 return ret;
983}
984
Viresh Kumar386ba852021-01-21 12:12:09 +0530985static int _set_opp(struct device *dev, struct opp_table *opp_table,
986 struct dev_pm_opp *opp, unsigned long freq)
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530987{
Viresh Kumar386ba852021-01-21 12:12:09 +0530988 struct dev_pm_opp *old_opp;
Viresh Kumarf0b88fa42021-01-21 16:00:12 +0530989 int scaling_down, ret;
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530990
Viresh Kumar386ba852021-01-21 12:12:09 +0530991 if (unlikely(!opp))
992 return _disable_opp_table(dev, opp_table);
Rajendra Nayakaca48b62020-04-08 19:16:27 +0530993
Viresh Kumar81c4d8a2021-01-20 16:16:48 +0530994 /* 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);
Viresh Kumar6a0712f2016-02-09 10:30:39 +0530997
Viresh Kumar81c4d8a2021-01-20 16:16:48 +0530998 old_opp = opp_table->current_opp;
Viresh Kumar81c4d8a2021-01-20 16:16:48 +0530999
1000 /* Return early if nothing to do */
Jonathan Marekde042412021-02-16 15:10:29 -05001001 if (old_opp == opp && opp_table->current_rate == freq &&
1002 opp_table->enabled) {
Viresh Kumar81c4d8a2021-01-20 16:16:48 +05301003 dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__);
Viresh Kumar386ba852021-01-21 12:12:09 +05301004 return 0;
Viresh Kumar6a0712f2016-02-09 10:30:39 +05301005 }
1006
Viresh Kumarf0b88fa42021-01-21 16:00:12 +05301007 dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n",
Jonathan Marekde042412021-02-16 15:10:29 -05001008 __func__, opp_table->current_rate, freq, old_opp->level,
1009 opp->level, old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
Viresh Kumarf0b88fa42021-01-21 16:00:12 +05301010 opp->bandwidth ? opp->bandwidth[0].peak : 0);
1011
1012 scaling_down = _opp_compare_key(old_opp, opp);
1013 if (scaling_down == -1)
1014 scaling_down = 0;
Viresh Kumardfbe4672016-12-01 16:28:19 +05301015
Viresh Kumarca1b5d72018-06-14 10:03:26 +05301016 /* Scaling up? Configure required OPPs before frequency */
Viresh Kumarf0b88fa42021-01-21 16:00:12 +05301017 if (!scaling_down) {
Stephan Gerhold2c591382020-07-30 10:01:45 +02001018 ret = _set_required_opps(dev, opp_table, opp, true);
Viresh Kumar870d5d92021-01-28 15:30:00 +05301019 if (ret) {
1020 dev_err(dev, "Failed to set required opps: %d\n", ret);
Viresh Kumar386ba852021-01-21 12:12:09 +05301021 return ret;
Viresh Kumar870d5d92021-01-28 15:30:00 +05301022 }
1023
1024 ret = _set_opp_bw(opp_table, opp, dev);
1025 if (ret) {
1026 dev_err(dev, "Failed to set bw: %d\n", ret);
1027 return ret;
1028 }
Viresh Kumarca1b5d72018-06-14 10:03:26 +05301029 }
1030
Viresh Kumar7e5359932018-06-12 14:47:03 +05301031 if (opp_table->set_opp) {
Viresh Kumar509e4772021-01-21 13:06:01 +05301032 ret = _set_opp_custom(opp_table, dev, opp, freq);
Viresh Kumar7e5359932018-06-12 14:47:03 +05301033 } else if (opp_table->regulators) {
Viresh Kumar3f626702021-01-21 12:38:13 +05301034 ret = _generic_set_opp_regulator(opp_table, dev, opp, freq,
1035 scaling_down);
Viresh Kumarc74b32f2017-05-23 09:32:10 +05301036 } else {
Viresh Kumar7e5359932018-06-12 14:47:03 +05301037 /* Only frequency scaling */
Viresh Kumar1d3c42c2021-01-20 15:57:21 +05301038 ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
Viresh Kumardfbe4672016-12-01 16:28:19 +05301039 }
1040
Viresh Kumar870d5d92021-01-28 15:30:00 +05301041 if (ret)
1042 return ret;
1043
Viresh Kumarca1b5d72018-06-14 10:03:26 +05301044 /* Scaling down? Configure required OPPs after frequency */
Viresh Kumar870d5d92021-01-28 15:30:00 +05301045 if (scaling_down) {
Viresh Kumar240ae502021-01-21 15:27:55 +05301046 ret = _set_opp_bw(opp_table, opp, dev);
Viresh Kumar870d5d92021-01-28 15:30:00 +05301047 if (ret) {
1048 dev_err(dev, "Failed to set bw: %d\n", ret);
1049 return ret;
1050 }
Viresh Kumar81c4d8a2021-01-20 16:16:48 +05301051
Viresh Kumar870d5d92021-01-28 15:30:00 +05301052 ret = _set_required_opps(dev, opp_table, opp, false);
1053 if (ret) {
1054 dev_err(dev, "Failed to set required opps: %d\n", ret);
1055 return ret;
Viresh Kumar81c4d8a2021-01-20 16:16:48 +05301056 }
Viresh Kumar72f80ce2020-08-13 08:38:37 +05301057 }
Georgi Djakovfe2af402020-05-12 15:53:23 +03001058
Viresh Kumar870d5d92021-01-28 15:30:00 +05301059 opp_table->enabled = true;
1060 dev_pm_opp_put(old_opp);
1061
1062 /* Make sure current_opp doesn't get freed */
1063 dev_pm_opp_get(opp);
1064 opp_table->current_opp = opp;
Jonathan Marekde042412021-02-16 15:10:29 -05001065 opp_table->current_rate = freq;
Viresh Kumar870d5d92021-01-28 15:30:00 +05301066
Viresh Kumar386ba852021-01-21 12:12:09 +05301067 return ret;
1068}
1069
1070/**
1071 * dev_pm_opp_set_rate() - Configure new OPP based on frequency
1072 * @dev: device for which we do this operation
1073 * @target_freq: frequency to achieve
1074 *
1075 * This configures the power-supplies to the levels specified by the OPP
1076 * corresponding to the target_freq, and programs the clock to a value <=
1077 * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax
1078 * provided by the opp, should have already rounded to the target OPP's
1079 * frequency.
1080 */
1081int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
1082{
1083 struct opp_table *opp_table;
1084 unsigned long freq = 0, temp_freq;
1085 struct dev_pm_opp *opp = NULL;
1086 int ret;
1087
1088 opp_table = _find_opp_table(dev);
1089 if (IS_ERR(opp_table)) {
1090 dev_err(dev, "%s: device's opp table doesn't exist\n", __func__);
1091 return PTR_ERR(opp_table);
1092 }
1093
1094 if (target_freq) {
1095 /*
1096 * For IO devices which require an OPP on some platforms/SoCs
1097 * while just needing to scale the clock on some others
1098 * we look for empty OPP tables with just a clock handle and
1099 * scale only the clk. This makes dev_pm_opp_set_rate()
1100 * equivalent to a clk_set_rate()
1101 */
1102 if (!_get_opp_count(opp_table)) {
1103 ret = _generic_set_opp_clk_only(dev, opp_table->clk, target_freq);
1104 goto put_opp_table;
1105 }
1106
1107 freq = clk_round_rate(opp_table->clk, target_freq);
1108 if ((long)freq <= 0)
1109 freq = target_freq;
1110
1111 /*
1112 * The clock driver may support finer resolution of the
1113 * frequencies than the OPP table, don't update the frequency we
1114 * pass to clk_set_rate() here.
1115 */
1116 temp_freq = freq;
1117 opp = _find_freq_ceil(opp_table, &temp_freq);
1118 if (IS_ERR(opp)) {
1119 ret = PTR_ERR(opp);
1120 dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
1121 __func__, freq, ret);
1122 goto put_opp_table;
1123 }
1124 }
1125
1126 ret = _set_opp(dev, opp_table, opp, freq);
1127
1128 if (target_freq)
1129 dev_pm_opp_put(opp);
Viresh Kumar052c6f12017-01-23 10:11:49 +05301130put_opp_table:
Viresh Kumar5b650b32017-01-23 10:11:48 +05301131 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar052c6f12017-01-23 10:11:49 +05301132 return ret;
Viresh Kumar6a0712f2016-02-09 10:30:39 +05301133}
1134EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
1135
Viresh Kumarabbe3482021-01-21 12:15:36 +05301136/**
1137 * dev_pm_opp_set_opp() - Configure device for OPP
1138 * @dev: device for which we do this operation
1139 * @opp: OPP to set to
1140 *
1141 * This configures the device based on the properties of the OPP passed to this
1142 * routine.
1143 *
1144 * Return: 0 on success, a negative error number otherwise.
1145 */
1146int dev_pm_opp_set_opp(struct device *dev, struct dev_pm_opp *opp)
1147{
1148 struct opp_table *opp_table;
1149 int ret;
1150
1151 opp_table = _find_opp_table(dev);
1152 if (IS_ERR(opp_table)) {
1153 dev_err(dev, "%s: device opp doesn't exist\n", __func__);
1154 return PTR_ERR(opp_table);
1155 }
1156
1157 ret = _set_opp(dev, opp_table, opp, opp ? opp->rate : 0);
1158 dev_pm_opp_put_opp_table(opp_table);
1159
1160 return ret;
1161}
1162EXPORT_SYMBOL_GPL(dev_pm_opp_set_opp);
1163
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301164/* OPP-dev Helpers */
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301165static void _remove_opp_dev(struct opp_device *opp_dev,
1166 struct opp_table *opp_table)
Viresh Kumar06441652015-07-29 16:23:04 +05301167{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301168 opp_debug_unregister(opp_dev, opp_table);
1169 list_del(&opp_dev->node);
Viresh Kumar052c6f12017-01-23 10:11:49 +05301170 kfree(opp_dev);
Viresh Kumar06441652015-07-29 16:23:04 +05301171}
1172
Viresh Kumaref43f012020-10-22 12:12:27 +05301173struct opp_device *_add_opp_dev(const struct device *dev,
1174 struct opp_table *opp_table)
Viresh Kumar06441652015-07-29 16:23:04 +05301175{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301176 struct opp_device *opp_dev;
Viresh Kumar06441652015-07-29 16:23:04 +05301177
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301178 opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
1179 if (!opp_dev)
Viresh Kumar06441652015-07-29 16:23:04 +05301180 return NULL;
1181
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301182 /* Initialize opp-dev */
1183 opp_dev->dev = dev;
Viresh Kumar3d255692018-08-03 07:05:21 +05301184
Viresh Kumaref43f012020-10-22 12:12:27 +05301185 mutex_lock(&opp_table->lock);
Viresh Kumar052c6f12017-01-23 10:11:49 +05301186 list_add(&opp_dev->node, &opp_table->dev_list);
Viresh Kumaref43f012020-10-22 12:12:27 +05301187 mutex_unlock(&opp_table->lock);
Viresh Kumar06441652015-07-29 16:23:04 +05301188
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301189 /* Create debugfs entries for the opp_table */
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +01001190 opp_debug_register(opp_dev, opp_table);
Viresh Kumar283d55e2018-09-07 09:01:54 +05301191
1192 return opp_dev;
1193}
1194
Viresh Kumareb7c87432018-09-05 16:17:14 +05301195static struct opp_table *_allocate_opp_table(struct device *dev, int index)
Viresh Kumar07cce742014-12-10 09:45:34 +05301196{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301197 struct opp_table *opp_table;
1198 struct opp_device *opp_dev;
Viresh Kumard54974c2016-02-09 10:30:38 +05301199 int ret;
Viresh Kumar07cce742014-12-10 09:45:34 +05301200
1201 /*
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301202 * Allocate a new OPP table. In the infrequent case where a new
Viresh Kumar07cce742014-12-10 09:45:34 +05301203 * device is needed to be added, we pay this penalty.
