mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Dmitry Osipenko](/assets/img/avatar_default.png)
Elements of the 'names' array are not changed by the code, constify them for consistency. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2933 lines
76 KiB
C
2933 lines
76 KiB
C
// 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);
|
|
|
|
/* OPP tables with uninitialized required OPPs */
|
|
LIST_HEAD(lazy_opp_tables);
|
|
|
|
/* Lock to allow exclusive modification to the device and opp lists */
|
|
DEFINE_MUTEX(opp_table_lock);
|
|
/* Flag indicating that opp_tables list is being updated at the moment */
|
|
static bool opp_tables_busy;
|
|
|
|
static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table)
|
|
{
|
|
struct opp_device *opp_dev;
|
|
bool found = false;
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
list_for_each_entry(opp_dev, &opp_table->dev_list, node)
|
|
if (opp_dev->dev == dev) {
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&opp_table->lock);
|
|
return found;
|
|
}
|
|
|
|
static struct opp_table *_find_opp_table_unlocked(struct device *dev)
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
list_for_each_entry(opp_table, &opp_tables, node) {
|
|
if (_find_opp_dev(dev, opp_table)) {
|
|
_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_get_required_pstate() - Gets the required performance state
|
|
* corresponding to an available opp
|
|
* @opp: opp for which performance state has to be returned for
|
|
* @index: index of the required opp
|
|
*
|
|
* Return: performance state read from device tree corresponding to the
|
|
* required opp, else return 0.
|
|
*/
|
|
unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
|
|
unsigned int index)
|
|
{
|
|
if (IS_ERR_OR_NULL(opp) || !opp->available ||
|
|
index >= opp->opp_table->required_opp_count) {
|
|
pr_err("%s: Invalid parameters\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
/* required-opps not fully initialized yet */
|
|
if (lazy_linking_pending(opp->opp_table))
|
|
return 0;
|
|
|
|
return opp->required_opps[index]->pstate;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* dev_pm_opp_find_level_ceil() - search for an rounded up level
|
|
* @dev: device for which we do this operation
|
|
* @level: level to search for
|
|
*
|
|
* Return: Searches for rounded up 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_ceil(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->available && temp_opp->level >= *level) {
|
|
opp = temp_opp;
|
|
*level = opp->level;
|
|
|
|
/* 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_ceil);
|
|
|
|
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;
|
|
|
|
/* We may reach here for devices which don't change frequency */
|
|
if (IS_ERR(clk))
|
|
return 0;
|
|
|
|
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,
|
|
struct dev_pm_opp *opp,
|
|
unsigned long freq,
|
|
int scaling_down)
|
|
{
|
|
struct regulator *reg = opp_table->regulators[0];
|
|
struct dev_pm_opp *old_opp = opp_table->current_opp;
|
|
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 (!scaling_down) {
|
|
ret = _set_opp_voltage(dev, reg, opp->supplies);
|
|
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 (scaling_down) {
|
|
ret = _set_opp_voltage(dev, reg, opp->supplies);
|
|
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_opp->rate))
|
|
dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
|
|
__func__, old_opp->rate);
|
|
restore_voltage:
|
|
/* This shouldn't harm even if the voltages weren't updated earlier */
|
|
_set_opp_voltage(dev, reg, old_opp->supplies);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _set_opp_bw(const struct opp_table *opp_table,
|
|
struct dev_pm_opp *opp, struct device *dev)
|
|
{
|
|
u32 avg, peak;
|
|
int i, ret;
|
|
|
|
if (!opp_table->paths)
|
|
return 0;
|
|
|
|
for (i = 0; i < opp_table->path_count; i++) {
|
|
if (!opp) {
|
|
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",
|
|
opp ? "set" : "remove", i, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int _set_opp_custom(const struct opp_table *opp_table,
|
|
struct device *dev, struct dev_pm_opp *opp,
|
|
unsigned long freq)
|
|
{
|
|
struct dev_pm_set_opp_data *data = opp_table->set_opp_data;
|
|
struct dev_pm_opp *old_opp = opp_table->current_opp;
|
|
int size;
|
|
|
|
/*
|
|
* We support this only if dev_pm_opp_set_regulators() was called
|
|
* earlier.
