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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Generic OPP Interface
- *
- * Copyright (C) 2009-2010 Texas Instruments Incorporated.
- * Nishanth Menon
- * Romit Dasgupta
- * Kevin Hilman
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/clk.h>
- #include <linux/errno.h>
- #include <linux/err.h>
- #include <linux/slab.h>
- #include <linux/device.h>
- #include <linux/export.h>
- #include <linux/pm_domain.h>
- #include <linux/regulator/consumer.h>
- #include "opp.h"
- /*
- * The root of the list of all opp-tables. All opp_table structures branch off
- * from here, with each opp_table containing the list of opps it supports in
- * various states of availability.
- */
- LIST_HEAD(opp_tables);
- /* Lock to allow exclusive modification to the device and opp lists */
- DEFINE_MUTEX(opp_table_lock);
- static struct opp_device *_find_opp_dev(const struct device *dev,
- struct opp_table *opp_table)
- {
- struct opp_device *opp_dev;
- list_for_each_entry(opp_dev, &opp_table->dev_list, node)
- if (opp_dev->dev == dev)
- return opp_dev;
- return NULL;
- }
- static struct opp_table *_find_opp_table_unlocked(struct device *dev)
- {
- struct opp_table *opp_table;
- bool found;
- list_for_each_entry(opp_table, &opp_tables, node) {
- mutex_lock(&opp_table->lock);
- found = !!_find_opp_dev(dev, opp_table);
- mutex_unlock(&opp_table->lock);
- if (found) {
- _get_opp_table_kref(opp_table);
- return opp_table;
- }
- }
- return ERR_PTR(-ENODEV);
- }
- /**
- * _find_opp_table() - find opp_table struct using device pointer
- * @dev: device pointer used to lookup OPP table
- *
- * Search OPP table for one containing matching device.
- *
- * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
- * -EINVAL based on type of error.
- *
- * The callers must call dev_pm_opp_put_opp_table() after the table is used.
- */
- struct opp_table *_find_opp_table(struct device *dev)
- {
- struct opp_table *opp_table;
- if (IS_ERR_OR_NULL(dev)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return ERR_PTR(-EINVAL);
- }
- mutex_lock(&opp_table_lock);
- opp_table = _find_opp_table_unlocked(dev);
- mutex_unlock(&opp_table_lock);
- return opp_table;
- }
- /**
- * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
- * @opp: opp for which voltage has to be returned for
- *
- * Return: voltage in micro volt corresponding to the opp, else
- * return 0
- *
- * This is useful only for devices with single power supply.
- */
- unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- return opp->supplies[0].u_volt;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
- /**
- * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
- * @opp: opp for which frequency has to be returned for
- *
- * Return: frequency in hertz corresponding to the opp, else
- * return 0
- */
- unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- return opp->rate;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
- /**
- * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
- * @opp: opp for which level value has to be returned for
- *
- * Return: level read from device tree corresponding to the opp, else
- * return 0.
- */
- unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp) || !opp->available) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- return opp->level;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
- /**
- * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
- * @opp: opp for which turbo mode is being verified
- *
- * Turbo OPPs are not for normal use, and can be enabled (under certain
- * conditions) for short duration of times to finish high throughput work
- * quickly. Running on them for longer times may overheat the chip.
- *
- * Return: true if opp is turbo opp, else false.
- */
- bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp) || !opp->available) {
- pr_err("%s: Invalid parameters\n", __func__);
- return false;
- }
- return opp->turbo;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
- /**
- * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
- * @dev: device for which we do this operation
- *
- * Return: This function returns the max clock latency in nanoseconds.
- */
- unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
- {
- struct opp_table *opp_table;
- unsigned long clock_latency_ns;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- clock_latency_ns = opp_table->clock_latency_ns_max;
- dev_pm_opp_put_opp_table(opp_table);
- return clock_latency_ns;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
- /**
- * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
- * @dev: device for which we do this operation
- *
- * Return: This function returns the max voltage latency in nanoseconds.
- */
- unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *opp;
- struct regulator *reg;
- unsigned long latency_ns = 0;
- int ret, i, count;
- struct {
- unsigned long min;
- unsigned long max;
- } *uV;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- /* Regulator may not be required for the device */
- if (!opp_table->regulators)
- goto put_opp_table;
- count = opp_table->regulator_count;
- uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
- if (!uV)
- goto put_opp_table;
- mutex_lock(&opp_table->lock);
- for (i = 0; i < count; i++) {
- uV[i].min = ~0;
- uV[i].max = 0;
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- if (!opp->available)
- continue;
- if (opp->supplies[i].u_volt_min < uV[i].min)
- uV[i].min = opp->supplies[i].u_volt_min;
- if (opp->supplies[i].u_volt_max > uV[i].max)
- uV[i].max = opp->supplies[i].u_volt_max;
- }
- }
- mutex_unlock(&opp_table->lock);
- /*
- * The caller needs to ensure that opp_table (and hence the regulator)
- * isn't freed, while we are executing this routine.
- */
- for (i = 0; i < count; i++) {
- reg = opp_table->regulators[i];
- ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
- if (ret > 0)
- latency_ns += ret * 1000;
- }
- kfree(uV);
- put_opp_table:
- dev_pm_opp_put_opp_table(opp_table);
- return latency_ns;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
- /**
- * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
- * nanoseconds
- * @dev: device for which we do this operation
- *
- * Return: This function returns the max transition latency, in nanoseconds, to
- * switch from one OPP to other.
- */
- unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
- {
- return dev_pm_opp_get_max_volt_latency(dev) +
- dev_pm_opp_get_max_clock_latency(dev);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
- /**
- * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
- * @dev: device for which we do this operation
- *
- * Return: This function returns the frequency of the OPP marked as suspend_opp
- * if one is available, else returns 0;
- */
- unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
- {
- struct opp_table *opp_table;
- unsigned long freq = 0;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- if (opp_table->suspend_opp && opp_table->suspend_opp->available)
- freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
- dev_pm_opp_put_opp_table(opp_table);
- return freq;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
- int _get_opp_count(struct opp_table *opp_table)
- {
- struct dev_pm_opp *opp;
- int count = 0;
- mutex_lock(&opp_table->lock);
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- if (opp->available)
- count++;
- }
- mutex_unlock(&opp_table->lock);
- return count;
- }
- /**
- * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
- * @dev: device for which we do this operation
- *
- * Return: This function returns the number of available opps if there are any,
- * else returns 0 if none or the corresponding error value.
