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d36cb843e4
smatch complains that 'ret' may be returned un-initialized.
Explicitly return 0 if we reach the end of the function (should
'opp_table->clk_count' be 0).
Fixes: 8174a3a613 ("OPP: Provide a simple implementation to configure multiple clocks")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
3081 lines
81 KiB
C
3081 lines
81 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic OPP Interface
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/clk.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/pm_domain.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/xarray.h>
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#include "opp.h"
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/*
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* The root of the list of all opp-tables. All opp_table structures branch off
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* from here, with each opp_table containing the list of opps it supports in
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* various states of availability.
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*/
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LIST_HEAD(opp_tables);
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/* OPP tables with uninitialized required OPPs */
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LIST_HEAD(lazy_opp_tables);
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/* Lock to allow exclusive modification to the device and opp lists */
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DEFINE_MUTEX(opp_table_lock);
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/* Flag indicating that opp_tables list is being updated at the moment */
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static bool opp_tables_busy;
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/* OPP ID allocator */
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static DEFINE_XARRAY_ALLOC1(opp_configs);
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static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table)
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{
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struct opp_device *opp_dev;
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bool found = false;
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mutex_lock(&opp_table->lock);
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list_for_each_entry(opp_dev, &opp_table->dev_list, node)
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if (opp_dev->dev == dev) {
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found = true;
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break;
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}
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mutex_unlock(&opp_table->lock);
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return found;
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}
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static struct opp_table *_find_opp_table_unlocked(struct device *dev)
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{
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struct opp_table *opp_table;
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list_for_each_entry(opp_table, &opp_tables, node) {
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if (_find_opp_dev(dev, opp_table)) {
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_get_opp_table_kref(opp_table);
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return opp_table;
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}
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}
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return ERR_PTR(-ENODEV);
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}
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/**
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* _find_opp_table() - find opp_table struct using device pointer
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* @dev: device pointer used to lookup OPP table
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*
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* Search OPP table for one containing matching device.
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*
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* Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
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* -EINVAL based on type of error.
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*
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* The callers must call dev_pm_opp_put_opp_table() after the table is used.
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*/
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struct opp_table *_find_opp_table(struct device *dev)
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{
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struct opp_table *opp_table;
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if (IS_ERR_OR_NULL(dev)) {
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pr_err("%s: Invalid parameters\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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mutex_lock(&opp_table_lock);
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opp_table = _find_opp_table_unlocked(dev);
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mutex_unlock(&opp_table_lock);
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return opp_table;
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}
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/*
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* Returns true if multiple clocks aren't there, else returns false with WARN.
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*
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* We don't force clk_count == 1 here as there are users who don't have a clock
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* representation in the OPP table and manage the clock configuration themselves
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* in an platform specific way.
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*/
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static bool assert_single_clk(struct opp_table *opp_table)
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{
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return !WARN_ON(opp_table->clk_count > 1);
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}
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/**
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* dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
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* @opp: opp for which voltage has to be returned for
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*
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* Return: voltage in micro volt corresponding to the opp, else
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* return 0
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*
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* This is useful only for devices with single power supply.
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*/
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unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
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{
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if (IS_ERR_OR_NULL(opp)) {
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pr_err("%s: Invalid parameters\n", __func__);
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return 0;
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}
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return opp->supplies[0].u_volt;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
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/**
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* dev_pm_opp_get_supplies() - Gets the supply information corresponding to an opp
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* @opp: opp for which voltage has to be returned for
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* @supplies: Placeholder for copying the supply information.
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*
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* Return: negative error number on failure, 0 otherwise on success after
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* setting @supplies.
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*
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* This can be used for devices with any number of power supplies. The caller
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* must ensure the @supplies array must contain space for each regulator.
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*/
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int dev_pm_opp_get_supplies(struct dev_pm_opp *opp,
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struct dev_pm_opp_supply *supplies)
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{
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if (IS_ERR_OR_NULL(opp) || !supplies) {
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pr_err("%s: Invalid parameters\n", __func__);
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return -EINVAL;
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}
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memcpy(supplies, opp->supplies,
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sizeof(*supplies) * opp->opp_table->regulator_count);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_supplies);
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/**
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* dev_pm_opp_get_power() - Gets the power corresponding to an opp
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* @opp: opp for which power has to be returned for
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*
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* Return: power in micro watt corresponding to the opp, else
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* return 0
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*
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* This is useful only for devices with single power supply.
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*/
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unsigned long dev_pm_opp_get_power(struct dev_pm_opp *opp)
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{
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unsigned long opp_power = 0;
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int i;
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if (IS_ERR_OR_NULL(opp)) {
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pr_err("%s: Invalid parameters\n", __func__);
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return 0;
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}
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for (i = 0; i < opp->opp_table->regulator_count; i++)
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opp_power += opp->supplies[i].u_watt;
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return opp_power;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_power);
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/**
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* dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
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* @opp: opp for which frequency has to be returned for
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*
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* Return: frequency in hertz corresponding to the opp, else
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* return 0
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*/
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unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
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{
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if (IS_ERR_OR_NULL(opp)) {
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pr_err("%s: Invalid parameters\n", __func__);
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return 0;
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}
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if (!assert_single_clk(opp->opp_table))
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return 0;
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return opp->rates[0];
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
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/**
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* dev_pm_opp_get_level() - Gets the level corresponding to an available opp
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* @opp: opp for which level value has to be returned for
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*
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* Return: level read from device tree corresponding to the opp, else
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* return 0.
