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Commit d9d13ae1 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

qcom-cpufreq: Cache the resolved frequency index 



This driver implements resolved_freq and target methods.
Since target method does not know the resolved frequency
index, the frequency table look up is needed again. We
can optimize this by caching the resolved frequency
index in the resolved_freq method.

Change-Id: Ib303ef57c51ce50de52b759728bc8c162a90dc29
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent 59386c83

drivers/cpufreq/qcom-cpufreq.c

+17 −2
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ struct cpufreq_suspend_t { 
};



static DEFINE_PER_CPU(struct cpufreq_suspend_t, suspend_data);

static DEFINE_PER_CPU(int, cached_resolve_idx);

static DEFINE_PER_CPU(unsigned int, cached_resolve_freq);



static int set_cpu_freq(struct cpufreq_policy *policy, unsigned int new_freq,

			unsigned int index)
@@ -74,6 +76,7 @@ static int msm_cpufreq_target(struct cpufreq_policy *policy, 
	int ret = 0;

	int index;

	struct cpufreq_frequency_table *table;

	int first_cpu = cpumask_first(policy->related_cpus);



	mutex_lock(&per_cpu(suspend_data, policy->cpu).suspend_mutex);
@@ -94,7 +97,11 @@ static int msm_cpufreq_target(struct cpufreq_policy *policy, 
		ret = -ENODEV;

		goto done;

	}

	index = cpufreq_frequency_table_target(policy, target_freq, relation);

	if (per_cpu(cached_resolve_freq, first_cpu) == target_freq)

		index = per_cpu(cached_resolve_idx, first_cpu);

	else

		index = cpufreq_frequency_table_target(policy, target_freq,

						       relation);



	pr_debug("CPU[%d] target %d relation %d (%d-%d) selected %d\n",

		policy->cpu, target_freq, relation,
@@ -111,10 +118,17 @@ static unsigned int msm_cpufreq_resolve_freq(struct cpufreq_policy *policy, 
					     unsigned int target_freq)

{

	int index;

	int first_cpu = cpumask_first(policy->related_cpus);

	unsigned int freq;



	index = cpufreq_frequency_table_target(policy, target_freq,

					       CPUFREQ_RELATION_L);

	return policy->freq_table[index].frequency;

	freq = policy->freq_table[index].frequency;



	per_cpu(cached_resolve_idx, first_cpu) = index;

	per_cpu(cached_resolve_freq, first_cpu) = freq;



	return freq;

}



static int msm_cpufreq_verify(struct cpufreq_policy *policy)
@@ -473,6 +487,7 @@ static int __init msm_cpufreq_register(void) 
	for_each_possible_cpu(cpu) {

		mutex_init(&(per_cpu(suspend_data, cpu).suspend_mutex));

		per_cpu(suspend_data, cpu).device_suspended = 0;

		per_cpu(cached_resolve_freq, cpu) = UINT_MAX;

	}



	rc = platform_driver_register(&msm_cpufreq_plat_driver);