- */
- int dev_pm_opp_get_opp_count(struct device *dev)
- {
- struct opp_table *opp_table;
- int count;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- count = PTR_ERR(opp_table);
- dev_dbg(dev, "%s: OPP table not found (%d)\n",
- __func__, count);
- return count;
- }
- count = _get_opp_count(opp_table);
- dev_pm_opp_put_opp_table(opp_table);
- return count;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
- /**
- * dev_pm_opp_find_freq_exact() - search for an exact frequency
- * @dev: device for which we do this operation
- * @freq: frequency to search for
- * @available: true/false - match for available opp
- *
- * Return: Searches for exact match in the opp table and returns pointer to the
- * matching opp if found, else returns ERR_PTR in case of error and should
- * be handled using IS_ERR. Error return values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * Note: available is a modifier for the search. if available=true, then the
- * match is for exact matching frequency and is available in the stored OPP
- * table. if false, the match is for exact frequency which is not available.
- *
- * This provides a mechanism to enable an opp which is not available currently
- * or the opposite as well.
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
- unsigned long freq,
- bool available)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- int r = PTR_ERR(opp_table);
- dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
- return ERR_PTR(r);
- }
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->available == available &&
- temp_opp->rate == freq) {
- opp = temp_opp;
- /* Increment the reference count of OPP */
- dev_pm_opp_get(opp);
- break;
- }
- }
- mutex_unlock(&opp_table->lock);
- dev_pm_opp_put_opp_table(opp_table);
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
- /**
- * dev_pm_opp_find_level_exact() - search for an exact level
- * @dev: device for which we do this operation
- * @level: level to search for
- *
- * Return: Searches for exact match in the opp table and returns pointer to the
- * matching opp if found, else returns ERR_PTR in case of error and should
- * be handled using IS_ERR. Error return values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
- unsigned int level)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- int r = PTR_ERR(opp_table);
- dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
- return ERR_PTR(r);
- }
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->level == level) {
- opp = temp_opp;
- /* Increment the reference count of OPP */
- dev_pm_opp_get(opp);
- break;
- }
- }
- mutex_unlock(&opp_table->lock);
- dev_pm_opp_put_opp_table(opp_table);
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
- static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
- unsigned long *freq)
- {
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->available && temp_opp->rate >= *freq) {
- opp = temp_opp;
- *freq = opp->rate;
- /* Increment the reference count of OPP */
- dev_pm_opp_get(opp);
- break;
- }
- }
- mutex_unlock(&opp_table->lock);
- return opp;
- }
- /**
- * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
- * @dev: device for which we do this operation
- * @freq: Start frequency
- *
- * Search for the matching ceil *available* OPP from a starting freq
- * for a device.
- *
- * Return: matching *opp and refreshes *freq accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR. Error return
- * values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
- unsigned long *freq)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *opp;
- if (!dev || !freq) {
- dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
- return ERR_PTR(-EINVAL);
- }
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return ERR_CAST(opp_table);
- opp = _find_freq_ceil(opp_table, freq);
- dev_pm_opp_put_opp_table(opp_table);
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
- /**
- * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
- * @dev: device for which we do this operation
- * @freq: Start frequency
- *
- * Search for the matching floor *available* OPP from a starting freq
- * for a device.
- *
- * Return: matching *opp and refreshes *freq accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR. Error return
- * values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
- unsigned long *freq)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
- if (!dev || !freq) {
- dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
- return ERR_PTR(-EINVAL);
- }
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return ERR_CAST(opp_table);
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->available) {
- /* go to the next node, before choosing prev */
- if (temp_opp->rate > *freq)
- break;
- else
- opp = temp_opp;
- }
- }
- /* Increment the reference count of OPP */
- if (!IS_ERR(opp))
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- dev_pm_opp_put_opp_table(opp_table);
- if (!IS_ERR(opp))
- *freq = opp->rate;
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
- /**
- * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
- * target voltage.
- * @dev: Device for which we do this operation.
- * @u_volt: Target voltage.
- *
- * Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
- *
- * Return: matching *opp, else returns ERR_PTR in case of error which should be
- * handled using IS_ERR.
- *
- * Error return values can be:
- * EINVAL: bad parameters
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
- unsigned long u_volt)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
- if (!dev || !u_volt) {
- dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__,
- u_volt);
- return ERR_PTR(-EINVAL);
- }
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return ERR_CAST(opp_table);
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->available) {
- if (temp_opp->supplies[0].u_volt > u_volt)
- break;
- opp = temp_opp;
- }
- }
- /* Increment the reference count of OPP */
- if (!IS_ERR(opp))
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- dev_pm_opp_put_opp_table(opp_table);
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);
- static int _set_opp_voltage(struct device *dev, struct regulator *reg,
- struct dev_pm_opp_supply *supply)
- {
- int ret;
- /* Regulator not available for device */
- if (IS_ERR(reg)) {
- dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
- PTR_ERR(reg));
- return 0;
- }
- dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
- supply->u_volt_min, supply->u_volt, supply->u_volt_max);
- ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
- supply->u_volt, supply->u_volt_max);
- if (ret)
- dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
- __func__, supply->u_volt_min, supply->u_volt,
- supply->u_volt_max, ret);
- return ret;
- }
- static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
- unsigned long freq)
- {
- int ret;
- ret = clk_set_rate(clk, freq);
- if (ret) {
- dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
- ret);
- }
- return ret;
- }
- static int _generic_set_opp_regulator(struct opp_table *opp_table,
- struct device *dev,
- unsigned long old_freq,
- unsigned long freq,
- struct dev_pm_opp_supply *old_supply,
- struct dev_pm_opp_supply *new_supply)
- {
- struct regulator *reg = opp_table->regulators[0];
- int ret;
- /* This function only supports single regulator per device */
- if (WARN_ON(opp_table->regulator_count > 1)) {
- dev_err(dev, "multiple regulators are not supported\n");
- return -EINVAL;
- }
- /* Scaling up? Scale voltage before frequency */
- if (freq >= old_freq) {
- ret = _set_opp_voltage(dev, reg, new_supply);
- if (ret)
- goto restore_voltage;
- }
- /* Change frequency */
- ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
- if (ret)
- goto restore_voltage;
- /* Scaling down? Scale voltage after frequency */
- if (freq < old_freq) {
- ret = _set_opp_voltage(dev, reg, new_supply);
- if (ret)
- goto restore_freq;
- }
- /*
- * Enable the regulator after setting its voltages, otherwise it breaks
- * some boot-enabled regulators.