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*/
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unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
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{
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if (IS_ERR_OR_NULL(opp) || !opp->available) {
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pr_err("%s: Invalid parameters\n", __func__);
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return 0;
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}
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return opp->level;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
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/**
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* dev_pm_opp_get_required_pstate() - Gets the required performance state
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* corresponding to an available opp
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* @opp: opp for which performance state has to be returned for
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* @index: index of the required opp
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*
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* Return: performance state read from device tree corresponding to the
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* required opp, else return 0.
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*/
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unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
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unsigned int index)
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{
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if (IS_ERR_OR_NULL(opp) || !opp->available ||
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index >= opp->opp_table->required_opp_count) {
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pr_err("%s: Invalid parameters\n", __func__);
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return 0;
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}
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/* required-opps not fully initialized yet */
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if (lazy_linking_pending(opp->opp_table))
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return 0;
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return opp->required_opps[index]->pstate;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
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/**
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* dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
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* @opp: opp for which turbo mode is being verified
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*
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* Turbo OPPs are not for normal use, and can be enabled (under certain
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* conditions) for short duration of times to finish high throughput work
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* quickly. Running on them for longer times may overheat the chip.
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*
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* Return: true if opp is turbo opp, else false.
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*/
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bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
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{
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if (IS_ERR_OR_NULL(opp) || !opp->available) {
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pr_err("%s: Invalid parameters\n", __func__);
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return false;
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}
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return opp->turbo;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
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/**
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* dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
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* @dev: device for which we do this operation
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*
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* Return: This function returns the max clock latency in nanoseconds.
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*/
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unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
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{
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struct opp_table *opp_table;
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unsigned long clock_latency_ns;
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opp_table = _find_opp_table(dev);
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if (IS_ERR(opp_table))
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return 0;
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clock_latency_ns = opp_table->clock_latency_ns_max;
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dev_pm_opp_put_opp_table(opp_table);
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return clock_latency_ns;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
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/**
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* dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
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* @dev: device for which we do this operation
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*
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* Return: This function returns the max voltage latency in nanoseconds.
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*/
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unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
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{
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struct opp_table *opp_table;
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struct dev_pm_opp *opp;
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struct regulator *reg;
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unsigned long latency_ns = 0;
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int ret, i, count;
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struct {
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unsigned long min;
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unsigned long max;
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} *uV;
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opp_table = _find_opp_table(dev);
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if (IS_ERR(opp_table))
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return 0;
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/* Regulator may not be required for the device */
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if (!opp_table->regulators)
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goto put_opp_table;
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count = opp_table->regulator_count;
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uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
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if (!uV)
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goto put_opp_table;
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mutex_lock(&opp_table->lock);
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for (i = 0; i < count; i++) {
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uV[i].min = ~0;
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uV[i].max = 0;
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list_for_each_entry(opp, &opp_table->opp_list, node) {
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if (!opp->available)
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continue;
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if (opp->supplies[i].u_volt_min < uV[i].min)
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uV[i].min = opp->supplies[i].u_volt_min;
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if (opp->supplies[i].u_volt_max > uV[i].max)
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uV[i].max = opp->supplies[i].u_volt_max;
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}
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}
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mutex_unlock(&opp_table->lock);
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/*
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* The caller needs to ensure that opp_table (and hence the regulator)
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* isn't freed, while we are executing this routine.
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*/
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for (i = 0; i < count; i++) {
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reg = opp_table->regulators[i];
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ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
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if (ret > 0)
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latency_ns += ret * 1000;
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}
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kfree(uV);
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put_opp_table:
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dev_pm_opp_put_opp_table(opp_table);
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return latency_ns;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
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/**
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* dev_pm_opp_get_max_transition_latency() - Get max transition latency in
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* nanoseconds
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* @dev: device for which we do this operation
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*
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* Return: This function returns the max transition latency, in nanoseconds, to
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* switch from one OPP to other.
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*/
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unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
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{
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return dev_pm_opp_get_max_volt_latency(dev) +
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dev_pm_opp_get_max_clock_latency(dev);
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
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/**
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* dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
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* @dev: device for which we do this operation
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*
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* Return: This function returns the frequency of the OPP marked as suspend_opp
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* if one is available, else returns 0;
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*/
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unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
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{
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struct opp_table *opp_table;
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unsigned long freq = 0;
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opp_table = _find_opp_table(dev);
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if (IS_ERR(opp_table))
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return 0;
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if (opp_table->suspend_opp && opp_table->suspend_opp->available)
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freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
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dev_pm_opp_put_opp_table(opp_table);
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return freq;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
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int _get_opp_count(struct opp_table *opp_table)
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{
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struct dev_pm_opp *opp;
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int count = 0;
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mutex_lock(&opp_table->lock);
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list_for_each_entry(opp, &opp_table->opp_list, node) {
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if (opp->available)
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count++;
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}
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mutex_unlock(&opp_table->lock);
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return count;
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}
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/**
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* dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
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* @dev: device for which we do this operation
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*
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* Return: This function returns the number of available opps if there are any,
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* else returns 0 if none or the corresponding error value.
