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Commit 70e9e778 authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
Browse files

cpufreq: create cpufreq_generic_init() routine 



Many CPUFreq drivers for SMP system (where all cores share same clock lines), do
similar stuff in their ->init() part.

This patch creates a generic routine in cpufreq core which can be used by these
so that we can remove some redundant code.

Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 9909aa1e

drivers/cpufreq/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ menu "CPU Frequency scaling" 


config CPU_FREQ

	bool "CPU Frequency scaling"

	select CPU_FREQ_TABLE

	help

	  CPU Frequency scaling allows you to change the clock speed of 

	  CPUs on the fly. This is a nice method to save power, because

drivers/cpufreq/cpufreq.c

+31 −0
Original line number Diff line number Diff line
@@ -181,6 +181,37 @@ u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) 
}

EXPORT_SYMBOL_GPL(get_cpu_idle_time);



/*

 * This is a generic cpufreq init() routine which can be used by cpufreq

 * drivers of SMP systems. It will do following:

 * - validate & show freq table passed

 * - set policies transition latency

 * - policy->cpus with all possible CPUs

 */

int cpufreq_generic_init(struct cpufreq_policy *policy,

		struct cpufreq_frequency_table *table,

		unsigned int transition_latency)

{

	int ret;



	ret = cpufreq_table_validate_and_show(policy, table);

	if (ret) {

		pr_err("%s: invalid frequency table: %d\n", __func__, ret);

		return ret;

	}



	policy->cpuinfo.transition_latency = transition_latency;



	/*

	 * The driver only supports the SMP configuartion where all processors

	 * share the clock and voltage and clock.

	 */

	cpumask_setall(policy->cpus);



	return 0;

}

EXPORT_SYMBOL_GPL(cpufreq_generic_init);



struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)

{

	struct cpufreq_policy *policy = NULL;

include/linux/cpufreq.h

+3 −0
Original line number Diff line number Diff line
@@ -424,6 +424,9 @@ void cpufreq_frequency_table_put_attr(unsigned int cpu); 
int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,

				      struct cpufreq_frequency_table *table);



int cpufreq_generic_init(struct cpufreq_policy *policy,

		struct cpufreq_frequency_table *table,

		unsigned int transition_latency);

static inline int cpufreq_generic_exit(struct cpufreq_policy *policy)

{

	cpufreq_frequency_table_put_attr(policy->cpu);