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cpufreq: Introduce new relation for freq selection

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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>
This commit is contained in:
Stratos Karafotis 2014-06-30 19:59:33 +03:00 • committed by Rafael J. Wysocki
commit 5b0c0b16d4
2 changed files with 12 additions and 1 deletions
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12
drivers/cpufreq/freq_table.c
View file

@ -117,7 +117,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
.frequency = 0, .frequency = 0,
}; };
struct cpufreq_frequency_table *pos; 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", pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
target_freq, relation, policy->cpu); target_freq, relation, policy->cpu);
@ -127,6 +127,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
suboptimal.frequency = ~0; suboptimal.frequency = ~0;
break; break;
case CPUFREQ_RELATION_L: case CPUFREQ_RELATION_L:
case CPUFREQ_RELATION_C:
optimal.frequency = ~0; optimal.frequency = ~0;
break; break;
} }
@ -168,6 +169,15 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
} }
} }
break; 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) { if (optimal.driver_data > i) {

1
include/linux/cpufreq.h
View file

@ -176,6 +176,7 @@ static inline void disable_cpufreq(void) { }
#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ #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_H 1 /* highest frequency below or at target */
#define CPUFREQ_RELATION_C 2 /* closest frequency to target */
struct freq_attr { struct freq_attr {
struct attribute attr; struct attribute attr;