[PATCH v3 5/7] cpufreq: add function to get the hardware max frequency
From: Ionela Voinescu <hidden>
Date: 2020-02-11 18:46:39
Also in:
linux-doc, linux-pm, lkml
Subsystem:
cpu frequency scaling framework, the rest · Maintainers:
"Rafael J. Wysocki", Viresh Kumar, Linus Torvalds
Add weak function to return the hardware maximum frequency of a CPU, with the default implementation returning cpuinfo.max_freq. The default can be overwritten by a strong function in platforms that want to provide an alternative implementation. Signed-off-by: Ionela Voinescu <redacted> Cc: Rafael J. Wysocki <redacted> Cc: Viresh Kumar <viresh.kumar@linaro.org> --- drivers/cpufreq/cpufreq.c | 20 ++++++++++++++++++++ include/linux/cpufreq.h | 5 +++++ 2 files changed, 25 insertions(+)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 77114a3897fb..d2ff3018861d 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c@@ -1733,6 +1733,26 @@ unsigned int cpufreq_quick_get_max(unsigned int cpu) } EXPORT_SYMBOL(cpufreq_quick_get_max); +/** + * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU + * @cpu: CPU number + * + * The default return value is the max_freq field of cpuinfo. + */ +__weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu) +{ + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); + unsigned int ret_freq = 0; + + if (policy) { + ret_freq = policy->cpuinfo.max_freq; + cpufreq_cpu_put(policy); + } + + return ret_freq; +} +EXPORT_SYMBOL(cpufreq_get_hw_max_freq); + static unsigned int __cpufreq_get(struct cpufreq_policy *policy) { if (unlikely(policy_is_inactive(policy)))
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 31b1b0e03df8..b4423ff619f4 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h@@ -194,6 +194,7 @@ extern struct kobject *cpufreq_global_kobject; unsigned int cpufreq_get(unsigned int cpu); unsigned int cpufreq_quick_get(unsigned int cpu); unsigned int cpufreq_quick_get_max(unsigned int cpu); +unsigned int cpufreq_get_hw_max_freq(unsigned int cpu); void disable_cpufreq(void); u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
@@ -223,6 +224,10 @@ static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) { return 0; } +static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu) +{ + return 0; +} static inline void disable_cpufreq(void) { } #endif
--
2.17.1
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