Merge branch 'pm-sleep'

* pm-sleep:
  ACPI / PM: Check low power idle constraints for debug only
  PM / s2idle: Rename platform operations structure
  PM / s2idle: Rename ->enter_freeze to ->enter_s2idle
  PM / s2idle: Rename freeze_state enum and related items
  PM / s2idle: Rename PM_SUSPEND_FREEZE to PM_SUSPEND_TO_IDLE
  ACPI / PM: Prefer suspend-to-idle over S3 on some systems
  platform/x86: intel-hid: Wake up Dell Latitude 7275 from suspend-to-idle
  PM / suspend: Define pr_fmt() in suspend.c
  PM / suspend: Use mem_sleep_labels[] strings in messages
  PM / sleep: Put pm_test under CONFIG_PM_SLEEP_DEBUG
  PM / sleep: Check pm_wakeup_pending() in __device_suspend_noirq()
  PM / core: Add error argument to dpm_show_time()
  PM / core: Split dpm_suspend_noirq() and dpm_resume_noirq()
  PM / s2idle: Rearrange the main suspend-to-idle loop
  PM / timekeeping: Print debug messages when requested
  PM / sleep: Mark suspend/hibernation start and finish
  PM / sleep: Do not print debug messages by default
  PM / suspend: Export pm_suspend_target_state

Documentation/ABI/testing/sysfs-power

@@ -273,3 +273,15 @@ Description:
 
 		This output is useful for system wakeup diagnostics of spurious
 		wakeup interrupts.
+
+What:		/sys/power/pm_debug_messages
+Date:		July 2017
+Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
+Description:
+		The /sys/power/pm_debug_messages file controls the printing
+		of debug messages from the system suspend/hiberbation
+		infrastructure to the kernel log.
+
+		Writing a "1" to this file enables the debug messages and
+		writing a "0" (default) to it disables them.  Reads from
+		this file return the current value.

Documentation/power/states.txt

@@ -35,7 +35,9 @@ only one way to cause the system to go into the Suspend-To-RAM state (write
 The default suspend mode (ie. the one to be used without writing anything into
 /sys/power/mem_sleep) is either "deep" (if Suspend-To-RAM is supported) or
 "s2idle", but it can be overridden by the value of the "mem_sleep_default"
-parameter in the kernel command line.
+parameter in the kernel command line.  On some ACPI-based systems, depending on
+the information in the FADT, the default may be "s2idle" even if Suspend-To-RAM
+is supported.
 
 The properties of all of the sleep states are described below.
 

arch/arm/mach-tegra/cpuidle-tegra114.c

@@ -60,7 +60,7 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
 	return index;
 }
 
-static void tegra114_idle_enter_freeze(struct cpuidle_device *dev,
+static void tegra114_idle_enter_s2idle(struct cpuidle_device *dev,
 				       struct cpuidle_driver *drv,
 				       int index)
 {
@@ -77,7 +77,7 @@ static struct cpuidle_driver tegra_idle_driver = {
 #ifdef CONFIG_PM_SLEEP
 		[1] = {
 			.enter			= tegra114_idle_power_down,
-			.enter_freeze		= tegra114_idle_enter_freeze,
+			.enter_s2idle		= tegra114_idle_enter_s2idle,
 			.exit_latency		= 500,
 			.target_residency	= 1000,
 			.flags			= CPUIDLE_FLAG_TIMER_STOP,

drivers/acpi/processor_idle.c

@@ -791,7 +791,7 @@ static int acpi_idle_enter(struct cpuidle_device *dev,
 	return index;
 }
 
-static void acpi_idle_enter_freeze(struct cpuidle_device *dev,
+static void acpi_idle_enter_s2idle(struct cpuidle_device *dev,
 				   struct cpuidle_driver *drv, int index)
 {
 	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
@@ -876,14 +876,14 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
 			drv->safe_state_index = count;
 		}
 		/*
-		 * Halt-induced C1 is not good for ->enter_freeze, because it
+		 * Halt-induced C1 is not good for ->enter_s2idle, because it
 		 * re-enables interrupts on exit.  Moreover, C1 is generally not
 		 * particularly interesting from the suspend-to-idle angle, so
 		 * avoid C1 and the situations in which we may need to fall back
 		 * to it altogether.
 		 */
 		if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr))
-			state->enter_freeze = acpi_idle_enter_freeze;
+			state->enter_s2idle = acpi_idle_enter_s2idle;
 
 		count++;
 		if (count == CPUIDLE_STATE_MAX)

drivers/acpi/sleep.c

@@ -669,6 +669,7 @@ static const struct acpi_device_id lps0_device_ids[] = {
 
 #define ACPI_LPS0_DSM_UUID	"c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 
+#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS	1
 #define ACPI_LPS0_SCREEN_OFF	3
 #define ACPI_LPS0_SCREEN_ON	4
 #define ACPI_LPS0_ENTRY		5
@@ -680,6 +681,166 @@ static acpi_handle lps0_device_handle;
 static guid_t lps0_dsm_guid;
 static char lps0_dsm_func_mask;
 