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*/
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int dev_pm_opp_get_opp_count(struct device *dev)
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{
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struct opp_table *opp_table;
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int count;
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opp_table = _find_opp_table(dev);
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if (IS_ERR(opp_table)) {
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count = PTR_ERR(opp_table);
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dev_dbg(dev, "%s: OPP table not found (%d)\n",
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__func__, count);
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return count;
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}
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count = _get_opp_count(opp_table);
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dev_pm_opp_put_opp_table(opp_table);
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return count;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
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/* Helpers to read keys */
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static unsigned long _read_freq(struct dev_pm_opp *opp, int index)
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{
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return opp->rates[0];
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}
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static unsigned long _read_level(struct dev_pm_opp *opp, int index)
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{
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return opp->level;
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}
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static unsigned long _read_bw(struct dev_pm_opp *opp, int index)
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{
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return opp->bandwidth[index].peak;
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}
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/* Generic comparison helpers */
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static bool _compare_exact(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
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unsigned long opp_key, unsigned long key)
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{
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if (opp_key == key) {
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*opp = temp_opp;
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return true;
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}
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return false;
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}
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static bool _compare_ceil(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
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unsigned long opp_key, unsigned long key)
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{
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if (opp_key >= key) {
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*opp = temp_opp;
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return true;
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}
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return false;
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}
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static bool _compare_floor(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
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unsigned long opp_key, unsigned long key)
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{
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if (opp_key > key)
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return true;
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*opp = temp_opp;
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return false;
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}
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/* Generic key finding helpers */
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static struct dev_pm_opp *_opp_table_find_key(struct opp_table *opp_table,
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unsigned long *key, int index, bool available,
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unsigned long (*read)(struct dev_pm_opp *opp, int index),
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bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
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unsigned long opp_key, unsigned long key),
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bool (*assert)(struct opp_table *opp_table))
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{
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struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
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/* Assert that the requirement is met */
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if (assert && !assert(opp_table))
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return ERR_PTR(-EINVAL);
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mutex_lock(&opp_table->lock);
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list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
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if (temp_opp->available == available) {
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if (compare(&opp, temp_opp, read(temp_opp, index), *key))
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break;
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}
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}
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/* Increment the reference count of OPP */
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if (!IS_ERR(opp)) {
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*key = read(opp, index);
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dev_pm_opp_get(opp);
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}
|
|
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
return opp;
|
|
}
|
|
|
|
static struct dev_pm_opp *
|
|
_find_key(struct device *dev, unsigned long *key, int index, bool available,
|
|
unsigned long (*read)(struct dev_pm_opp *opp, int index),
|
|
bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
|
|
unsigned long opp_key, unsigned long key),
|
|
bool (*assert)(struct opp_table *opp_table))
|
|
{
|
|
struct opp_table *opp_table;
|
|
struct dev_pm_opp *opp;
|
|
|
|
opp_table = _find_opp_table(dev);
|
|
if (IS_ERR(opp_table)) {
|
|
dev_err(dev, "%s: OPP table not found (%ld)\n", __func__,
|
|
PTR_ERR(opp_table));
|
|
return ERR_CAST(opp_table);
|
|
}
|
|
|
|
opp = _opp_table_find_key(opp_table, key, index, available, read,
|
|
compare, assert);
|
|
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
|
|
return opp;
|
|
}
|
|
|
|
static struct dev_pm_opp *_find_key_exact(struct device *dev,
|
|
unsigned long key, int index, bool available,
|
|
unsigned long (*read)(struct dev_pm_opp *opp, int index),
|
|
bool (*assert)(struct opp_table *opp_table))
|
|
{
|
|
/*
|
|
* The value of key will be updated here, but will be ignored as the
|
|
* caller doesn't need it.
|
|
*/
|
|
return _find_key(dev, &key, index, available, read, _compare_exact,
|
|
assert);
|
|
}
|
|
|
|
static struct dev_pm_opp *_opp_table_find_key_ceil(struct opp_table *opp_table,
|
|
unsigned long *key, int index, bool available,
|
|
unsigned long (*read)(struct dev_pm_opp *opp, int index),
|
|
bool (*assert)(struct opp_table *opp_table))
|
|
{
|
|
return _opp_table_find_key(opp_table, key, index, available, read,
|
|
_compare_ceil, assert);
|
|
}
|
|
|
|
static struct dev_pm_opp *_find_key_ceil(struct device *dev, unsigned long *key,
|
|
int index, bool available,
|
|
unsigned long (*read)(struct dev_pm_opp *opp, int index),
|
|
bool (*assert)(struct opp_table *opp_table))
|
|
{
|
|
return _find_key(dev, key, index, available, read, _compare_ceil,
|
|
assert);
|
|
}
|
|
|
|
static struct dev_pm_opp *_find_key_floor(struct device *dev,
|
|
unsigned long *key, int index, bool available,
|
|
unsigned long (*read)(struct dev_pm_opp *opp, int index),
|
|
bool (*assert)(struct opp_table *opp_table))
|
|
{
|
|
return _find_key(dev, key, index, available, read, _compare_floor,
|
|
assert);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return _find_key_exact(dev, freq, 0, available, _read_freq,
|
|
assert_single_clk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
|
|
|
|
static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
|
|
unsigned long *freq)
|
|
{
|
|
return _opp_table_find_key_ceil(opp_table, freq, 0, true, _read_freq,
|
|
assert_single_clk);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return _find_key_ceil(dev, freq, 0, true, _read_freq, assert_single_clk);
|
|
}
|
|
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)
|
|
{
|
|
return _find_key_floor(dev, freq, 0, true, _read_freq, assert_single_clk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return _find_key_exact(dev, level, 0, true, _read_level, NULL);
|
|
}
|
|
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)
|
|
{
|
|
unsigned long temp = *level;
|
|
struct dev_pm_opp *opp;
|
|
|
|
opp = _find_key_ceil(dev, &temp, 0, true, _read_level, NULL);
|
|
*level = temp;
|
|
return opp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
|
|
|
|
/**
|
|
* dev_pm_opp_find_bw_ceil() - Search for a rounded ceil bandwidth
|
|
* @dev: device for which we do this operation
|
|
* @bw: start bandwidth
|
|
* @index: which bandwidth to compare, in case of OPPs with several values
|
|
*
|
|
* Search for the matching floor *available* OPP from a starting bandwidth
|
|
* for a device.