1204 */
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301205 opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
1206 if (!opp_table)
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001207 return ERR_PTR(-ENOMEM);
Viresh Kumar07cce742014-12-10 09:45:34 +05301208
Viresh Kumar3d255692018-08-03 07:05:21 +05301209 mutex_init(&opp_table->lock);
Viresh Kumar4f018bc2018-06-26 16:29:34 +05301210 mutex_init(&opp_table->genpd_virt_dev_lock);
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301211 INIT_LIST_HEAD(&opp_table->dev_list);
Viresh Kumar7eba0c72019-11-25 13:57:58 +05301212 INIT_LIST_HEAD(&opp_table->lazy);
Viresh Kumar06441652015-07-29 16:23:04 +05301213
Viresh Kumar46f48ac2018-12-11 16:39:36 +05301214 /* Mark regulator count uninitialized */
1215 opp_table->regulator_count = -1;
1216
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301217 opp_dev = _add_opp_dev(dev, opp_table);
1218 if (!opp_dev) {
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001219 ret = -ENOMEM;
1220 goto err;
Viresh Kumar06441652015-07-29 16:23:04 +05301221 }
1222
Viresh Kumareb7c87432018-09-05 16:17:14 +05301223 _of_init_opp_table(opp_table, dev, index);
Viresh Kumar50f8cfb2016-02-09 10:30:37 +05301224
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001225 /* Find interconnect path(s) for the device */
1226 ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001227 if (ret) {
1228 if (ret == -EPROBE_DEFER)
Viresh Kumar32439ac2021-01-28 12:05:22 +05301229 goto remove_opp_dev;
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001230
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001231 dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
1232 __func__, ret);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001233 }
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001234
Viresh Kumar052c6f12017-01-23 10:11:49 +05301235 BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301236 INIT_LIST_HEAD(&opp_table->opp_list);
Viresh Kumarf067a982017-01-23 10:11:42 +05301237 kref_init(&opp_table->kref);
Viresh Kumar07cce742014-12-10 09:45:34 +05301238
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301239 return opp_table;
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001240
Quanyang Wang976509b2020-12-24 18:49:27 +08001241remove_opp_dev:
1242 _remove_opp_dev(opp_dev, opp_table);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001243err:
1244 kfree(opp_table);
1245 return ERR_PTR(ret);
Viresh Kumar07cce742014-12-10 09:45:34 +05301246}
1247
Viresh Kumarf067a982017-01-23 10:11:42 +05301248void _get_opp_table_kref(struct opp_table *opp_table)
Viresh Kumar3bac42c2015-07-29 16:22:59 +05301249{
Viresh Kumarf067a982017-01-23 10:11:42 +05301250 kref_get(&opp_table->kref);
1251}
1252
Viresh Kumar32439ac2021-01-28 12:05:22 +05301253static struct opp_table *_update_opp_table_clk(struct device *dev,
1254 struct opp_table *opp_table,
1255 bool getclk)
1256{
Viresh Kumard4a4c7a2021-01-29 16:12:04 +05301257 int ret;
1258
Viresh Kumar32439ac2021-01-28 12:05:22 +05301259 /*
1260 * Return early if we don't need to get clk or we have already tried it
1261 * earlier.
1262 */
1263 if (!getclk || IS_ERR(opp_table) || opp_table->clk)
1264 return opp_table;
1265
1266 /* Find clk for the device */
1267 opp_table->clk = clk_get(dev, NULL);
Viresh Kumar32439ac2021-01-28 12:05:22 +05301268
Viresh Kumard4a4c7a2021-01-29 16:12:04 +05301269 ret = PTR_ERR_OR_ZERO(opp_table->clk);
1270 if (!ret)
1271 return opp_table;
Viresh Kumar32439ac2021-01-28 12:05:22 +05301272
Viresh Kumard4a4c7a2021-01-29 16:12:04 +05301273 if (ret == -ENOENT) {
Viresh Kumar32439ac2021-01-28 12:05:22 +05301274 dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
Viresh Kumard4a4c7a2021-01-29 16:12:04 +05301275 return opp_table;
Viresh Kumar32439ac2021-01-28 12:05:22 +05301276 }
1277
Viresh Kumard4a4c7a2021-01-29 16:12:04 +05301278 dev_pm_opp_put_opp_table(opp_table);
1279 dev_err_probe(dev, ret, "Couldn't find clock\n");
1280
1281 return ERR_PTR(ret);
Viresh Kumar32439ac2021-01-28 12:05:22 +05301282}
1283
Viresh Kumar27c09482020-10-27 16:53:21 +05301284/*
1285 * We need to make sure that the OPP table for a device doesn't get added twice,
1286 * if this routine gets called in parallel with the same device pointer.
1287 *
1288 * The simplest way to enforce that is to perform everything (find existing
1289 * table and if not found, create a new one) under the opp_table_lock, so only
1290 * one creator gets access to the same. But that expands the critical section
1291 * under the lock and may end up causing circular dependencies with frameworks
1292 * like debugfs, interconnect or clock framework as they may be direct or
1293 * indirect users of OPP core.
1294 *
1295 * And for that reason we have to go for a bit tricky implementation here, which
1296 * uses the opp_tables_busy flag to indicate if another creator is in the middle
1297 * of adding an OPP table and others should wait for it to finish.
1298 */
Viresh Kumar32439ac2021-01-28 12:05:22 +05301299struct opp_table *_add_opp_table_indexed(struct device *dev, int index,
1300 bool getclk)
Viresh Kumarf067a982017-01-23 10:11:42 +05301301{
1302 struct opp_table *opp_table;
1303
Viresh Kumar27c09482020-10-27 16:53:21 +05301304again:
Viresh Kumarf067a982017-01-23 10:11:42 +05301305 mutex_lock(&opp_table_lock);
1306
Viresh Kumar5b650b32017-01-23 10:11:48 +05301307 opp_table = _find_opp_table_unlocked(dev);
1308 if (!IS_ERR(opp_table))
Viresh Kumarf067a982017-01-23 10:11:42 +05301309 goto unlock;
Viresh Kumarf067a982017-01-23 10:11:42 +05301310
Viresh Kumar27c09482020-10-27 16:53:21 +05301311 /*
1312 * The opp_tables list or an OPP table's dev_list is getting updated by
1313 * another user, wait for it to finish.
1314 */
1315 if (unlikely(opp_tables_busy)) {
1316 mutex_unlock(&opp_table_lock);
1317 cpu_relax();
1318 goto again;
1319 }
1320
1321 opp_tables_busy = true;
Viresh Kumar283d55e2018-09-07 09:01:54 +05301322 opp_table = _managed_opp(dev, index);
Viresh Kumar27c09482020-10-27 16:53:21 +05301323
1324 /* Drop the lock to reduce the size of critical section */
1325 mutex_unlock(&opp_table_lock);
1326
Viresh Kumar283d55e2018-09-07 09:01:54 +05301327 if (opp_table) {
Viresh Kumaref43f012020-10-22 12:12:27 +05301328 if (!_add_opp_dev(dev, opp_table)) {
Viresh Kumar283d55e2018-09-07 09:01:54 +05301329 dev_pm_opp_put_opp_table(opp_table);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001330 opp_table = ERR_PTR(-ENOMEM);
Viresh Kumar283d55e2018-09-07 09:01:54 +05301331 }
Viresh Kumar27c09482020-10-27 16:53:21 +05301332
1333 mutex_lock(&opp_table_lock);
1334 } else {
1335 opp_table = _allocate_opp_table(dev, index);
1336
1337 mutex_lock(&opp_table_lock);
1338 if (!IS_ERR(opp_table))
1339 list_add(&opp_table->node, &opp_tables);
Viresh Kumar283d55e2018-09-07 09:01:54 +05301340 }
1341
Viresh Kumar27c09482020-10-27 16:53:21 +05301342 opp_tables_busy = false;
Viresh Kumarf067a982017-01-23 10:11:42 +05301343
1344unlock:
1345 mutex_unlock(&opp_table_lock);
1346
Viresh Kumar32439ac2021-01-28 12:05:22 +05301347 return _update_opp_table_clk(dev, opp_table, getclk);
Viresh Kumarf067a982017-01-23 10:11:42 +05301348}
Viresh Kumareb7c87432018-09-05 16:17:14 +05301349
Viresh Kumar32439ac2021-01-28 12:05:22 +05301350static struct opp_table *_add_opp_table(struct device *dev, bool getclk)
Viresh Kumare77dcb02020-11-06 10:37:16 +05301351{
Viresh Kumar32439ac2021-01-28 12:05:22 +05301352 return _add_opp_table_indexed(dev, 0, getclk);
Viresh Kumare77dcb02020-11-06 10:37:16 +05301353}
1354
Viresh Kumareb7c87432018-09-05 16:17:14 +05301355struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
1356{
Viresh Kumare77dcb02020-11-06 10:37:16 +05301357 return _find_opp_table(dev);
Viresh Kumareb7c87432018-09-05 16:17:14 +05301358}
Viresh Kumarf067a982017-01-23 10:11:42 +05301359EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
1360
Viresh Kumarb83c1892017-01-23 10:11:45 +05301361static void _opp_table_kref_release(struct kref *kref)
Viresh Kumarf067a982017-01-23 10:11:42 +05301362{
1363 struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
Viresh Kumarcdd6ed92018-09-12 12:35:19 +05301364 struct opp_device *opp_dev, *temp;
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001365 int i;
Viresh Kumar06441652015-07-29 16:23:04 +05301366
Viresh Kumare0df59d2020-10-22 12:26:08 +05301367 /* Drop the lock as soon as we can */
1368 list_del(&opp_table->node);
1369 mutex_unlock(&opp_table_lock);
1370
Viresh Kumar81c4d8a2021-01-20 16:16:48 +05301371 if (opp_table->current_opp)
1372 dev_pm_opp_put(opp_table->current_opp);
1373
Viresh Kumar5d6d1062018-06-07 14:50:43 +05301374 _of_clear_opp_table(opp_table);
1375
Viresh Kumard54974c2016-02-09 10:30:38 +05301376 /* Release clk */
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301377 if (!IS_ERR(opp_table->clk))
1378 clk_put(opp_table->clk);
Viresh Kumard54974c2016-02-09 10:30:38 +05301379
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001380 if (opp_table->paths) {
1381 for (i = 0; i < opp_table->path_count; i++)
1382 icc_put(opp_table->paths[i]);
1383 kfree(opp_table->paths);
1384 }
1385
Viresh Kumarcdd6ed92018-09-12 12:35:19 +05301386 WARN_ON(!list_empty(&opp_table->opp_list));
Viresh Kumar06441652015-07-29 16:23:04 +05301387
Viresh Kumarcdd6ed92018-09-12 12:35:19 +05301388 list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
1389 /*
1390 * The OPP table is getting removed, drop the performance state
1391 * constraints.
1392 */
1393 if (opp_table->genpd_performance_state)
1394 dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);
Viresh Kumar06441652015-07-29 16:23:04 +05301395
Viresh Kumarcdd6ed92018-09-12 12:35:19 +05301396 _remove_opp_dev(opp_dev, opp_table);
1397 }
Viresh Kumar06441652015-07-29 16:23:04 +05301398
Viresh Kumar4f018bc2018-06-26 16:29:34 +05301399 mutex_destroy(&opp_table->genpd_virt_dev_lock);
Viresh Kumar37a73ec2017-01-23 10:11:41 +05301400 mutex_destroy(&opp_table->lock);
Viresh Kumar052c6f12017-01-23 10:11:49 +05301401 kfree(opp_table);
Viresh Kumarf067a982017-01-23 10:11:42 +05301402}
1403
1404void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
1405{
1406 kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
1407 &opp_table_lock);
1408}
1409EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
1410
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301411void _opp_free(struct dev_pm_opp *opp)
Viresh Kumar969fceb2017-01-02 14:40:59 +05301412{
1413 kfree(opp);
Viresh Kumar969fceb2017-01-02 14:40:59 +05301414}
1415
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301416static void _opp_kref_release(struct kref *kref)
Viresh Kumar129eec52014-11-27 08:54:06 +05301417{
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301418 struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
1419 struct opp_table *opp_table = opp->opp_table;
1420
1421 list_del(&opp->node);
1422 mutex_unlock(&opp_table->lock);
1423
Viresh Kumar129eec52014-11-27 08:54:06 +05301424 /*
1425 * Notify the changes in the availability of the operable
1426 * frequency/voltage list.
