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authorStratos Karafotis <stratosk@semaphore.gr>2014-06-30 19:59:33 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-07-21 13:43:19 +0200
commit5b0c0b16d48d20e26859907df4dd449e3b3c7f4c (patch)
tree39a03f932232701615350efba56302928362f634
parent22d0628a226c9864fabd621ef2bf64c841219b46 (diff)
downloadop-kernel-dev-5b0c0b16d48d20e26859907df4dd449e3b3c7f4c.zip
op-kernel-dev-5b0c0b16d48d20e26859907df4dd449e3b3c7f4c.tar.gz
cpufreq: Introduce new relation for freq selection
Introduce CPUFREQ_RELATION_C for frequency selection. It selects the frequency with the minimum euclidean distance to target. In case of equal distance between 2 frequencies, it will select the greater frequency. Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/cpufreq/freq_table.c12
-rw-r--r--include/linux/cpufreq.h1
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
index 1632981..df14766 100644
--- a/drivers/cpufreq/freq_table.c
+++ b/drivers/cpufreq/freq_table.c
@@ -117,7 +117,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
.frequency = 0,
};
struct cpufreq_frequency_table *pos;
- unsigned int freq, i = 0;
+ unsigned int freq, diff, i = 0;
pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
target_freq, relation, policy->cpu);
@@ -127,6 +127,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
suboptimal.frequency = ~0;
break;
case CPUFREQ_RELATION_L:
+ case CPUFREQ_RELATION_C:
optimal.frequency = ~0;
break;
}
@@ -168,6 +169,15 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
}
}
break;
+ case CPUFREQ_RELATION_C:
+ diff = abs(freq - target_freq);
+ if (diff < optimal.frequency ||
+ (diff == optimal.frequency &&
+ freq > table[optimal.driver_data].frequency)) {
+ optimal.frequency = diff;
+ optimal.driver_data = i;
+ }
+ break;
}
}
if (optimal.driver_data > i) {
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 8f8ae95..7d1955a 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -176,6 +176,7 @@ static inline void disable_cpufreq(void) { }
#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
+#define CPUFREQ_RELATION_C 2 /* closest frequency to target */
struct freq_attr {
struct attribute attr;
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