cpufreq: add function to get the hardware max frequency
Add weak function to return the hardware maximum frequency of a CPU,
with the default implementation returning cpuinfo.max_freq, which is
the best information we can generically get from the cpufreq framework.
The default can be overwritten by a strong function in platforms
that want to provide an alternative implementation, with more accurate
information, obtained either from hardware or firmware.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 0fb561d..f724025 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -205,6 +205,7 @@ static inline bool policy_is_shared(struct cpufreq_policy *policy)
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);
@@ -232,6 +233,10 @@ 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