1427 */
Viresh Kumar052c6f12017-01-23 10:11:49 +05301428 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
Viresh Kumarda544b62018-06-07 14:50:43 +05301429 _of_opp_free_required_opps(opp_table, opp);
Viresh Kumardeaa5142015-11-11 07:59:01 +05301430 opp_debug_remove_one(opp);
Viresh Kumar052c6f12017-01-23 10:11:49 +05301431 kfree(opp);
Viresh Kumar1690d8b2019-01-04 15:14:33 +05301432}
Viresh Kumar129eec52014-11-27 08:54:06 +05301433
Viresh Kumara88bd2a2017-11-29 15:18:36 +05301434void dev_pm_opp_get(struct dev_pm_opp *opp)
Viresh Kumar8a31d9d92017-01-23 10:11:47 +05301435{
1436 kref_get(&opp->kref);
1437}
1438
Viresh Kumar70347642017-01-23 10:11:46 +05301439void dev_pm_opp_put(struct dev_pm_opp *opp)
1440{
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301441 kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock);
Viresh Kumar70347642017-01-23 10:11:46 +05301442}
1443EXPORT_SYMBOL_GPL(dev_pm_opp_put);
1444
Viresh Kumar129eec52014-11-27 08:54:06 +05301445/**
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301446 * dev_pm_opp_remove() - Remove an OPP from OPP table
Viresh Kumar129eec52014-11-27 08:54:06 +05301447 * @dev: device for which we do this operation
1448 * @freq: OPP to remove with matching 'freq'
1449 *
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301450 * This function removes an opp from the opp table.
Viresh Kumar129eec52014-11-27 08:54:06 +05301451 */
1452void dev_pm_opp_remove(struct device *dev, unsigned long freq)
1453{
1454 struct dev_pm_opp *opp;
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301455 struct opp_table *opp_table;
Viresh Kumar129eec52014-11-27 08:54:06 +05301456 bool found = false;
1457
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301458 opp_table = _find_opp_table(dev);
1459 if (IS_ERR(opp_table))
Viresh Kumar5b650b32017-01-23 10:11:48 +05301460 return;
Viresh Kumar129eec52014-11-27 08:54:06 +05301461
Viresh Kumar37a73ec2017-01-23 10:11:41 +05301462 mutex_lock(&opp_table->lock);
1463
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301464 list_for_each_entry(opp, &opp_table->opp_list, node) {
Viresh Kumar129eec52014-11-27 08:54:06 +05301465 if (opp->rate == freq) {
1466 found = true;
1467 break;
1468 }
1469 }
1470
Viresh Kumar37a73ec2017-01-23 10:11:41 +05301471 mutex_unlock(&opp_table->lock);
1472
Viresh Kumar5b650b32017-01-23 10:11:48 +05301473 if (found) {
1474 dev_pm_opp_put(opp);
Viresh Kumar0ad8c622018-08-02 14:23:09 +05301475
1476 /* Drop the reference taken by dev_pm_opp_add() */
1477 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar5b650b32017-01-23 10:11:48 +05301478 } else {
Viresh Kumar129eec52014-11-27 08:54:06 +05301479 dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
1480 __func__, freq);
Viresh Kumar129eec52014-11-27 08:54:06 +05301481 }
1482
Viresh Kumar0ad8c622018-08-02 14:23:09 +05301483 /* Drop the reference taken by _find_opp_table() */
Viresh Kumar5b650b32017-01-23 10:11:48 +05301484 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar129eec52014-11-27 08:54:06 +05301485}
1486EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
1487
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301488static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
1489 bool dynamic)
1490{
1491 struct dev_pm_opp *opp = NULL, *temp;
1492
1493 mutex_lock(&opp_table->lock);
1494 list_for_each_entry(temp, &opp_table->opp_list, node) {
1495 if (dynamic == temp->dynamic) {
1496 opp = temp;
1497 break;
1498 }
1499 }
1500
1501 mutex_unlock(&opp_table->lock);
1502 return opp;
1503}
1504
Viresh Kumar922ff072020-08-31 13:03:06 +05301505bool _opp_remove_all_static(struct opp_table *opp_table)
Viresh Kumar03758d62019-11-11 16:35:03 +05301506{
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301507 struct dev_pm_opp *opp;
Viresh Kumar03758d62019-11-11 16:35:03 +05301508
1509 mutex_lock(&opp_table->lock);
1510
Viresh Kumar922ff072020-08-31 13:03:06 +05301511 if (!opp_table->parsed_static_opps) {
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301512 mutex_unlock(&opp_table->lock);
1513 return false;
Viresh Kumar922ff072020-08-31 13:03:06 +05301514 }
1515
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301516 if (--opp_table->parsed_static_opps) {
1517 mutex_unlock(&opp_table->lock);
1518 return true;
Viresh Kumar03758d62019-11-11 16:35:03 +05301519 }
1520
Viresh Kumar03758d62019-11-11 16:35:03 +05301521 mutex_unlock(&opp_table->lock);
Viresh Kumar922ff072020-08-31 13:03:06 +05301522
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301523 /*
1524 * Can't remove the OPP from under the lock, debugfs removal needs to
1525 * happen lock less to avoid circular dependency issues.
1526 */
1527 while ((opp = _opp_get_next(opp_table, false)))
1528 dev_pm_opp_put(opp);
1529
1530 return true;
Viresh Kumar03758d62019-11-11 16:35:03 +05301531}
1532
Viresh Kumar1690d8b2019-01-04 15:14:33 +05301533/**
1534 * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
1535 * @dev: device for which we do this operation
1536 *
1537 * This function removes all dynamically created OPPs from the opp table.
1538 */
1539void dev_pm_opp_remove_all_dynamic(struct device *dev)
1540{
1541 struct opp_table *opp_table;
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301542 struct dev_pm_opp *opp;
Viresh Kumar1690d8b2019-01-04 15:14:33 +05301543 int count = 0;
1544
1545 opp_table = _find_opp_table(dev);
1546 if (IS_ERR(opp_table))
1547 return;
1548
Viresh Kumarcf1fac92020-11-19 11:24:32 +05301549 /*
1550 * Can't remove the OPP from under the lock, debugfs removal needs to
1551 * happen lock less to avoid circular dependency issues.
1552 */
1553 while ((opp = _opp_get_next(opp_table, true))) {
1554 dev_pm_opp_put(opp);
1555 count++;
Viresh Kumar1690d8b2019-01-04 15:14:33 +05301556 }
Viresh Kumar1690d8b2019-01-04 15:14:33 +05301557
1558 /* Drop the references taken by dev_pm_opp_add() */
1559 while (count--)
1560 dev_pm_opp_put_opp_table(opp_table);
1561
1562 /* Drop the reference taken by _find_opp_table() */
1563 dev_pm_opp_put_opp_table(opp_table);
1564}
1565EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
1566
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301567struct dev_pm_opp *_opp_allocate(struct opp_table *table)
Viresh Kumar23dacf62015-07-29 16:23:01 +05301568{
1569 struct dev_pm_opp *opp;
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001570 int supply_count, supply_size, icc_size;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301571
Viresh Kumardfbe4672016-12-01 16:28:19 +05301572 /* Allocate space for at least one supply */
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001573 supply_count = table->regulator_count > 0 ? table->regulator_count : 1;
1574 supply_size = sizeof(*opp->supplies) * supply_count;
1575 icc_size = sizeof(*opp->bandwidth) * table->path_count;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301576
Viresh Kumardfbe4672016-12-01 16:28:19 +05301577 /* allocate new OPP node and supplies structures */
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001578 opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL);
1579
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301580 if (!opp)
Viresh Kumar23dacf62015-07-29 16:23:01 +05301581 return NULL;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301582
Viresh Kumardfbe4672016-12-01 16:28:19 +05301583 /* Put the supplies at the end of the OPP structure as an empty array */
1584 opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001585 if (icc_size)
1586 opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count);
Viresh Kumardfbe4672016-12-01 16:28:19 +05301587 INIT_LIST_HEAD(&opp->node);
1588
Viresh Kumar23dacf62015-07-29 16:23:01 +05301589 return opp;
1590}
1591
Viresh Kumar7d34d562016-02-09 10:30:34 +05301592static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301593 struct opp_table *opp_table)
Viresh Kumar7d34d562016-02-09 10:30:34 +05301594{
Viresh Kumardfbe4672016-12-01 16:28:19 +05301595 struct regulator *reg;
1596 int i;
Viresh Kumar7d34d562016-02-09 10:30:34 +05301597
Viresh Kumar90e35772018-12-11 16:32:47 +05301598 if (!opp_table->regulators)
1599 return true;
1600
Viresh Kumardfbe4672016-12-01 16:28:19 +05301601 for (i = 0; i < opp_table->regulator_count; i++) {
1602 reg = opp_table->regulators[i];
1603
1604 if (!regulator_is_supported_voltage(reg,
1605 opp->supplies[i].u_volt_min,
1606 opp->supplies[i].u_volt_max)) {
1607 pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
1608 __func__, opp->supplies[i].u_volt_min,
1609 opp->supplies[i].u_volt_max);
1610 return false;
1611 }
Viresh Kumar7d34d562016-02-09 10:30:34 +05301612 }
1613
1614 return true;
1615}
1616
Saravana Kannan6c591ee2020-05-12 15:53:19 +03001617int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
1618{
1619 if (opp1->rate != opp2->rate)
1620 return opp1->rate < opp2->rate ? -1 : 1;
Georgi Djakov6d3f9222020-05-12 15:53:21 +03001621 if (opp1->bandwidth && opp2->bandwidth &&
1622 opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
1623 return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;
Saravana Kannan6c591ee2020-05-12 15:53:19 +03001624 if (opp1->level != opp2->level)
1625 return opp1->level < opp2->level ? -1 : 1;
1626 return 0;
1627}
1628
Viresh Kumara1e8c132018-04-06 14:35:45 +05301629static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
1630 struct opp_table *opp_table,
1631 struct list_head **head)
1632{
1633 struct dev_pm_opp *opp;
Saravana Kannan6c591ee2020-05-12 15:53:19 +03001634 int opp_cmp;
Viresh Kumara1e8c132018-04-06 14:35:45 +05301635
1636 /*
1637 * Insert new OPP in order of increasing frequency and discard if
1638 * already present.
1639 *
1640 * Need to use &opp_table->opp_list in the condition part of the 'for'
1641 * loop, don't replace it with head otherwise it will become an infinite
1642 * loop.