|
|
*
|
|
* Return: matching *opp and refreshes *bw 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_bw_ceil(struct device *dev, unsigned int *bw,
|
|
int index)
|
|
{
|
|
unsigned long temp = *bw;
|
|
struct dev_pm_opp *opp;
|
|
|
|
opp = _find_key_ceil(dev, &temp, index, true, _read_bw, NULL);
|
|
*bw = temp;
|
|
return opp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_ceil);
|
|
|
|
/**
|
|
* dev_pm_opp_find_bw_floor() - Search for a rounded floor bandwidth
|
|
* @dev: device for which we do this operation
|
|
* @bw: start bandwidth
|
|
* @index: which bandwidth to compare, in case of OPPs with several values
|
|
*
|
|
* Search for the matching floor *available* OPP from a starting bandwidth
|
|
* for a device.
|
|
*
|
|
* Return: matching *opp and refreshes *bw 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_bw_floor(struct device *dev,
|
|
unsigned int *bw, int index)
|
|
{
|
|
unsigned long temp = *bw;
|
|
struct dev_pm_opp *opp;
|
|
|
|
opp = _find_key_floor(dev, &temp, index, true, _read_bw, NULL);
|
|
*bw = temp;
|
|
return opp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_floor);
|
|
|
|
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 int
|
|
_opp_config_clk_single(struct device *dev, struct opp_table *opp_table,
|
|
struct dev_pm_opp *opp, void *data, bool scaling_down)
|
|
{
|
|
unsigned long *target = data;
|
|
unsigned long freq;
|
|
int ret;
|
|
|
|
/* One of target and opp must be available */
|
|
if (target) {
|
|
freq = *target;
|
|
} else if (opp) {
|
|
freq = opp->rates[0];
|
|
} else {
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = clk_set_rate(opp_table->clk, freq);
|
|
if (ret) {
|
|
dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
|
|
ret);
|
|
} else {
|
|
opp_table->rate_clk_single = freq;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Simple implementation for configuring multiple clocks. Configure clocks in
|
|
* the order in which they are present in the array while scaling up.
|
|
*/
|
|
int dev_pm_opp_config_clks_simple(struct device *dev,
|
|
struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
|
|
bool scaling_down)
|
|
{
|
|
int ret, i;
|
|
|
|
if (scaling_down) {
|
|
for (i = opp_table->clk_count - 1; i >= 0; i--) {
|
|
ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
|
|
if (ret) {
|
|
dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
} else {
|
|
for (i = 0; i < opp_table->clk_count; i++) {
|
|
ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
|
|
if (ret) {
|
|
dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_config_clks_simple);
|
|
|
|
static int _opp_config_regulator_single(struct device *dev,
|
|
struct dev_pm_opp *old_opp, struct dev_pm_opp *new_opp,
|
|
struct regulator **regulators, unsigned int count)
|
|
{
|
|
struct regulator *reg = regulators[0];
|
|
int ret;
|
|
|
|
/* This function only supports single regulator per device */
|
|
if (WARN_ON(count > 1)) {
|
|
dev_err(dev, "multiple regulators are not supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = _set_opp_voltage(dev, reg, new_opp->supplies);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Enable the regulator after setting its voltages, otherwise it breaks
|
|
* some boot-enabled regulators.
|
|
*/
|
|
if (unlikely(!new_opp->opp_table->enabled)) {
|
|
ret = regulator_enable(reg);
|
|
if (ret < 0)
|
|
dev_warn(dev, "Failed to enable regulator: %d", ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_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 state 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, void *clk_data, bool forced)
|
|
{
|
|
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 (!forced && old_opp == opp && 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__, old_opp->rates[0], opp->rates[0], 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(opp_table, 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->config_regulators) {
|
|
ret = opp_table->config_regulators(dev, old_opp, opp,
|
|
opp_table->regulators,
|
|
opp_table->regulator_count);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to set regulator voltages: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (opp_table->config_clks) {
|
|
ret = opp_table->config_clks(dev, opp_table, opp, clk_data, scaling_down);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* Scaling down? Configure required OPPs after frequency */
|
|
if (scaling_down) {
|
|
if (opp_table->config_regulators) {
|
|
ret = opp_table->config_regulators(dev, old_opp, opp,
|
|
opp_table->regulators,
|
|
opp_table->regulator_count);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to set regulator voltages: %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;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
bool forced = false;
|
|
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 = opp_table->config_clks(dev, opp_table, NULL,
|
|
&target_freq, false);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* An OPP entry specifies the highest frequency at which other
|
|
* properties of the OPP entry apply. Even if the new OPP is
|
|
* same as the old one, we may still reach here for a different
|
|
* value of the frequency. In such a case, do not abort but
|
|
* configure the hardware to the desired frequency forcefully.
|
|
*/
|
|
forced = opp_table->rate_clk_single != target_freq;
|
|
}
|
|
|
|
ret = _set_opp(dev, opp_table, opp, &target_freq, forced);
|
|
|
|
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, NULL, false);
|
|
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);
|
|
|
|
opp_table->clk = ERR_PTR(-ENODEV);
|
|
|
|
/* 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 done it
|
|
* earlier.
|
|
*/
|
|
if (!getclk || IS_ERR(opp_table) || !IS_ERR(opp_table->clk) ||
|
|
opp_table->clks)
|
|
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) {
|
|
opp_table->config_clks = _opp_config_clk_single;
|
|
opp_table->clk_count = 1;
|
|
return opp_table;
|
|
}
|
|
|
|
if (ret == -ENOENT) {
|
|
/*
|
|
* There are few platforms which don't want the OPP core to
|
|
* manage device's clock settings. In such cases neither the
|
|
* platform provides the clks explicitly to us, nor the DT
|
|
* contains a valid clk entry. The OPP nodes in DT may still
|
|
* contain "opp-hz" property though, which we need to parse and
|
|
* allow the platform to find an OPP based on freq later on.