|
|
*/
|
|
if (opp_table->sod_supplies) {
|
|
size = sizeof(*old_opp->supplies) * opp_table->regulator_count;
|
|
memcpy(data->old_opp.supplies, old_opp->supplies, size);
|
|
memcpy(data->new_opp.supplies, opp->supplies, size);
|
|
data->regulator_count = opp_table->regulator_count;
|
|
} else {
|
|
data->regulator_count = 0;
|
|
}
|
|
|
|
data->regulators = opp_table->regulators;
|
|
data->clk = opp_table->clk;
|
|
data->dev = dev;
|
|
data->old_opp.rate = old_opp->rate;
|
|
data->new_opp.rate = freq;
|
|
|
|
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;
|
|
|
|
/* required-opps not fully initialized yet */
|
|
if (lazy_linking_pending(opp_table))
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* We only support genpd's OPPs in the "required-opps" for now, as we
|
|
* don't know much about other use cases. Error out if the required OPP
|
|
* doesn't belong to a genpd.
|
|
*/
|
|
if (unlikely(!required_opp_tables[0]->is_genpd)) {
|
|
dev_err(dev, "required-opps don't belong to a genpd\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
|
|
{
|
|
struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
|
|
unsigned long freq;
|
|
|
|
if (!IS_ERR(opp_table->clk)) {
|
|
freq = clk_get_rate(opp_table->clk);
|
|
opp = _find_freq_ceil(opp_table, &freq);
|
|
}
|
|
|
|
/*
|
|
* Unable to find the current OPP ? Pick the first from the list since
|
|
* it is in ascending order, otherwise rest of the code will need to
|
|
* make special checks to validate current_opp.
|
|
*/
|
|
if (IS_ERR(opp)) {
|
|
mutex_lock(&opp_table->lock);
|
|
opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node);
|
|
dev_pm_opp_get(opp);
|
|
mutex_unlock(&opp_table->lock);
|
|
}
|
|
|
|
opp_table->current_opp = opp;
|
|
}
|
|
|
|
static int _disable_opp_table(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);
|
|
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;
|
|
}
|
|
|
|
static int _set_opp(struct device *dev, struct opp_table *opp_table,
|
|
struct dev_pm_opp *opp, unsigned long freq)
|
|
{
|
|
struct dev_pm_opp *old_opp;
|
|
int scaling_down, ret;
|
|
|
|
if (unlikely(!opp))
|
|
return _disable_opp_table(dev, opp_table);
|
|
|
|
/* Find the currently set OPP if we don't know already */
|
|
if (unlikely(!opp_table->current_opp))
|
|
_find_current_opp(dev, opp_table);
|
|
|
|
old_opp = opp_table->current_opp;
|
|
|
|
/* Return early if nothing to do */
|
|
if (old_opp == opp && opp_table->current_rate == freq &&
|
|
opp_table->enabled) {
|
|
dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n",
|
|
__func__, opp_table->current_rate, freq, old_opp->level,
|
|
opp->level, old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
|
|
opp->bandwidth ? opp->bandwidth[0].peak : 0);
|
|
|
|
scaling_down = _opp_compare_key(old_opp, opp);
|
|
if (scaling_down == -1)
|
|
scaling_down = 0;
|
|
|
|
/* Scaling up? Configure required OPPs before frequency */
|
|
if (!scaling_down) {
|
|
ret = _set_required_opps(dev, opp_table, opp, true);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to set required opps: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = _set_opp_bw(opp_table, opp, dev);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to set bw: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (opp_table->set_opp) {
|
|
ret = _set_opp_custom(opp_table, dev, opp, freq);
|
|
} else if (opp_table->regulators) {
|
|
ret = _generic_set_opp_regulator(opp_table, dev, opp, freq,
|
|
scaling_down);
|
|
} else {
|
|
/* Only frequency scaling */
|
|
ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
|
|
}
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Scaling down? Configure required OPPs after frequency */
|
|
if (scaling_down) {
|
|