- */
- if (unlikely(!opp_table->enabled)) {
- ret = regulator_enable(reg);
- if (ret < 0)
- dev_warn(dev, "Failed to enable regulator: %d", ret);
- }
- return 0;
- restore_freq:
- if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq))
- dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
- __func__, old_freq);
- restore_voltage:
- /* This shouldn't harm even if the voltages weren't updated earlier */
- if (old_supply)
- _set_opp_voltage(dev, reg, old_supply);
- return ret;
- }
- static int _set_opp_bw(const struct opp_table *opp_table,
- struct dev_pm_opp *opp, struct device *dev, bool remove)
- {
- u32 avg, peak;
- int i, ret;
- if (!opp_table->paths)
- return 0;
- for (i = 0; i < opp_table->path_count; i++) {
- if (remove) {
- avg = 0;
- peak = 0;
- } else {
- avg = opp->bandwidth[i].avg;
- peak = opp->bandwidth[i].peak;
- }
- ret = icc_set_bw(opp_table->paths[i], avg, peak);
- if (ret) {
- dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
- remove ? "remove" : "set", i, ret);
- return ret;
- }
- }
- return 0;
- }
- static int _set_opp_custom(const struct opp_table *opp_table,
- struct device *dev, unsigned long old_freq,
- unsigned long freq,
- struct dev_pm_opp_supply *old_supply,
- struct dev_pm_opp_supply *new_supply)
- {
- struct dev_pm_set_opp_data *data;
- int size;
- data = opp_table->set_opp_data;
- data->regulators = opp_table->regulators;
- data->regulator_count = opp_table->regulator_count;
- data->clk = opp_table->clk;
- data->dev = dev;
- data->old_opp.rate = old_freq;
- size = sizeof(*old_supply) * opp_table->regulator_count;
- if (!old_supply)
- memset(data->old_opp.supplies, 0, size);
- else
- memcpy(data->old_opp.supplies, old_supply, size);
- data->new_opp.rate = freq;
- memcpy(data->new_opp.supplies, new_supply, size);
- return opp_table->set_opp(data);
- }
- static int _set_required_opp(struct device *dev, struct device *pd_dev,
- struct dev_pm_opp *opp, int i)
- {
- unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
- int ret;
- if (!pd_dev)
- return 0;
- ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
- if (ret) {
- dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
- dev_name(pd_dev), pstate, ret);
- }
- return ret;
- }
- /* This is only called for PM domain for now */
- static int _set_required_opps(struct device *dev,
- struct opp_table *opp_table,
- struct dev_pm_opp *opp, bool up)
- {
- struct opp_table **required_opp_tables = opp_table->required_opp_tables;
- struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
- int i, ret = 0;
- if (!required_opp_tables)
- return 0;
- /* Single genpd case */
- if (!genpd_virt_devs)
- return _set_required_opp(dev, dev, opp, 0);
- /* Multiple genpd case */
- /*
- * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
- * after it is freed from another thread.
- */
- mutex_lock(&opp_table->genpd_virt_dev_lock);
- /* Scaling up? Set required OPPs in normal order, else reverse */
- if (up) {
- for (i = 0; i < opp_table->required_opp_count; i++) {
- ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
- if (ret)
- break;
- }
- } else {
- for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
- ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
- if (ret)
- break;
- }
- }
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- return ret;
- }
- /**
- * dev_pm_opp_set_bw() - sets bandwidth levels corresponding to an opp
- * @dev: device for which we do this operation
- * @opp: opp based on which the bandwidth levels are to be configured
- *
- * This configures the bandwidth to the levels specified by the OPP. However
- * if the OPP specified is NULL the bandwidth levels are cleared out.
- *
- * Return: 0 on success or a negative error value.
- */
- int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- dev_err(dev, "%s: device opp table doesn't exist\n", __func__);
- return PTR_ERR(opp_table);
- }
- if (opp)
- ret = _set_opp_bw(opp_table, opp, dev, false);
- else
- ret = _set_opp_bw(opp_table, NULL, dev, true);
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_bw);
- static int _opp_set_rate_zero(struct device *dev, struct opp_table *opp_table)
- {
- int ret;
- if (!opp_table->enabled)
- return 0;
- /*
- * Some drivers need to support cases where some platforms may
- * have OPP table for the device, while others don't and
- * opp_set_rate() just needs to behave like clk_set_rate().
- */
- if (!_get_opp_count(opp_table))
- return 0;
- ret = _set_opp_bw(opp_table, NULL, dev, true);
- if (ret)
- return ret;
- if (opp_table->regulators)
- regulator_disable(opp_table->regulators[0]);
- ret = _set_required_opps(dev, opp_table, NULL, false);
- opp_table->enabled = false;
- return ret;
- }
- /**
- * dev_pm_opp_set_rate() - Configure new OPP based on frequency
- * @dev: device for which we do this operation
- * @target_freq: frequency to achieve
- *
- * This configures the power-supplies to the levels specified by the OPP
- * corresponding to the target_freq, and programs the clock to a value <=
- * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax
- * provided by the opp, should have already rounded to the target OPP's
- * frequency.
- */
- int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
- {
- struct opp_table *opp_table;
- unsigned long freq, old_freq, temp_freq;
- struct dev_pm_opp *old_opp, *opp;
- struct clk *clk;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- dev_err(dev, "%s: device opp doesn't exist\n", __func__);
- return PTR_ERR(opp_table);
- }
- if (unlikely(!target_freq)) {
- ret = _opp_set_rate_zero(dev, opp_table);
- goto put_opp_table;
- }
- clk = opp_table->clk;
- if (IS_ERR(clk)) {
- dev_err(dev, "%s: No clock available for the device\n",
- __func__);
- ret = PTR_ERR(clk);
- goto put_opp_table;
- }
- freq = clk_round_rate(clk, target_freq);
- if ((long)freq <= 0)
- freq = target_freq;
- old_freq = clk_get_rate(clk);
- /* Return early if nothing to do */
- if (opp_table->enabled && old_freq == freq) {
- dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n",
- __func__, freq);
- ret = 0;
- goto put_opp_table;
- }
- /*
- * For IO devices which require an OPP on some platforms/SoCs
- * while just needing to scale the clock on some others
- * we look for empty OPP tables with just a clock handle and
- * scale only the clk. This makes dev_pm_opp_set_rate()
- * equivalent to a clk_set_rate()
- */
- if (!_get_opp_count(opp_table)) {
- ret = _generic_set_opp_clk_only(dev, clk, freq);
- goto put_opp_table;
- }
- temp_freq = old_freq;
- old_opp = _find_freq_ceil(opp_table, &temp_freq);
- if (IS_ERR(old_opp)) {
- dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n",
- __func__, old_freq, PTR_ERR(old_opp));
- }
- temp_freq = freq;
- opp = _find_freq_ceil(opp_table, &temp_freq);
- if (IS_ERR(opp)) {
- ret = PTR_ERR(opp);
- dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
- __func__, freq, ret);
- goto put_old_opp;
- }
- dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__,
- old_freq, freq);
- /* Scaling up? Configure required OPPs before frequency */
- if (freq >= old_freq) {
- ret = _set_required_opps(dev, opp_table, opp, true);