+/* Device constraint entry structure */
+struct lpi_device_info {
+	char *name;
+	int enabled;
+	union acpi_object *package;
+};
+
+/* Constraint package structure */
+struct lpi_device_constraint {
+	int uid;
+	int min_dstate;
+	int function_states;
+};
+
+struct lpi_constraints {
+	acpi_handle handle;
+	int min_dstate;
+};
+
+static struct lpi_constraints *lpi_constraints_table;
+static int lpi_constraints_table_size;
+
+static void lpi_device_get_constraints(void)
+{
+	union acpi_object *out_obj;
+	int i;
+
+	out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
+					  1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
+					  NULL, ACPI_TYPE_PACKAGE);
+
+	acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
+			  out_obj ? "successful" : "failed");
+
+	if (!out_obj)
+		return;
+
+	lpi_constraints_table = kcalloc(out_obj->package.count,
+					sizeof(*lpi_constraints_table),
+					GFP_KERNEL);
+	if (!lpi_constraints_table)
+		goto free_acpi_buffer;
+
+	acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
+
+	for (i = 0; i < out_obj->package.count; i++) {
+		struct lpi_constraints *constraint;
+		acpi_status status;
+		union acpi_object *package = &out_obj->package.elements[i];
+		struct lpi_device_info info = { };
+		int package_count = 0, j;
+
+		if (!package)
+			continue;
+
+		for (j = 0; j < package->package.count; ++j) {
+			union acpi_object *element =
+					&(package->package.elements[j]);
+
+			switch (element->type) {
+			case ACPI_TYPE_INTEGER:
+				info.enabled = element->integer.value;
+				break;
+			case ACPI_TYPE_STRING:
+				info.name = element->string.pointer;
+				break;
+			case ACPI_TYPE_PACKAGE:
+				package_count = element->package.count;
+				info.package = element->package.elements;
+				break;
+			}
+		}
+
+		if (!info.enabled || !info.package || !info.name)
+			continue;
+
+		constraint = &lpi_constraints_table[lpi_constraints_table_size];
+
+		status = acpi_get_handle(NULL, info.name, &constraint->handle);
+		if (ACPI_FAILURE(status))
+			continue;
+
+		acpi_handle_debug(lps0_device_handle,
+				  "index:%d Name:%s\n", i, info.name);
+
+		constraint->min_dstate = -1;
+
+		for (j = 0; j < package_count; ++j) {
+			union acpi_object *info_obj = &info.package[j];
+			union acpi_object *cnstr_pkg;
+			union acpi_object *obj;
+			struct lpi_device_constraint dev_info;
+
+			switch (info_obj->type) {
+			case ACPI_TYPE_INTEGER:
+				/* version */
+				break;
+			case ACPI_TYPE_PACKAGE:
+				if (info_obj->package.count < 2)
+					break;
+
+				cnstr_pkg = info_obj->package.elements;
+				obj = &cnstr_pkg[0];
+				dev_info.uid = obj->integer.value;
+				obj = &cnstr_pkg[1];
+				dev_info.min_dstate = obj->integer.value;
+
+				acpi_handle_debug(lps0_device_handle,
+					"uid:%d min_dstate:%s\n",
+					dev_info.uid,
+					acpi_power_state_string(dev_info.min_dstate));
+
+				constraint->min_dstate = dev_info.min_dstate;
+				break;
+			}
+		}
+
+		if (constraint->min_dstate < 0) {
+			acpi_handle_debug(lps0_device_handle,
+					  "Incomplete constraint defined\n");
+			continue;
+		}
+
+		lpi_constraints_table_size++;
+	}
+
+	acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
+
+free_acpi_buffer:
+	ACPI_FREE(out_obj);
+}
+
+static void lpi_check_constraints(void)
+{
+	int i;
+
+	for (i = 0; i < lpi_constraints_table_size; ++i) {
+		struct acpi_device *adev;
+
+		if (acpi_bus_get_device(lpi_constraints_table[i].handle, &adev))
+			continue;
+
+		acpi_handle_debug(adev->handle,
+			"LPI: required min power state:%s current power state:%s\n",
+			acpi_power_state_string(lpi_constraints_table[i].min_dstate),
+			acpi_power_state_string(adev->power.state));
+
+		if (!adev->flags.power_manageable) {
+			acpi_handle_info(adev->handle, "LPI: Device not power manageble\n");
+			continue;
+		}
+
+		if (adev->power.state < lpi_constraints_table[i].min_dstate)
+			acpi_handle_info(adev->handle,
+				"LPI: Constraint not met; min power state:%s current power state:%s\n",
+				acpi_power_state_string(lpi_constraints_table[i].min_dstate),
+				acpi_power_state_string(adev->power.state));
+	}
+}
+
 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 {
 	union acpi_object *out_obj;
@@ -714,6 +875,12 @@ static int lps0_device_attach(struct acpi_device *adev,
 		if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) {
 			lps0_dsm_func_mask = bitmask;
 			lps0_device_handle = adev->handle;
+			/*
+			 * Use suspend-to-idle by default if the default
+			 * suspend mode was not set from the command line.
+			 */
+			if (mem_sleep_default > PM_SUSPEND_MEM)
+				mem_sleep_current = PM_SUSPEND_TO_IDLE;
 		}
 
 		acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
@@ -723,6 +890,9 @@ static int lps0_device_attach(struct acpi_device *adev,
 				  "_DSM function 0 evaluation failed\n");
 	}
 	ACPI_FREE(out_obj);
+
+	lpi_device_get_constraints();
+
 	return 0;
 }
 
@@ -731,14 +901,14 @@ static struct acpi_scan_handler lps0_handler = {
 	.attach = lps0_device_attach,
 };
 
-static int acpi_freeze_begin(void)
+static int acpi_s2idle_begin(void)
 {
 	acpi_scan_lock_acquire();
 	s2idle_in_progress = true;
 	return 0;
 }
 
-static int acpi_freeze_prepare(void)
+static int acpi_s2idle_prepare(void)
 {
 	if (lps0_device_handle) {
 		acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
@@ -758,8 +928,12 @@ static int acpi_freeze_prepare(void)
 	return 0;
 }
 
-static void acpi_freeze_wake(void)
+static void acpi_s2idle_wake(void)
 {
+
+	if (pm_debug_messages_on)
+		lpi_check_constraints();
+
 	/*
 	 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
 	 * that the SCI has triggered while suspended, so cancel the wakeup in
@@ -772,7 +946,7 @@ static void acpi_freeze_wake(void)
 	}
 }
 
-static void acpi_freeze_sync(void)
+static void acpi_s2idle_sync(void)
 {
 	/*
 	 * Process all pending events in case there are any wakeup ones.
@@ -785,7 +959,7 @@ static void acpi_freeze_sync(void)
 	s2idle_wakeup = false;
 }
 
-static void acpi_freeze_restore(void)
+static void acpi_s2idle_restore(void)
 {
 	if (acpi_sci_irq_valid())
 		disable_irq_wake(acpi_sci_irq);
@@ -798,19 +972,19 @@ static void acpi_freeze_restore(void)
 	}
 }
 
-static void acpi_freeze_end(void)
+static void acpi_s2idle_end(void)
 {
 	s2idle_in_progress = false;
 	acpi_scan_lock_release();
 }
 
-static const struct platform_freeze_ops acpi_freeze_ops = {
-	.begin = acpi_freeze_begin,
-	.prepare = acpi_freeze_prepare,
-	.wake = acpi_freeze_wake,
-	.sync = acpi_freeze_sync,
-	.restore = acpi_freeze_restore,
-	.end = acpi_freeze_end,
+static const struct platform_s2idle_ops acpi_s2idle_ops = {
+	.begin = acpi_s2idle_begin,
+	.prepare = acpi_s2idle_prepare,
+	.wake = acpi_s2idle_wake,
+	.sync = acpi_s2idle_sync,
+	.restore = acpi_s2idle_restore,
+	.end = acpi_s2idle_end,
 };
 
 static void acpi_sleep_suspend_setup(void)
@@ -825,7 +999,7 @@ static void acpi_sleep_suspend_setup(void)
 		&acpi_suspend_ops_old : &acpi_suspend_ops);
 
 	acpi_scan_add_handler(&lps0_handler);
-	freeze_set_ops(&acpi_freeze_ops);
+	s2idle_set_ops(&acpi_s2idle_ops);
 }
 
 #else /* !CONFIG_SUSPEND */

drivers/base/power/main.c

@@ -418,8 +418,7 @@ static void pm_dev_err(struct device *dev, pm_message_t state, const char *info,
 		dev_name(dev), pm_verb(state.event), info, error);
 }
 
-#ifdef CONFIG_PM_DEBUG
-static void dpm_show_time(ktime_t starttime, pm_message_t state,
+static void dpm_show_time(ktime_t starttime, pm_message_t state, int error,
 			  const char *info)
 {
 	ktime_t calltime;
@@ -432,14 +431,12 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state,
 	usecs = usecs64;
 	if (usecs == 0)
 		usecs = 1;
-	pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",
+
+	pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n",
 		  info ?: "", info ? " " : "", pm_verb(state.event),
+		  error ? "aborted" : "complete",
 		  usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
 }
-#else
-static inline void dpm_show_time(ktime_t starttime, pm_message_t state,
-				 const char *info) {}
-#endif /* CONFIG_PM_DEBUG */
 
 static int dpm_run_callback(pm_callback_t cb, struct device *dev,
 			    pm_message_t state, const char *info)
@@ -602,14 +599,7 @@ static void async_resume_noirq(void *data, async_cookie_t cookie)
 	put_device(dev);
 }
 
