forked from Minki/linux
283d55e68d
When two or more devices are sharing their clock and voltage rails, they share the same OPP table. But there are some corner cases where the OPP core incorrectly creates separate OPP tables for them. For example, CPU 0 and 1 share clock/voltage rails. The platform specific code calls dev_pm_opp_set_regulators() for CPU0 and the OPP core creates an OPP table for it (the individual OPPs aren't initialized as of now). The same is repeated for CPU1 then. Because _opp_get_opp_table() doesn't compare DT node pointers currently, it fails to find the link between CPU0 and CPU1 and so creates a new OPP table. Fix this by calling _managed_opp() from _opp_get_opp_table(). _managed_opp() gain an additional argument (index) to get the right node pointer. This resulted in simplifying code in _of_add_opp_table_v2() as well. Tested-by: Niklas Cassel <niklas.cassel@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
236 lines
7.6 KiB
C
236 lines
7.6 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __DRIVER_OPP_H__
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#define __DRIVER_OPP_H__
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/limits.h>
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#include <linux/pm_opp.h>
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#include <linux/notifier.h>
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struct clk;
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struct regulator;
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/* Lock to allow exclusive modification to the device and opp lists */
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extern struct mutex opp_table_lock;
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extern struct list_head opp_tables;
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/*
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* Internal data structure organization with the OPP layer library is as
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* follows:
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* opp_tables (root)
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* |- device 1 (represents voltage domain 1)
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* | |- opp 1 (availability, freq, voltage)
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* | |- opp 2 ..
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* ... ...
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* | `- opp n ..
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* |- device 2 (represents the next voltage domain)
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* ...
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* `- device m (represents mth voltage domain)
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* device 1, 2.. are represented by opp_table structure while each opp
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* is represented by the opp structure.
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*/
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/**
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* struct dev_pm_opp - Generic OPP description structure
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* @node: opp table node. The nodes are maintained throughout the lifetime
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* of boot. It is expected only an optimal set of OPPs are
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* added to the library by the SoC framework.
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* IMPORTANT: the opp nodes should be maintained in increasing
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* order.
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* @kref: for reference count of the OPP.
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* @available: true/false - marks if this OPP as available or not
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* @dynamic: not-created from static DT entries.
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* @turbo: true if turbo (boost) OPP
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* @suspend: true if suspend OPP
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* @pstate: Device's power domain's performance state.
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* @rate: Frequency in hertz
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* @supplies: Power supplies voltage/current values
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* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
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* frequency from any other OPP's frequency.
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* @opp_table: points back to the opp_table struct this opp belongs to
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* @np: OPP's device node.
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* @dentry: debugfs dentry pointer (per opp)
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*
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* This structure stores the OPP information for a given device.
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*/
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struct dev_pm_opp {
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struct list_head node;
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struct kref kref;
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bool available;
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bool dynamic;
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bool turbo;
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bool suspend;
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unsigned int pstate;
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unsigned long rate;
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struct dev_pm_opp_supply *supplies;
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unsigned long clock_latency_ns;
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struct opp_table *opp_table;
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struct device_node *np;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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#endif
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};
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/**
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* struct opp_device - devices managed by 'struct opp_table'
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* @node: list node
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* @dev: device to which the struct object belongs
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* @dentry: debugfs dentry pointer (per device)
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*
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* This is an internal data structure maintaining the devices that are managed
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* by 'struct opp_table'.
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*/
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struct opp_device {
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struct list_head node;
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const struct device *dev;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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#endif
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};
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enum opp_table_access {
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OPP_TABLE_ACCESS_UNKNOWN = 0,
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OPP_TABLE_ACCESS_EXCLUSIVE = 1,
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OPP_TABLE_ACCESS_SHARED = 2,
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};
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/**
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* struct opp_table - Device opp structure
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* @node: table node - contains the devices with OPPs that
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* have been registered. Nodes once added are not modified in this
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* table.
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* @head: notifier head to notify the OPP availability changes.
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* @dev_list: list of devices that share these OPPs
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* @opp_list: table of opps
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* @kref: for reference count of the table.
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* @list_kref: for reference count of the OPP list.
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* @lock: mutex protecting the opp_list and dev_list.
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* @np: struct device_node pointer for opp's DT node.
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* @clock_latency_ns_max: Max clock latency in nanoseconds.
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* @parsed_static_opps: True if OPPs are initialized from DT.
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* @shared_opp: OPP is shared between multiple devices.
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* @suspend_opp: Pointer to OPP to be used during device suspend.
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* @supported_hw: Array of version number to support.
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* @supported_hw_count: Number of elements in supported_hw array.
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* @prop_name: A name to postfix to many DT properties, while parsing them.
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* @clk: Device's clock handle
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* @regulators: Supply regulators
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* @regulator_count: Number of power supply regulators
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* @genpd_performance_state: Device's power domain support performance state.
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* @set_opp: Platform specific set_opp callback
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* @set_opp_data: Data to be passed to set_opp callback
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* @dentry: debugfs dentry pointer of the real device directory (not links).
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* @dentry_name: Name of the real dentry.
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*
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* @voltage_tolerance_v1: In percentage, for v1 bindings only.
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*
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* This is an internal data structure maintaining the link to opps attached to
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* a device. This structure is not meant to be shared to users as it is
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* meant for book keeping and private to OPP library.
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*/
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struct opp_table {
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struct list_head node;
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struct blocking_notifier_head head;
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struct list_head dev_list;
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struct list_head opp_list;
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struct kref kref;
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struct kref list_kref;
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struct mutex lock;
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struct device_node *np;
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unsigned long clock_latency_ns_max;
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/* For backward compatibility with v1 bindings */
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unsigned int voltage_tolerance_v1;
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bool parsed_static_opps;
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enum opp_table_access shared_opp;
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struct dev_pm_opp *suspend_opp;
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unsigned int *supported_hw;
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unsigned int supported_hw_count;
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const char *prop_name;
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struct clk *clk;
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struct regulator **regulators;
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unsigned int regulator_count;
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bool genpd_performance_state;
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int (*set_opp)(struct dev_pm_set_opp_data *data);
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struct dev_pm_set_opp_data *set_opp_data;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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char dentry_name[NAME_MAX];
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#endif
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};
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/* Routines internal to opp core */
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void dev_pm_opp_get(struct dev_pm_opp *opp);
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void _opp_remove_all_static(struct opp_table *opp_table);
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void _get_opp_table_kref(struct opp_table *opp_table);
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int _get_opp_count(struct opp_table *opp_table);
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struct opp_table *_find_opp_table(struct device *dev);
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struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
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void _dev_pm_opp_find_and_remove_table(struct device *dev);
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struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
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void _opp_free(struct dev_pm_opp *opp);
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int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available);
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int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
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void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
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struct opp_table *_add_opp_table(struct device *dev);
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void _put_opp_list_kref(struct opp_table *opp_table);
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#ifdef CONFIG_OF
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void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
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struct opp_table *_managed_opp(struct device *dev, int index);
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#else
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static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
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static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
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#endif
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#ifdef CONFIG_DEBUG_FS
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void opp_debug_remove_one(struct dev_pm_opp *opp);
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int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
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int opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
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void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
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#else
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static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
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static inline int opp_debug_create_one(struct dev_pm_opp *opp,
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struct opp_table *opp_table)
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{ return 0; }
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static inline int opp_debug_register(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{ return 0; }
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static inline void opp_debug_unregister(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{ }
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#endif /* DEBUG_FS */
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#endif /* __DRIVER_OPP_H__ */
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