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Commit 5b0c0b16 authored by Stratos Karafotis's avatar Stratos Karafotis Committed by Rafael J. Wysocki
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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: default avatarStratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 22d0628a

drivers/cpufreq/freq_table.c

+11 −1
Original line number Diff line number Diff line
@@ -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) {

include/linux/cpufreq.h

+1 −0
Original line number Diff line number Diff line
@@ -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;