- if (ret)
- goto put_opp;
- }
- if (opp_table->set_opp) {
- ret = _set_opp_custom(opp_table, dev, old_freq, freq,
- IS_ERR(old_opp) ? NULL : old_opp->supplies,
- opp->supplies);
- } else if (opp_table->regulators) {
- ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq,
- IS_ERR(old_opp) ? NULL : old_opp->supplies,
- opp->supplies);
- } else {
- /* Only frequency scaling */
- ret = _generic_set_opp_clk_only(dev, clk, freq);
- }
- /* Scaling down? Configure required OPPs after frequency */
- if (!ret && freq < old_freq) {
- ret = _set_required_opps(dev, opp_table, opp, false);
- if (ret)
- dev_err(dev, "Failed to set required opps: %d\n", ret);
- }
- if (!ret) {
- ret = _set_opp_bw(opp_table, opp, dev, false);
- if (!ret)
- opp_table->enabled = true;
- }
- put_opp:
- dev_pm_opp_put(opp);
- put_old_opp:
- if (!IS_ERR(old_opp))
- dev_pm_opp_put(old_opp);
- put_opp_table:
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
- /* OPP-dev Helpers */
- static void _remove_opp_dev(struct opp_device *opp_dev,
- struct opp_table *opp_table)
- {
- opp_debug_unregister(opp_dev, opp_table);
- list_del(&opp_dev->node);
- kfree(opp_dev);
- }
- static struct opp_device *_add_opp_dev_unlocked(const struct device *dev,
- struct opp_table *opp_table)
- {
- struct opp_device *opp_dev;
- opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
- if (!opp_dev)
- return NULL;
- /* Initialize opp-dev */
- opp_dev->dev = dev;
- list_add(&opp_dev->node, &opp_table->dev_list);
- /* Create debugfs entries for the opp_table */
- opp_debug_register(opp_dev, opp_table);
- return opp_dev;
- }
- struct opp_device *_add_opp_dev(const struct device *dev,
- struct opp_table *opp_table)
- {
- struct opp_device *opp_dev;
- mutex_lock(&opp_table->lock);
- opp_dev = _add_opp_dev_unlocked(dev, opp_table);
- mutex_unlock(&opp_table->lock);
- return opp_dev;
- }
- static struct opp_table *_allocate_opp_table(struct device *dev, int index)
- {
- struct opp_table *opp_table;
- struct opp_device *opp_dev;
- int ret;
- /*
- * Allocate a new OPP table. In the infrequent case where a new
- * device is needed to be added, we pay this penalty.
- */
- opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
- mutex_init(&opp_table->lock);
- mutex_init(&opp_table->genpd_virt_dev_lock);
- INIT_LIST_HEAD(&opp_table->dev_list);
- /* Mark regulator count uninitialized */
- opp_table->regulator_count = -1;
- opp_dev = _add_opp_dev(dev, opp_table);
- if (!opp_dev) {
- ret = -ENOMEM;
- goto err;
- }
- _of_init_opp_table(opp_table, dev, index);
- /* Find clk for the device */
- opp_table->clk = clk_get(dev, NULL);
- if (IS_ERR(opp_table->clk)) {
- ret = PTR_ERR(opp_table->clk);
- if (ret == -EPROBE_DEFER)
- goto remove_opp_dev;
- dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
- }
- /* Find interconnect path(s) for the device */
- ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
- if (ret) {
- if (ret == -EPROBE_DEFER)
- goto put_clk;
- dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
- __func__, ret);
- }
- BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
- INIT_LIST_HEAD(&opp_table->opp_list);
- kref_init(&opp_table->kref);
- /* Secure the device table modification */
- list_add(&opp_table->node, &opp_tables);
- return opp_table;
- put_clk:
- if (!IS_ERR(opp_table->clk))
- clk_put(opp_table->clk);
- remove_opp_dev:
- _remove_opp_dev(opp_dev, opp_table);
- err:
- kfree(opp_table);
- return ERR_PTR(ret);
- }
- void _get_opp_table_kref(struct opp_table *opp_table)
- {
- kref_get(&opp_table->kref);
- }
- static struct opp_table *_opp_get_opp_table(struct device *dev, int index)
- {
- struct opp_table *opp_table;
- /* Hold our table modification lock here */
- mutex_lock(&opp_table_lock);
- opp_table = _find_opp_table_unlocked(dev);
- if (!IS_ERR(opp_table))
- goto unlock;
- opp_table = _managed_opp(dev, index);
- if (opp_table) {
- if (!_add_opp_dev_unlocked(dev, opp_table)) {
- dev_pm_opp_put_opp_table(opp_table);
- opp_table = ERR_PTR(-ENOMEM);
- }
- goto unlock;
- }
- opp_table = _allocate_opp_table(dev, index);
- unlock:
- mutex_unlock(&opp_table_lock);
- return opp_table;
- }
- struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
- {
- return _opp_get_opp_table(dev, 0);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
- struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev,
- int index)
- {
- return _opp_get_opp_table(dev, index);
- }
- static void _opp_table_kref_release(struct kref *kref)
- {
- struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
- struct opp_device *opp_dev, *temp;
- int i;
- /* Drop the lock as soon as we can */
- list_del(&opp_table->node);
- mutex_unlock(&opp_table_lock);
- _of_clear_opp_table(opp_table);
- /* Release clk */
- if (!IS_ERR(opp_table->clk))
- clk_put(opp_table->clk);
- if (opp_table->paths) {
- for (i = 0; i < opp_table->path_count; i++)
- icc_put(opp_table->paths[i]);
- kfree(opp_table->paths);
- }
- WARN_ON(!list_empty(&opp_table->opp_list));
- list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
- /*
- * The OPP table is getting removed, drop the performance state
- * constraints.
- */
- if (opp_table->genpd_performance_state)
- dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);
- _remove_opp_dev(opp_dev, opp_table);
- }
- mutex_destroy(&opp_table->genpd_virt_dev_lock);
- mutex_destroy(&opp_table->lock);
- kfree(opp_table);
- }
- void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
- {
- kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
- &opp_table_lock);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
- void _opp_free(struct dev_pm_opp *opp)
- {
- kfree(opp);
- }
- static void _opp_kref_release(struct dev_pm_opp *opp,
- struct opp_table *opp_table)
- {
- /*
- * Notify the changes in the availability of the operable
- * frequency/voltage list.
- */
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
- _of_opp_free_required_opps(opp_table, opp);
- opp_debug_remove_one(opp);
- list_del(&opp->node);
- kfree(opp);
- }
- static void _opp_kref_release_unlocked(struct kref *kref)
- {
- struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
- struct opp_table *opp_table = opp->opp_table;
- _opp_kref_release(opp, opp_table);
- }
- static void _opp_kref_release_locked(struct kref *kref)
- {
- struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
- struct opp_table *opp_table = opp->opp_table;
- _opp_kref_release(opp, opp_table);
- mutex_unlock(&opp_table->lock);
- }
- void dev_pm_opp_get(struct dev_pm_opp *opp)
- {
- kref_get(&opp->kref);
- }
- void dev_pm_opp_put(struct dev_pm_opp *opp)
- {
- kref_put_mutex(&opp->kref, _opp_kref_release_locked,
- &opp->opp_table->lock);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put);
- static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp)
- {
- kref_put(&opp->kref, _opp_kref_release_unlocked);
- }
- /**
- * dev_pm_opp_remove() - Remove an OPP from OPP table
- * @dev: device for which we do this operation
- * @freq: OPP to remove with matching 'freq'
- *
- * This function removes an opp from the opp table.
