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    Subject[PATCH v3 5/7] cpufreq: add function to get the hardware max frequency
    Date
    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 <ionela.voinescu@arm.com>
    Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
    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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