ACPI and power management fixes and new device IDs for 3.13-rc6

- Fix for a cpufreq regression causing stale sysfs files to be left
   behind during system resume if cpufreq_add_dev() fails for one or
   more CPUs from Viresh Kumar.
 
 - Fix for a bug in cpufreq causing CONFIG_CPU_FREQ_DEFAULT_* to be
   ignored when the intel_pstate driver is used from Jason Baron.
 
 - System suspend fix for a memory leak in pm_vt_switch_unregister()
   that forgot to release objects after removing them from
   pm_vt_switch_list.  From Masami Ichikawa.
 
 - Intel Valley View device ID and energy unit encoding update for the
   (recently added) Intel RAPL (Running Average Power Limit) driver
   from Jacob Pan.
 
 - Intel Bay Trail SoC GPIO and ACPI device IDs for the Low Power
   Subsystem (LPSS) ACPI driver from Paul Drews.
 
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Merge tag 'pm+acpi-3.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes and new device IDs from Rafael Wysocki:

 - Fix for a cpufreq regression causing stale sysfs files to be left
   behind during system resume if cpufreq_add_dev() fails for one or
   more CPUs from Viresh Kumar.

 - Fix for a bug in cpufreq causing CONFIG_CPU_FREQ_DEFAULT_* to be
   ignored when the intel_pstate driver is used from Jason Baron.

 - System suspend fix for a memory leak in pm_vt_switch_unregister()
   that forgot to release objects after removing them from
   pm_vt_switch_list.  From Masami Ichikawa.

 - Intel Valley View device ID and energy unit encoding update for the
   (recently added) Intel RAPL (Running Average Power Limit) driver from
   Jacob Pan.

 - Intel Bay Trail SoC GPIO and ACPI device IDs for the Low Power
   Subsystem (LPSS) ACPI driver from Paul Drews.

* tag 'pm+acpi-3.13-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  powercap / RAPL: add support for ValleyView Soc
  PM / sleep: Fix memory leak in pm_vt_switch_unregister().
  cpufreq: Use CONFIG_CPU_FREQ_DEFAULT_* to set initial policy for setpolicy drivers
  cpufreq: remove sysfs files for CPUs which failed to come back after resume
  ACPI: Add BayTrail SoC GPIO and LPSS ACPI IDs

drivers/acpi/acpi_lpss.c

@@ -162,6 +162,7 @@ static const struct acpi_device_id acpi_lpss_device_ids[] = {
 	{ "80860F14", (unsigned long)&byt_sdio_dev_desc },
 	{ "80860F41", (unsigned long)&byt_i2c_dev_desc },
 	{ "INT33B2", },
+	{ "INT33FC", },
 
 	{ "INT3430", (unsigned long)&lpt_dev_desc },
 	{ "INT3431", (unsigned long)&lpt_dev_desc },

drivers/cpufreq/cpufreq.c

@@ -828,6 +828,12 @@ static void cpufreq_init_policy(struct cpufreq_policy *policy)
 	int ret = 0;
 
 	memcpy(&new_policy, policy, sizeof(*policy));
+
+	/* Use the default policy if its valid. */
+	if (cpufreq_driver->setpolicy)
+		cpufreq_parse_governor(policy->governor->name,
+					&new_policy.policy, NULL);
+
 	/* assure that the starting sequence is run in cpufreq_set_policy */
 	policy->governor = NULL;
 
@@ -845,8 +851,7 @@ static void cpufreq_init_policy(struct cpufreq_policy *policy)
 
 #ifdef CONFIG_HOTPLUG_CPU
 static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy,
-				  unsigned int cpu, struct device *dev,
-				  bool frozen)
+				  unsigned int cpu, struct device *dev)
 {
 	int ret = 0;
 	unsigned long flags;
@@ -877,11 +882,7 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy,
 		}
 	}
 
-	/* Don't touch sysfs links during light-weight init */
-	if (!frozen)
-		ret = sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq");
-
-	return ret;
+	return sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq");
 }
 #endif
 
@@ -926,6 +927,27 @@ err_free_policy:
 	return NULL;
 }
 
+static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
+{
+	struct kobject *kobj;
+	struct completion *cmp;
+
+	down_read(&policy->rwsem);
+	kobj = &policy->kobj;
+	cmp = &policy->kobj_unregister;
+	up_read(&policy->rwsem);
+	kobject_put(kobj);
+
+	/*
+	 * We need to make sure that the underlying kobj is
+	 * actually not referenced anymore by anybody before we
+	 * proceed with unloading.
+	 */
+	pr_debug("waiting for dropping of refcount\n");
+	wait_for_completion(cmp);
+	pr_debug("wait complete\n");
+}
+
 static void cpufreq_policy_free(struct cpufreq_policy *policy)
 {
 	free_cpumask_var(policy->related_cpus);
@@ -986,7 +1008,7 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
 	list_for_each_entry(tpolicy, &cpufreq_policy_list, policy_list) {
 		if (cpumask_test_cpu(cpu, tpolicy->related_cpus)) {
 			read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-			ret = cpufreq_add_policy_cpu(tpolicy, cpu, dev, frozen);
+			ret = cpufreq_add_policy_cpu(tpolicy, cpu, dev);
 			up_read(&cpufreq_rwsem);
 			return ret;
 		}
@@ -1096,7 +1118,10 @@ err_get_freq:
 	if (cpufreq_driver->exit)
 		cpufreq_driver->exit(policy);
 err_set_policy_cpu:
+	if (frozen)
+		cpufreq_policy_put_kobj(policy);
 	cpufreq_policy_free(policy);
+
 nomem_out:
 	up_read(&cpufreq_rwsem);
 