- */
- void dev_pm_opp_remove(struct device *dev, unsigned long freq)
- {
- struct dev_pm_opp *opp;
- struct opp_table *opp_table;
- bool found = false;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return;
- mutex_lock(&opp_table->lock);
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- if (opp->rate == freq) {
- found = true;
- break;
- }
- }
- mutex_unlock(&opp_table->lock);
- if (found) {
- dev_pm_opp_put(opp);
- /* Drop the reference taken by dev_pm_opp_add() */
- dev_pm_opp_put_opp_table(opp_table);
- } else {
- dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
- __func__, freq);
- }
- /* Drop the reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
- bool _opp_remove_all_static(struct opp_table *opp_table)
- {
- struct dev_pm_opp *opp, *tmp;
- bool ret = true;
- mutex_lock(&opp_table->lock);
- if (!opp_table->parsed_static_opps) {
- ret = false;
- goto unlock;
- }
- if (--opp_table->parsed_static_opps)
- goto unlock;
- list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
- if (!opp->dynamic)
- dev_pm_opp_put_unlocked(opp);
- }
- unlock:
- mutex_unlock(&opp_table->lock);
- return ret;
- }
- /**
- * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
- * @dev: device for which we do this operation
- *
- * This function removes all dynamically created OPPs from the opp table.
- */
- void dev_pm_opp_remove_all_dynamic(struct device *dev)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *opp, *temp;
- int count = 0;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return;
- mutex_lock(&opp_table->lock);
- list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) {
- if (opp->dynamic) {
- dev_pm_opp_put_unlocked(opp);
- count++;
- }
- }
- mutex_unlock(&opp_table->lock);
- /* Drop the references taken by dev_pm_opp_add() */
- while (count--)
- dev_pm_opp_put_opp_table(opp_table);
- /* Drop the reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
- struct dev_pm_opp *_opp_allocate(struct opp_table *table)
- {
- struct dev_pm_opp *opp;
- int supply_count, supply_size, icc_size;
- /* Allocate space for at least one supply */
- supply_count = table->regulator_count > 0 ? table->regulator_count : 1;
- supply_size = sizeof(*opp->supplies) * supply_count;
- icc_size = sizeof(*opp->bandwidth) * table->path_count;
- /* allocate new OPP node and supplies structures */
- opp = kzalloc(sizeof(*opp) + supply_size + icc_size, GFP_KERNEL);
- if (!opp)
- return NULL;
- /* Put the supplies at the end of the OPP structure as an empty array */
- opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
- if (icc_size)
- opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count);
- INIT_LIST_HEAD(&opp->node);
- return opp;
- }
- static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
- struct opp_table *opp_table)
- {
- struct regulator *reg;
- int i;
- if (!opp_table->regulators)
- return true;
- for (i = 0; i < opp_table->regulator_count; i++) {
- reg = opp_table->regulators[i];
- if (!regulator_is_supported_voltage(reg,
- opp->supplies[i].u_volt_min,
- opp->supplies[i].u_volt_max)) {
- pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
- __func__, opp->supplies[i].u_volt_min,
- opp->supplies[i].u_volt_max);
- return false;
- }
- }
- return true;
- }
- int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
- {
- if (opp1->rate != opp2->rate)
- return opp1->rate < opp2->rate ? -1 : 1;
- if (opp1->bandwidth && opp2->bandwidth &&
- opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
- return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;
- if (opp1->level != opp2->level)
- return opp1->level < opp2->level ? -1 : 1;
- return 0;
- }
- static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
- struct opp_table *opp_table,
- struct list_head **head)
- {
- struct dev_pm_opp *opp;
- int opp_cmp;
- /*
- * Insert new OPP in order of increasing frequency and discard if
- * already present.
- *
- * Need to use &opp_table->opp_list in the condition part of the 'for'
- * loop, don't replace it with head otherwise it will become an infinite
- * loop.
- */
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- opp_cmp = _opp_compare_key(new_opp, opp);
- if (opp_cmp > 0) {
- *head = &opp->node;
- continue;
- }
- if (opp_cmp < 0)
- return 0;
- /* Duplicate OPPs */
- dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
- __func__, opp->rate, opp->supplies[0].u_volt,
- opp->available, new_opp->rate,
- new_opp->supplies[0].u_volt, new_opp->available);
- /* Should we compare voltages for all regulators here ? */
- return opp->available &&
- new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
- }
- return 0;
- }
- /*
- * Returns:
- * 0: On success. And appropriate error message for duplicate OPPs.
- * -EBUSY: For OPP with same freq/volt and is available. The callers of
- * _opp_add() must return 0 if they receive -EBUSY from it. This is to make
- * sure we don't print error messages unnecessarily if different parts of
- * kernel try to initialize the OPP table.
- * -EEXIST: For OPP with same freq but different volt or is unavailable. This
- * should be considered an error by the callers of _opp_add().
- */
- int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
- struct opp_table *opp_table, bool rate_not_available)
- {
- struct list_head *head;
- int ret;
- mutex_lock(&opp_table->lock);
- head = &opp_table->opp_list;
- if (likely(!rate_not_available)) {
- ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
- if (ret) {
- mutex_unlock(&opp_table->lock);
- return ret;
- }
- }
- list_add(&new_opp->node, head);
- mutex_unlock(&opp_table->lock);
- new_opp->opp_table = opp_table;
- kref_init(&new_opp->kref);
- opp_debug_create_one(new_opp, opp_table);
- if (!_opp_supported_by_regulators(new_opp, opp_table)) {
- new_opp->available = false;
- dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
- __func__, new_opp->rate);
- }
- return 0;
- }
- /**
- * _opp_add_v1() - Allocate a OPP based on v1 bindings.
- * @opp_table: OPP table
- * @dev: device for which we do this operation
- * @freq: Frequency in Hz for this OPP
- * @u_volt: Voltage in uVolts for this OPP
- * @dynamic: Dynamically added OPPs.
- *
- * This function adds an opp definition to the opp table and returns status.