ret = _set_opp_bw(opp_table, opp, dev);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to set bw: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = _set_required_opps(dev, opp_table, opp, false);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to set required opps: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
opp_table->enabled = true;
|
|
dev_pm_opp_put(old_opp);
|
|
|
|
/* Make sure current_opp doesn't get freed */
|
|
dev_pm_opp_get(opp);
|
|
opp_table->current_opp = opp;
|
|
opp_table->current_rate = freq;
|
|
|
|
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 = 0, temp_freq;
|
|
struct dev_pm_opp *opp = NULL;
|
|
int ret;
|
|
|
|
opp_table = _find_opp_table(dev);
|
|
if (IS_ERR(opp_table)) {
|
|
dev_err(dev, "%s: device's opp table doesn't exist\n", __func__);
|
|
return PTR_ERR(opp_table);
|
|
}
|
|
|
|
if (target_freq) {
|
|
/*
|
|
* 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, opp_table->clk, target_freq);
|
|
goto put_opp_table;
|
|
}
|
|
|
|
freq = clk_round_rate(opp_table->clk, target_freq);
|
|
if ((long)freq <= 0)
|
|
freq = target_freq;
|
|
|
|
/*
|
|
* The clock driver may support finer resolution of the
|
|
* frequencies than the OPP table, don't update the frequency we
|
|
* pass to clk_set_rate() here.
|
|
*/
|
|
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_opp_table;
|
|
}
|
|
}
|
|
|
|
ret = _set_opp(dev, opp_table, opp, freq);
|
|
|
|
if (target_freq)
|
|
dev_pm_opp_put(opp);
|
|
put_opp_table:
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
|
|
|
|
/**
|
|
* dev_pm_opp_set_opp() - Configure device for OPP
|
|
* @dev: device for which we do this operation
|
|
* @opp: OPP to set to
|
|
*
|
|
* This configures the device based on the properties of the OPP passed to this
|
|
* routine.
|
|
*
|
|
* Return: 0 on success, a negative error number otherwise.
|
|
*/
|
|
int dev_pm_opp_set_opp(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 doesn't exist\n", __func__);
|
|
return PTR_ERR(opp_table);
|
|
}
|
|
|
|
ret = _set_opp(dev, opp_table, opp, opp ? opp->rate : 0);
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_set_opp);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
struct opp_device *_add_opp_dev(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;
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
list_add(&opp_dev->node, &opp_table->dev_list);
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
/* Create debugfs entries for the opp_table */
|
|
opp_debug_register(opp_dev, opp_table);
|
|
|
|
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);
|
|
INIT_LIST_HEAD(&opp_table->lazy);
|
|
|
|
/* 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 interconnect path(s) for the device */
|
|
ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
|
|
if (ret) {
|
|
if (ret == -EPROBE_DEFER)
|
|
goto remove_opp_dev;
|
|
|
|
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);
|
|
|
|
return opp_table;
|
|
|
|
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 *_update_opp_table_clk(struct device *dev,
|
|
struct opp_table *opp_table,
|
|
bool getclk)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Return early if we don't need to get clk or we have already tried it
|
|
* earlier.
|
|
*/
|
|
if (!getclk || IS_ERR(opp_table) || opp_table->clk)
|
|
return opp_table;
|
|
|
|
/* Find clk for the device */
|
|
opp_table->clk = clk_get(dev, NULL);
|
|
|
|
ret = PTR_ERR_OR_ZERO(opp_table->clk);
|
|
if (!ret)
|
|
return opp_table;
|
|
|
|
if (ret == -ENOENT) {
|
|
dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
|
|
return opp_table;
|
|
}
|
|
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
dev_err_probe(dev, ret, "Couldn't find clock\n");
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* We need to make sure that the OPP table for a device doesn't get added twice,
|
|
* if this routine gets called in parallel with the same device pointer.