1643 */
1644 list_for_each_entry(opp, &opp_table->opp_list, node) {
Saravana Kannan6c591ee2020-05-12 15:53:19 +03001645 opp_cmp = _opp_compare_key(new_opp, opp);
1646 if (opp_cmp > 0) {
Viresh Kumara1e8c132018-04-06 14:35:45 +05301647 *head = &opp->node;
1648 continue;
1649 }
1650
Saravana Kannan6c591ee2020-05-12 15:53:19 +03001651 if (opp_cmp < 0)
Viresh Kumara1e8c132018-04-06 14:35:45 +05301652 return 0;
1653
1654 /* Duplicate OPPs */
1655 dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
1656 __func__, opp->rate, opp->supplies[0].u_volt,
1657 opp->available, new_opp->rate,
1658 new_opp->supplies[0].u_volt, new_opp->available);
1659
1660 /* Should we compare voltages for all regulators here ? */
1661 return opp->available &&
1662 new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
1663 }
1664
1665 return 0;
1666}
1667
Viresh Kumar7eba0c72019-11-25 13:57:58 +05301668void _required_opps_available(struct dev_pm_opp *opp, int count)
1669{
1670 int i;
1671
1672 for (i = 0; i < count; i++) {
1673 if (opp->required_opps[i]->available)
1674 continue;
1675
1676 opp->available = false;
1677 pr_warn("%s: OPP not supported by required OPP %pOF (%lu)\n",
1678 __func__, opp->required_opps[i]->np, opp->rate);
1679 return;
1680 }
1681}
1682
Viresh Kumar7f8538e2017-01-02 14:40:55 +05301683/*
1684 * Returns:
1685 * 0: On success. And appropriate error message for duplicate OPPs.
1686 * -EBUSY: For OPP with same freq/volt and is available. The callers of
1687 * _opp_add() must return 0 if they receive -EBUSY from it. This is to make
1688 * sure we don't print error messages unnecessarily if different parts of
1689 * kernel try to initialize the OPP table.
1690 * -EEXIST: For OPP with same freq but different volt or is unavailable. This
1691 * should be considered an error by the callers of _opp_add().
1692 */
Viresh Kumarf47b72a2016-05-05 16:20:33 +05301693int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
Viresh Kumara1e8c132018-04-06 14:35:45 +05301694 struct opp_table *opp_table, bool rate_not_available)
Viresh Kumar23dacf62015-07-29 16:23:01 +05301695{
Viresh Kumar37a73ec2017-01-23 10:11:41 +05301696 struct list_head *head;
Viresh Kumardeaa5142015-11-11 07:59:01 +05301697 int ret;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301698
Viresh Kumar37a73ec2017-01-23 10:11:41 +05301699 mutex_lock(&opp_table->lock);
1700 head = &opp_table->opp_list;
1701
Dmitry Osipenko32715be2021-01-18 03:55:13 +03001702 ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
1703 if (ret) {
1704 mutex_unlock(&opp_table->lock);
1705 return ret;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301706 }
1707
Viresh Kumar052c6f12017-01-23 10:11:49 +05301708 list_add(&new_opp->node, head);
Viresh Kumar37a73ec2017-01-23 10:11:41 +05301709 mutex_unlock(&opp_table->lock);
1710
1711 new_opp->opp_table = opp_table;
Viresh Kumar70347642017-01-23 10:11:46 +05301712 kref_init(&new_opp->kref);
Viresh Kumar23dacf62015-07-29 16:23:01 +05301713
Greg Kroah-Hartmana2dea4c2019-01-22 16:21:17 +01001714 opp_debug_create_one(new_opp, opp_table);
Viresh Kumardeaa5142015-11-11 07:59:01 +05301715
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301716 if (!_opp_supported_by_regulators(new_opp, opp_table)) {
Viresh Kumar7d34d562016-02-09 10:30:34 +05301717 new_opp->available = false;
1718 dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
1719 __func__, new_opp->rate);
1720 }
1721
Viresh Kumar7eba0c72019-11-25 13:57:58 +05301722 /* required-opps not fully initialized yet */
1723 if (lazy_linking_pending(opp_table))
1724 return 0;
Dmitry Osipenkocf659482021-01-18 03:55:14 +03001725
Viresh Kumar7eba0c72019-11-25 13:57:58 +05301726 _required_opps_available(new_opp, opp_table->required_opp_count);
Dmitry Osipenkocf659482021-01-18 03:55:14 +03001727
Viresh Kumar23dacf62015-07-29 16:23:01 +05301728 return 0;
1729}
1730
Viresh Kumar737002b2015-07-29 16:22:58 +05301731/**
Viresh Kumarb64b9c3f2015-10-15 21:42:44 +05301732 * _opp_add_v1() - Allocate a OPP based on v1 bindings.
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301733 * @opp_table: OPP table
Nishanth Menone1f60b22010-10-13 00:13:10 +02001734 * @dev: device for which we do this operation
1735 * @freq: Frequency in Hz for this OPP
1736 * @u_volt: Voltage in uVolts for this OPP
1737 * @dynamic: Dynamically added OPPs.
1738 *
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301739 * This function adds an opp definition to the opp table and returns status.
Nishanth Menone1f60b22010-10-13 00:13:10 +02001740 * The opp is made available by default and it can be controlled using
1741 * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
1742 *
Viresh Kumar8f8d37b2015-09-04 13:47:24 +05301743 * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
1744 * and freed by dev_pm_opp_of_remove_table.
Nishanth Menone1f60b22010-10-13 00:13:10 +02001745 *
Nishanth Menone1f60b22010-10-13 00:13:10 +02001746 * Return:
1747 * 0 On success OR
1748 * Duplicate OPPs (both freq and volt are same) and opp->available
1749 * -EEXIST Freq are same and volt are different OR
1750 * Duplicate OPPs (both freq and volt are same) and !opp->available
1751 * -ENOMEM Memory allocation failure
1752 */
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301753int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
1754 unsigned long freq, long u_volt, bool dynamic)
Nishanth Menone1f60b22010-10-13 00:13:10 +02001755{
Viresh Kumar23dacf62015-07-29 16:23:01 +05301756 struct dev_pm_opp *new_opp;
Viresh Kumar50f8cfb2016-02-09 10:30:37 +05301757 unsigned long tol;
Nishanth Menone1f60b22010-10-13 00:13:10 +02001758 int ret;
1759
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301760 new_opp = _opp_allocate(opp_table);
1761 if (!new_opp)
1762 return -ENOMEM;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301763
Nishanth Menone1f60b22010-10-13 00:13:10 +02001764 /* populate the opp table */
1765 new_opp->rate = freq;
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301766 tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
Viresh Kumardfbe4672016-12-01 16:28:19 +05301767 new_opp->supplies[0].u_volt = u_volt;
1768 new_opp->supplies[0].u_volt_min = u_volt - tol;
1769 new_opp->supplies[0].u_volt_max = u_volt + tol;
Nishanth Menone1f60b22010-10-13 00:13:10 +02001770 new_opp->available = true;
Viresh Kumaraa5f2f82015-07-29 16:23:00 +05301771 new_opp->dynamic = dynamic;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301772
Viresh Kumara1e8c132018-04-06 14:35:45 +05301773 ret = _opp_add(dev, new_opp, opp_table, false);
Viresh Kumar7f8538e2017-01-02 14:40:55 +05301774 if (ret) {
1775 /* Don't return error for duplicate OPPs */
1776 if (ret == -EBUSY)
1777 ret = 0;
Viresh Kumar23dacf62015-07-29 16:23:01 +05301778 goto free_opp;
Viresh Kumar7f8538e2017-01-02 14:40:55 +05301779 }
Viresh Kumar23dacf62015-07-29 16:23:01 +05301780
Nishanth Menone1f60b22010-10-13 00:13:10 +02001781 /*
1782 * Notify the changes in the availability of the operable
1783 * frequency/voltage list.
1784 */
Viresh Kumar052c6f12017-01-23 10:11:49 +05301785 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
Nishanth Menone1f60b22010-10-13 00:13:10 +02001786 return 0;
1787
1788free_opp:
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05301789 _opp_free(new_opp);
1790
Nishanth Menone1f60b22010-10-13 00:13:10 +02001791 return ret;
1792}
Viresh Kumar383934092014-11-25 16:04:18 +05301793
Viresh Kumar27465902015-07-29 16:23:02 +05301794/**
Viresh Kumar7de36b02015-12-09 08:01:46 +05301795 * dev_pm_opp_set_supported_hw() - Set supported platforms
1796 * @dev: Device for which supported-hw has to be set.
1797 * @versions: Array of hierarchy of versions to match.
1798 * @count: Number of elements in the array.
1799 *
1800 * This is required only for the V2 bindings, and it enables a platform to
1801 * specify the hierarchy of versions it supports. OPP layer will then enable
1802 * OPPs, which are available for those versions, based on its 'opp-supported-hw'
1803 * property.
Viresh Kumar7de36b02015-12-09 08:01:46 +05301804 */
Viresh Kumarfa301842017-01-23 10:11:43 +05301805struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
1806 const u32 *versions, unsigned int count)
Viresh Kumar7de36b02015-12-09 08:01:46 +05301807{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301808 struct opp_table *opp_table;
Viresh Kumar7de36b02015-12-09 08:01:46 +05301809
Viresh Kumar32439ac2021-01-28 12:05:22 +05301810 opp_table = _add_opp_table(dev, false);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001811 if (IS_ERR(opp_table))
1812 return opp_table;
Viresh Kumar7de36b02015-12-09 08:01:46 +05301813
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301814 /* Make sure there are no concurrent readers while updating opp_table */
1815 WARN_ON(!list_empty(&opp_table->opp_list));
Viresh Kumar7de36b02015-12-09 08:01:46 +05301816
Viresh Kumar25419de2018-05-22 16:38:08 +05301817 /* Another CPU that shares the OPP table has set the property ? */
1818 if (opp_table->supported_hw)
1819 return opp_table;
Viresh Kumar7de36b02015-12-09 08:01:46 +05301820
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301821 opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
Viresh Kumar7de36b02015-12-09 08:01:46 +05301822 GFP_KERNEL);
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301823 if (!opp_table->supported_hw) {
Viresh Kumar25419de2018-05-22 16:38:08 +05301824 dev_pm_opp_put_opp_table(opp_table);
1825 return ERR_PTR(-ENOMEM);
Viresh Kumar7de36b02015-12-09 08:01:46 +05301826 }
1827
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301828 opp_table->supported_hw_count = count;
Viresh Kumarfa301842017-01-23 10:11:43 +05301829
1830 return opp_table;
Viresh Kumar7de36b02015-12-09 08:01:46 +05301831}
1832EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
1833
1834/**
1835 * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw
Viresh Kumarfa301842017-01-23 10:11:43 +05301836 * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().
Viresh Kumar7de36b02015-12-09 08:01:46 +05301837 *
1838 * This is required only for the V2 bindings, and is called for a matching
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301839 * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
Viresh Kumar7de36b02015-12-09 08:01:46 +05301840 * will not be freed.
Viresh Kumar7de36b02015-12-09 08:01:46 +05301841 */
Viresh Kumarfa301842017-01-23 10:11:43 +05301842void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
Viresh Kumar7de36b02015-12-09 08:01:46 +05301843{
Viresh Kumarc7bf8752020-11-06 12:16:52 +05301844 if (unlikely(!opp_table))
1845 return;
1846
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301847 /* Make sure there are no concurrent readers while updating opp_table */
1848 WARN_ON(!list_empty(&opp_table->opp_list));
Viresh Kumar7de36b02015-12-09 08:01:46 +05301849
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301850 kfree(opp_table->supported_hw);
1851 opp_table->supported_hw = NULL;
1852 opp_table->supported_hw_count = 0;
Viresh Kumar7de36b02015-12-09 08:01:46 +05301853
Viresh Kumarfa301842017-01-23 10:11:43 +05301854 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar7de36b02015-12-09 08:01:46 +05301855}
1856EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
1857
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301858/**
1859 * dev_pm_opp_set_prop_name() - Set prop-extn name
Viresh Kumara5da6442016-02-16 14:17:52 +05301860 * @dev: Device for which the prop-name has to be set.
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301861 * @name: name to postfix to properties.
1862 *
1863 * This is required only for the V2 bindings, and it enables a platform to
1864 * specify the extn to be used for certain property names. The properties to
1865 * which the extension will apply are opp-microvolt and opp-microamp. OPP core
1866 * should postfix the property name with -<name> while looking for them.
