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Subject[PATCH 1/2] cpufreq: Introduce new relation for freq selection
Date
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>
---
drivers/cpufreq/freq_table.c | 12 +++++++++++-
include/linux/cpufreq.h | 1 +
2 files changed, 12 insertions(+), 1 deletion(-)

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 ec4112d..00fad91 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;
--
1.9.3


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