|
|
*
|
|
* This is a simple solution to take care of such corner cases,
|
|
* i.e. make the clk_count 1, which lets us allocate space for
|
|
* frequency in opp->rates and also parse the entries in DT.
|
|
*/
|
|
opp_table->clk_count = 1;
|
|
|
|
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 automatically acquired single 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_clear_opp(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 = NULL, *iter;
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = _find_opp_table(dev);
|
|
if (IS_ERR(opp_table))
|
|
return;
|
|
|
|
if (!assert_single_clk(opp_table))
|
|
goto put_table;
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
|
|
list_for_each_entry(iter, &opp_table->opp_list, node) {
|
|
if (iter->rates[0] == freq) {
|
|
opp = iter;
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
if (opp) {
|
|
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);
|
|
}
|
|
|
|
put_table:
|
|
/* 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 *opp_table)
|
|
{
|
|
struct dev_pm_opp *opp;
|
|
int supply_count, supply_size, icc_size, clk_size;
|
|
|
|
/* Allocate space for at least one supply */
|
|
supply_count = opp_table->regulator_count > 0 ?
|
|
opp_table->regulator_count : 1;
|
|
supply_size = sizeof(*opp->supplies) * supply_count;
|
|
clk_size = sizeof(*opp->rates) * opp_table->clk_count;
|
|
icc_size = sizeof(*opp->bandwidth) * opp_table->path_count;
|
|
|
|
/* allocate new OPP node and supplies structures */
|
|
opp = kzalloc(sizeof(*opp) + supply_size + clk_size + icc_size, GFP_KERNEL);
|
|
if (!opp)
|
|
return NULL;
|
|
|
|
/* Put the supplies, bw and clock at the end of the OPP structure */
|
|
opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
|
|
|
|
opp->rates = (unsigned long *)(opp->supplies + supply_count);
|
|
|
|
if (icc_size)
|
|
opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->rates + opp_table->clk_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;
|
|
}
|
|
|
|
static int _opp_compare_rate(struct opp_table *opp_table,
|
|
struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < opp_table->clk_count; i++) {
|
|
if (opp1->rates[i] != opp2->rates[i])
|
|
return opp1->rates[i] < opp2->rates[i] ? -1 : 1;
|
|
}
|
|
|
|
/* Same rates for both OPPs */
|
|
return 0;
|
|
}
|
|
|
|
static int _opp_compare_bw(struct opp_table *opp_table, struct dev_pm_opp *opp1,
|
|
struct dev_pm_opp *opp2)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < opp_table->path_count; i++) {
|
|
if (opp1->bandwidth[i].peak != opp2->bandwidth[i].peak)
|
|
return opp1->bandwidth[i].peak < opp2->bandwidth[i].peak ? -1 : 1;
|
|
}
|
|
|
|
/* Same bw for both OPPs */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns
|
|
* 0: opp1 == opp2
|
|
* 1: opp1 > opp2
|
|
* -1: opp1 < opp2
|
|
*/
|
|
int _opp_compare_key(struct opp_table *opp_table, struct dev_pm_opp *opp1,
|
|
struct dev_pm_opp *opp2)
|
|
{
|
|
int ret;
|
|
|
|
ret = _opp_compare_rate(opp_table, opp1, opp2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = _opp_compare_bw(opp_table, opp1, opp2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (opp1->level != opp2->level)
|
|
return opp1->level < opp2->level ? -1 : 1;
|
|
|
|
/* Duplicate OPPs */
|
|
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(opp_table, 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->rates[0], opp->supplies[0].u_volt,
|
|
opp->available, new_opp->rates[0],
|
|
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->rates[0]);
|
|
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)
|
|
{
|
|
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->rates[0]);
|
|
}
|
|
|
|
/* 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;
|
|
|
|
if (!assert_single_clk(opp_table))
|
|
return -EINVAL;
|
|
|
|
new_opp = _opp_allocate(opp_table);
|
|
if (!new_opp)
|
|
return -ENOMEM;
|
|
|
|
/* populate the opp table */
|
|
new_opp->rates[0] = 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);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* _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.
|
|
*/
|
|
static int _opp_set_supported_hw(struct opp_table *opp_table,
|
|
const u32 *versions, unsigned int count)
|
|
{
|
|
/* Another CPU that shares the OPP table has set the property ? */
|
|
if (opp_table->supported_hw)
|
|
return 0;
|
|
|
|
opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
|
|
GFP_KERNEL);
|
|
if (!opp_table->supported_hw)
|
|
return -ENOMEM;
|
|
|
|
opp_table->supported_hw_count = count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* _opp_put_supported_hw() - Releases resources blocked for supported hw
|
|
* @opp_table: OPP table returned by _opp_set_supported_hw().
|
|
*
|
|
* This is required only for the V2 bindings, and is called for a matching
|
|
* _opp_set_supported_hw(). Until this is called, the opp_table structure
|
|
* will not be freed.
|
|
*/
|
|
static void _opp_put_supported_hw(struct opp_table *opp_table)
|
|
{
|
|
if (opp_table->supported_hw) {
|
|
kfree(opp_table->supported_hw);
|
|
opp_table->supported_hw = NULL;
|
|
opp_table->supported_hw_count = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* _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.