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301867 */
Viresh Kumarfa301842017-01-23 10:11:43 +05301868struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301869{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301870 struct opp_table *opp_table;
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301871
Viresh Kumar32439ac2021-01-28 12:05:22 +05301872 opp_table = _add_opp_table(dev, false);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001873 if (IS_ERR(opp_table))
1874 return opp_table;
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301875
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301876 /* Make sure there are no concurrent readers while updating opp_table */
1877 WARN_ON(!list_empty(&opp_table->opp_list));
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301878
Viresh Kumar878ec1a2018-05-22 16:38:08 +05301879 /* Another CPU that shares the OPP table has set the property ? */
1880 if (opp_table->prop_name)
1881 return opp_table;
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301882
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301883 opp_table->prop_name = kstrdup(name, GFP_KERNEL);
1884 if (!opp_table->prop_name) {
Viresh Kumar878ec1a2018-05-22 16:38:08 +05301885 dev_pm_opp_put_opp_table(opp_table);
1886 return ERR_PTR(-ENOMEM);
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301887 }
1888
Viresh Kumarfa301842017-01-23 10:11:43 +05301889 return opp_table;
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301890}
1891EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
1892
1893/**
1894 * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name
Viresh Kumarfa301842017-01-23 10:11:43 +05301895 * @opp_table: OPP table returned by dev_pm_opp_set_prop_name().
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301896 *
1897 * This is required only for the V2 bindings, and is called for a matching
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301898 * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301899 * will not be freed.
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301900 */
Viresh Kumarfa301842017-01-23 10:11:43 +05301901void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301902{
Viresh Kumarc7bf8752020-11-06 12:16:52 +05301903 if (unlikely(!opp_table))
1904 return;
1905
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301906 /* Make sure there are no concurrent readers while updating opp_table */
1907 WARN_ON(!list_empty(&opp_table->opp_list));
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301908
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301909 kfree(opp_table->prop_name);
1910 opp_table->prop_name = NULL;
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301911
Viresh Kumarfa301842017-01-23 10:11:43 +05301912 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar01fb4d32015-12-09 08:01:47 +05301913}
1914EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
1915
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301916/**
Viresh Kumardfbe4672016-12-01 16:28:19 +05301917 * dev_pm_opp_set_regulators() - Set regulator names for the device
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301918 * @dev: Device for which regulator name is being set.
Viresh Kumardfbe4672016-12-01 16:28:19 +05301919 * @names: Array of pointers to the names of the regulator.
1920 * @count: Number of regulators.
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301921 *
1922 * In order to support OPP switching, OPP layer needs to know the name of the
Viresh Kumardfbe4672016-12-01 16:28:19 +05301923 * device's regulators, as the core would be required to switch voltages as
1924 * well.
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301925 *
1926 * This must be called before any OPPs are initialized for the device.
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301927 */
Viresh Kumardfbe4672016-12-01 16:28:19 +05301928struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
1929 const char * const names[],
1930 unsigned int count)
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301931{
Viresh Kumar38bb3432021-01-19 11:58:58 +05301932 struct dev_pm_opp_supply *supplies;
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301933 struct opp_table *opp_table;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301934 struct regulator *reg;
Viresh Kumardfbe4672016-12-01 16:28:19 +05301935 int ret, i;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301936
Viresh Kumar32439ac2021-01-28 12:05:22 +05301937 opp_table = _add_opp_table(dev, false);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02001938 if (IS_ERR(opp_table))
1939 return opp_table;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301940
1941 /* This should be called before OPPs are initialized */
Viresh Kumar2c2709d2016-02-16 14:17:53 +05301942 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301943 ret = -EBUSY;
1944 goto err;
1945 }
1946
Viresh Kumar779b7832018-05-22 16:38:08 +05301947 /* Another CPU that shares the OPP table has set the regulators ? */
1948 if (opp_table->regulators)
1949 return opp_table;
Viresh Kumardfbe4672016-12-01 16:28:19 +05301950
1951 opp_table->regulators = kmalloc_array(count,
1952 sizeof(*opp_table->regulators),
1953 GFP_KERNEL);
1954 if (!opp_table->regulators) {
1955 ret = -ENOMEM;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301956 goto err;
1957 }
1958
Viresh Kumardfbe4672016-12-01 16:28:19 +05301959 for (i = 0; i < count; i++) {
1960 reg = regulator_get_optional(dev, names[i]);
1961 if (IS_ERR(reg)) {
1962 ret = PTR_ERR(reg);
1963 if (ret != -EPROBE_DEFER)
1964 dev_err(dev, "%s: no regulator (%s) found: %d\n",
1965 __func__, names[i], ret);
1966 goto free_regulators;
1967 }
1968
1969 opp_table->regulators[i] = reg;
1970 }
1971
1972 opp_table->regulator_count = count;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301973
Viresh Kumar38bb3432021-01-19 11:58:58 +05301974 supplies = kmalloc_array(count * 2, sizeof(*supplies), GFP_KERNEL);
1975 if (!supplies) {
1976 ret = -ENOMEM;
Viresh Kumar94735582016-12-01 16:28:20 +05301977 goto free_regulators;
Viresh Kumar38bb3432021-01-19 11:58:58 +05301978 }
1979
1980 mutex_lock(&opp_table->lock);
1981 opp_table->sod_supplies = supplies;
1982 if (opp_table->set_opp_data) {
1983 opp_table->set_opp_data->old_opp.supplies = supplies;
1984 opp_table->set_opp_data->new_opp.supplies = supplies + count;
1985 }
1986 mutex_unlock(&opp_table->lock);
Viresh Kumar94735582016-12-01 16:28:20 +05301987
Stephen Boyd91291d92016-11-30 16:21:25 +05301988 return opp_table;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301989
Viresh Kumardfbe4672016-12-01 16:28:19 +05301990free_regulators:
Marek Szyprowski24957db2019-10-17 12:27:58 +02001991 while (i != 0)
1992 regulator_put(opp_table->regulators[--i]);
Viresh Kumardfbe4672016-12-01 16:28:19 +05301993
1994 kfree(opp_table->regulators);
1995 opp_table->regulators = NULL;
Viresh Kumar46f48ac2018-12-11 16:39:36 +05301996 opp_table->regulator_count = -1;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301997err:
Viresh Kumarfa301842017-01-23 10:11:43 +05301998 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar9f8ea962016-02-09 10:30:33 +05301999
Stephen Boyd91291d92016-11-30 16:21:25 +05302000 return ERR_PTR(ret);
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302001}
Viresh Kumardfbe4672016-12-01 16:28:19 +05302002EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302003
2004/**
Viresh Kumardfbe4672016-12-01 16:28:19 +05302005 * dev_pm_opp_put_regulators() - Releases resources blocked for regulator
2006 * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302007 */
Viresh Kumardfbe4672016-12-01 16:28:19 +05302008void dev_pm_opp_put_regulators(struct opp_table *opp_table)
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302009{
Viresh Kumardfbe4672016-12-01 16:28:19 +05302010 int i;
2011
Viresh Kumarc7bf8752020-11-06 12:16:52 +05302012 if (unlikely(!opp_table))
2013 return;
2014
Viresh Kumar779b7832018-05-22 16:38:08 +05302015 if (!opp_table->regulators)
2016 goto put_opp_table;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302017
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302018 /* Make sure there are no concurrent readers while updating opp_table */
2019 WARN_ON(!list_empty(&opp_table->opp_list));
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302020
Viresh Kumar72f80ce2020-08-13 08:38:37 +05302021 if (opp_table->enabled) {
Kamil Konieczny8d457192019-07-19 17:05:32 +02002022 for (i = opp_table->regulator_count - 1; i >= 0; i--)
2023 regulator_disable(opp_table->regulators[i]);
Kamil Konieczny8d457192019-07-19 17:05:32 +02002024 }
2025
Marek Szyprowski24957db2019-10-17 12:27:58 +02002026 for (i = opp_table->regulator_count - 1; i >= 0; i--)
Viresh Kumardfbe4672016-12-01 16:28:19 +05302027 regulator_put(opp_table->regulators[i]);
2028
Viresh Kumar38bb3432021-01-19 11:58:58 +05302029 mutex_lock(&opp_table->lock);
2030 if (opp_table->set_opp_data) {
2031 opp_table->set_opp_data->old_opp.supplies = NULL;
2032 opp_table->set_opp_data->new_opp.supplies = NULL;
2033 }
2034
2035 kfree(opp_table->sod_supplies);
2036 opp_table->sod_supplies = NULL;
2037 mutex_unlock(&opp_table->lock);
Viresh Kumar94735582016-12-01 16:28:20 +05302038
Viresh Kumardfbe4672016-12-01 16:28:19 +05302039 kfree(opp_table->regulators);
2040 opp_table->regulators = NULL;
Viresh Kumar46f48ac2018-12-11 16:39:36 +05302041 opp_table->regulator_count = -1;
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302042
Viresh Kumar779b7832018-05-22 16:38:08 +05302043put_opp_table:
Viresh Kumarfa301842017-01-23 10:11:43 +05302044 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302045}
Viresh Kumardfbe4672016-12-01 16:28:19 +05302046EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
Viresh Kumar9f8ea962016-02-09 10:30:33 +05302047
Viresh Kumar383934092014-11-25 16:04:18 +05302048/**
Viresh Kumar829a4e82017-06-21 10:29:13 +05302049 * dev_pm_opp_set_clkname() - Set clk name for the device
2050 * @dev: Device for which clk name is being set.
2051 * @name: Clk name.
2052 *
2053 * In order to support OPP switching, OPP layer needs to get pointer to the
2054 * clock for the device. Simple cases work fine without using this routine (i.e.
2055 * by passing connection-id as NULL), but for a device with multiple clocks
2056 * available, the OPP core needs to know the exact name of the clk to use.
2057 *
2058 * This must be called before any OPPs are initialized for the device.
2059 */
2060struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
2061{
2062 struct opp_table *opp_table;
2063 int ret;
2064
Viresh Kumar32439ac2021-01-28 12:05:22 +05302065 opp_table = _add_opp_table(dev, false);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02002066 if (IS_ERR(opp_table))
2067 return opp_table;
Viresh Kumar829a4e82017-06-21 10:29:13 +05302068
2069 /* This should be called before OPPs are initialized */
2070 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
2071 ret = -EBUSY;
2072 goto err;
2073 }
2074
Viresh Kumar32439ac2021-01-28 12:05:22 +05302075 /* clk shouldn't be initialized at this point */
2076 if (WARN_ON(opp_table->clk)) {
2077 ret = -EBUSY;
2078 goto err;
2079 }
Viresh Kumar829a4e82017-06-21 10:29:13 +05302080
2081 /* Find clk for the device */
2082 opp_table->clk = clk_get(dev, name);
2083 if (IS_ERR(opp_table->clk)) {
2084 ret = PTR_ERR(opp_table->clk);
2085 if (ret != -EPROBE_DEFER) {
2086 dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
2087 ret);
2088 }
2089 goto err;
2090 }
2091
2092 return opp_table;
2093
2094err:
2095 dev_pm_opp_put_opp_table(opp_table);
2096
2097 return ERR_PTR(ret);
2098}
2099EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
2100
2101/**
2102 * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
2103 * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
2104 */
2105void dev_pm_opp_put_clkname(struct opp_table *opp_table)
2106{
Viresh Kumarc7bf8752020-11-06 12:16:52 +05302107 if (unlikely(!opp_table))
2108 return;
2109
Viresh Kumar829a4e82017-06-21 10:29:13 +05302110 /* Make sure there are no concurrent readers while updating opp_table */
2111 WARN_ON(!list_empty(&opp_table->opp_list));
2112
2113 clk_put(opp_table->clk);
2114 opp_table->clk = ERR_PTR(-EINVAL);
2115
2116 dev_pm_opp_put_opp_table(opp_table);
2117}
2118EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
2119
2120/**
Viresh Kumar4dab1602016-12-01 16:28:21 +05302121 * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
2122 * @dev: Device for which the helper is getting registered.
