Merge branch 'pm-cpufreq'

* pm-cpufreq:
  cpufreq: arm_big_little_dt: Instantiate as platform_driver
  cpufreq: arm_big_little_dt: Register driver only if DT has valid data
  cpufreq / e_powersaver: Fix linker error when ACPI processor is a module
  cpufreq / intel_pstate: Add additional supported CPU ID
  cpufreq: Drop rwsem lock around CPUFREQ_GOV_POLICY_EXIT

drivers/cpufreq/Kconfig.x86

@@ -272,7 +272,7 @@ config X86_LONGHAUL
 config X86_E_POWERSAVER
 	tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 	select CPU_FREQ_TABLE
-	depends on X86_32
+	depends on X86_32 && ACPI_PROCESSOR
 	help
 	  This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 	  does not have any safeguards to prevent operating the CPU out of spec

drivers/cpufreq/arm_big_little_dt.c

@@ -19,70 +19,75 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/opp.h>
+#include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include "arm_big_little.h"
 
-static int dt_init_opp_table(struct device *cpu_dev)
+/* get cpu node with valid operating-points */
+static struct device_node *get_cpu_node_with_valid_op(int cpu)
 {
-	struct device_node *np, *parent;
-	int count = 0, ret;
-
-	parent = of_find_node_by_path("/cpus");
-	if (!parent) {
-		pr_err("failed to find OF /cpus\n");
-		return -ENOENT;
-	}
-
-	for_each_child_of_node(parent, np) {
-		if (count++ != cpu_dev->id)
-			continue;
-		if (!of_get_property(np, "operating-points", NULL)) {
-			ret = -ENODATA;
-		} else {
-			cpu_dev->of_node = np;
-			ret = of_init_opp_table(cpu_dev);
-		}
-		of_node_put(np);
-		of_node_put(parent);
-
-		return ret;
-	}
-
-	return -ENODEV;
-}
-
-static int dt_get_transition_latency(struct device *cpu_dev)
-{
-	struct device_node *np, *parent;
-	u32 transition_latency = CPUFREQ_ETERNAL;
+	struct device_node *np = NULL, *parent;
 	int count = 0;
 
 	parent = of_find_node_by_path("/cpus");
 	if (!parent) {
-		pr_info("Failed to find OF /cpus. Use CPUFREQ_ETERNAL transition latency\n");
-		return CPUFREQ_ETERNAL;
+		pr_err("failed to find OF /cpus\n");
+		return NULL;
 	}
 
 	for_each_child_of_node(parent, np) {
-		if (count++ != cpu_dev->id)
+		if (count++ != cpu)
 			continue;
+		if (!of_get_property(np, "operating-points", NULL)) {
+			of_node_put(np);
+			np = NULL;
+		}
 
-		of_property_read_u32(np, "clock-latency", &transition_latency);
-		of_node_put(np);
-		of_node_put(parent);
-
-		return transition_latency;
+		break;
 	}
 
-	pr_info("clock-latency isn't found, use CPUFREQ_ETERNAL transition latency\n");
-	return CPUFREQ_ETERNAL;
+	of_node_put(parent);
+	return np;
+}
+
+static int dt_init_opp_table(struct device *cpu_dev)
+{
+	struct device_node *np;
+	int ret;
+
+	np = get_cpu_node_with_valid_op(cpu_dev->id);
+	if (!np)
+		return -ENODATA;
+
+	cpu_dev->of_node = np;
+	ret = of_init_opp_table(cpu_dev);
+	of_node_put(np);
+
+	return ret;
+}
+
+static int dt_get_transition_latency(struct device *cpu_dev)
+{
+	struct device_node *np;
+	u32 transition_latency = CPUFREQ_ETERNAL;
+
+	np = get_cpu_node_with_valid_op(cpu_dev->id);
+	if (!np)
+		return CPUFREQ_ETERNAL;
+
+	of_property_read_u32(np, "clock-latency", &transition_latency);
+	of_node_put(np);
+
+	pr_debug("%s: clock-latency: %d\n", __func__, transition_latency);
+	return transition_latency;
 }
 
 static struct cpufreq_arm_bL_ops dt_bL_ops = {
@@ -91,17 +96,33 @@ static struct cpufreq_arm_bL_ops dt_bL_ops = {
 	.init_opp_table = dt_init_opp_table,
 };
 
-static int generic_bL_init(void)
+static int generic_bL_probe(struct platform_device *pdev)
 {
+	struct device_node *np;
+
+	np = get_cpu_node_with_valid_op(0);
+	if (!np)
+		return -ENODEV;
+
+	of_node_put(np);
 	return bL_cpufreq_register(&dt_bL_ops);
 }
-module_init(generic_bL_init);
 
-static void generic_bL_exit(void)
+static int generic_bL_remove(struct platform_device *pdev)
 {
-	return bL_cpufreq_unregister(&dt_bL_ops);
+	bL_cpufreq_unregister(&dt_bL_ops);
+	return 0;
 }
-module_exit(generic_bL_exit);
+
+static struct platform_driver generic_bL_platdrv = {
+	.driver = {
+		.name	= "arm-bL-cpufreq-dt",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= generic_bL_probe,
+	.remove		= generic_bL_remove,
+};
+module_platform_driver(generic_bL_platdrv);
 
 MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
 MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");

drivers/cpufreq/cpufreq.c

@@ -1729,18 +1729,23 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
 			/* end old governor */
 			if (data->governor) {
 				__cpufreq_governor(data, CPUFREQ_GOV_STOP);
+				unlock_policy_rwsem_write(policy->cpu);
 				__cpufreq_governor(data,
 						CPUFREQ_GOV_POLICY_EXIT);
+				lock_policy_rwsem_write(policy->cpu);
 			}
 
 			/* start new governor */
 			data->governor = policy->governor;
 			if (!__cpufreq_governor(data, CPUFREQ_GOV_POLICY_INIT)) {
-				if (!__cpufreq_governor(data, CPUFREQ_GOV_START))
+				if (!__cpufreq_governor(data, CPUFREQ_GOV_START)) {
 					failed = 0;
-				else
+				} else {
+					unlock_policy_rwsem_write(policy->cpu);
 					__cpufreq_governor(data,
 							CPUFREQ_GOV_POLICY_EXIT);
+					lock_policy_rwsem_write(policy->cpu);
+				}
 			}
 
 			if (failed) {

drivers/cpufreq/intel_pstate.c

@@ -521,6 +521,7 @@ static void intel_pstate_timer_func(unsigned long __data)
 static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
 	ICPU(0x2a, default_policy),
 	ICPU(0x2d, default_policy),
+	ICPU(0x3a, default_policy),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);