Merge branch 'pm-cpufreq'

* pm-cpufreq:
  cpufreq / intel_pstate: use vzalloc() instead of vmalloc()/memset(0)
  cpufreq, ondemand: Remove leftover debug line
  cpufreq / kirkwood: don't check resource with devm_ioremap_resource
  cpufreq / intel_pstate: remove #ifdef MODULE compile fence
  cpufreq / intel_pstate: Remove idle mode PID
  cpufreq / intel_pstate: fix ffmpeg regression
  cpufreq / intel_pstate: use lowest requested max performance
  cpufreq / intel_pstate: remove idle time and duration from sample and calculations
  cpufreq: Fix incorrect dependecies for ARM SA11xx drivers
  cpufreq: ARM big LITTLE: Fix Kconfig entries
  cpufreq: cpufreq-cpu0: Free parent node for error cases
  cpufreq: cpufreq-cpu0: defer probe when regulator is not ready
  cpufreq: Issue CPUFREQ_GOV_POLICY_EXIT notifier before dropping policy refcount
  cpufreq: governors: Fix CPUFREQ_GOV_POLICY_{INIT|EXIT} notifiers
  cpufreq: ARM big LITTLE: Improve print message
  cpufreq: ARM big LITTLE: Move cpu_to_cluster() to arm_big_little.h
  cpufreq: ARM big LITTLE DT: Return CPUFREQ_ETERNAL if clock-latency isn't found
  cpufreq: ARM big LITTLE DT: Return correct transition latency
  cpufreq: ARM big LITTLE: Select PM_OPP

drivers/cpufreq/Kconfig

@@ -47,7 +47,7 @@ config CPU_FREQ_STAT_DETAILS
 
 choice
 	prompt "Default CPUFreq governor"
-	default CPU_FREQ_DEFAULT_GOV_USERSPACE if CPU_FREQ_SA1100 || CPU_FREQ_SA1110
+	default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
 	default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 	help
 	  This option sets which CPUFreq governor shall be loaded at

drivers/cpufreq/Kconfig.arm

@@ -3,16 +3,17 @@
 #
 
 config ARM_BIG_LITTLE_CPUFREQ
-	tristate
-	depends on ARM_CPU_TOPOLOGY
+	tristate "Generic ARM big LITTLE CPUfreq driver"
+	depends on ARM_CPU_TOPOLOGY && PM_OPP && HAVE_CLK
+	help
+	  This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.
 
 config ARM_DT_BL_CPUFREQ
-	tristate "Generic ARM big LITTLE CPUfreq driver probed via DT"
-	select ARM_BIG_LITTLE_CPUFREQ
-	depends on OF && HAVE_CLK
+	tristate "Generic probing via DT for ARM big LITTLE CPUfreq driver"
+	depends on ARM_BIG_LITTLE_CPUFREQ && OF
 	help
-	  This enables the Generic CPUfreq driver for ARM big.LITTLE platform.
-	  This gets frequency tables from DT.
+	  This enables probing via DT for Generic CPUfreq driver for ARM
+	  big.LITTLE platform. This gets frequency tables from DT.
 
 config ARM_EXYNOS_CPUFREQ
 	bool "SAMSUNG EXYNOS SoCs"

drivers/cpufreq/arm_big_little.c

@@ -40,11 +40,6 @@ static struct clk *clk[MAX_CLUSTERS];
 static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS];
 static atomic_t cluster_usage[MAX_CLUSTERS] = {ATOMIC_INIT(0), ATOMIC_INIT(0)};
 
-static int cpu_to_cluster(int cpu)
-{
-	return topology_physical_package_id(cpu);
-}
-
 static unsigned int bL_cpufreq_get(unsigned int cpu)
 {
 	u32 cur_cluster = cpu_to_cluster(cpu);
@@ -192,7 +187,7 @@ static int bL_cpufreq_init(struct cpufreq_policy *policy)
 
 	cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
 
-	dev_info(cpu_dev, "CPU %d initialized\n", policy->cpu);
+	dev_info(cpu_dev, "%s: CPU %d initialized\n", __func__, policy->cpu);
 	return 0;
 }
 

drivers/cpufreq/arm_big_little.h

@@ -34,6 +34,11 @@ struct cpufreq_arm_bL_ops {
 	int (*init_opp_table)(struct device *cpu_dev);
 };
 
+static inline int cpu_to_cluster(int cpu)
+{
+	return topology_physical_package_id(cpu);
+}
+
 int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops);
 void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops);
 

drivers/cpufreq/arm_big_little_dt.c

@@ -66,8 +66,8 @@ static int dt_get_transition_latency(struct device *cpu_dev)
 
 	parent = of_find_node_by_path("/cpus");
 	if (!parent) {
-		pr_err("failed to find OF /cpus\n");
-		return -ENOENT;
+		pr_info("Failed to find OF /cpus. Use CPUFREQ_ETERNAL transition latency\n");
+		return CPUFREQ_ETERNAL;
 	}
 
 	for_each_child_of_node(parent, np) {
@@ -78,10 +78,11 @@ static int dt_get_transition_latency(struct device *cpu_dev)
 		of_node_put(np);
 		of_node_put(parent);
 