- * The opp is made available by default and it can be controlled using
- * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
- *
- * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
- * and freed by dev_pm_opp_of_remove_table.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
- */
- int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
- unsigned long freq, long u_volt, bool dynamic)
- {
- struct dev_pm_opp *new_opp;
- unsigned long tol;
- int ret;
- new_opp = _opp_allocate(opp_table);
- if (!new_opp)
- return -ENOMEM;
- /* populate the opp table */
- new_opp->rate = freq;
- tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
- new_opp->supplies[0].u_volt = u_volt;
- new_opp->supplies[0].u_volt_min = u_volt - tol;
- new_opp->supplies[0].u_volt_max = u_volt + tol;
- new_opp->available = true;
- new_opp->dynamic = dynamic;
- ret = _opp_add(dev, new_opp, opp_table, false);
- if (ret) {
- /* Don't return error for duplicate OPPs */
- if (ret == -EBUSY)
- ret = 0;
- goto free_opp;
- }
- /*
- * Notify the changes in the availability of the operable
- * frequency/voltage list.
- */
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
- return 0;
- free_opp:
- _opp_free(new_opp);
- return ret;
- }
- /**
- * dev_pm_opp_set_supported_hw() - Set supported platforms
- * @dev: Device for which supported-hw has to be set.
- * @versions: Array of hierarchy of versions to match.
- * @count: Number of elements in the array.
- *
- * This is required only for the V2 bindings, and it enables a platform to
- * specify the hierarchy of versions it supports. OPP layer will then enable
- * OPPs, which are available for those versions, based on its 'opp-supported-hw'
- * property.
- */
- struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
- const u32 *versions, unsigned int count)
- {
- struct opp_table *opp_table;
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return opp_table;
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- /* Another CPU that shares the OPP table has set the property ? */
- if (opp_table->supported_hw)
- return opp_table;
- opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
- GFP_KERNEL);
- if (!opp_table->supported_hw) {
- dev_pm_opp_put_opp_table(opp_table);
- return ERR_PTR(-ENOMEM);
- }
- opp_table->supported_hw_count = count;
- return opp_table;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
- /**
- * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw
- * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().
- *
- * This is required only for the V2 bindings, and is called for a matching
- * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
- * will not be freed.
- */
- void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
- {
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- kfree(opp_table->supported_hw);
- opp_table->supported_hw = NULL;
- opp_table->supported_hw_count = 0;
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
- /**
- * dev_pm_opp_set_prop_name() - Set prop-extn name
- * @dev: Device for which the prop-name has to be set.
- * @name: name to postfix to properties.
- *
- * This is required only for the V2 bindings, and it enables a platform to
- * specify the extn to be used for certain property names. The properties to
- * which the extension will apply are opp-microvolt and opp-microamp. OPP core
- * should postfix the property name with -<name> while looking for them.
- */
- struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
- {
- struct opp_table *opp_table;
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return opp_table;
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- /* Another CPU that shares the OPP table has set the property ? */
- if (opp_table->prop_name)
- return opp_table;
- opp_table->prop_name = kstrdup(name, GFP_KERNEL);
- if (!opp_table->prop_name) {
- dev_pm_opp_put_opp_table(opp_table);
- return ERR_PTR(-ENOMEM);
- }
- return opp_table;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
- /**
- * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name
- * @opp_table: OPP table returned by dev_pm_opp_set_prop_name().
- *
- * This is required only for the V2 bindings, and is called for a matching
- * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
- * will not be freed.
- */
- void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
- {
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- kfree(opp_table->prop_name);
- opp_table->prop_name = NULL;
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
- static int _allocate_set_opp_data(struct opp_table *opp_table)
- {
- struct dev_pm_set_opp_data *data;
- int len, count = opp_table->regulator_count;
- if (WARN_ON(!opp_table->regulators))
- return -EINVAL;
- /* space for set_opp_data */
- len = sizeof(*data);
- /* space for old_opp.supplies and new_opp.supplies */
- len += 2 * sizeof(struct dev_pm_opp_supply) * count;
- data = kzalloc(len, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- data->old_opp.supplies = (void *)(data + 1);
- data->new_opp.supplies = data->old_opp.supplies + count;
- opp_table->set_opp_data = data;
- return 0;
- }
- static void _free_set_opp_data(struct opp_table *opp_table)
- {
- kfree(opp_table->set_opp_data);
- opp_table->set_opp_data = NULL;
- }
- /**
- * dev_pm_opp_set_regulators() - Set regulator names for the device
- * @dev: Device for which regulator name is being set.
- * @names: Array of pointers to the names of the regulator.
- * @count: Number of regulators.
- *
- * In order to support OPP switching, OPP layer needs to know the name of the
- * device's regulators, as the core would be required to switch voltages as
- * well.
- *
- * This must be called before any OPPs are initialized for the device.
- */
- struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
- const char * const names[],
- unsigned int count)
- {
- struct opp_table *opp_table;
- struct regulator *reg;
- int ret, i;
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return opp_table;
- /* This should be called before OPPs are initialized */
- if (WARN_ON(!list_empty(&opp_table->opp_list))) {
- ret = -EBUSY;
- goto err;
- }
- /* Another CPU that shares the OPP table has set the regulators ? */
- if (opp_table->regulators)
- return opp_table;
- opp_table->regulators = kmalloc_array(count,
- sizeof(*opp_table->regulators),
- GFP_KERNEL);
- if (!opp_table->regulators) {
- ret = -ENOMEM;
- goto err;
- }
- for (i = 0; i < count; i++) {
- reg = regulator_get_optional(dev, names[i]);
- if (IS_ERR(reg)) {
- ret = PTR_ERR(reg);
- if (ret != -EPROBE_DEFER)
- dev_err(dev, "%s: no regulator (%s) found: %d\n",
- __func__, names[i], ret);
- goto free_regulators;
- }
- opp_table->regulators[i] = reg;
- }
- opp_table->regulator_count = count;
- /* Allocate block only once to pass to set_opp() routines */
- ret = _allocate_set_opp_data(opp_table);
- if (ret)
- goto free_regulators;
- return opp_table;
- free_regulators:
- while (i != 0)
- regulator_put(opp_table->regulators[--i]);
- kfree(opp_table->regulators);
- opp_table->regulators = NULL;
- opp_table->regulator_count = -1;
- err:
- dev_pm_opp_put_opp_table(opp_table);
- return ERR_PTR(ret);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
- /**
- * dev_pm_opp_put_regulators() - Releases resources blocked for regulator
- * @opp_table: OPP table returned from dev_pm_opp_set_regulators().
- */
- void dev_pm_opp_put_regulators(struct opp_table *opp_table)
- {
- int i;
- if (!opp_table->regulators)
- goto put_opp_table;
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- if (opp_table->enabled) {
- for (i = opp_table->regulator_count - 1; i >= 0; i--)
- regulator_disable(opp_table->regulators[i]);
- }
- for (i = opp_table->regulator_count - 1; i >= 0; i--)
- regulator_put(opp_table->regulators[i]);
- _free_set_opp_data(opp_table);
- kfree(opp_table->regulators);
- opp_table->regulators = NULL;
- opp_table->regulator_count = -1;
- put_opp_table:
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
- /**
- * dev_pm_opp_set_clkname() - Set clk name for the device
- * @dev: Device for which clk name is being set.
- * @name: Clk name.