2123 * @set_opp: Custom set OPP helper.
2124 *
2125 * This is useful to support complex platforms (like platforms with multiple
2126 * regulators per device), instead of the generic OPP set rate helper.
2127 *
2128 * This must be called before any OPPs are initialized for the device.
Viresh Kumar4dab1602016-12-01 16:28:21 +05302129 */
Viresh Kumarfa301842017-01-23 10:11:43 +05302130struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
Viresh Kumar4dab1602016-12-01 16:28:21 +05302131 int (*set_opp)(struct dev_pm_set_opp_data *data))
2132{
Viresh Kumar38bb3432021-01-19 11:58:58 +05302133 struct dev_pm_set_opp_data *data;
Viresh Kumar4dab1602016-12-01 16:28:21 +05302134 struct opp_table *opp_table;
Viresh Kumar4dab1602016-12-01 16:28:21 +05302135
2136 if (!set_opp)
Viresh Kumarfa301842017-01-23 10:11:43 +05302137 return ERR_PTR(-EINVAL);
Viresh Kumar4dab1602016-12-01 16:28:21 +05302138
Viresh Kumar32439ac2021-01-28 12:05:22 +05302139 opp_table = _add_opp_table(dev, false);
Viresh Kumar47efcbc2020-10-20 16:03:15 +05302140 if (IS_ERR(opp_table))
Stephan Gerholddd461cd2020-07-27 11:30:46 +02002141 return opp_table;
Viresh Kumar4dab1602016-12-01 16:28:21 +05302142
2143 /* This should be called before OPPs are initialized */
2144 if (WARN_ON(!list_empty(&opp_table->opp_list))) {
Viresh Kumar5019acc2018-05-22 16:38:08 +05302145 dev_pm_opp_put_opp_table(opp_table);
2146 return ERR_PTR(-EBUSY);
Viresh Kumar4dab1602016-12-01 16:28:21 +05302147 }
2148
Viresh Kumar5019acc2018-05-22 16:38:08 +05302149 /* Another CPU that shares the OPP table has set the helper ? */
Viresh Kumar38bb3432021-01-19 11:58:58 +05302150 if (opp_table->set_opp)
2151 return opp_table;
2152
2153 data = kzalloc(sizeof(*data), GFP_KERNEL);
2154 if (!data)
2155 return ERR_PTR(-ENOMEM);
2156
2157 mutex_lock(&opp_table->lock);
2158 opp_table->set_opp_data = data;
2159 if (opp_table->sod_supplies) {
2160 data->old_opp.supplies = opp_table->sod_supplies;
2161 data->new_opp.supplies = opp_table->sod_supplies +
2162 opp_table->regulator_count;
2163 }
2164 mutex_unlock(&opp_table->lock);
2165
2166 opp_table->set_opp = set_opp;
Viresh Kumar4dab1602016-12-01 16:28:21 +05302167
Viresh Kumarfa301842017-01-23 10:11:43 +05302168 return opp_table;
Viresh Kumar4dab1602016-12-01 16:28:21 +05302169}
2170EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
2171
2172/**
Viresh Kumar604a7ae2017-10-05 17:26:21 +05302173 * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for
Viresh Kumar4dab1602016-12-01 16:28:21 +05302174 * set_opp helper
Viresh Kumarfa301842017-01-23 10:11:43 +05302175 * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
Viresh Kumar4dab1602016-12-01 16:28:21 +05302176 *
Viresh Kumarfa301842017-01-23 10:11:43 +05302177 * Release resources blocked for platform specific set_opp helper.
Viresh Kumar4dab1602016-12-01 16:28:21 +05302178 */
Viresh Kumar604a7ae2017-10-05 17:26:21 +05302179void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
Viresh Kumar4dab1602016-12-01 16:28:21 +05302180{
Viresh Kumarc7bf8752020-11-06 12:16:52 +05302181 if (unlikely(!opp_table))
2182 return;
2183
Viresh Kumar4dab1602016-12-01 16:28:21 +05302184 /* Make sure there are no concurrent readers while updating opp_table */
2185 WARN_ON(!list_empty(&opp_table->opp_list));
2186
2187 opp_table->set_opp = NULL;
Viresh Kumar38bb3432021-01-19 11:58:58 +05302188
2189 mutex_lock(&opp_table->lock);
2190 kfree(opp_table->set_opp_data);
2191 opp_table->set_opp_data = NULL;
2192 mutex_unlock(&opp_table->lock);
2193
Viresh Kumarfa301842017-01-23 10:11:43 +05302194 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar4dab1602016-12-01 16:28:21 +05302195}
Viresh Kumar604a7ae2017-10-05 17:26:21 +05302196EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
Viresh Kumar4dab1602016-12-01 16:28:21 +05302197
Dmitry Osipenkoa3c47af2021-01-18 03:55:20 +03002198static void devm_pm_opp_unregister_set_opp_helper(void *data)
2199{
2200 dev_pm_opp_unregister_set_opp_helper(data);
2201}
2202
2203/**
2204 * devm_pm_opp_register_set_opp_helper() - Register custom set OPP helper
2205 * @dev: Device for which the helper is getting registered.
2206 * @set_opp: Custom set OPP helper.
2207 *
2208 * This is a resource-managed version of dev_pm_opp_register_set_opp_helper().
2209 *
2210 * Return: pointer to 'struct opp_table' on success and errorno otherwise.
2211 */
2212struct opp_table *
2213devm_pm_opp_register_set_opp_helper(struct device *dev,
2214 int (*set_opp)(struct dev_pm_set_opp_data *data))
2215{
2216 struct opp_table *opp_table;
2217 int err;
2218
2219 opp_table = dev_pm_opp_register_set_opp_helper(dev, set_opp);
2220 if (IS_ERR(opp_table))
2221 return opp_table;
2222
2223 err = devm_add_action_or_reset(dev, devm_pm_opp_unregister_set_opp_helper,
2224 opp_table);
2225 if (err)
2226 return ERR_PTR(err);
2227
2228 return opp_table;
2229}
2230EXPORT_SYMBOL_GPL(devm_pm_opp_register_set_opp_helper);
2231
Viresh Kumar6319aee2019-05-08 15:19:13 +05302232static void _opp_detach_genpd(struct opp_table *opp_table)
2233{
2234 int index;
2235
Viresh Kumarcb60e962020-08-31 11:22:37 +05302236 if (!opp_table->genpd_virt_devs)
2237 return;
2238
Viresh Kumar6319aee2019-05-08 15:19:13 +05302239 for (index = 0; index < opp_table->required_opp_count; index++) {
2240 if (!opp_table->genpd_virt_devs[index])
2241 continue;
2242
2243 dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
2244 opp_table->genpd_virt_devs[index] = NULL;
2245 }
Viresh Kumarc0ab9e02019-05-08 15:43:36 +05302246
2247 kfree(opp_table->genpd_virt_devs);
2248 opp_table->genpd_virt_devs = NULL;
Viresh Kumar6319aee2019-05-08 15:19:13 +05302249}
2250
Viresh Kumar4dab1602016-12-01 16:28:21 +05302251/**
Viresh Kumar6319aee2019-05-08 15:19:13 +05302252 * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
2253 * @dev: Consumer device for which the genpd is getting attached.
2254 * @names: Null terminated array of pointers containing names of genpd to attach.
Viresh Kumar17a8f862019-07-08 11:24:56 +05302255 * @virt_devs: Pointer to return the array of virtual devices.
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302256 *
2257 * Multiple generic power domains for a device are supported with the help of
2258 * virtual genpd devices, which are created for each consumer device - genpd
2259 * pair. These are the device structures which are attached to the power domain
2260 * and are required by the OPP core to set the performance state of the genpd.
Viresh Kumar6319aee2019-05-08 15:19:13 +05302261 * The same API also works for the case where single genpd is available and so
2262 * we don't need to support that separately.
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302263 *
2264 * This helper will normally be called by the consumer driver of the device
Viresh Kumar6319aee2019-05-08 15:19:13 +05302265 * "dev", as only that has details of the genpd names.
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302266 *
Viresh Kumar6319aee2019-05-08 15:19:13 +05302267 * This helper needs to be called once with a list of all genpd to attach.
2268 * Otherwise the original device structure will be used instead by the OPP core.
Viresh Kumarbaea35e2019-07-17 11:20:17 +05302269 *
2270 * The order of entries in the names array must match the order in which
2271 * "required-opps" are added in DT.
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302272 */
Viresh Kumar17a8f862019-07-08 11:24:56 +05302273struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
2274 const char **names, struct device ***virt_devs)
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302275{
2276 struct opp_table *opp_table;
Viresh Kumar6319aee2019-05-08 15:19:13 +05302277 struct device *virt_dev;
Viresh Kumarbaea35e2019-07-17 11:20:17 +05302278 int index = 0, ret = -EINVAL;
Viresh Kumar6319aee2019-05-08 15:19:13 +05302279 const char **name = names;
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302280
Viresh Kumar32439ac2021-01-28 12:05:22 +05302281 opp_table = _add_opp_table(dev, false);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02002282 if (IS_ERR(opp_table))
2283 return opp_table;
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302284
Viresh Kumarcb60e962020-08-31 11:22:37 +05302285 if (opp_table->genpd_virt_devs)
2286 return opp_table;
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302287
Viresh Kumar6319aee2019-05-08 15:19:13 +05302288 /*
2289 * If the genpd's OPP table isn't already initialized, parsing of the
2290 * required-opps fail for dev. We should retry this after genpd's OPP
2291 * table is added.
2292 */
2293 if (!opp_table->required_opp_count) {
2294 ret = -EPROBE_DEFER;
2295 goto put_table;
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302296 }
2297
Viresh Kumar6319aee2019-05-08 15:19:13 +05302298 mutex_lock(&opp_table->genpd_virt_dev_lock);
2299
Viresh Kumarc0ab9e02019-05-08 15:43:36 +05302300 opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
2301 sizeof(*opp_table->genpd_virt_devs),
2302 GFP_KERNEL);
2303 if (!opp_table->genpd_virt_devs)
2304 goto unlock;
2305
Viresh Kumar6319aee2019-05-08 15:19:13 +05302306 while (*name) {
Viresh Kumar6319aee2019-05-08 15:19:13 +05302307 if (index >= opp_table->required_opp_count) {
2308 dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
2309 *name, opp_table->required_opp_count, index);
2310 goto err;
2311 }
2312
Viresh Kumar6319aee2019-05-08 15:19:13 +05302313 virt_dev = dev_pm_domain_attach_by_name(dev, *name);
2314 if (IS_ERR(virt_dev)) {
2315 ret = PTR_ERR(virt_dev);
2316 dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
2317 goto err;
2318 }
2319
2320 opp_table->genpd_virt_devs[index] = virt_dev;
Viresh Kumarbaea35e2019-07-17 11:20:17 +05302321 index++;
Viresh Kumar6319aee2019-05-08 15:19:13 +05302322 name++;
2323 }
2324
Viresh Kumar17a8f862019-07-08 11:24:56 +05302325 if (virt_devs)
2326 *virt_devs = opp_table->genpd_virt_devs;
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302327 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2328
2329 return opp_table;
Viresh Kumar6319aee2019-05-08 15:19:13 +05302330
2331err:
2332 _opp_detach_genpd(opp_table);
Viresh Kumarc0ab9e02019-05-08 15:43:36 +05302333unlock:
Viresh Kumar6319aee2019-05-08 15:19:13 +05302334 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2335
2336put_table:
2337 dev_pm_opp_put_opp_table(opp_table);
2338
2339 return ERR_PTR(ret);
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302340}
Viresh Kumar6319aee2019-05-08 15:19:13 +05302341EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd);
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302342
2343/**
Viresh Kumar6319aee2019-05-08 15:19:13 +05302344 * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device.
