cpufreq: exynos: Split exynos_target function into two functions

Split exynos_target function into exynos_target & exynos_cpufreq_scale.
The exynos_cpufreq_scale changes the voltage & frequency.
Signed-off-by: NJonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

drivers/cpufreq/exynos-cpufreq.c

@@ -42,54 +42,55 @@ static unsigned int exynos_getspeed(unsigned int cpu)
 	return clk_get_rate(exynos_info->cpu_clk) / 1000;
 }
 
-static int exynos_target(struct cpufreq_policy *policy,
-			  unsigned int target_freq,
-			  unsigned int relation)
+static int exynos_cpufreq_get_index(unsigned int freq)
+{
+	struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
+	int index;
+
+	for (index = 0;
+		freq_table[index].frequency != CPUFREQ_TABLE_END; index++)
+		if (freq_table[index].frequency == freq)
+			break;
+
+	if (freq_table[index].frequency == CPUFREQ_TABLE_END)
+		return -EINVAL;
+
+	return index;
+}
+
+static int exynos_cpufreq_scale(unsigned int target_freq)
 {
-	unsigned int index, old_index;
-	unsigned int arm_volt, safe_arm_volt = 0;
-	int ret = 0;
 	struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
 	unsigned int *volt_table = exynos_info->volt_table;
+	struct cpufreq_policy *policy = cpufreq_cpu_get(0);
+	unsigned int arm_volt, safe_arm_volt = 0;
 	unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz;
-
-	mutex_lock(&cpufreq_lock);
+	unsigned int index, old_index;
+	int ret = 0;
 
 	freqs.old = policy->cur;
+	freqs.cpu = policy->cpu;
 
-	if (frequency_locked && target_freq != locking_frequency) {
-		ret = -EAGAIN;
+	if (target_freq == freqs.old)
 		goto out;
-	}
 
 	/*
 	 * The policy max have been changed so that we cannot get proper
 	 * old_index with cpufreq_frequency_table_target(). Thus, ignore
 	 * policy and get the index from the raw freqeuncy table.
 	 */
-	for (old_index = 0;
-		freq_table[old_index].frequency != CPUFREQ_TABLE_END;
-		old_index++)
-		if (freq_table[old_index].frequency == freqs.old)
-			break;
-
-	if (freq_table[old_index].frequency == CPUFREQ_TABLE_END) {
-		ret = -EINVAL;
+	old_index = exynos_cpufreq_get_index(freqs.old);
+	if (old_index < 0) {
+		ret = old_index;
 		goto out;
 	}
 
-	if (cpufreq_frequency_table_target(policy, freq_table,
-					   target_freq, relation, &index)) {
-		ret = -EINVAL;
+	index = exynos_cpufreq_get_index(target_freq);
+	if (index < 0) {
+		ret = index;
 		goto out;
 	}
 
-	freqs.new = freq_table[index].frequency;
-	freqs.cpu = policy->cpu;
-
-	if (freqs.new == freqs.old)
-		goto out;
-
 	/*
 	 * ARM clock source will be changed APLL to MPLL temporary
 	 * To support this level, need to control regulator for
@@ -109,13 +110,23 @@ static int exynos_target(struct cpufreq_policy *policy,
 	/* When the new frequency is higher than current frequency */
 	if ((freqs.new > freqs.old) && !safe_arm_volt) {
 		/* Firstly, voltage up to increase frequency */
-		regulator_set_voltage(arm_regulator, arm_volt,
-				arm_volt);
+		ret = regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
+		if (ret) {
+			pr_err("%s: failed to set cpu voltage to %d\n",
+				__func__, arm_volt);
+			goto out;
+		}
 	}
 
-	if (safe_arm_volt)
-		regulator_set_voltage(arm_regulator, safe_arm_volt,
+	if (safe_arm_volt) {
+		ret = regulator_set_voltage(arm_regulator, safe_arm_volt,
 				      safe_arm_volt);
+		if (ret) {
+			pr_err("%s: failed to set cpu voltage to %d\n",
+				__func__, safe_arm_volt);
+			goto out;
+		}
+	}
 
 	exynos_info->set_freq(old_index, index);
 
@@ -128,8 +139,43 @@ static int exynos_target(struct cpufreq_policy *policy,
 		/* down the voltage after frequency change */
 		regulator_set_voltage(arm_regulator, arm_volt,
 				arm_volt);
+		if (ret) {
+			pr_err("%s: failed to set cpu voltage to %d\n",
+				__func__, arm_volt);
+			goto out;
+		}
+	}
+
+out:
+
+	cpufreq_cpu_put(policy);
+
+	return ret;
+}
+
+static int exynos_target(struct cpufreq_policy *policy,
+			  unsigned int target_freq,
+			  unsigned int relation)
+{
+	struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
+	unsigned int index;
+	int ret;
+
+	mutex_lock(&cpufreq_lock);
+
+	if (frequency_locked)
+		goto out;
+
+	if (cpufreq_frequency_table_target(policy, freq_table,
+					   target_freq, relation, &index)) {
+		ret = -EINVAL;
+		goto out;
 	}
 
+	freqs.new = freq_table[index].frequency;
+
+	ret = exynos_cpufreq_scale(freqs.new);
+
 out:
 	mutex_unlock(&cpufreq_lock);
 
@@ -166,51 +212,26 @@ static int exynos_cpufreq_resume(struct cpufreq_policy *policy)
 static int exynos_cpufreq_pm_notifier(struct notifier_block *notifier,
 				       unsigned long pm_event, void *v)
 {
-	struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
-	static unsigned int saved_frequency;
-	unsigned int temp;
+	int ret;
 
-	mutex_lock(&cpufreq_lock);
 	switch (pm_event) {
 	case PM_SUSPEND_PREPARE:
-		if (frequency_locked)
-			goto out;
-
+		mutex_lock(&cpufreq_lock);
 		frequency_locked = true;
+		mutex_unlock(&cpufreq_lock);
 
-		if (locking_frequency) {
-			saved_frequency = exynos_getspeed(0);
+		ret = exynos_cpufreq_scale(locking_frequency);
+		if (ret < 0)
+			return NOTIFY_BAD;
 
-			mutex_unlock(&cpufreq_lock);
-			exynos_target(policy, locking_frequency,
-				      CPUFREQ_RELATION_H);
-			mutex_lock(&cpufreq_lock);
-		}
 		break;
 
 	case PM_POST_SUSPEND:
-		if (saved_frequency) {
-			/*
-			 * While frequency_locked, only locking_frequency
-			 * is valid for target(). In order to use
-			 * saved_frequency while keeping frequency_locked,
-			 * we temporarly overwrite locking_frequency.
-			 */
-			temp = locking_frequency;
-			locking_frequency = saved_frequency;
-
-			mutex_unlock(&cpufreq_lock);
-			exynos_target(policy, locking_frequency,
-				      CPUFREQ_RELATION_H);
-			mutex_lock(&cpufreq_lock);
-
-			locking_frequency = temp;
-		}
+		mutex_lock(&cpufreq_lock);
 		frequency_locked = false;
+		mutex_unlock(&cpufreq_lock);
 		break;
 	}
-out:
-	mutex_unlock(&cpufreq_lock);
 
 	return NOTIFY_OK;
 }