|
|
*
|
|
* The simplest way to enforce that is to perform everything (find existing
|
|
* table and if not found, create a new one) under the opp_table_lock, so only
|
|
* one creator gets access to the same. But that expands the critical section
|
|
* under the lock and may end up causing circular dependencies with frameworks
|
|
* like debugfs, interconnect or clock framework as they may be direct or
|
|
* indirect users of OPP core.
|
|
*
|
|
* And for that reason we have to go for a bit tricky implementation here, which
|
|
* uses the opp_tables_busy flag to indicate if another creator is in the middle
|
|
* of adding an OPP table and others should wait for it to finish.
|
|
*/
|
|
struct opp_table *_add_opp_table_indexed(struct device *dev, int index,
|
|
bool getclk)
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
again:
|
|
mutex_lock(&opp_table_lock);
|
|
|
|
opp_table = _find_opp_table_unlocked(dev);
|
|
if (!IS_ERR(opp_table))
|
|
goto unlock;
|
|
|
|
/*
|
|
* The opp_tables list or an OPP table's dev_list is getting updated by
|
|
* another user, wait for it to finish.
|
|
*/
|
|
if (unlikely(opp_tables_busy)) {
|
|
mutex_unlock(&opp_table_lock);
|
|
cpu_relax();
|
|
goto again;
|
|
}
|
|
|
|
opp_tables_busy = true;
|
|
opp_table = _managed_opp(dev, index);
|
|
|
|
/* Drop the lock to reduce the size of critical section */
|
|
mutex_unlock(&opp_table_lock);
|
|
|
|
if (opp_table) {
|
|
if (!_add_opp_dev(dev, opp_table)) {
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
opp_table = ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
mutex_lock(&opp_table_lock);
|
|
} else {
|
|
opp_table = _allocate_opp_table(dev, index);
|
|
|
|
mutex_lock(&opp_table_lock);
|
|
if (!IS_ERR(opp_table))
|
|
list_add(&opp_table->node, &opp_tables);
|
|
}
|
|
|
|
opp_tables_busy = false;
|
|
|
|
unlock:
|
|
mutex_unlock(&opp_table_lock);
|
|
|
|
return _update_opp_table_clk(dev, opp_table, getclk);
|
|
}
|
|
|
|
static struct opp_table *_add_opp_table(struct device *dev, bool getclk)
|
|
{
|
|
return _add_opp_table_indexed(dev, 0, getclk);
|
|
}
|
|
|
|
struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
|
|
{
|
|
return _find_opp_table(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
|
|
|
|
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);
|
|
|
|
if (opp_table->current_opp)
|
|
dev_pm_opp_put(opp_table->current_opp);
|
|
|
|
_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 kref *kref)
|
|
{
|
|
struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
|
|
struct opp_table *opp_table = opp->opp_table;
|
|
|
|
list_del(&opp->node);
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
/*
|
|
* 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);
|
|
kfree(opp);
|
|
}
|
|
|
|
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, &opp->opp_table->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_put);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
|
|
bool dynamic)
|
|
{
|
|
struct dev_pm_opp *opp = NULL, *temp;
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
list_for_each_entry(temp, &opp_table->opp_list, node) {
|
|
/*
|
|
* Refcount must be dropped only once for each OPP by OPP core,
|
|
* do that with help of "removed" flag.
|
|
*/
|
|
if (!temp->removed && dynamic == temp->dynamic) {
|
|
opp = temp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&opp_table->lock);
|
|
return opp;
|
|
}
|
|
|
|
/*
|
|
* Can't call dev_pm_opp_put() from under the lock as debugfs removal needs to
|
|
* happen lock less to avoid circular dependency issues. This routine must be
|
|
* called without the opp_table->lock held.
