Lines Matching +full:current +full:- +full:boost +full:- +full:limit
1 .. SPDX-License-Identifier: GPL-2.0
10 - Dominik Brodowski <linux@brodo.de>
11 - Rafael J. Wysocki <rafael.j.wysocki@intel.com>
12 - Viresh Kumar <viresh.kumar@linaro.org>
18 1.2 Per-CPU Initialization
31 So, you just got a brand-new CPU / chipset with datasheets and want to
37 ------------------
46 .name - The name of this driver.
48 .init - A pointer to the per-policy initialization function.
50 .verify - A pointer to a "verification" function.
52 .setpolicy _or_ .fast_switch _or_ .target _or_ .target_index - See
57 .flags - Hints for the cpufreq core.
59 .driver_data - cpufreq driver specific data.
61 .get_intermediate and target_intermediate - Used to switch to stable
64 .get - Returns current frequency of the CPU.
66 .bios_limit - Returns HW/BIOS max frequency limitations for the CPU.
68 .exit - A pointer to a per-policy cleanup function called during
71 .suspend - A pointer to a per-policy suspend function which is called
75 .resume - A pointer to a per-policy resume function which is called
78 .ready - A pointer to a per-policy ready function which is called after
81 .attr - A pointer to a NULL-terminated list of "struct freq_attr" which
84 .boost_enabled - If set, boost frequencies are enabled.
86 .set_boost - A pointer to a per-policy function to enable/disable boost
90 1.2 Per-CPU Initialization
91 --------------------------
94 cpufreq driver registers itself, the per-policy initialization function
104 +-----------------------------------+--------------------------------------+
105 |policy->cpuinfo.min_freq _and_ | |
106 |policy->cpuinfo.max_freq | the minimum and maximum frequency |
109 +-----------------------------------+--------------------------------------+
110 |policy->cpuinfo.transition_latency | the time it takes on this CPU to |
114 +-----------------------------------+--------------------------------------+
115 |policy->cur | The current operating frequency of |
117 +-----------------------------------+--------------------------------------+
118 |policy->min, | |
119 |policy->max, | |
120 |policy->policy and, if necessary, | |
121 |policy->governor | must contain the "default policy" for|
127 +-----------------------------------+--------------------------------------+
128 |policy->cpus | Update this with the masks of the |
132 +-----------------------------------+--------------------------------------+
134 For setting some of these values (cpuinfo.min[max]_freq, policy->min[max]), the
140 ----------
150 range) is within policy->min and policy->max. If necessary, increase
151 policy->max first, and only if this is no solution, decrease policy->min.
155 -------------------------------------------------------
159 these, you use the ->target(), ->target_index() or ->fast_switch()
163 limits on their own. These shall use the ->setpolicy() callback.
167 ------------------------
175 It should always restore to earlier frequency (i.e. policy->restore_freq) in
179 ----------
186 - keep close to "target_freq"
187 - policy->min <= new_freq <= policy->max (THIS MUST BE VALID!!!)
188 - if relation==CPUFREQ_REL_L, try to select a new_freq higher than or equal
190 - if relation==CPUFREQ_REL_H, try to select a new_freq lower than or equal
193 Here again the frequency table helper might assist you - see section 2
197 ----------------
209 -------------
212 argument. You need to set the lower limit of the in-processor or
213 in-chipset dynamic frequency switching to policy->min, the upper limit
214 to policy->max, and -if supported- select a performance-oriented
215 setting when policy->policy is CPUFREQ_POLICY_PERFORMANCE, and a
216 powersaving-oriented setting when CPUFREQ_POLICY_POWERSAVE. Also check
220 --------------------------------------------
232 directly call ->target_index().
234 NOTE: ->target_index() should restore to policy->restore_freq in case of
254 valid pointer in its policy->freq_table field.
257 frequency is within policy->min and policy->max, and all other criteria
258 are met. This is helpful for the ->verify call.
261 helper for the ->target stage. Just pass the values to this function,
267 cpufreq_for_each_entry(pos, table) - iterates over all entries of frequency
270 cpufreq_for_each_valid_entry(pos, table) - iterates over all entries,
272 Use arguments "pos" - a ``cpufreq_frequency_table *`` as a loop cursor and
273 "table" - the ``cpufreq_frequency_table *`` you want to iterate over.
281 pos->frequency = ...