-/**
- * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
- * @state: PM transition of the system being carried out.
- *
- * Call the "noirq" resume handlers for all devices in dpm_noirq_list and
- * enable device drivers to receive interrupts.
- */
-void dpm_resume_noirq(pm_message_t state)
+void dpm_noirq_resume_devices(pm_message_t state)
 {
 	struct device *dev;
 	ktime_t starttime = ktime_get();
@@ -654,11 +644,28 @@ void dpm_resume_noirq(pm_message_t state)
 	}
 	mutex_unlock(&dpm_list_mtx);
 	async_synchronize_full();
-	dpm_show_time(starttime, state, "noirq");
+	dpm_show_time(starttime, state, 0, "noirq");
+	trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
+}
+
+void dpm_noirq_end(void)
+{
 	resume_device_irqs();
 	device_wakeup_disarm_wake_irqs();
 	cpuidle_resume();
-	trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
+}
+
+/**
+ * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
+ * @state: PM transition of the system being carried out.
+ *
+ * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and
+ * allow device drivers' interrupt handlers to be called.
+ */
+void dpm_resume_noirq(pm_message_t state)
+{
+	dpm_noirq_resume_devices(state);
+	dpm_noirq_end();
 }
 
 /**
@@ -776,7 +783,7 @@ void dpm_resume_early(pm_message_t state)
 	}
 	mutex_unlock(&dpm_list_mtx);
 	async_synchronize_full();
-	dpm_show_time(starttime, state, "early");
+	dpm_show_time(starttime, state, 0, "early");
 	trace_suspend_resume(TPS("dpm_resume_early"), state.event, false);
 }
 
@@ -948,7 +955,7 @@ void dpm_resume(pm_message_t state)
 	}
 	mutex_unlock(&dpm_list_mtx);
 	async_synchronize_full();
-	dpm_show_time(starttime, state, NULL);
+	dpm_show_time(starttime, state, 0, NULL);
 
 	cpufreq_resume();
 	trace_suspend_resume(TPS("dpm_resume"), state.event, false);
@@ -1098,6 +1105,11 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
 	if (async_error)
 		goto Complete;
 
+	if (pm_wakeup_pending()) {
+		async_error = -EBUSY;
+		goto Complete;
+	}
+
 	if (dev->power.syscore || dev->power.direct_complete)
 		goto Complete;
 
@@ -1158,22 +1170,19 @@ static int device_suspend_noirq(struct device *dev)
 	return __device_suspend_noirq(dev, pm_transition, false);
 }
 
-/**
- * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
- * @state: PM transition of the system being carried out.
- *
- * Prevent device drivers from receiving interrupts and call the "noirq" suspend
- * handlers for all non-sysdev devices.
- */
-int dpm_suspend_noirq(pm_message_t state)
+void dpm_noirq_begin(void)
+{
+	cpuidle_pause();
+	device_wakeup_arm_wake_irqs();
+	suspend_device_irqs();
+}
+
+int dpm_noirq_suspend_devices(pm_message_t state)
 {
 	ktime_t starttime = ktime_get();
 	int error = 0;
 
 	trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
-	cpuidle_pause();
-	device_wakeup_arm_wake_irqs();
-	suspend_device_irqs();
 	mutex_lock(&dpm_list_mtx);
 	pm_transition = state;
 	async_error = 0;
@@ -1208,14 +1217,31 @@ int dpm_suspend_noirq(pm_message_t state)
 	if (error) {
 		suspend_stats.failed_suspend_noirq++;
 		dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
-		dpm_resume_noirq(resume_event(state));
-	} else {
-		dpm_show_time(starttime, state, "noirq");
 	}
+	dpm_show_time(starttime, state, error, "noirq");
 	trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
 	return error;
 }
 
+/**
+ * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
+ * @state: PM transition of the system being carried out.
+ *
+ * Prevent device drivers' interrupt handlers from being called and invoke
+ * "noirq" suspend callbacks for all non-sysdev devices.
+ */
+int dpm_suspend_noirq(pm_message_t state)
+{
+	int ret;
+
+	dpm_noirq_begin();
+	ret = dpm_noirq_suspend_devices(state);
+	if (ret)
+		dpm_resume_noirq(resume_event(state));
+
+	return ret;
+}
+
 /**
  * device_suspend_late - Execute a "late suspend" callback for given device.
  * @dev: Device to handle.
@@ -1350,9 +1376,8 @@ int dpm_suspend_late(pm_message_t state)
 		suspend_stats.failed_suspend_late++;
 		dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
 		dpm_resume_early(resume_event(state));
-	} else {
-		dpm_show_time(starttime, state, "late");
 	}
+	dpm_show_time(starttime, state, error, "late");
 	trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false);
 	return error;
 }
@@ -1618,8 +1643,8 @@ int dpm_suspend(pm_message_t state)
 	if (error) {
 		suspend_stats.failed_suspend++;
 		dpm_save_failed_step(SUSPEND_SUSPEND);
-	} else
-		dpm_show_time(starttime, state, NULL);
+	}
+	dpm_show_time(starttime, state, error, NULL);
 	trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
 	return error;
 }

drivers/base/power/wakeup.c

@@ -865,7 +865,7 @@ bool pm_wakeup_pending(void)
 void pm_system_wakeup(void)
 {
 	atomic_inc(&pm_abort_suspend);
-	freeze_wake();
+	s2idle_wake();
 }
 EXPORT_SYMBOL_GPL(pm_system_wakeup);
 

drivers/cpuidle/cpuidle.c

@@ -77,7 +77,7 @@ static int find_deepest_state(struct cpuidle_driver *drv,
 			      struct cpuidle_device *dev,
 			      unsigned int max_latency,
 			      unsigned int forbidden_flags,
-			      bool freeze)
+			      bool s2idle)
 {
 	unsigned int latency_req = 0;
 	int i, ret = 0;
@@ -89,7 +89,7 @@ static int find_deepest_state(struct cpuidle_driver *drv,
 		if (s->disabled || su->disable || s->exit_latency <= latency_req
 		    || s->exit_latency > max_latency
 		    || (s->flags & forbidden_flags)
-		    || (freeze && !s->enter_freeze))
+		    || (s2idle && !s->enter_s2idle))
 			continue;
 
 		latency_req = s->exit_latency;
@@ -128,7 +128,7 @@ int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
 }
 
 #ifdef CONFIG_SUSPEND
-static void enter_freeze_proper(struct cpuidle_driver *drv,
+static void enter_s2idle_proper(struct cpuidle_driver *drv,
 				struct cpuidle_device *dev, int index)
 {
 	/*
@@ -143,7 +143,7 @@ static void enter_freeze_proper(struct cpuidle_driver *drv,
 	 * suspended is generally unsafe.
 	 */
 	stop_critical_timings();
-	drv->states[index].enter_freeze(dev, drv, index);
+	drv->states[index].enter_s2idle(dev, drv, index);
 	WARN_ON(!irqs_disabled());
 	/*
 	 * timekeeping_resume() that will be called by tick_unfreeze() for the
@@ -155,25 +155,25 @@ static void enter_freeze_proper(struct cpuidle_driver *drv,
 }
 
 /**
- * cpuidle_enter_freeze - Enter an idle state suitable for suspend-to-idle.
+ * cpuidle_enter_s2idle - Enter an idle state suitable for suspend-to-idle.
  * @drv: cpuidle driver for the given CPU.
  * @dev: cpuidle device for the given CPU.
  *
- * If there are states with the ->enter_freeze callback, find the deepest of
+ * If there are states with the ->enter_s2idle callback, find the deepest of
  * them and enter it with frozen tick.
  */
-int cpuidle_enter_freeze(struct cpuidle_driver *drv, struct cpuidle_device *dev)
+int cpuidle_enter_s2idle(struct cpuidle_driver *drv, struct cpuidle_device *dev)
 {
 	int index;
 