|
|
*/
|
|
static void _opp_remove_all(struct opp_table *opp_table, bool dynamic)
|
|
{
|
|
struct dev_pm_opp *opp;
|
|
|
|
while ((opp = _opp_get_next(opp_table, dynamic))) {
|
|
opp->removed = true;
|
|
dev_pm_opp_put(opp);
|
|
|
|
/* Drop the references taken by dev_pm_opp_add() */
|
|
if (dynamic)
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
}
|
|
}
|
|
|
|
bool _opp_remove_all_static(struct opp_table *opp_table)
|
|
{
|
|
mutex_lock(&opp_table->lock);
|
|
|
|
if (!opp_table->parsed_static_opps) {
|
|
mutex_unlock(&opp_table->lock);
|
|
return false;
|
|
}
|
|
|
|
if (--opp_table->parsed_static_opps) {
|
|
mutex_unlock(&opp_table->lock);
|
|
return true;
|
|
}
|
|
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
_opp_remove_all(opp_table, false);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
opp_table = _find_opp_table(dev);
|
|
if (IS_ERR(opp_table))
|
|
return;
|
|
|
|
_opp_remove_all(opp_table, true);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
void _required_opps_available(struct dev_pm_opp *opp, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (opp->required_opps[i]->available)
|
|
continue;
|
|
|
|
opp->available = false;
|
|
pr_warn("%s: OPP not supported by required OPP %pOF (%lu)\n",
|
|
__func__, opp->required_opps[i]->np, opp->rate);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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);
|
|
}
|
|
|
|
/* required-opps not fully initialized yet */
|
|
if (lazy_linking_pending(opp_table))
|
|
return 0;
|
|
|
|
_required_opps_available(new_opp, opp_table->required_opp_count);
|
|
|
|
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 = _add_opp_table(dev, false);
|
|
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)
|
|
{
|
|
if (unlikely(!opp_table))
|
|
return;
|
|
|
|
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);
|
|
|
|
static void devm_pm_opp_supported_hw_release(void *data)
|
|
{
|
|
dev_pm_opp_put_supported_hw(data);
|
|
}
|
|
|
|
/**
|
|
* devm_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 a resource-managed variant of dev_pm_opp_set_supported_hw().
|
|
*
|
|
* Return: 0 on success and errorno otherwise.
|
|
*/
|
|
int devm_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
|
|
unsigned int count)
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = dev_pm_opp_set_supported_hw(dev, versions, count);
|
|
if (IS_ERR(opp_table))
|
|
return PTR_ERR(opp_table);
|
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_supported_hw_release,
|
|
opp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_opp_set_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 = _add_opp_table(dev, false);
|
|
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)
|
|
{
|
|
if (unlikely(!opp_table))
|
|
return;
|
|
|
|
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);
|
|
|
|
/**
|
|
* 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 dev_pm_opp_supply *supplies;
|
|
struct opp_table *opp_table;
|
|
struct regulator *reg;
|
|
int ret, i;
|
|
|
|
opp_table = _add_opp_table(dev, false);
|
|
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;
|
|
|
|
supplies = kmalloc_array(count * 2, sizeof(*supplies), GFP_KERNEL);
|
|
if (!supplies) {
|
|
ret = -ENOMEM;
|
|
goto free_regulators;
|
|
}
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
opp_table->sod_supplies = supplies;
|
|
if (opp_table->set_opp_data) {
|
|
opp_table->set_opp_data->old_opp.supplies = supplies;
|
|
opp_table->set_opp_data->new_opp.supplies = supplies + count;
|
|
}
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
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 (unlikely(!opp_table))
|
|
return;
|
|
|
|
if (!opp_table->regulators)
|
|
goto put_opp_table;
|
|
|
|
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]);
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
if (opp_table->set_opp_data) {
|
|
opp_table->set_opp_data->old_opp.supplies = NULL;
|
|
opp_table->set_opp_data->new_opp.supplies = NULL;
|
|
}
|
|
|
|
kfree(opp_table->sod_supplies);
|
|
opp_table->sod_supplies = NULL;
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
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);
|
|
|
|
static void devm_pm_opp_regulators_release(void *data)
|
|
{
|
|
dev_pm_opp_put_regulators(data);
|
|
}
|
|
|
|
/**
|
|
* devm_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.