- *
- * In order to support OPP switching, OPP layer needs to get pointer to the
- * clock for the device. Simple cases work fine without using this routine (i.e.
- * by passing connection-id as NULL), but for a device with multiple clocks
- * available, the OPP core needs to know the exact name of the clk to use.
- *
- * This must be called before any OPPs are initialized for the device.
- */
- struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return opp_table;
- /* This should be called before OPPs are initialized */
- if (WARN_ON(!list_empty(&opp_table->opp_list))) {
- ret = -EBUSY;
- goto err;
- }
- /* Already have default clk set, free it */
- if (!IS_ERR(opp_table->clk))
- clk_put(opp_table->clk);
- /* Find clk for the device */
- opp_table->clk = clk_get(dev, name);
- if (IS_ERR(opp_table->clk)) {
- ret = PTR_ERR(opp_table->clk);
- if (ret != -EPROBE_DEFER) {
- dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
- ret);
- }
- goto err;
- }
- return opp_table;
- err:
- dev_pm_opp_put_opp_table(opp_table);
- return ERR_PTR(ret);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
- /**
- * dev_pm_opp_put_clkname() - Releases resources blocked for clk.
- * @opp_table: OPP table returned from dev_pm_opp_set_clkname().
- */
- void dev_pm_opp_put_clkname(struct opp_table *opp_table)
- {
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- clk_put(opp_table->clk);
- opp_table->clk = ERR_PTR(-EINVAL);
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
- /**
- * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
- * @dev: Device for which the helper is getting registered.
- * @set_opp: Custom set OPP helper.
- *
- * This is useful to support complex platforms (like platforms with multiple
- * regulators per device), instead of the generic OPP set rate helper.
- *
- * This must be called before any OPPs are initialized for the device.
- */
- struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
- int (*set_opp)(struct dev_pm_set_opp_data *data))
- {
- struct opp_table *opp_table;
- if (!set_opp)
- return ERR_PTR(-EINVAL);
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return opp_table;
- /* This should be called before OPPs are initialized */
- if (WARN_ON(!list_empty(&opp_table->opp_list))) {
- dev_pm_opp_put_opp_table(opp_table);
- return ERR_PTR(-EBUSY);
- }
- /* Another CPU that shares the OPP table has set the helper ? */
- if (!opp_table->set_opp)
- opp_table->set_opp = set_opp;
- return opp_table;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
- /**
- * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for
- * set_opp helper
- * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
- *
- * Release resources blocked for platform specific set_opp helper.
- */
- void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
- {
- /* Make sure there are no concurrent readers while updating opp_table */
- WARN_ON(!list_empty(&opp_table->opp_list));
- opp_table->set_opp = NULL;
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
- static void _opp_detach_genpd(struct opp_table *opp_table)
- {
- int index;
- if (!opp_table->genpd_virt_devs)
- return;
- for (index = 0; index < opp_table->required_opp_count; index++) {
- if (!opp_table->genpd_virt_devs[index])
- continue;
- dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
- opp_table->genpd_virt_devs[index] = NULL;
- }
- kfree(opp_table->genpd_virt_devs);
- opp_table->genpd_virt_devs = NULL;
- }
- /**
- * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
- * @dev: Consumer device for which the genpd is getting attached.
- * @names: Null terminated array of pointers containing names of genpd to attach.
- * @virt_devs: Pointer to return the array of virtual devices.
- *
- * Multiple generic power domains for a device are supported with the help of
- * virtual genpd devices, which are created for each consumer device - genpd
- * pair. These are the device structures which are attached to the power domain
- * and are required by the OPP core to set the performance state of the genpd.
- * The same API also works for the case where single genpd is available and so
- * we don't need to support that separately.
- *
- * This helper will normally be called by the consumer driver of the device
- * "dev", as only that has details of the genpd names.
- *
- * This helper needs to be called once with a list of all genpd to attach.
- * Otherwise the original device structure will be used instead by the OPP core.
- *
- * The order of entries in the names array must match the order in which
- * "required-opps" are added in DT.
- */
- struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
- const char **names, struct device ***virt_devs)
- {
- struct opp_table *opp_table;
- struct device *virt_dev;
- int index = 0, ret = -EINVAL;
- const char **name = names;
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return opp_table;
- if (opp_table->genpd_virt_devs)
- return opp_table;
- /*
- * If the genpd's OPP table isn't already initialized, parsing of the
- * required-opps fail for dev. We should retry this after genpd's OPP
- * table is added.
- */
- if (!opp_table->required_opp_count) {
- ret = -EPROBE_DEFER;
- goto put_table;
- }
- mutex_lock(&opp_table->genpd_virt_dev_lock);
- opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
- sizeof(*opp_table->genpd_virt_devs),
- GFP_KERNEL);
- if (!opp_table->genpd_virt_devs)
- goto unlock;
- while (*name) {
- if (index >= opp_table->required_opp_count) {
- dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
- *name, opp_table->required_opp_count, index);
- goto err;
- }
- virt_dev = dev_pm_domain_attach_by_name(dev, *name);
- if (IS_ERR(virt_dev)) {
- ret = PTR_ERR(virt_dev);
- dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
- goto err;
- }
- opp_table->genpd_virt_devs[index] = virt_dev;
- index++;
- name++;
- }
- if (virt_devs)
- *virt_devs = opp_table->genpd_virt_devs;
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- return opp_table;
- err:
- _opp_detach_genpd(opp_table);
- unlock:
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- put_table:
- dev_pm_opp_put_opp_table(opp_table);
- return ERR_PTR(ret);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd);
- /**
- * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device.
- * @opp_table: OPP table returned by dev_pm_opp_attach_genpd().
- *
- * This detaches the genpd(s), resets the virtual device pointers, and puts the
- * OPP table.
- */
- void dev_pm_opp_detach_genpd(struct opp_table *opp_table)
- {
- /*
- * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
- * used in parallel.
- */
- mutex_lock(&opp_table->genpd_virt_dev_lock);
- _opp_detach_genpd(opp_table);
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd);
- /**
- * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
- * @src_table: OPP table which has dst_table as one of its required OPP table.
- * @dst_table: Required OPP table of the src_table.
- * @pstate: Current performance state of the src_table.
- *
- * This Returns pstate of the OPP (present in @dst_table) pointed out by the
- * "required-opps" property of the OPP (present in @src_table) which has
- * performance state set to @pstate.
- *
- * Return: Zero or positive performance state on success, otherwise negative
- * value on errors.
- */
- int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
- struct opp_table *dst_table,
- unsigned int pstate)
- {
- struct dev_pm_opp *opp;
- int dest_pstate = -EINVAL;
- int i;
- /*
- * Normally the src_table will have the "required_opps" property set to
- * point to one of the OPPs in the dst_table, but in some cases the
- * genpd and its master have one to one mapping of performance states
- * and so none of them have the "required-opps" property set. Return the
- * pstate of the src_table as it is in such cases.
