lkml.org 
[lkml]   [2020]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
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
\
 
 \ /
  Last update: 2020-02-11 19:47    [W:0.243 / U:0.808 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site