 	/*
-	 * Find the deepest state with ->enter_freeze present, which guarantees
+	 * Find the deepest state with ->enter_s2idle present, which guarantees
 	 * that interrupts won't be enabled when it exits and allows the tick to
 	 * be frozen safely.
 	 */
 	index = find_deepest_state(drv, dev, UINT_MAX, 0, true);
 	if (index > 0)
-		enter_freeze_proper(drv, dev, index);
+		enter_s2idle_proper(drv, dev, index);
 
 	return index;
 }

drivers/cpuidle/dt_idle_states.c

@@ -41,9 +41,9 @@ static int init_state_node(struct cpuidle_state *idle_state,
 	/*
 	 * Since this is not a "coupled" state, it's safe to assume interrupts
 	 * won't be enabled when it exits allowing the tick to be frozen
-	 * safely. So enter() can be also enter_freeze() callback.
+	 * safely. So enter() can be also enter_s2idle() callback.
 	 */
-	idle_state->enter_freeze = match_id->data;
+	idle_state->enter_s2idle = match_id->data;
 
 	err = of_property_read_u32(state_node, "wakeup-latency-us",
 				   &idle_state->exit_latency);

drivers/idle/intel_idle.c

@@ -97,7 +97,7 @@ static const struct idle_cpu *icpu;
 static struct cpuidle_device __percpu *intel_idle_cpuidle_devices;
 static int intel_idle(struct cpuidle_device *dev,
 			struct cpuidle_driver *drv, int index);
-static void intel_idle_freeze(struct cpuidle_device *dev,
+static void intel_idle_s2idle(struct cpuidle_device *dev,
 			      struct cpuidle_driver *drv, int index);
 static struct cpuidle_state *cpuidle_state_table;
 
