diff options
| author | Stratos Karafotis <stratosk@semaphore.gr> | 2014-06-30 19:59:33 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-07-21 13:43:19 +0200 |
| commit | 5b0c0b16d48d20e26859907df4dd449e3b3c7f4c (patch) | |
| tree | 39a03f932232701615350efba56302928362f634 | |
| parent | 22d0628a226c9864fabd621ef2bf64c841219b46 (diff) | |
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.c | 12 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 1 |
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c index 1632981c4b25..df14766a8e06 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 8f8ae95c6e27..7d1955afa62c 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; |