@@ -1118,7 +1143,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 }
 
 static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy,
-					   unsigned int old_cpu, bool frozen)
+					   unsigned int old_cpu)
 {
 	struct device *cpu_dev;
 	int ret;
@@ -1126,10 +1151,6 @@ static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy,
 	/* first sibling now owns the new sysfs dir */
 	cpu_dev = get_cpu_device(cpumask_any_but(policy->cpus, old_cpu));
 
-	/* Don't touch sysfs files during light-weight tear-down */
-	if (frozen)
-		return cpu_dev->id;
-
 	sysfs_remove_link(&cpu_dev->kobj, "cpufreq");
 	ret = kobject_move(&policy->kobj, &cpu_dev->kobj);
 	if (ret) {
@@ -1196,7 +1217,7 @@ static int __cpufreq_remove_dev_prepare(struct device *dev,
 		if (!frozen)
 			sysfs_remove_link(&dev->kobj, "cpufreq");
 	} else if (cpus > 1) {
-		new_cpu = cpufreq_nominate_new_policy_cpu(policy, cpu, frozen);
+		new_cpu = cpufreq_nominate_new_policy_cpu(policy, cpu);
 		if (new_cpu >= 0) {
 			update_policy_cpu(policy, new_cpu);
 
@@ -1218,8 +1239,6 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
 	int ret;
 	unsigned long flags;
 	struct cpufreq_policy *policy;
-	struct kobject *kobj;
-	struct completion *cmp;
 
 	read_lock_irqsave(&cpufreq_driver_lock, flags);
 	policy = per_cpu(cpufreq_cpu_data, cpu);
@@ -1249,22 +1268,8 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
 			}
 		}
 
-		if (!frozen) {
-			down_read(&policy->rwsem);
-			kobj = &policy->kobj;
-			cmp = &policy->kobj_unregister;
-			up_read(&policy->rwsem);
-			kobject_put(kobj);
-
-			/*
-			 * We need to make sure that the underlying kobj is
-			 * actually not referenced anymore by anybody before we
-			 * proceed with unloading.
-			 */
-			pr_debug("waiting for dropping of refcount\n");
-			wait_for_completion(cmp);
-			pr_debug("wait complete\n");
-		}
+		if (!frozen)
+			cpufreq_policy_put_kobj(policy);
 
 		/*
 		 * Perform the ->exit() even during light-weight tear-down,

drivers/pinctrl/pinctrl-baytrail.c

@@ -512,6 +512,7 @@ static const struct dev_pm_ops byt_gpio_pm_ops = {
 
 static const struct acpi_device_id byt_gpio_acpi_match[] = {
 	{ "INT33B2", 0 },
+	{ "INT33FC", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, byt_gpio_acpi_match);

drivers/powercap/intel_rapl.c

@@ -833,6 +833,11 @@ static int rapl_write_data_raw(struct rapl_domain *rd,
 	return 0;
 }
 
+static const struct x86_cpu_id energy_unit_quirk_ids[] = {
+	{ X86_VENDOR_INTEL, 6, 0x37},/* VLV */
+	{}
+};
+
 static int rapl_check_unit(struct rapl_package *rp, int cpu)
 {
 	u64 msr_val;
@@ -853,8 +858,11 @@ static int rapl_check_unit(struct rapl_package *rp, int cpu)
 	 * time unit: 1/time_unit_divisor Seconds
 	 */
 	value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
-	rp->energy_unit_divisor = 1 << value;
-
+	/* some CPUs have different way to calculate energy unit */
+	if (x86_match_cpu(energy_unit_quirk_ids))
+		rp->energy_unit_divisor = 1000000 / (1 << value);
+	else
+		rp->energy_unit_divisor = 1 << value;
 
 	value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
 	rp->power_unit_divisor = 1 << value;
@@ -941,6 +949,7 @@ static void package_power_limit_irq_restore(int package_id)
 static const struct x86_cpu_id rapl_ids[] = {
 	{ X86_VENDOR_INTEL, 6, 0x2a},/* SNB */
 	{ X86_VENDOR_INTEL, 6, 0x2d},/* SNB EP */
+	{ X86_VENDOR_INTEL, 6, 0x37},/* VLV */
 	{ X86_VENDOR_INTEL, 6, 0x3a},/* IVB */
 	{ X86_VENDOR_INTEL, 6, 0x45},/* HSW */
 	/* TODO: Add more CPU IDs after testing */

kernel/power/console.c

@@ -81,6 +81,7 @@ void pm_vt_switch_unregister(struct device *dev)
 	list_for_each_entry(tmp, &pm_vt_switch_list, head) {
 		if (tmp->dev == dev) {
 			list_del(&tmp->head);
+			kfree(tmp);
 			break;
 		}
 	}