@@ -132,7 +132,7 @@ static struct cpuidle_state nehalem_cstates[] = {
 		.exit_latency = 3,
 		.target_residency = 6,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -140,7 +140,7 @@ static struct cpuidle_state nehalem_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -148,7 +148,7 @@ static struct cpuidle_state nehalem_cstates[] = {
 		.exit_latency = 20,
 		.target_residency = 80,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -156,7 +156,7 @@ static struct cpuidle_state nehalem_cstates[] = {
 		.exit_latency = 200,
 		.target_residency = 800,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -169,7 +169,7 @@ static struct cpuidle_state snb_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -177,7 +177,7 @@ static struct cpuidle_state snb_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -185,7 +185,7 @@ static struct cpuidle_state snb_cstates[] = {
 		.exit_latency = 80,
 		.target_residency = 211,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -193,7 +193,7 @@ static struct cpuidle_state snb_cstates[] = {
 		.exit_latency = 104,
 		.target_residency = 345,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7",
 		.desc = "MWAIT 0x30",
@@ -201,7 +201,7 @@ static struct cpuidle_state snb_cstates[] = {
 		.exit_latency = 109,
 		.target_residency = 345,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -214,7 +214,7 @@ static struct cpuidle_state byt_cstates[] = {
 		.exit_latency = 1,
 		.target_residency = 1,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6N",
 		.desc = "MWAIT 0x58",
@@ -222,7 +222,7 @@ static struct cpuidle_state byt_cstates[] = {
 		.exit_latency = 300,
 		.target_residency = 275,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6S",
 		.desc = "MWAIT 0x52",
@@ -230,7 +230,7 @@ static struct cpuidle_state byt_cstates[] = {
 		.exit_latency = 500,
 		.target_residency = 560,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7",
 		.desc = "MWAIT 0x60",
@@ -238,7 +238,7 @@ static struct cpuidle_state byt_cstates[] = {
 		.exit_latency = 1200,
 		.target_residency = 4000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7S",
 		.desc = "MWAIT 0x64",
@@ -246,7 +246,7 @@ static struct cpuidle_state byt_cstates[] = {
 		.exit_latency = 10000,
 		.target_residency = 20000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -259,7 +259,7 @@ static struct cpuidle_state cht_cstates[] = {
 		.exit_latency = 1,
 		.target_residency = 1,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6N",
 		.desc = "MWAIT 0x58",
@@ -267,7 +267,7 @@ static struct cpuidle_state cht_cstates[] = {
 		.exit_latency = 80,
 		.target_residency = 275,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6S",
 		.desc = "MWAIT 0x52",
@@ -275,7 +275,7 @@ static struct cpuidle_state cht_cstates[] = {
 		.exit_latency = 200,
 		.target_residency = 560,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7",
 		.desc = "MWAIT 0x60",
@@ -283,7 +283,7 @@ static struct cpuidle_state cht_cstates[] = {
 		.exit_latency = 1200,
 		.target_residency = 4000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7S",
 		.desc = "MWAIT 0x64",
@@ -291,7 +291,7 @@ static struct cpuidle_state cht_cstates[] = {
 		.exit_latency = 10000,
 		.target_residency = 20000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -304,7 +304,7 @@ static struct cpuidle_state ivb_cstates[] = {
 		.exit_latency = 1,
 		.target_residency = 1,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -312,7 +312,7 @@ static struct cpuidle_state ivb_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -320,7 +320,7 @@ static struct cpuidle_state ivb_cstates[] = {
 		.exit_latency = 59,
 		.target_residency = 156,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -328,7 +328,7 @@ static struct cpuidle_state ivb_cstates[] = {
 		.exit_latency = 80,
 		.target_residency = 300,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7",
 		.desc = "MWAIT 0x30",
@@ -336,7 +336,7 @@ static struct cpuidle_state ivb_cstates[] = {
 		.exit_latency = 87,
 		.target_residency = 300,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -349,7 +349,7 @@ static struct cpuidle_state ivt_cstates[] = {
 		.exit_latency = 1,
 		.target_residency = 1,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -357,7 +357,7 @@ static struct cpuidle_state ivt_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 80,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -365,7 +365,7 @@ static struct cpuidle_state ivt_cstates[] = {
 		.exit_latency = 59,
 		.target_residency = 156,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -373,7 +373,7 @@ static struct cpuidle_state ivt_cstates[] = {
 		.exit_latency = 82,
 		.target_residency = 300,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -386,7 +386,7 @@ static struct cpuidle_state ivt_cstates_4s[] = {
 		.exit_latency = 1,
 		.target_residency = 1,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -394,7 +394,7 @@ static struct cpuidle_state ivt_cstates_4s[] = {
 		.exit_latency = 10,
 		.target_residency = 250,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -402,7 +402,7 @@ static struct cpuidle_state ivt_cstates_4s[] = {
 		.exit_latency = 59,
 		.target_residency = 300,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -410,7 +410,7 @@ static struct cpuidle_state ivt_cstates_4s[] = {
 		.exit_latency = 84,
 		.target_residency = 400,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -423,7 +423,7 @@ static struct cpuidle_state ivt_cstates_8s[] = {
 		.exit_latency = 1,
 		.target_residency = 1,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -431,7 +431,7 @@ static struct cpuidle_state ivt_cstates_8s[] = {
 		.exit_latency = 10,
 		.target_residency = 500,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -439,7 +439,7 @@ static struct cpuidle_state ivt_cstates_8s[] = {
 		.exit_latency = 59,
 		.target_residency = 600,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -447,7 +447,7 @@ static struct cpuidle_state ivt_cstates_8s[] = {
 		.exit_latency = 88,
 		.target_residency = 700,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -460,7 +460,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -468,7 +468,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -476,7 +476,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 33,
 		.target_residency = 100,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -484,7 +484,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 133,
 		.target_residency = 400,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7s",
 		.desc = "MWAIT 0x32",
@@ -492,7 +492,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 166,
 		.target_residency = 500,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C8",
 		.desc = "MWAIT 0x40",
@@ -500,7 +500,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 300,
 		.target_residency = 900,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C9",
 		.desc = "MWAIT 0x50",
@@ -508,7 +508,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 600,
 		.target_residency = 1800,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C10",
 		.desc = "MWAIT 0x60",
@@ -516,7 +516,7 @@ static struct cpuidle_state hsw_cstates[] = {
 		.exit_latency = 2600,
 		.target_residency = 7700,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -528,7 +528,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -536,7 +536,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -544,7 +544,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 40,
 		.target_residency = 100,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -552,7 +552,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 133,
 		.target_residency = 400,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7s",
 		.desc = "MWAIT 0x32",
@@ -560,7 +560,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 166,
 		.target_residency = 500,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C8",
 		.desc = "MWAIT 0x40",
@@ -568,7 +568,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 300,
 		.target_residency = 900,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C9",
 		.desc = "MWAIT 0x50",
@@ -576,7 +576,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 600,
 		.target_residency = 1800,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C10",
 		.desc = "MWAIT 0x60",
@@ -584,7 +584,7 @@ static struct cpuidle_state bdw_cstates[] = {
 		.exit_latency = 2600,
 		.target_residency = 7700,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -597,7 +597,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -605,7 +605,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C3",
 		.desc = "MWAIT 0x10",
@@ -613,7 +613,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 70,
 		.target_residency = 100,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -621,7 +621,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 85,
 		.target_residency = 200,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7s",
 		.desc = "MWAIT 0x33",
@@ -629,7 +629,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 124,
 		.target_residency = 800,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C8",
 		.desc = "MWAIT 0x40",
@@ -637,7 +637,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 200,
 		.target_residency = 800,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C9",
 		.desc = "MWAIT 0x50",
@@ -645,7 +645,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 480,
 		.target_residency = 5000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C10",
 		.desc = "MWAIT 0x60",
@@ -653,7 +653,7 @@ static struct cpuidle_state skl_cstates[] = {
 		.exit_latency = 890,
 		.target_residency = 5000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -666,7 +666,7 @@ static struct cpuidle_state skx_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -674,7 +674,7 @@ static struct cpuidle_state skx_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -682,7 +682,7 @@ static struct cpuidle_state skx_cstates[] = {
 		.exit_latency = 133,
 		.target_residency = 600,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -695,7 +695,7 @@ static struct cpuidle_state atom_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C2",
 		.desc = "MWAIT 0x10",
@@ -703,7 +703,7 @@ static struct cpuidle_state atom_cstates[] = {
 		.exit_latency = 20,
 		.target_residency = 80,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C4",
 		.desc = "MWAIT 0x30",
@@ -711,7 +711,7 @@ static struct cpuidle_state atom_cstates[] = {
 		.exit_latency = 100,
 		.target_residency = 400,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x52",
@@ -719,7 +719,7 @@ static struct cpuidle_state atom_cstates[] = {
 		.exit_latency = 140,
 		.target_residency = 560,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -731,7 +731,7 @@ static struct cpuidle_state tangier_cstates[] = {
 		.exit_latency = 1,
 		.target_residency = 4,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C4",
 		.desc = "MWAIT 0x30",
@@ -739,7 +739,7 @@ static struct cpuidle_state tangier_cstates[] = {
 		.exit_latency = 100,
 		.target_residency = 400,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x52",
@@ -747,7 +747,7 @@ static struct cpuidle_state tangier_cstates[] = {
 		.exit_latency = 140,
 		.target_residency = 560,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7",
 		.desc = "MWAIT 0x60",
@@ -755,7 +755,7 @@ static struct cpuidle_state tangier_cstates[] = {
 		.exit_latency = 1200,
 		.target_residency = 4000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C9",
 		.desc = "MWAIT 0x64",
@@ -763,7 +763,7 @@ static struct cpuidle_state tangier_cstates[] = {
 		.exit_latency = 10000,
 		.target_residency = 20000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -775,7 +775,7 @@ static struct cpuidle_state avn_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x51",
@@ -783,7 +783,7 @@ static struct cpuidle_state avn_cstates[] = {
 		.exit_latency = 15,
 		.target_residency = 45,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -795,7 +795,7 @@ static struct cpuidle_state knl_cstates[] = {
 		.exit_latency = 1,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze },
+		.enter_s2idle = intel_idle_s2idle },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x10",
@@ -803,7 +803,7 @@ static struct cpuidle_state knl_cstates[] = {
 		.exit_latency = 120,
 		.target_residency = 500,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze },
+		.enter_s2idle = intel_idle_s2idle },
 	{
 		.enter = NULL }
 };
@@ -816,7 +816,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -824,7 +824,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -832,7 +832,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 133,
 		.target_residency = 133,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C7s",
 		.desc = "MWAIT 0x31",
@@ -840,7 +840,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 155,
 		.target_residency = 155,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C8",
 		.desc = "MWAIT 0x40",
@@ -848,7 +848,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 1000,
 		.target_residency = 1000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C9",
 		.desc = "MWAIT 0x50",
@@ -856,7 +856,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 2000,
 		.target_residency = 2000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C10",
 		.desc = "MWAIT 0x60",
@@ -864,7 +864,7 @@ static struct cpuidle_state bxt_cstates[] = {
 		.exit_latency = 10000,
 		.target_residency = 10000,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -877,7 +877,7 @@ static struct cpuidle_state dnv_cstates[] = {
 		.exit_latency = 2,
 		.target_residency = 2,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C1E",
 		.desc = "MWAIT 0x01",
@@ -885,7 +885,7 @@ static struct cpuidle_state dnv_cstates[] = {
 		.exit_latency = 10,
 		.target_residency = 20,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.name = "C6",
 		.desc = "MWAIT 0x20",
@@ -893,7 +893,7 @@ static struct cpuidle_state dnv_cstates[] = {
 		.exit_latency = 50,
 		.target_residency = 500,
 		.enter = &intel_idle,
-		.enter_freeze = intel_idle_freeze, },
+		.enter_s2idle = intel_idle_s2idle, },
 	{
 		.enter = NULL }
 };
@@ -936,12 +936,12 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev,
 }
 
 /**
- * intel_idle_freeze - simplified "enter" callback routine for suspend-to-idle
+ * intel_idle_s2idle - simplified "enter" callback routine for suspend-to-idle
  * @dev: cpuidle_device
  * @drv: cpuidle driver
  * @index: state index
  */
-static void intel_idle_freeze(struct cpuidle_device *dev,
+static void intel_idle_s2idle(struct cpuidle_device *dev,
 			     struct cpuidle_driver *drv, int index)
 {
 	unsigned long ecx = 1; /* break on interrupt flag */
@@ -1338,7 +1338,7 @@ static void __init intel_idle_cpuidle_driver_init(void)
 		int num_substates, mwait_hint, mwait_cstate;
 
 		if ((cpuidle_state_table[cstate].enter == NULL) &&
-		    (cpuidle_state_table[cstate].enter_freeze == NULL))
+		    (cpuidle_state_table[cstate].enter_s2idle == NULL))
 			break;
 
 		if (cstate + 1 > max_cstate) {

drivers/platform/x86/intel-hid.c

@@ -203,15 +203,26 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
 	acpi_status status;
 
 	if (priv->wakeup_mode) {
+		/*
+		 * Needed for wakeup from suspend-to-idle to work on some
+		 * platforms that don't expose the 5-button array, but still
+		 * send notifies with the power button event code to this
+		 * device object on power button actions while suspended.
+		 */
+		if (event == 0xce)
+			goto wakeup;
+
 		/* Wake up on 5-button array events only. */
 		if (event == 0xc0 || !priv->array)
 			return;
 