2345 * @opp_table: OPP table returned by dev_pm_opp_attach_genpd().
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302346 *
Viresh Kumar6319aee2019-05-08 15:19:13 +05302347 * This detaches the genpd(s), resets the virtual device pointers, and puts the
2348 * OPP table.
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302349 */
Viresh Kumar6319aee2019-05-08 15:19:13 +05302350void dev_pm_opp_detach_genpd(struct opp_table *opp_table)
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302351{
Viresh Kumarc7bf8752020-11-06 12:16:52 +05302352 if (unlikely(!opp_table))
2353 return;
2354
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302355 /*
2356 * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
2357 * used in parallel.
2358 */
2359 mutex_lock(&opp_table->genpd_virt_dev_lock);
Viresh Kumar6319aee2019-05-08 15:19:13 +05302360 _opp_detach_genpd(opp_table);
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302361 mutex_unlock(&opp_table->genpd_virt_dev_lock);
2362
Viresh Kumar6319aee2019-05-08 15:19:13 +05302363 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302364}
Viresh Kumar6319aee2019-05-08 15:19:13 +05302365EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd);
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302366
Dmitry Osipenkob4b9e222021-01-18 03:55:21 +03002367static void devm_pm_opp_detach_genpd(void *data)
2368{
2369 dev_pm_opp_detach_genpd(data);
2370}
2371
2372/**
2373 * devm_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual
2374 * device pointer
2375 * @dev: Consumer device for which the genpd is getting attached.
2376 * @names: Null terminated array of pointers containing names of genpd to attach.
2377 * @virt_devs: Pointer to return the array of virtual devices.
2378 *
2379 * This is a resource-managed version of dev_pm_opp_attach_genpd().
2380 *
2381 * Return: pointer to 'struct opp_table' on success and errorno otherwise.
2382 */
2383struct opp_table *
2384devm_pm_opp_attach_genpd(struct device *dev, const char **names,
2385 struct device ***virt_devs)
2386{
2387 struct opp_table *opp_table;
2388 int err;
2389
2390 opp_table = dev_pm_opp_attach_genpd(dev, names, virt_devs);
2391 if (IS_ERR(opp_table))
2392 return opp_table;
2393
2394 err = devm_add_action_or_reset(dev, devm_pm_opp_detach_genpd,
2395 opp_table);
2396 if (err)
2397 return ERR_PTR(err);
2398
2399 return opp_table;
2400}
2401EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd);
2402
Viresh Kumar4f018bc2018-06-26 16:29:34 +05302403/**
Saravana Kannan7d8658ef2021-02-04 16:14:22 +08002404 * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP.
2405 * @src_table: OPP table which has @dst_table as one of its required OPP table.
2406 * @dst_table: Required OPP table of the @src_table.
2407 * @src_opp: OPP from the @src_table.
2408 *
2409 * This function returns the OPP (present in @dst_table) pointed out by the
2410 * "required-opps" property of the @src_opp (present in @src_table).
2411 *
2412 * The callers are required to call dev_pm_opp_put() for the returned OPP after
2413 * use.
2414 *
2415 * Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise.
2416 */
2417struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
2418 struct opp_table *dst_table,
2419 struct dev_pm_opp *src_opp)
2420{
2421 struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV);
2422 int i;
2423
2424 if (!src_table || !dst_table || !src_opp ||
2425 !src_table->required_opp_tables)
2426 return ERR_PTR(-EINVAL);
2427
2428 /* required-opps not fully initialized yet */
2429 if (lazy_linking_pending(src_table))
2430 return ERR_PTR(-EBUSY);
2431
2432 for (i = 0; i < src_table->required_opp_count; i++) {
2433 if (src_table->required_opp_tables[i] == dst_table) {
2434 mutex_lock(&src_table->lock);
2435
2436 list_for_each_entry(opp, &src_table->opp_list, node) {
2437 if (opp == src_opp) {
2438 dest_opp = opp->required_opps[i];
2439 dev_pm_opp_get(dest_opp);
2440 break;
2441 }
2442 }
2443
2444 mutex_unlock(&src_table->lock);
2445 break;
2446 }
2447 }
2448
2449 if (IS_ERR(dest_opp)) {
2450 pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__,
2451 src_table, dst_table);
2452 }
2453
2454 return dest_opp;
2455}
2456EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp);
2457
2458/**
Viresh Kumarc8a59102018-11-02 14:36:42 +05302459 * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
2460 * @src_table: OPP table which has dst_table as one of its required OPP table.
2461 * @dst_table: Required OPP table of the src_table.
2462 * @pstate: Current performance state of the src_table.
2463 *
2464 * This Returns pstate of the OPP (present in @dst_table) pointed out by the
2465 * "required-opps" property of the OPP (present in @src_table) which has
2466 * performance state set to @pstate.
2467 *
2468 * Return: Zero or positive performance state on success, otherwise negative
2469 * value on errors.
2470 */
2471int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
2472 struct opp_table *dst_table,
2473 unsigned int pstate)
2474{
2475 struct dev_pm_opp *opp;
2476 int dest_pstate = -EINVAL;
2477 int i;
2478
Viresh Kumarc8a59102018-11-02 14:36:42 +05302479 /*
2480 * Normally the src_table will have the "required_opps" property set to
2481 * point to one of the OPPs in the dst_table, but in some cases the
2482 * genpd and its master have one to one mapping of performance states
2483 * and so none of them have the "required-opps" property set. Return the
2484 * pstate of the src_table as it is in such cases.
2485 */
Dmitry Osipenkof2f4d2b2021-01-18 03:55:23 +03002486 if (!src_table || !src_table->required_opp_count)
Viresh Kumarc8a59102018-11-02 14:36:42 +05302487 return pstate;
2488
Viresh Kumar7eba0c72019-11-25 13:57:58 +05302489 /* required-opps not fully initialized yet */
2490 if (lazy_linking_pending(src_table))
2491 return -EBUSY;
2492
Viresh Kumarc8a59102018-11-02 14:36:42 +05302493 for (i = 0; i < src_table->required_opp_count; i++) {
2494 if (src_table->required_opp_tables[i]->np == dst_table->np)
2495 break;
2496 }
2497
2498 if (unlikely(i == src_table->required_opp_count)) {
2499 pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
2500 __func__, src_table, dst_table);
2501 return -EINVAL;
2502 }
2503
2504 mutex_lock(&src_table->lock);
2505
2506 list_for_each_entry(opp, &src_table->opp_list, node) {
2507 if (opp->pstate == pstate) {
2508 dest_pstate = opp->required_opps[i]->pstate;
2509 goto unlock;
2510 }
2511 }
2512
2513 pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
2514 dst_table);
2515
2516unlock:
2517 mutex_unlock(&src_table->lock);
2518
2519 return dest_pstate;
2520}
2521
2522/**
Nishanth Menone1f60b22010-10-13 00:13:10 +02002523 * dev_pm_opp_add() - Add an OPP table from a table definitions
2524 * @dev: device for which we do this operation
Nishanth Menon47d43ba2013-09-19 16:03:51 -05002525 * @freq: Frequency in Hz for this OPP
Nishanth Menone1f60b22010-10-13 00:13:10 +02002526 * @u_volt: Voltage in uVolts for this OPP
2527 *
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302528 * This function adds an opp definition to the opp table and returns status.
Nishanth Menon47d43ba2013-09-19 16:03:51 -05002529 * The opp is made available by default and it can be controlled using
Nishanth Menone1f60b22010-10-13 00:13:10 +02002530 * dev_pm_opp_enable/disable functions.
2531 *
Viresh Kumara7470db2014-11-25 16:04:17 +05302532 * Return:
2533 * 0 On success OR
2534 * Duplicate OPPs (both freq and volt are same) and opp->available
2535 * -EEXIST Freq are same and volt are different OR
2536 * Duplicate OPPs (both freq and volt are same) and !opp->available
Viresh Kumar383934092014-11-25 16:04:18 +05302537 * -ENOMEM Memory allocation failure
Viresh Kumara7470db2014-11-25 16:04:17 +05302538 */
Nishanth Menone1f60b22010-10-13 00:13:10 +02002539int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
2540{
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05302541 struct opp_table *opp_table;
2542 int ret;
2543
Viresh Kumar32439ac2021-01-28 12:05:22 +05302544 opp_table = _add_opp_table(dev, true);
Stephan Gerholddd461cd2020-07-27 11:30:46 +02002545 if (IS_ERR(opp_table))
2546 return PTR_ERR(opp_table);
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05302547
Viresh Kumar46f48ac2018-12-11 16:39:36 +05302548 /* Fix regulator count for dynamic OPPs */
2549 opp_table->regulator_count = 1;
2550
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05302551 ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
Viresh Kumar0ad8c622018-08-02 14:23:09 +05302552 if (ret)
2553 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05302554
Viresh Kumar8cd2f6e2017-01-02 14:41:01 +05302555 return ret;
Nishanth Menone1f60b22010-10-13 00:13:10 +02002556}
2557EXPORT_SYMBOL_GPL(dev_pm_opp_add);
2558
Nishanth Menone1f60b22010-10-13 00:13:10 +02002559/**
Nishanth Menon327854c2014-12-24 11:22:56 -06002560 * _opp_set_availability() - helper to set the availability of an opp
Nishanth Menone1f60b22010-10-13 00:13:10 +02002561 * @dev: device for which we do this operation
2562 * @freq: OPP frequency to modify availability
2563 * @availability_req: availability status requested for this opp
2564 *
Viresh Kumar052c6f12017-01-23 10:11:49 +05302565 * Set the availability of an OPP, opp_{enable,disable} share a common logic
2566 * which is isolated here.
Nishanth Menone1f60b22010-10-13 00:13:10 +02002567 *
Nishanth Menon984f16c82014-12-24 11:22:57 -06002568 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
Stephen Boyde1a2d492015-09-24 12:28:44 -07002569 * copy operation, returns 0 if no modification was done OR modification was
Nishanth Menone1f60b22010-10-13 00:13:10 +02002570 * successful.
