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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-10-03 20:29:07 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-10-16 00:50:33 +0200 |
| commit | 70e9e778337973d5bf57004092b360bd3f3c412f (patch) | |
| tree | 8c8f19f60b723421764caee1926f15db36bdb35b | |
| parent | 9909aa1e3b69eb05201bdbd2b9bde00c50c1723a (diff) | |
| download | linux-stable-70e9e778337973d5bf57004092b360bd3f3c412f.tar.gz linux-stable-70e9e778337973d5bf57004092b360bd3f3c412f.tar.bz2 linux-stable-70e9e778337973d5bf57004092b360bd3f3c412f.zip | |
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: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 31 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 3 |
3 files changed, 35 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index 534fcb825153..2d06754f4a04 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -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 diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index f033adf06eaf..985f325adc4f 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -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; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 36ccd0bf1304..0aba2a6cadaf 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -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); |