- */
- if (!src_table->required_opp_count)
- return pstate;
- for (i = 0; i < src_table->required_opp_count; i++) {
- if (src_table->required_opp_tables[i]->np == dst_table->np)
- break;
- }
- if (unlikely(i == src_table->required_opp_count)) {
- pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
- __func__, src_table, dst_table);
- return -EINVAL;
- }
- mutex_lock(&src_table->lock);
- list_for_each_entry(opp, &src_table->opp_list, node) {
- if (opp->pstate == pstate) {
- dest_pstate = opp->required_opps[i]->pstate;
- goto unlock;
- }
- }
- pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
- dst_table);
- unlock:
- mutex_unlock(&src_table->lock);
- return dest_pstate;
- }
- /**
- * dev_pm_opp_add() - Add an OPP table from a table definitions
- * @dev: device for which we do this operation
- * @freq: Frequency in Hz for this OPP
- * @u_volt: Voltage in uVolts for this OPP
- *
- * This function adds an opp definition to the opp table and returns status.
- * The opp is made available by default and it can be controlled using
- * dev_pm_opp_enable/disable functions.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
- */
- int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = dev_pm_opp_get_opp_table(dev);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- /* Fix regulator count for dynamic OPPs */
- opp_table->regulator_count = 1;
- ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
- if (ret)
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_add);
- /**
- * _opp_set_availability() - helper to set the availability of an opp
- * @dev: device for which we do this operation
- * @freq: OPP frequency to modify availability
- * @availability_req: availability status requested for this opp
- *
- * Set the availability of an OPP, opp_{enable,disable} share a common logic
- * which is isolated here.
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modification was done OR modification was
- * successful.
- */
- static int _opp_set_availability(struct device *dev, unsigned long freq,
- bool availability_req)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
- int r = 0;
- /* Find the opp_table */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- r = PTR_ERR(opp_table);
- dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
- return r;
- }
- mutex_lock(&opp_table->lock);
- /* Do we have the frequency? */
- list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
- if (tmp_opp->rate == freq) {
- opp = tmp_opp;
- break;
- }
- }
- if (IS_ERR(opp)) {
- r = PTR_ERR(opp);
- goto unlock;
- }
- /* Is update really needed? */
- if (opp->available == availability_req)
- goto unlock;
- opp->available = availability_req;
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- /* Notify the change of the OPP availability */
- if (availability_req)
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
- opp);
- else
- blocking_notifier_call_chain(&opp_table->head,
- OPP_EVENT_DISABLE, opp);
- dev_pm_opp_put(opp);
- goto put_table;
- unlock:
- mutex_unlock(&opp_table->lock);
- put_table:
- dev_pm_opp_put_opp_table(opp_table);
- return r;
- }
- /**
- * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP
- * @dev: device for which we do this operation
- * @freq: OPP frequency to adjust voltage of
- * @u_volt: new OPP target voltage
- * @u_volt_min: new OPP min voltage
- * @u_volt_max: new OPP max voltage
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modifcation was done OR modification was
- * successful.
- */
- int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
- unsigned long u_volt, unsigned long u_volt_min,
- unsigned long u_volt_max)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
- int r = 0;
- /* Find the opp_table */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- r = PTR_ERR(opp_table);
- dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
- return r;
- }
- mutex_lock(&opp_table->lock);
- /* Do we have the frequency? */
- list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
- if (tmp_opp->rate == freq) {
- opp = tmp_opp;
- break;
- }
- }
- if (IS_ERR(opp)) {
- r = PTR_ERR(opp);
- goto adjust_unlock;
- }
- /* Is update really needed? */
- if (opp->supplies->u_volt == u_volt)
- goto adjust_unlock;
- opp->supplies->u_volt = u_volt;
- opp->supplies->u_volt_min = u_volt_min;
- opp->supplies->u_volt_max = u_volt_max;
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- /* Notify the voltage change of the OPP */
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE,
- opp);
- dev_pm_opp_put(opp);
- goto adjust_put_table;
- adjust_unlock:
- mutex_unlock(&opp_table->lock);
- adjust_put_table:
- dev_pm_opp_put_opp_table(opp_table);
- return r;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);
- /**
- * dev_pm_opp_enable() - Enable a specific OPP
- * @dev: device for which we do this operation
- * @freq: OPP frequency to enable
- *
- * Enables a provided opp. If the operation is valid, this returns 0, else the
- * corresponding error value. It is meant to be used for users an OPP available
- * after being temporarily made unavailable with dev_pm_opp_disable.
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modification was done OR modification was
- * successful.
- */
- int dev_pm_opp_enable(struct device *dev, unsigned long freq)
- {
- return _opp_set_availability(dev, freq, true);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
- /**
- * dev_pm_opp_disable() - Disable a specific OPP
- * @dev: device for which we do this operation
- * @freq: OPP frequency to disable
- *
- * Disables a provided opp. If the operation is valid, this returns
- * 0, else the corresponding error value. It is meant to be a temporary
- * control by users to make this OPP not available until the circumstances are
- * right to make it available again (with a call to dev_pm_opp_enable).
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modification was done OR modification was
- * successful.
- */
- int dev_pm_opp_disable(struct device *dev, unsigned long freq)
- {
- return _opp_set_availability(dev, freq, false);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
- /**
- * dev_pm_opp_register_notifier() - Register OPP notifier for the device
- * @dev: Device for which notifier needs to be registered
- * @nb: Notifier block to be registered
- *
- * Return: 0 on success or a negative error value.
- */
- int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- ret = blocking_notifier_chain_register(&opp_table->head, nb);
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL(dev_pm_opp_register_notifier);
- /**
- * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
- * @dev: Device for which notifier needs to be unregistered
- * @nb: Notifier block to be unregistered
- *
- * Return: 0 on success or a negative error value.
- */
- int dev_pm_opp_unregister_notifier(struct device *dev,
- struct notifier_block *nb)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
- /**
- * dev_pm_opp_remove_table() - Free all OPPs associated with the device
- * @dev: device pointer used to lookup OPP table.
- *
- * Free both OPPs created using static entries present in DT and the
- * dynamically added entries.
- */
- void dev_pm_opp_remove_table(struct device *dev)
- {
- struct opp_table *opp_table;
- /* Check for existing table for 'dev' */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- int error = PTR_ERR(opp_table);
- if (error != -ENODEV)
- WARN(1, "%s: opp_table: %d\n",
- IS_ERR_OR_NULL(dev) ?
- "Invalid device" : dev_name(dev),
- error);
- return;
- }
- /*
- * Drop the extra reference only if the OPP table was successfully added
- * with dev_pm_opp_of_add_table() earlier.
- **/
- if (_opp_remove_all_static(opp_table))
- dev_pm_opp_put_opp_table(opp_table);
- /* Drop reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
|