|
|
*/
|
|
static int _opp_set_prop_name(struct opp_table *opp_table, const char *name)
|
|
{
|
|
/* Another CPU that shares the OPP table has set the property ? */
|
|
if (!opp_table->prop_name) {
|
|
opp_table->prop_name = kstrdup(name, GFP_KERNEL);
|
|
if (!opp_table->prop_name)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* _opp_put_prop_name() - Releases resources blocked for prop-name
|
|
* @opp_table: OPP table returned by _opp_set_prop_name().
|
|
*
|
|
* This is required only for the V2 bindings, and is called for a matching
|
|
* _opp_set_prop_name(). Until this is called, the opp_table structure
|
|
* will not be freed.
|
|
*/
|
|
static void _opp_put_prop_name(struct opp_table *opp_table)
|
|
{
|
|
if (opp_table->prop_name) {
|
|
kfree(opp_table->prop_name);
|
|
opp_table->prop_name = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* _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.
|
|
*/
|
|
static int _opp_set_regulators(struct opp_table *opp_table, struct device *dev,
|
|
const char * const names[])
|
|
{
|
|
const char * const *temp = names;
|
|
struct regulator *reg;
|
|
int count = 0, ret, i;
|
|
|
|
/* Count number of regulators */
|
|
while (*temp++)
|
|
count++;
|
|
|
|
if (!count)
|
|
return -EINVAL;
|
|
|
|
/* Another CPU that shares the OPP table has set the regulators ? */
|
|
if (opp_table->regulators)
|
|
return 0;
|
|
|
|
opp_table->regulators = kmalloc_array(count,
|
|
sizeof(*opp_table->regulators),
|
|
GFP_KERNEL);
|
|
if (!opp_table->regulators)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
reg = regulator_get_optional(dev, names[i]);
|
|
if (IS_ERR(reg)) {
|
|
ret = dev_err_probe(dev, PTR_ERR(reg),
|
|
"%s: no regulator (%s) found\n",
|
|
__func__, names[i]);
|
|
goto free_regulators;
|
|
}
|
|
|
|
opp_table->regulators[i] = reg;
|
|
}
|
|
|
|
opp_table->regulator_count = count;
|
|
|
|
/* Set generic config_regulators() for single regulators here */
|
|
if (count == 1)
|
|
opp_table->config_regulators = _opp_config_regulator_single;
|
|
|
|
return 0;
|
|
|
|
free_regulators:
|
|
while (i != 0)
|
|
regulator_put(opp_table->regulators[--i]);
|
|
|
|
kfree(opp_table->regulators);
|
|
opp_table->regulators = NULL;
|
|
opp_table->regulator_count = -1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* _opp_put_regulators() - Releases resources blocked for regulator
|
|
* @opp_table: OPP table returned from _opp_set_regulators().
|
|
*/
|
|
static void _opp_put_regulators(struct opp_table *opp_table)
|
|
{
|
|
int i;
|
|
|
|
if (!opp_table->regulators)
|
|
return;
|
|
|
|
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]);
|
|
|
|
kfree(opp_table->regulators);
|
|
opp_table->regulators = NULL;
|
|
opp_table->regulator_count = -1;
|
|
}
|
|
|
|
static void _put_clks(struct opp_table *opp_table, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = count - 1; i >= 0; i--)
|
|
clk_put(opp_table->clks[i]);
|
|
|
|
kfree(opp_table->clks);
|
|
opp_table->clks = NULL;
|
|
}
|
|
|
|
/**
|
|
* _opp_set_clknames() - Set clk names for the device
|
|
* @dev: Device for which clk names is being set.
|
|
* @names: Clk names.
|
|
*
|
|
* In order to support OPP switching, OPP layer needs to get pointers to the
|
|
* clocks 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 names of the clks to
|
|
* use.
|
|
*
|
|
* This must be called before any OPPs are initialized for the device.
|
|
*/
|
|
static int _opp_set_clknames(struct opp_table *opp_table, struct device *dev,
|
|
const char * const names[],
|
|
config_clks_t config_clks)
|
|
{
|
|
const char * const *temp = names;
|
|
int count = 0, ret, i;
|
|
struct clk *clk;
|
|
|
|
/* Count number of clks */
|
|
while (*temp++)
|
|
count++;
|
|
|
|
/*
|
|
* This is a special case where we have a single clock, whose connection
|
|
* id name is NULL, i.e. first two entries are NULL in the array.
|
|
*/
|
|
if (!count && !names[1])
|
|
count = 1;
|
|
|
|
/* Fail early for invalid configurations */
|
|
if (!count || (!config_clks && count > 1))
|
|
return -EINVAL;
|
|
|
|
/* Another CPU that shares the OPP table has set the clkname ? */
|
|
if (opp_table->clks)
|
|
return 0;
|
|
|
|
opp_table->clks = kmalloc_array(count, sizeof(*opp_table->clks),
|
|
GFP_KERNEL);
|
|
if (!opp_table->clks)
|
|
return -ENOMEM;
|
|
|
|
/* Find clks for the device */
|
|
for (i = 0; i < count; i++) {
|
|
clk = clk_get(dev, names[i]);
|
|
if (IS_ERR(clk)) {
|
|
ret = dev_err_probe(dev, PTR_ERR(clk),
|
|
"%s: Couldn't find clock with name: %s\n",
|
|
__func__, names[i]);
|
|
goto free_clks;
|
|
}
|
|
|
|
opp_table->clks[i] = clk;
|
|
}
|
|
|
|
opp_table->clk_count = count;
|
|
opp_table->config_clks = config_clks;
|
|
|
|
/* Set generic single clk set here */
|
|
if (count == 1) {
|
|
if (!opp_table->config_clks)
|
|
opp_table->config_clks = _opp_config_clk_single;
|
|
|
|
/*
|
|
* We could have just dropped the "clk" field and used "clks"
|
|
* everywhere. Instead we kept the "clk" field around for
|
|
* following reasons:
|
|
*
|
|
* - avoiding clks[0] everywhere else.