-		return 0;
+		return transition_latency;
 	}
 
-	return -ENODEV;
+	pr_info("clock-latency isn't found, use CPUFREQ_ETERNAL transition latency\n");
+	return CPUFREQ_ETERNAL;
 }
 
 static struct cpufreq_arm_bL_ops dt_bL_ops = {

drivers/cpufreq/cpufreq-cpu0.c

@@ -189,25 +189,36 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
 
 	if (!np) {
 		pr_err("failed to find cpu0 node\n");
-		return -ENOENT;
+		ret = -ENOENT;
+		goto out_put_parent;
 	}
 
 	cpu_dev = &pdev->dev;
 	cpu_dev->of_node = np;
 
+	cpu_reg = devm_regulator_get(cpu_dev, "cpu0");
+	if (IS_ERR(cpu_reg)) {
+		/*
+		 * If cpu0 regulator supply node is present, but regulator is
+		 * not yet registered, we should try defering probe.
+		 */
+		if (PTR_ERR(cpu_reg) == -EPROBE_DEFER) {
+			dev_err(cpu_dev, "cpu0 regulator not ready, retry\n");
+			ret = -EPROBE_DEFER;
+			goto out_put_node;
+		}
+		pr_warn("failed to get cpu0 regulator: %ld\n",
+			PTR_ERR(cpu_reg));
+		cpu_reg = NULL;
+	}
+
 	cpu_clk = devm_clk_get(cpu_dev, NULL);
 	if (IS_ERR(cpu_clk)) {
 		ret = PTR_ERR(cpu_clk);
 		pr_err("failed to get cpu0 clock: %d\n", ret);
 		goto out_put_node;
 	}
 
-	cpu_reg = devm_regulator_get(cpu_dev, "cpu0");
-	if (IS_ERR(cpu_reg)) {
-		pr_warn("failed to get cpu0 regulator\n");
-		cpu_reg = NULL;
-	}
-
 	ret = of_init_opp_table(cpu_dev);
 	if (ret) {
 		pr_err("failed to init OPP table: %d\n", ret);
@@ -264,6 +275,8 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
 	opp_free_cpufreq_table(cpu_dev, &freq_table);
 out_put_node:
 	of_node_put(np);
+out_put_parent:
+	of_node_put(parent);
 	return ret;
 }
 

drivers/cpufreq/cpufreq.c

@@ -1075,14 +1075,14 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
 				__func__, cpu_dev->id, cpu);
 	}
 
+	if ((cpus == 1) && (cpufreq_driver->target))
+		__cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
+
 	pr_debug("%s: removing link, cpu: %d\n", __func__, cpu);
 	cpufreq_cpu_put(data);
 
 	/* If cpu is last user of policy, free policy */
 	if (cpus == 1) {
-		if (cpufreq_driver->target)
-			__cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
-
 		lock_policy_rwsem_read(cpu);
 		kobj = &data->kobj;
 		cmp = &data->kobj_unregister;

drivers/cpufreq/cpufreq_governor.c

@@ -255,6 +255,7 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		if (have_governor_per_policy()) {
 			WARN_ON(dbs_data);
 		} else if (dbs_data) {
+			dbs_data->usage_count++;
 			policy->governor_data = dbs_data;
 			return 0;
 		}
@@ -266,6 +267,7 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		}
 
 		dbs_data->cdata = cdata;
+		dbs_data->usage_count = 1;
 		rc = cdata->init(dbs_data);
 		if (rc) {
 			pr_err("%s: POLICY_INIT: init() failed\n", __func__);
@@ -294,7 +296,8 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
 					latency * LATENCY_MULTIPLIER));
 
-		if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+		if ((cdata->governor == GOV_CONSERVATIVE) &&
+				(!policy->governor->initialized)) {
 			struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
 
 			cpufreq_register_notifier(cs_ops->notifier_block,
@@ -306,12 +309,12 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 
 		return 0;
 	case CPUFREQ_GOV_POLICY_EXIT:
-		if ((policy->governor->initialized == 1) ||
-				have_governor_per_policy()) {
+		if (!--dbs_data->usage_count) {
 			sysfs_remove_group(get_governor_parent_kobj(policy),
 					get_sysfs_attr(dbs_data));
 
-			if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+			if ((dbs_data->cdata->governor == GOV_CONSERVATIVE) &&
+				(policy->governor->initialized == 1)) {
 				struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
 
 				cpufreq_unregister_notifier(cs_ops->notifier_block,

drivers/cpufreq/cpufreq_governor.h

@@ -211,6 +211,7 @@ struct common_dbs_data {
 struct dbs_data {
 	struct common_dbs_data *cdata;
 	unsigned int min_sampling_rate;
+	int usage_count;
 	void *tuners;
 
 	/* dbs_mutex protects dbs_enable in governor start/stop */

drivers/cpufreq/cpufreq_ondemand.c

@@ -547,7 +547,6 @@ static int od_init(struct dbs_data *dbs_data)
 	tuners->io_is_busy = should_io_be_busy();
 
 	dbs_data->tuners = tuners;
-	pr_info("%s: tuners %p\n", __func__, tuners);
 	mutex_init(&dbs_data->mutex);
 	return 0;
 }