-		if (sparse_keymap_entry_from_scancode(priv->array, event))
-			pm_wakeup_hard_event(&device->dev);
-		else
+		if (!sparse_keymap_entry_from_scancode(priv->array, event)) {
 			dev_info(&device->dev, "unknown event 0x%x\n", event);
+			return;
+		}
 
+wakeup:
+		pm_wakeup_hard_event(&device->dev);
 		return;
 	}
 

drivers/regulator/of_regulator.c

@@ -150,7 +150,7 @@ static void of_get_regulation_constraints(struct device_node *np,
 			suspend_state = &constraints->state_disk;
 			break;
 		case PM_SUSPEND_ON:
-		case PM_SUSPEND_FREEZE:
+		case PM_SUSPEND_TO_IDLE:
 		case PM_SUSPEND_STANDBY:
 		default:
 			continue;

include/linux/cpuidle.h

@@ -52,11 +52,11 @@ struct cpuidle_state {
 	int (*enter_dead) (struct cpuidle_device *dev, int index);
 
 	/*
-	 * CPUs execute ->enter_freeze with the local tick or entire timekeeping
+	 * CPUs execute ->enter_s2idle with the local tick or entire timekeeping
 	 * suspended, so it must not re-enable interrupts at any point (even
 	 * temporarily) or attempt to change states of clock event devices.
 	 */
-	void (*enter_freeze) (struct cpuidle_device *dev,
+	void (*enter_s2idle) (struct cpuidle_device *dev,
 			      struct cpuidle_driver *drv,
 			      int index);
 };
@@ -198,14 +198,14 @@ static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; }
 #ifdef CONFIG_CPU_IDLE
 extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
 				      struct cpuidle_device *dev);
-extern int cpuidle_enter_freeze(struct cpuidle_driver *drv,
+extern int cpuidle_enter_s2idle(struct cpuidle_driver *drv,
 				struct cpuidle_device *dev);
 extern void cpuidle_use_deepest_state(bool enable);
 #else
 static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
 					     struct cpuidle_device *dev)
 {return -ENODEV; }
-static inline int cpuidle_enter_freeze(struct cpuidle_driver *drv,
+static inline int cpuidle_enter_s2idle(struct cpuidle_driver *drv,
 				       struct cpuidle_device *dev)
 {return -ENODEV; }
 static inline void cpuidle_use_deepest_state(bool enable)

include/linux/pm.h

@@ -689,6 +689,8 @@ struct dev_pm_domain {
 extern void device_pm_lock(void);
 extern void dpm_resume_start(pm_message_t state);
 extern void dpm_resume_end(pm_message_t state);
+extern void dpm_noirq_resume_devices(pm_message_t state);
+extern void dpm_noirq_end(void);
 extern void dpm_resume_noirq(pm_message_t state);
 extern void dpm_resume_early(pm_message_t state);
 extern void dpm_resume(pm_message_t state);
@@ -697,6 +699,8 @@ extern void dpm_complete(pm_message_t state);
 extern void device_pm_unlock(void);
 extern int dpm_suspend_end(pm_message_t state);
 extern int dpm_suspend_start(pm_message_t state);
+extern void dpm_noirq_begin(void);
+extern int dpm_noirq_suspend_devices(pm_message_t state);
 extern int dpm_suspend_noirq(pm_message_t state);
 extern int dpm_suspend_late(pm_message_t state);
 extern int dpm_suspend(pm_message_t state);

include/linux/suspend.h

@@ -33,10 +33,10 @@ static inline void pm_restore_console(void)
 typedef int __bitwise suspend_state_t;
 
 #define PM_SUSPEND_ON		((__force suspend_state_t) 0)
-#define PM_SUSPEND_FREEZE	((__force suspend_state_t) 1)
+#define PM_SUSPEND_TO_IDLE	((__force suspend_state_t) 1)
 #define PM_SUSPEND_STANDBY	((__force suspend_state_t) 2)
 #define PM_SUSPEND_MEM		((__force suspend_state_t) 3)
-#define PM_SUSPEND_MIN		PM_SUSPEND_FREEZE
+#define PM_SUSPEND_MIN		PM_SUSPEND_TO_IDLE
 #define PM_SUSPEND_MAX		((__force suspend_state_t) 4)
 
 enum suspend_stat_step {
@@ -186,7 +186,7 @@ struct platform_suspend_ops {
 	void (*recover)(void);
 };
 
-struct platform_freeze_ops {
+struct platform_s2idle_ops {
 	int (*begin)(void);
 	int (*prepare)(void);
 	void (*wake)(void);
@@ -196,6 +196,9 @@ struct platform_freeze_ops {
 };
 
 #ifdef CONFIG_SUSPEND
+extern suspend_state_t mem_sleep_current;
+extern suspend_state_t mem_sleep_default;
+
 /**
  * suspend_set_ops - set platform dependent suspend operations
  * @ops: The new suspend operations to set.
@@ -234,22 +237,22 @@ static inline bool pm_resume_via_firmware(void)
 }
 
 /* Suspend-to-idle state machnine. */
-enum freeze_state {
-	FREEZE_STATE_NONE,      /* Not suspended/suspending. */
-	FREEZE_STATE_ENTER,     /* Enter suspend-to-idle. */
-	FREEZE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
+enum s2idle_states {
+	S2IDLE_STATE_NONE,      /* Not suspended/suspending. */
+	S2IDLE_STATE_ENTER,     /* Enter suspend-to-idle. */
+	S2IDLE_STATE_WAKE,      /* Wake up from suspend-to-idle. */
 };
 
-extern enum freeze_state __read_mostly suspend_freeze_state;
+extern enum s2idle_states __read_mostly s2idle_state;
 
-static inline bool idle_should_freeze(void)
+static inline bool idle_should_enter_s2idle(void)
 {
-	return unlikely(suspend_freeze_state == FREEZE_STATE_ENTER);
+	return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
 }
 
 extern void __init pm_states_init(void);
-extern void freeze_set_ops(const struct platform_freeze_ops *ops);
-extern void freeze_wake(void);
+extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
+extern void s2idle_wake(void);
 
 /**
  * arch_suspend_disable_irqs - disable IRQs for suspend
@@ -281,10 +284,10 @@ static inline bool pm_resume_via_firmware(void) { return false; }
 
 static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
-static inline bool idle_should_freeze(void) { return false; }
+static inline bool idle_should_enter_s2idle(void) { return false; }
 static inline void __init pm_states_init(void) {}
-static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
-static inline void freeze_wake(void) {}
+static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
+static inline void s2idle_wake(void) {}
 #endif /* !CONFIG_SUSPEND */
 
 /* struct pbe is used for creating lists of pages that should be restored
@@ -427,6 +430,7 @@ extern int unregister_pm_notifier(struct notifier_block *nb);
 /* drivers/base/power/wakeup.c */
 extern bool events_check_enabled;
 extern unsigned int pm_wakeup_irq;
+extern suspend_state_t pm_suspend_target_state;
 
 extern bool pm_wakeup_pending(void);
 extern void pm_system_wakeup(void);
@@ -491,10 +495,24 @@ static inline void unlock_system_sleep(void) {}
 