|
|
*
|
|
* This is a resource-managed variant of dev_pm_opp_set_regulators().
|
|
*
|
|
* Return: 0 on success and errorno otherwise.
|
|
*/
|
|
int devm_pm_opp_set_regulators(struct device *dev,
|
|
const char * const names[],
|
|
unsigned int count)
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = dev_pm_opp_set_regulators(dev, names, count);
|
|
if (IS_ERR(opp_table))
|
|
return PTR_ERR(opp_table);
|
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_regulators_release,
|
|
opp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_opp_set_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 = _add_opp_table(dev, false);
|
|
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;
|
|
}
|
|
|
|
/* clk shouldn't be initialized at this point */
|
|
if (WARN_ON(opp_table->clk)) {
|
|
ret = -EBUSY;
|
|
goto err;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
if (unlikely(!opp_table))
|
|
return;
|
|
|
|
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);
|
|
|
|
static void devm_pm_opp_clkname_release(void *data)
|
|
{
|
|
dev_pm_opp_put_clkname(data);
|
|
}
|
|
|
|
/**
|
|
* devm_pm_opp_set_clkname() - Set clk name for the device
|
|
* @dev: Device for which clk name is being set.
|
|
* @name: Clk name.
|
|
*
|
|
* This is a resource-managed variant of dev_pm_opp_set_clkname().
|
|
*
|
|
* Return: 0 on success and errorno otherwise.
|
|
*/
|
|
int devm_pm_opp_set_clkname(struct device *dev, const char *name)
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = dev_pm_opp_set_clkname(dev, name);
|
|
if (IS_ERR(opp_table))
|
|
return PTR_ERR(opp_table);
|
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_clkname_release,
|
|
opp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_opp_set_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 dev_pm_set_opp_data *data;
|
|
struct opp_table *opp_table;
|
|
|
|
if (!set_opp)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
opp_table = _add_opp_table(dev, false);
|
|
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)
|
|
return opp_table;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
opp_table->set_opp_data = data;
|
|
if (opp_table->sod_supplies) {
|
|
data->old_opp.supplies = opp_table->sod_supplies;
|
|
data->new_opp.supplies = opp_table->sod_supplies +
|
|
opp_table->regulator_count;
|
|
}
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
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)
|
|
{
|
|
if (unlikely(!opp_table))
|
|
return;
|
|
|
|
opp_table->set_opp = NULL;
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
kfree(opp_table->set_opp_data);
|
|
opp_table->set_opp_data = NULL;
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
|
|
|
|
static void devm_pm_opp_unregister_set_opp_helper(void *data)
|
|
{
|
|
dev_pm_opp_unregister_set_opp_helper(data);
|
|
}
|
|
|
|
/**
|
|
* devm_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 a resource-managed version of dev_pm_opp_register_set_opp_helper().
|
|
*
|
|
* Return: 0 on success and errorno otherwise.
|
|
*/
|
|
int devm_pm_opp_register_set_opp_helper(struct device *dev,
|
|
int (*set_opp)(struct dev_pm_set_opp_data *data))
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = dev_pm_opp_register_set_opp_helper(dev, set_opp);
|
|
if (IS_ERR(opp_table))
|
|
return PTR_ERR(opp_table);
|
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_unregister_set_opp_helper,
|
|
opp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_opp_register_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 * const *names, struct device ***virt_devs)
|
|
{
|
|
struct opp_table *opp_table;
|
|
struct device *virt_dev;
|
|
int index = 0, ret = -EINVAL;
|
|
const char * const *name = names;
|
|
|
|
opp_table = _add_opp_table(dev, false);
|
|
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)
|
|
{
|
|
if (unlikely(!opp_table))
|
|
return;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
static void devm_pm_opp_detach_genpd(void *data)
|
|
{
|
|
dev_pm_opp_detach_genpd(data);
|
|
}
|
|
|
|
/**
|
|
* devm_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.
