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authorViresh Kumar <viresh.kumar@linaro.org>2013-12-03 00:50:46 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-01-06 08:17:25 -0500
commitd3916691c90dfc9f08328d5cef8181e9ea508c55 (patch)
treee32b3422823ef3a64a42c1c72785a169fff20a9c /include/linux/cpufreq.h
parentae6b427132ba39d023e332e7d920e9931ff05313 (diff)
cpufreq: Make sure CPU is running on a freq from freq-table
Sometimes boot loaders set CPU frequency to a value outside of frequency table present with cpufreq core. In such cases CPU might be unstable if it has to run on that frequency for long duration of time and so its better to set it to a frequency which is specified in freq-table. This also makes cpufreq stats inconsistent as cpufreq-stats would fail to register because current frequency of CPU isn't found in freq-table. Because we don't want this change to affect boot process badly, we go for the next freq which is >= policy->cur ('cur' must be set by now, otherwise we will end up setting freq to lowest of the table as 'cur' is initialized to zero). In case current frequency doesn't match any frequency from freq-table, we throw warnings to user, so that user can get this fixed in their bootloaders or freq-tables. Reported-by: Carlos Hernandez <ceh@ti.com> Reported-and-tested-by: Nishanth Menon <nm@ti.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/cpufreq.h')
-rw-r--r--include/linux/cpufreq.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 91b8c84e8cd0..aaf800eb9dd2 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -450,6 +450,8 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
450 unsigned int target_freq, 450 unsigned int target_freq,
451 unsigned int relation, 451 unsigned int relation,
452 unsigned int *index); 452 unsigned int *index);
453int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
454 unsigned int freq);
453 455
454void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy); 456void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy);
455ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); 457ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);