Nishanth Menone1f60b22010-10-13 00:13:10 +02002571 */
Nishanth Menon327854c2014-12-24 11:22:56 -06002572static int _opp_set_availability(struct device *dev, unsigned long freq,
2573 bool availability_req)
Nishanth Menone1f60b22010-10-13 00:13:10 +02002574{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302575 struct opp_table *opp_table;
Viresh Kumara7f39872017-01-23 10:11:50 +05302576 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002577 int r = 0;
2578
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302579 /* Find the opp_table */
2580 opp_table = _find_opp_table(dev);
2581 if (IS_ERR(opp_table)) {
2582 r = PTR_ERR(opp_table);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002583 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
Viresh Kumara7f39872017-01-23 10:11:50 +05302584 return r;
Nishanth Menone1f60b22010-10-13 00:13:10 +02002585 }
2586
Viresh Kumar37a73ec2017-01-23 10:11:41 +05302587 mutex_lock(&opp_table->lock);
2588
Nishanth Menone1f60b22010-10-13 00:13:10 +02002589 /* Do we have the frequency? */
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302590 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
Nishanth Menone1f60b22010-10-13 00:13:10 +02002591 if (tmp_opp->rate == freq) {
2592 opp = tmp_opp;
2593 break;
2594 }
2595 }
Viresh Kumar37a73ec2017-01-23 10:11:41 +05302596
Nishanth Menone1f60b22010-10-13 00:13:10 +02002597 if (IS_ERR(opp)) {
2598 r = PTR_ERR(opp);
2599 goto unlock;
2600 }
2601
2602 /* Is update really needed? */
2603 if (opp->available == availability_req)
2604 goto unlock;
Nishanth Menone1f60b22010-10-13 00:13:10 +02002605
Viresh Kumara7f39872017-01-23 10:11:50 +05302606 opp->available = availability_req;
Nishanth Menone1f60b22010-10-13 00:13:10 +02002607
Viresh Kumare4d8ae02017-09-21 10:44:36 -07002608 dev_pm_opp_get(opp);
2609 mutex_unlock(&opp_table->lock);
2610
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002611 /* Notify the change of the OPP availability */
2612 if (availability_req)
Viresh Kumar052c6f12017-01-23 10:11:49 +05302613 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
Viresh Kumara7f39872017-01-23 10:11:50 +05302614 opp);
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002615 else
Viresh Kumar052c6f12017-01-23 10:11:49 +05302616 blocking_notifier_call_chain(&opp_table->head,
Viresh Kumara7f39872017-01-23 10:11:50 +05302617 OPP_EVENT_DISABLE, opp);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002618
Viresh Kumare4d8ae02017-09-21 10:44:36 -07002619 dev_pm_opp_put(opp);
2620 goto put_table;
2621
Nishanth Menone1f60b22010-10-13 00:13:10 +02002622unlock:
Viresh Kumar5b650b32017-01-23 10:11:48 +05302623 mutex_unlock(&opp_table->lock);
Viresh Kumare4d8ae02017-09-21 10:44:36 -07002624put_table:
Viresh Kumar5b650b32017-01-23 10:11:48 +05302625 dev_pm_opp_put_opp_table(opp_table);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002626 return r;
2627}
2628
2629/**
Stephen Boyd25cb20a2019-10-16 16:57:53 +02002630 * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP
2631 * @dev: device for which we do this operation
2632 * @freq: OPP frequency to adjust voltage of
2633 * @u_volt: new OPP target voltage
2634 * @u_volt_min: new OPP min voltage
2635 * @u_volt_max: new OPP max voltage
2636 *
2637 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
2638 * copy operation, returns 0 if no modifcation was done OR modification was
2639 * successful.
2640 */
2641int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
2642 unsigned long u_volt, unsigned long u_volt_min,
2643 unsigned long u_volt_max)
2644
2645{
2646 struct opp_table *opp_table;
2647 struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
2648 int r = 0;
2649
2650 /* Find the opp_table */
2651 opp_table = _find_opp_table(dev);
2652 if (IS_ERR(opp_table)) {
2653 r = PTR_ERR(opp_table);
2654 dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
2655 return r;
2656 }
2657
2658 mutex_lock(&opp_table->lock);
2659
2660 /* Do we have the frequency? */
2661 list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
2662 if (tmp_opp->rate == freq) {
2663 opp = tmp_opp;
2664 break;
2665 }
2666 }
2667
2668 if (IS_ERR(opp)) {
2669 r = PTR_ERR(opp);
2670 goto adjust_unlock;
2671 }
2672
2673 /* Is update really needed? */
2674 if (opp->supplies->u_volt == u_volt)
2675 goto adjust_unlock;
2676
2677 opp->supplies->u_volt = u_volt;
2678 opp->supplies->u_volt_min = u_volt_min;
2679 opp->supplies->u_volt_max = u_volt_max;
2680
2681 dev_pm_opp_get(opp);
2682 mutex_unlock(&opp_table->lock);
2683
2684 /* Notify the voltage change of the OPP */
2685 blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE,
2686 opp);
2687
2688 dev_pm_opp_put(opp);
2689 goto adjust_put_table;
2690
2691adjust_unlock:
2692 mutex_unlock(&opp_table->lock);
2693adjust_put_table:
2694 dev_pm_opp_put_opp_table(opp_table);
2695 return r;
2696}
Valdis Klētnieks03649152020-06-20 13:03:22 -04002697EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);
Stephen Boyd25cb20a2019-10-16 16:57:53 +02002698
2699/**
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002700 * dev_pm_opp_enable() - Enable a specific OPP
Nishanth Menone1f60b22010-10-13 00:13:10 +02002701 * @dev: device for which we do this operation
2702 * @freq: OPP frequency to enable
2703 *
2704 * Enables a provided opp. If the operation is valid, this returns 0, else the
2705 * corresponding error value. It is meant to be used for users an OPP available
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002706 * after being temporarily made unavailable with dev_pm_opp_disable.
Nishanth Menone1f60b22010-10-13 00:13:10 +02002707 *
Nishanth Menon984f16c82014-12-24 11:22:57 -06002708 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
Stephen Boyde1a2d492015-09-24 12:28:44 -07002709 * copy operation, returns 0 if no modification was done OR modification was
Nishanth Menon984f16c82014-12-24 11:22:57 -06002710 * successful.
Nishanth Menone1f60b22010-10-13 00:13:10 +02002711 */
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002712int dev_pm_opp_enable(struct device *dev, unsigned long freq)
Nishanth Menone1f60b22010-10-13 00:13:10 +02002713{
Nishanth Menon327854c2014-12-24 11:22:56 -06002714 return _opp_set_availability(dev, freq, true);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002715}
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002716EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002717
2718/**
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002719 * dev_pm_opp_disable() - Disable a specific OPP
Nishanth Menone1f60b22010-10-13 00:13:10 +02002720 * @dev: device for which we do this operation
2721 * @freq: OPP frequency to disable
2722 *
2723 * Disables a provided opp. If the operation is valid, this returns
2724 * 0, else the corresponding error value. It is meant to be a temporary
2725 * control by users to make this OPP not available until the circumstances are
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002726 * right to make it available again (with a call to dev_pm_opp_enable).
Nishanth Menone1f60b22010-10-13 00:13:10 +02002727 *
Nishanth Menon984f16c82014-12-24 11:22:57 -06002728 * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
Stephen Boyde1a2d492015-09-24 12:28:44 -07002729 * copy operation, returns 0 if no modification was done OR modification was
Nishanth Menon984f16c82014-12-24 11:22:57 -06002730 * successful.
Nishanth Menone1f60b22010-10-13 00:13:10 +02002731 */
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002732int dev_pm_opp_disable(struct device *dev, unsigned long freq)
Nishanth Menone1f60b22010-10-13 00:13:10 +02002733{
Nishanth Menon327854c2014-12-24 11:22:56 -06002734 return _opp_set_availability(dev, freq, false);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002735}
Nishanth Menon5d4879c2013-09-19 16:03:50 -05002736EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
Nishanth Menone1f60b22010-10-13 00:13:10 +02002737
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002738/**
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302739 * dev_pm_opp_register_notifier() - Register OPP notifier for the device
2740 * @dev: Device for which notifier needs to be registered
2741 * @nb: Notifier block to be registered
Nishanth Menon984f16c82014-12-24 11:22:57 -06002742 *
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302743 * Return: 0 on success or a negative error value.
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002744 */
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302745int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002746{
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302747 struct opp_table *opp_table;
2748 int ret;
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002749
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302750 opp_table = _find_opp_table(dev);
Viresh Kumar5b650b32017-01-23 10:11:48 +05302751 if (IS_ERR(opp_table))
2752 return PTR_ERR(opp_table);
2753
Viresh Kumar052c6f12017-01-23 10:11:49 +05302754 ret = blocking_notifier_chain_register(&opp_table->head, nb);
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302755
Viresh Kumar5b650b32017-01-23 10:11:48 +05302756 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302757
2758 return ret;
MyungJoo Ham03ca3702011-09-30 22:35:12 +02002759}
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302760EXPORT_SYMBOL(dev_pm_opp_register_notifier);
2761
2762/**
2763 * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
2764 * @dev: Device for which notifier needs to be unregistered
2765 * @nb: Notifier block to be unregistered
2766 *
2767 * Return: 0 on success or a negative error value.
2768 */
2769int dev_pm_opp_unregister_notifier(struct device *dev,
2770 struct notifier_block *nb)
2771{
2772 struct opp_table *opp_table;
2773 int ret;
2774
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302775 opp_table = _find_opp_table(dev);
Viresh Kumar5b650b32017-01-23 10:11:48 +05302776 if (IS_ERR(opp_table))
2777 return PTR_ERR(opp_table);
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302778
Viresh Kumar052c6f12017-01-23 10:11:49 +05302779 ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302780
Viresh Kumar5b650b32017-01-23 10:11:48 +05302781 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumardc2c9ad2017-01-02 14:41:03 +05302782
2783 return ret;
2784}
2785EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
Shawn Guob496dfb2012-09-05 01:09:12 +02002786
Viresh Kumar8aaf6262020-08-20 13:18:23 +05302787/**
2788 * dev_pm_opp_remove_table() - Free all OPPs associated with the device
2789 * @dev: device pointer used to lookup OPP table.
2790 *
2791 * Free both OPPs created using static entries present in DT and the
2792 * dynamically added entries.
2793 */
2794void dev_pm_opp_remove_table(struct device *dev)
Viresh Kumar737002b2015-07-29 16:22:58 +05302795{
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302796 struct opp_table *opp_table;
Viresh Kumar737002b2015-07-29 16:22:58 +05302797
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302798 /* Check for existing table for 'dev' */
2799 opp_table = _find_opp_table(dev);
2800 if (IS_ERR(opp_table)) {
2801 int error = PTR_ERR(opp_table);
Viresh Kumar737002b2015-07-29 16:22:58 +05302802
2803 if (error != -ENODEV)
Viresh Kumar2c2709d2016-02-16 14:17:53 +05302804 WARN(1, "%s: opp_table: %d\n",
Viresh Kumar737002b2015-07-29 16:22:58 +05302805 IS_ERR_OR_NULL(dev) ?
2806 "Invalid device" : dev_name(dev),
2807 error);
Viresh Kumar5b650b32017-01-23 10:11:48 +05302808 return;
Viresh Kumar737002b2015-07-29 16:22:58 +05302809 }
2810
Viresh Kumar922ff072020-08-31 13:03:06 +05302811 /*
2812 * Drop the extra reference only if the OPP table was successfully added
2813 * with dev_pm_opp_of_add_table() earlier.
2814 **/
2815 if (_opp_remove_all_static(opp_table))
2816 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar737002b2015-07-29 16:22:58 +05302817
Viresh Kumarcdd6ed92018-09-12 12:35:19 +05302818 /* Drop reference taken by _find_opp_table() */
2819 dev_pm_opp_put_opp_table(opp_table);
Viresh Kumar737002b2015-07-29 16:22:58 +05302820}
Sudeep Holla411466c2016-05-03 15:05:04 +01002821EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
Dmitry Osipenkoce8073d2021-01-21 01:26:47 +03002822
2823/**
2824 * dev_pm_opp_sync_regulators() - Sync state of voltage regulators
2825 * @dev: device for which we do this operation
2826 *
2827 * Sync voltage state of the OPP table regulators.
2828 *
2829 * Return: 0 on success or a negative error value.
2830 */
2831int dev_pm_opp_sync_regulators(struct device *dev)
2832{
2833 struct opp_table *opp_table;
2834 struct regulator *reg;
2835 int i, ret = 0;
2836
2837 /* Device may not have OPP table */
2838 opp_table = _find_opp_table(dev);
2839 if (IS_ERR(opp_table))
2840 return 0;
2841
2842 /* Regulator may not be required for the device */
2843 if (unlikely(!opp_table->regulators))
2844 goto put_table;
2845
2846 /* Nothing to sync if voltage wasn't changed */
2847 if (!opp_table->enabled)
2848 goto put_table;
2849
2850 for (i = 0; i < opp_table->regulator_count; i++) {
2851 reg = opp_table->regulators[i];
2852 ret = regulator_sync_voltage(reg);
2853 if (ret)
2854 break;
2855 }
2856put_table:
2857 /* Drop reference taken by _find_opp_table() */
2858 dev_pm_opp_put_opp_table(opp_table);
2859
2860 return ret;
2861}
2862EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);