|
|
* - not running single clk helpers for multiple clk usecase by
|
|
* mistake.
|
|
*
|
|
* Since this is single-clk case, just update the clk pointer
|
|
* too.
|
|
*/
|
|
opp_table->clk = opp_table->clks[0];
|
|
}
|
|
|
|
return 0;
|
|
|
|
free_clks:
|
|
_put_clks(opp_table, i);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* _opp_put_clknames() - Releases resources blocked for clks.
|
|
* @opp_table: OPP table returned from _opp_set_clknames().
|
|
*/
|
|
static void _opp_put_clknames(struct opp_table *opp_table)
|
|
{
|
|
if (!opp_table->clks)
|
|
return;
|
|
|
|
opp_table->config_clks = NULL;
|
|
opp_table->clk = ERR_PTR(-ENODEV);
|
|
|
|
_put_clks(opp_table, opp_table->clk_count);
|
|
}
|
|
|
|
/**
|
|
* _opp_set_config_regulators_helper() - Register custom set regulator helper.
|
|
* @dev: Device for which the helper is getting registered.
|
|
* @config_regulators: Custom set regulator helper.
|
|
*
|
|
* This is useful to support platforms with multiple regulators per device.
|
|
*
|
|
* This must be called before any OPPs are initialized for the device.
|
|
*/
|
|
static int _opp_set_config_regulators_helper(struct opp_table *opp_table,
|
|
struct device *dev, config_regulators_t config_regulators)
|
|
{
|
|
/* Another CPU that shares the OPP table has set the helper ? */
|
|
if (!opp_table->config_regulators)
|
|
opp_table->config_regulators = config_regulators;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* _opp_put_config_regulators_helper() - Releases resources blocked for
|
|
* config_regulators helper.
|
|
* @opp_table: OPP table returned from _opp_set_config_regulators_helper().
|
|
*
|
|
* Release resources blocked for platform specific config_regulators helper.
|
|
*/
|
|
static void _opp_put_config_regulators_helper(struct opp_table *opp_table)
|
|
{
|
|
if (opp_table->config_regulators)
|
|
opp_table->config_regulators = NULL;
|
|
}
|
|
|
|
static void _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;
|
|
}
|
|
|
|
/**
|
|
* _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.
|
|
*/
|
|
static int _opp_attach_genpd(struct opp_table *opp_table, struct device *dev,
|
|
const char * const *names, struct device ***virt_devs)
|
|
{
|
|
struct device *virt_dev;
|
|
int index = 0, ret = -EINVAL;
|
|
const char * const *name = names;
|
|
|
|
if (opp_table->genpd_virt_devs)
|
|
return 0;
|
|
|
|
/*
|
|
* 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)
|
|
return -EPROBE_DEFER;
|
|
|
|
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_OR_NULL(virt_dev)) {
|
|
ret = PTR_ERR(virt_dev) ? : -ENODEV;
|
|
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 0;
|
|
|
|
err:
|
|
_detach_genpd(opp_table);
|
|
unlock:
|
|
mutex_unlock(&opp_table->genpd_virt_dev_lock);
|
|
return ret;
|
|
|
|
}
|
|
|
|
/**
|
|
* _opp_detach_genpd() - Detach genpd(s) from the device.
|
|
* @opp_table: OPP table returned by _opp_attach_genpd().
|
|
*
|
|
* This detaches the genpd(s), resets the virtual device pointers, and puts the
|
|
* OPP table.
|
|
*/
|
|
static void _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);
|
|
_detach_genpd(opp_table);
|
|
mutex_unlock(&opp_table->genpd_virt_dev_lock);
|
|
}
|
|
|
|
static void _opp_clear_config(struct opp_config_data *data)
|
|
{
|
|
if (data->flags & OPP_CONFIG_GENPD)
|
|
_opp_detach_genpd(data->opp_table);
|
|
if (data->flags & OPP_CONFIG_REGULATOR)
|
|
_opp_put_regulators(data->opp_table);
|
|
if (data->flags & OPP_CONFIG_SUPPORTED_HW)
|
|
_opp_put_supported_hw(data->opp_table);
|
|
if (data->flags & OPP_CONFIG_REGULATOR_HELPER)
|
|
_opp_put_config_regulators_helper(data->opp_table);
|
|
if (data->flags & OPP_CONFIG_PROP_NAME)
|
|
_opp_put_prop_name(data->opp_table);
|
|
if (data->flags & OPP_CONFIG_CLK)
|
|
_opp_put_clknames(data->opp_table);
|
|
|
|
dev_pm_opp_put_opp_table(data->opp_table);
|
|
kfree(data);
|
|
}
|
|
|
|
/**
|
|
* dev_pm_opp_set_config() - Set OPP configuration for the device.
|
|
* @dev: Device for which configuration is being set.
|
|
* @config: OPP configuration.
|
|
*
|
|
* This allows all device OPP configurations to be performed at once.
|
|
*
|
|
* This must be called before any OPPs are initialized for the device. This may
|
|
* be called multiple times for the same OPP table, for example once for each
|
|
* CPU that share the same table. This must be balanced by the same number of
|
|
* calls to dev_pm_opp_clear_config() in order to free the OPP table properly.
|
|
*
|
|
* This returns a token to the caller, which must be passed to
|
|
* dev_pm_opp_clear_config() to free the resources later. The value of the
|
|
* returned token will be >= 1 for success and negative for errors. The minimum
|
|
* value of 1 is chosen here to make it easy for callers to manage the resource.
