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>
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@ -117,7 +117,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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.frequency = 0,
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.frequency = 0,
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};
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};
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struct cpufreq_frequency_table *pos;
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struct cpufreq_frequency_table *pos;
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unsigned int freq, i = 0;
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unsigned int freq, diff, i = 0;
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pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
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pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
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target_freq, relation, policy->cpu);
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target_freq, relation, policy->cpu);
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@ -127,6 +127,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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suboptimal.frequency = ~0;
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suboptimal.frequency = ~0;
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break;
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break;
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case CPUFREQ_RELATION_L:
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case CPUFREQ_RELATION_L:
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case CPUFREQ_RELATION_C:
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optimal.frequency = ~0;
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optimal.frequency = ~0;
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break;
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break;
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}
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}
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@ -168,6 +169,15 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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}
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}
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}
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}
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break;
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break;
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case CPUFREQ_RELATION_C:
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diff = abs(freq - target_freq);
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if (diff < optimal.frequency ||
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(diff == optimal.frequency &&
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freq > table[optimal.driver_data].frequency)) {
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optimal.frequency = diff;
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optimal.driver_data = i;
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}
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break;
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}
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}
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}
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}
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if (optimal.driver_data > i) {
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if (optimal.driver_data > i) {
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@ -176,6 +176,7 @@ static inline void disable_cpufreq(void) { }
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#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
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#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
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#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
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#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
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#define CPUFREQ_RELATION_C 2 /* closest frequency to target */
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struct freq_attr {
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struct freq_attr {
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struct attribute attr;
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struct attribute attr;
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