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Merge branch 'pm-cpufreq'
* pm-cpufreq: (28 commits) cpufreq: handle calls to ->target_index() in separate routine cpufreq: s5pv210: drop check for CONFIG_PM_VERBOSE cpufreq: intel_pstate: Remove unused member name of cpudata cpufreq: Break out early when frequency equals target_freq cpufreq: Tegra: drop wrapper around tegra_update_cpu_speed() cpufreq: imx6q: Remove unused include cpufreq: imx6q: Drop devm_clk/regulator_get usage cpufreq: powernow-k8: Suppress checkpatch warnings cpufreq: powernv: make local function static cpufreq: Enable big.LITTLE cpufreq driver on arm64 cpufreq: nforce2: remove DEFINE_PCI_DEVICE_TABLE macro intel_pstate: Add CPU IDs for Broadwell processors cpufreq: Fix build error on some platforms that use cpufreq_for_each_* PM / OPP: Move cpufreq specific OPP functions out of generic OPP library PM / OPP: Remove cpufreq wrapper dependency on internal data organization cpufreq: Catch double invocations of cpufreq_freq_transition_begin/end intel_pstate: Remove sample parameter in intel_pstate_calc_busy cpufreq: Kconfig: Fix spelling errors cpufreq: Make [email protected] official mailing list cpufreq: exynos: Use dev_err/info function instead of pr_err/info ...
This commit is contained in:
Rafael J. Wysocki
commit
057beb1de5
46 changed files with 576 additions and 556 deletions
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@ -128,7 +128,7 @@ Description: Discover cpuidle policy and mechanism
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What: /sys/devices/system/cpu/cpu#/cpufreq/*
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Date: pre-git history
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Contact: cpufreq@vger.kernel.org
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Contact: linux-pm@vger.kernel.org
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Description: Discover and change clock speed of CPUs
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Clock scaling allows you to change the clock speed of the
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@ -146,7 +146,7 @@ Description: Discover and change clock speed of CPUs
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What: /sys/devices/system/cpu/cpu#/cpufreq/freqdomain_cpus
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Date: June 2013
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Contact: cpufreq@vger.kernel.org
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Contact: linux-pm@vger.kernel.org
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Description: Discover CPUs in the same CPU frequency coordination domain
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freqdomain_cpus is the list of CPUs (online+offline) that share
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@ -20,6 +20,7 @@ Contents:
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---------
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1. CPUFreq core and interfaces
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2. CPUFreq notifiers
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3. CPUFreq Table Generation with Operating Performance Point (OPP)
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1. General Information
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=======================
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@ -92,3 +93,31 @@ values:
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cpu - number of the affected CPU
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old - old frequency
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new - new frequency
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3. CPUFreq Table Generation with Operating Performance Point (OPP)
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==================================================================
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For details about OPP, see Documentation/power/opp.txt
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dev_pm_opp_init_cpufreq_table - cpufreq framework typically is initialized with
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cpufreq_frequency_table_cpuinfo which is provided with the list of
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frequencies that are available for operation. This function provides
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a ready to use conversion routine to translate the OPP layer's internal
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information about the available frequencies into a format readily
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providable to cpufreq.
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WARNING: Do not use this function in interrupt context.
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Example:
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soc_pm_init()
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{
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/* Do things */
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r = dev_pm_opp_init_cpufreq_table(dev, &freq_table);
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if (!r)
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cpufreq_frequency_table_cpuinfo(policy, freq_table);
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/* Do other things */
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}
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NOTE: This function is available only if CONFIG_CPU_FREQ is enabled in
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addition to CONFIG_PM_OPP.
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dev_pm_opp_free_cpufreq_table - Free up the table allocated by dev_pm_opp_init_cpufreq_table
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@ -228,3 +228,22 @@ is the corresponding frequency table helper for the ->target
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stage. Just pass the values to this function, and the unsigned int
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index returns the number of the frequency table entry which contains
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the frequency the CPU shall be set to.