 #ifdef CONFIG_PM_SLEEP_DEBUG
 extern bool pm_print_times_enabled;
+extern bool pm_debug_messages_on;
+extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
 #else
 #define pm_print_times_enabled	(false)
+#define pm_debug_messages_on	(false)
+
+#include <linux/printk.h>
+
+#define __pm_pr_dbg(defer, fmt, ...) \
+	no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
 #endif
 
+#define pm_pr_dbg(fmt, ...) \
+	__pm_pr_dbg(false, fmt, ##__VA_ARGS__)
+
+#define pm_deferred_pr_dbg(fmt, ...) \
+	__pm_pr_dbg(true, fmt, ##__VA_ARGS__)
+
 #ifdef CONFIG_PM_AUTOSLEEP
 
 /* kernel/power/autosleep.c */

kernel/power/hibernate.c

@@ -651,7 +651,7 @@ static int load_image_and_restore(void)
 	int error;
 	unsigned int flags;
 
-	pr_debug("Loading hibernation image.\n");
+	pm_pr_dbg("Loading hibernation image.\n");
 
 	lock_device_hotplug();
 	error = create_basic_memory_bitmaps();
@@ -681,7 +681,7 @@ int hibernate(void)
 	bool snapshot_test = false;
 
 	if (!hibernation_available()) {
-		pr_debug("Hibernation not available.\n");
+		pm_pr_dbg("Hibernation not available.\n");
 		return -EPERM;
 	}
 
@@ -692,6 +692,7 @@ int hibernate(void)
 		goto Unlock;
 	}
 
+	pr_info("hibernation entry\n");
 	pm_prepare_console();
 	error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
 	if (error) {
@@ -727,7 +728,7 @@ int hibernate(void)
 		else
 		        flags |= SF_CRC32_MODE;
 
-		pr_debug("Writing image.\n");
+		pm_pr_dbg("Writing image.\n");
 		error = swsusp_write(flags);
 		swsusp_free();
 		if (!error) {
@@ -739,7 +740,7 @@ int hibernate(void)
 		in_suspend = 0;
 		pm_restore_gfp_mask();
 	} else {
-		pr_debug("Image restored successfully.\n");
+		pm_pr_dbg("Image restored successfully.\n");
 	}
 
  Free_bitmaps:
@@ -747,7 +748,7 @@ int hibernate(void)
  Thaw:
 	unlock_device_hotplug();
 	if (snapshot_test) {
-		pr_debug("Checking hibernation image\n");
+		pm_pr_dbg("Checking hibernation image\n");
 		error = swsusp_check();
 		if (!error)
 			error = load_image_and_restore();
@@ -762,6 +763,8 @@ int hibernate(void)
 	atomic_inc(&snapshot_device_available);
  Unlock:
 	unlock_system_sleep();
+	pr_info("hibernation exit\n");
+
 	return error;
 }
 
@@ -811,7 +814,7 @@ static int software_resume(void)
 		goto Unlock;
 	}
 
-	pr_debug("Checking hibernation image partition %s\n", resume_file);
+	pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
 
 	if (resume_delay) {
 		pr_info("Waiting %dsec before reading resume device ...\n",
@@ -853,10 +856,10 @@ static int software_resume(void)
 	}
 
  Check_image:
-	pr_debug("Hibernation image partition %d:%d present\n",
+	pm_pr_dbg("Hibernation image partition %d:%d present\n",
 		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
 
-	pr_debug("Looking for hibernation image.\n");
+	pm_pr_dbg("Looking for hibernation image.\n");
 	error = swsusp_check();
 	if (error)
 		goto Unlock;
@@ -868,6 +871,7 @@ static int software_resume(void)
 		goto Unlock;
 	}
 
+	pr_info("resume from hibernation\n");
 	pm_prepare_console();
 	error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
 	if (error) {
@@ -875,7 +879,7 @@ static int software_resume(void)
 		goto Close_Finish;
 	}
 
-	pr_debug("Preparing processes for restore.\n");
+	pm_pr_dbg("Preparing processes for restore.\n");
 	error = freeze_processes();
 	if (error)
 		goto Close_Finish;
@@ -884,11 +888,12 @@ static int software_resume(void)
  Finish:
 	__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
 	pm_restore_console();
+	pr_info("resume from hibernation failed (%d)\n", error);
 	atomic_inc(&snapshot_device_available);
 	/* For success case, the suspend path will release the lock */
  Unlock:
 	mutex_unlock(&pm_mutex);
-	pr_debug("Hibernation image not present or could not be loaded.\n");
+	pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
 	return error;
  Close_Finish:
 	swsusp_close(FMODE_READ);
@@ -1012,7 +1017,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
 		error = -EINVAL;
 
 	if (!error)
-		pr_debug("Hibernation mode set to '%s'\n",
+		pm_pr_dbg("Hibernation mode set to '%s'\n",
 			       hibernation_modes[mode]);
 	unlock_system_sleep();
 	return error ? error : n;

kernel/power/main.c

@@ -150,7 +150,7 @@ static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr
 power_attr(mem_sleep);
 #endif /* CONFIG_SUSPEND */
 
-#ifdef CONFIG_PM_DEBUG
+#ifdef CONFIG_PM_SLEEP_DEBUG
 int pm_test_level = TEST_NONE;
 
 static const char * const pm_tests[__TEST_AFTER_LAST] = {
@@ -211,7 +211,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
 }
 
 power_attr(pm_test);
-#endif /* CONFIG_PM_DEBUG */
+#endif /* CONFIG_PM_SLEEP_DEBUG */
 
 #ifdef CONFIG_DEBUG_FS
 static char *suspend_step_name(enum suspend_stat_step step)
@@ -361,6 +361,61 @@ static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
 
 power_attr_ro(pm_wakeup_irq);
 
+bool pm_debug_messages_on __read_mostly;
+
+static ssize_t pm_debug_messages_show(struct kobject *kobj,
+				      struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", pm_debug_messages_on);
+}
+
+static ssize_t pm_debug_messages_store(struct kobject *kobj,
+				       struct kobj_attribute *attr,
+				       const char *buf, size_t n)
+{
+	unsigned long val;
+
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
+
+	if (val > 1)
+		return -EINVAL;
+
+	pm_debug_messages_on = !!val;
+	return n;
+}
+
+power_attr(pm_debug_messages);
+
+/**
+ * __pm_pr_dbg - Print a suspend debug message to the kernel log.
+ * @defer: Whether or not to use printk_deferred() to print the message.
+ * @fmt: Message format.
+ *
+ * The message will be emitted if enabled through the pm_debug_messages
+ * sysfs attribute.
+ */
+void __pm_pr_dbg(bool defer, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	if (!pm_debug_messages_on)
+		return;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	if (defer)
+		printk_deferred(KERN_DEBUG "PM: %pV", &vaf);
+	else
+		printk(KERN_DEBUG "PM: %pV", &vaf);
+
+	va_end(args);
+}
+
 #else /* !CONFIG_PM_SLEEP_DEBUG */
 static inline void pm_print_times_init(void) {}
 #endif /* CONFIG_PM_SLEEP_DEBUG */
@@ -691,12 +746,11 @@ static struct attribute * g[] = {
 	&wake_lock_attr.attr,
 	&wake_unlock_attr.attr,
 #endif
-#ifdef CONFIG_PM_DEBUG
-	&pm_test_attr.attr,
-#endif
 #ifdef CONFIG_PM_SLEEP_DEBUG
+	&pm_test_attr.attr,
 	&pm_print_times_attr.attr,
 	&pm_wakeup_irq_attr.attr,
+	&pm_debug_messages_attr.attr,
 #endif
 #endif
 #ifdef CONFIG_FREEZER

kernel/power/power.h

@@ -192,7 +192,6 @@ extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
 extern const char * const pm_labels[];
 extern const char *pm_states[];
 extern const char *mem_sleep_states[];
-extern suspend_state_t mem_sleep_current;
 
 extern int suspend_devices_and_enter(suspend_state_t state);
 #else /* !CONFIG_SUSPEND */
@@ -245,7 +244,11 @@ enum {
 #define TEST_FIRST	TEST_NONE
 #define TEST_MAX	(__TEST_AFTER_LAST - 1)
 