|
|
*
|
|
* This is a resource-managed version of dev_pm_opp_attach_genpd().
|
|
*
|
|
* Return: 0 on success and errorno otherwise.
|
|
*/
|
|
int devm_pm_opp_attach_genpd(struct device *dev, const char * const *names,
|
|
struct device ***virt_devs)
|
|
{
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = dev_pm_opp_attach_genpd(dev, names, virt_devs);
|
|
if (IS_ERR(opp_table))
|
|
return PTR_ERR(opp_table);
|
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_detach_genpd,
|
|
opp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd);
|
|
|
|
/**
|
|
* dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP.
|
|
* @src_table: OPP table which has @dst_table as one of its required OPP table.
|
|
* @dst_table: Required OPP table of the @src_table.
|
|
* @src_opp: OPP from the @src_table.
|
|
*
|
|
* This function returns the OPP (present in @dst_table) pointed out by the
|
|
* "required-opps" property of the @src_opp (present in @src_table).
|
|
*
|
|
* The callers are required to call dev_pm_opp_put() for the returned OPP after
|
|
* use.
|
|
*
|
|
* Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise.
|
|
*/
|
|
struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
|
|
struct opp_table *dst_table,
|
|
struct dev_pm_opp *src_opp)
|
|
{
|
|
struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV);
|
|
int i;
|
|
|
|
if (!src_table || !dst_table || !src_opp ||
|
|
!src_table->required_opp_tables)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* required-opps not fully initialized yet */
|
|
if (lazy_linking_pending(src_table))
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
for (i = 0; i < src_table->required_opp_count; i++) {
|
|
if (src_table->required_opp_tables[i] == dst_table) {
|
|
mutex_lock(&src_table->lock);
|
|
|
|
list_for_each_entry(opp, &src_table->opp_list, node) {
|
|
if (opp == src_opp) {
|
|
dest_opp = opp->required_opps[i];
|
|
dev_pm_opp_get(dest_opp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&src_table->lock);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (IS_ERR(dest_opp)) {
|
|
pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__,
|
|
src_table, dst_table);
|
|
}
|
|
|
|
return dest_opp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp);
|
|
|
|
/**
|
|
* 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 || !src_table->required_opp_count)
|
|
return pstate;
|
|
|
|
/* required-opps not fully initialized yet */
|
|
if (lazy_linking_pending(src_table))
|
|
return -EBUSY;
|
|
|
|
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 = _add_opp_table(dev, true);
|
|
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);
|
|
|
|
/**
|
|
* dev_pm_opp_sync_regulators() - Sync state of voltage regulators
|
|
* @dev: device for which we do this operation
|
|
*
|
|
* Sync voltage state of the OPP table regulators.
|
|
*
|
|
* Return: 0 on success or a negative error value.
|
|
*/
|
|
int dev_pm_opp_sync_regulators(struct device *dev)
|
|
{
|
|
struct opp_table *opp_table;
|
|
struct regulator *reg;
|
|
int i, ret = 0;
|
|
|
|
/* Device may not have OPP table */
|
|
opp_table = _find_opp_table(dev);
|
|
if (IS_ERR(opp_table))
|
|
return 0;
|
|
|
|
/* Regulator may not be required for the device */
|
|
if (unlikely(!opp_table->regulators))
|
|
goto put_table;
|
|
|
|
/* Nothing to sync if voltage wasn't changed */
|
|
if (!opp_table->enabled)
|
|
goto put_table;
|
|
|
|
for (i = 0; i < opp_table->regulator_count; i++) {
|
|
reg = opp_table->regulators[i];
|
|
ret = regulator_sync_voltage(reg);
|
|
if (ret)
|
|
break;
|
|
}
|
|
put_table:
|
|
/* Drop reference taken by _find_opp_table() */
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);
|