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The following macros can be used as iterators over cpufreq_frequency_table:
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cpufreq_for_each_entry(pos, table) - iterates over all entries of frequency
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table.
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cpufreq-for_each_valid_entry(pos, table) - iterates over all entries,
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excluding CPUFREQ_ENTRY_INVALID frequencies.
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Use arguments "pos" - a cpufreq_frequency_table * as a loop cursor and
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"table" - the cpufreq_frequency_table * you want to iterate over.
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For example:
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struct cpufreq_frequency_table *pos, *driver_freq_table;
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cpufreq_for_each_entry(pos, driver_freq_table) {
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/* Do something with pos */
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pos->frequency = ...
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}
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@ -35,8 +35,8 @@ Mailing List
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------------
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There is a CPU frequency changing CVS commit and general list where
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you can report bugs, problems or submit patches. To post a message,
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send an email to cpufreq@vger.kernel.org, to subscribe go to
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http://vger.kernel.org/vger-lists.html#cpufreq and follow the
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send an email to linux-pm@vger.kernel.org, to subscribe go to
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http://vger.kernel.org/vger-lists.html#linux-pm and follow the
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instructions there.
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Links
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@ -10,8 +10,7 @@ Contents
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3. OPP Search Functions
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4. OPP Availability Control Functions
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5. OPP Data Retrieval Functions
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6. Cpufreq Table Generation
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7. Data Structures
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6. Data Structures
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1. Introduction
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===============
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@ -72,7 +71,6 @@ operations until that OPP could be re-enabled if possible.
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OPP library facilitates this concept in it's implementation. The following
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operational functions operate only on available opps:
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opp_find_freq_{ceil, floor}, dev_pm_opp_get_voltage, dev_pm_opp_get_freq, dev_pm_opp_get_opp_count
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and dev_pm_opp_init_cpufreq_table
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dev_pm_opp_find_freq_exact is meant to be used to find the opp pointer which can then
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be used for dev_pm_opp_enable/disable functions to make an opp available as required.
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@ -96,10 +94,9 @@ using RCU read locks. The opp_find_freq_{exact,ceil,floor},
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opp_get_{voltage, freq, opp_count} fall into this category.
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opp_{add,enable,disable} are updaters which use mutex and implement it's own
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RCU locking mechanisms. dev_pm_opp_init_cpufreq_table acts as an updater and uses
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mutex to implment RCU updater strategy. These functions should *NOT* be called
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under RCU locks and other contexts that prevent blocking functions in RCU or
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mutex operations from working.
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RCU locking mechanisms. These functions should *NOT* be called under RCU locks
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and other contexts that prevent blocking functions in RCU or mutex operations
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from working.
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2. Initial OPP List Registration
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================================
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@ -311,34 +308,7 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device
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/* Do other things */
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}
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6. Cpufreq Table Generation
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===========================
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dev_pm_opp_init_cpufreq_table - cpufreq framework typically is initialized with
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cpufreq_frequency_table_cpuinfo which is provided with the list of
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frequencies that are available for operation. This function provides
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a ready to use conversion routine to translate the OPP layer's internal
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information about the available frequencies into a format readily
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providable to cpufreq.
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WARNING: Do not use this function in interrupt context.
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Example:
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soc_pm_init()
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{
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/* Do things */
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r = dev_pm_opp_init_cpufreq_table(dev, &freq_table);
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if (!r)
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cpufreq_frequency_table_cpuinfo(policy, freq_table);
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/* Do other things */
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}
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NOTE: This function is available only if CONFIG_CPU_FREQ is enabled in
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addition to CONFIG_PM as power management feature is required to
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dynamically scale voltage and frequency in a system.
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dev_pm_opp_free_cpufreq_table - Free up the table allocated by dev_pm_opp_init_cpufreq_table
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7. Data Structures
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6. Data Structures
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==================
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Typically an SoC contains multiple voltage domains which are variable. Each
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domain is represented by a device pointer. The relationship to OPP can be
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