|
|
*/
|
|
int dev_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
|
|
{
|
|
struct opp_table *opp_table;
|
|
struct opp_config_data *data;
|
|
unsigned int id;
|
|
int ret;
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
opp_table = _add_opp_table(dev, false);
|
|
if (IS_ERR(opp_table)) {
|
|
kfree(data);
|
|
return PTR_ERR(opp_table);
|
|
}
|
|
|
|
data->opp_table = opp_table;
|
|
data->flags = 0;
|
|
|
|
/* This should be called before OPPs are initialized */
|
|
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
|
|
ret = -EBUSY;
|
|
goto err;
|
|
}
|
|
|
|
/* Configure clocks */
|
|
if (config->clk_names) {
|
|
ret = _opp_set_clknames(opp_table, dev, config->clk_names,
|
|
config->config_clks);
|
|
if (ret)
|
|
goto err;
|
|
|
|
data->flags |= OPP_CONFIG_CLK;
|
|
} else if (config->config_clks) {
|
|
/* Don't allow config callback without clocks */
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
/* Configure property names */
|
|
if (config->prop_name) {
|
|
ret = _opp_set_prop_name(opp_table, config->prop_name);
|
|
if (ret)
|
|
goto err;
|
|
|
|
data->flags |= OPP_CONFIG_PROP_NAME;
|
|
}
|
|
|
|
/* Configure config_regulators helper */
|
|
if (config->config_regulators) {
|
|
ret = _opp_set_config_regulators_helper(opp_table, dev,
|
|
config->config_regulators);
|
|
if (ret)
|
|
goto err;
|
|
|
|
data->flags |= OPP_CONFIG_REGULATOR_HELPER;
|
|
}
|
|
|
|
/* Configure supported hardware */
|
|
if (config->supported_hw) {
|
|
ret = _opp_set_supported_hw(opp_table, config->supported_hw,
|
|
config->supported_hw_count);
|
|
if (ret)
|
|
goto err;
|
|
|
|
data->flags |= OPP_CONFIG_SUPPORTED_HW;
|
|
}
|
|
|
|
/* Configure supplies */
|
|
if (config->regulator_names) {
|
|
ret = _opp_set_regulators(opp_table, dev,
|
|
config->regulator_names);
|
|
if (ret)
|
|
goto err;
|
|
|
|
data->flags |= OPP_CONFIG_REGULATOR;
|
|
}
|
|
|
|
/* Attach genpds */
|
|
if (config->genpd_names) {
|
|
ret = _opp_attach_genpd(opp_table, dev, config->genpd_names,
|
|
config->virt_devs);
|
|
if (ret)
|
|
goto err;
|
|
|
|
data->flags |= OPP_CONFIG_GENPD;
|
|
}
|
|
|
|
ret = xa_alloc(&opp_configs, &id, data, XA_LIMIT(1, INT_MAX),
|
|
GFP_KERNEL);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return id;
|
|
|
|
err:
|
|
_opp_clear_config(data);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_set_config);
|
|
|
|
/**
|
|
* dev_pm_opp_clear_config() - Releases resources blocked for OPP configuration.
|
|
* @opp_table: OPP table returned from dev_pm_opp_set_config().
|
|
*
|
|
* This allows all device OPP configurations to be cleared at once. This must be
|
|
* called once for each call made to dev_pm_opp_set_config(), in order to free
|
|
* the OPPs properly.
|
|
*
|
|
* Currently the first call itself ends up freeing all the OPP configurations,
|
|
* while the later ones only drop the OPP table reference. This works well for
|
|
* now as we would never want to use an half initialized OPP table and want to
|
|
* remove the configurations together.
|
|
*/
|
|
void dev_pm_opp_clear_config(int token)
|
|
{
|
|
struct opp_config_data *data;
|
|
|
|
/*
|
|
* This lets the callers call this unconditionally and keep their code
|
|
* simple.
|
|
*/
|
|
if (unlikely(token <= 0))
|
|
return;
|
|
|
|
data = xa_erase(&opp_configs, token);
|
|
if (WARN_ON(!data))
|
|
return;
|
|
|
|
_opp_clear_config(data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_clear_config);
|
|
|
|
static void devm_pm_opp_config_release(void *token)
|
|
{
|
|
dev_pm_opp_clear_config((unsigned long)token);
|
|
}
|
|
|
|
/**
|
|
* devm_pm_opp_set_config() - Set OPP configuration for the device.
|
|
* @dev: Device for which configuration is being set.
|
|
* @config: OPP configuration.
|
|
*
|
|
* This allows all device OPP configurations to be performed at once.
|
|
* This is a resource-managed variant of dev_pm_opp_set_config().
|
|
*
|
|
* Return: 0 on success and errorno otherwise.
|
|
*/
|
|
int devm_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
|
|
{
|
|
int token = dev_pm_opp_set_config(dev, config);
|
|
|
|
if (token < 0)
|
|
return token;
|
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_config_release,
|
|
(void *) ((unsigned long) token));
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_opp_set_config);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
if (!assert_single_clk(opp_table)) {
|
|
r = -EINVAL;
|
|
goto put_table;
|
|
}
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
|
|
/* Do we have the frequency? */
|
|
list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
|
|
if (tmp_opp->rates[0] == 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;
|
|
}
|
|
|
|
if (!assert_single_clk(opp_table)) {
|
|
r = -EINVAL;
|
|
goto put_table;
|
|
}
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
|
|
/* Do we have the frequency? */
|
|
list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
|
|
if (tmp_opp->rates[0] == 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 put_table;
|
|
|
|
adjust_unlock:
|
|
mutex_unlock(&opp_table->lock);
|
|
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);
|