+#ifdef CONFIG_PM_SLEEP_DEBUG
 extern int pm_test_level;
+#else
+#define pm_test_level	(TEST_NONE)
+#endif
 
 #ifdef CONFIG_SUSPEND_FREEZER
 static inline int suspend_freeze_processes(void)

kernel/power/suspend.c

@@ -8,6 +8,8 @@
  * This file is released under the GPLv2.
  */
 
+#define pr_fmt(fmt) "PM: " fmt
+
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
@@ -33,53 +35,55 @@
 #include "power.h"
 
 const char * const pm_labels[] = {
-	[PM_SUSPEND_FREEZE] = "freeze",
+	[PM_SUSPEND_TO_IDLE] = "freeze",
 	[PM_SUSPEND_STANDBY] = "standby",
 	[PM_SUSPEND_MEM] = "mem",
 };
 const char *pm_states[PM_SUSPEND_MAX];
 static const char * const mem_sleep_labels[] = {
-	[PM_SUSPEND_FREEZE] = "s2idle",
+	[PM_SUSPEND_TO_IDLE] = "s2idle",
 	[PM_SUSPEND_STANDBY] = "shallow",
 	[PM_SUSPEND_MEM] = "deep",
 };
 const char *mem_sleep_states[PM_SUSPEND_MAX];
 
-suspend_state_t mem_sleep_current = PM_SUSPEND_FREEZE;
-static suspend_state_t mem_sleep_default = PM_SUSPEND_MEM;
+suspend_state_t mem_sleep_current = PM_SUSPEND_TO_IDLE;
+suspend_state_t mem_sleep_default = PM_SUSPEND_MAX;
+suspend_state_t pm_suspend_target_state;
+EXPORT_SYMBOL_GPL(pm_suspend_target_state);
 
 unsigned int pm_suspend_global_flags;
 EXPORT_SYMBOL_GPL(pm_suspend_global_flags);
 
 static const struct platform_suspend_ops *suspend_ops;
-static const struct platform_freeze_ops *freeze_ops;
-static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
+static const struct platform_s2idle_ops *s2idle_ops;
+static DECLARE_WAIT_QUEUE_HEAD(s2idle_wait_head);
 
-enum freeze_state __read_mostly suspend_freeze_state;
-static DEFINE_SPINLOCK(suspend_freeze_lock);
+enum s2idle_states __read_mostly s2idle_state;
+static DEFINE_SPINLOCK(s2idle_lock);
 
-void freeze_set_ops(const struct platform_freeze_ops *ops)
+void s2idle_set_ops(const struct platform_s2idle_ops *ops)
 {
 	lock_system_sleep();
-	freeze_ops = ops;
+	s2idle_ops = ops;
 	unlock_system_sleep();
 }
 
-static void freeze_begin(void)
+static void s2idle_begin(void)
 {
-	suspend_freeze_state = FREEZE_STATE_NONE;
+	s2idle_state = S2IDLE_STATE_NONE;
 }
 
-static void freeze_enter(void)
+static void s2idle_enter(void)
 {
-	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_FREEZE, true);
+	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, true);
 
-	spin_lock_irq(&suspend_freeze_lock);
+	spin_lock_irq(&s2idle_lock);
 	if (pm_wakeup_pending())
 		goto out;
 
-	suspend_freeze_state = FREEZE_STATE_ENTER;
-	spin_unlock_irq(&suspend_freeze_lock);
+	s2idle_state = S2IDLE_STATE_ENTER;
+	spin_unlock_irq(&s2idle_lock);
 
 	get_online_cpus();
 	cpuidle_resume();
@@ -87,56 +91,75 @@ static void freeze_enter(void)
 	/* Push all the CPUs into the idle loop. */
 	wake_up_all_idle_cpus();
 	/* Make the current CPU wait so it can enter the idle loop too. */
-	wait_event(suspend_freeze_wait_head,
-		   suspend_freeze_state == FREEZE_STATE_WAKE);
+	wait_event(s2idle_wait_head,
+		   s2idle_state == S2IDLE_STATE_WAKE);
 
 	cpuidle_pause();
 	put_online_cpus();
 
-	spin_lock_irq(&suspend_freeze_lock);
+	spin_lock_irq(&s2idle_lock);
 
  out:
-	suspend_freeze_state = FREEZE_STATE_NONE;
-	spin_unlock_irq(&suspend_freeze_lock);
+	s2idle_state = S2IDLE_STATE_NONE;
+	spin_unlock_irq(&s2idle_lock);
 
-	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_FREEZE, false);
+	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, false);
 }
 
 static void s2idle_loop(void)
 {
-	pr_debug("PM: suspend-to-idle\n");
+	pm_pr_dbg("suspend-to-idle\n");
 
-	do {
-		freeze_enter();
+	for (;;) {
+		int error;
 
-		if (freeze_ops && freeze_ops->wake)
-			freeze_ops->wake();
+		dpm_noirq_begin();
 
-		dpm_resume_noirq(PMSG_RESUME);
-		if (freeze_ops && freeze_ops->sync)
-			freeze_ops->sync();
+		/*
+		 * Suspend-to-idle equals
+		 * frozen processes + suspended devices + idle processors.
+		 * Thus s2idle_enter() should be called right after
+		 * all devices have been suspended.
+		 */
+		error = dpm_noirq_suspend_devices(PMSG_SUSPEND);
+		if (!error)
+			s2idle_enter();
+
+		dpm_noirq_resume_devices(PMSG_RESUME);
+		if (error && (error != -EBUSY || !pm_wakeup_pending())) {
+			dpm_noirq_end();
+			break;
+		}
+
+		if (s2idle_ops && s2idle_ops->wake)
+			s2idle_ops->wake();
+
+		dpm_noirq_end();
+
+		if (s2idle_ops && s2idle_ops->sync)
+			s2idle_ops->sync();
 
 		if (pm_wakeup_pending())
 			break;
 
 		pm_wakeup_clear(false);
-	} while (!dpm_suspend_noirq(PMSG_SUSPEND));
+	}
 
-	pr_debug("PM: resume from suspend-to-idle\n");
+	pm_pr_dbg("resume from suspend-to-idle\n");
 }
 
-void freeze_wake(void)
+void s2idle_wake(void)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&suspend_freeze_lock, flags);
-	if (suspend_freeze_state > FREEZE_STATE_NONE) {
-		suspend_freeze_state = FREEZE_STATE_WAKE;
-		wake_up(&suspend_freeze_wait_head);
+	spin_lock_irqsave(&s2idle_lock, flags);
+	if (s2idle_state > S2IDLE_STATE_NONE) {
+		s2idle_state = S2IDLE_STATE_WAKE;
+		wake_up(&s2idle_wait_head);
 	}
-	spin_unlock_irqrestore(&suspend_freeze_lock, flags);
+	spin_unlock_irqrestore(&s2idle_lock, flags);
 }
-EXPORT_SYMBOL_GPL(freeze_wake);
+EXPORT_SYMBOL_GPL(s2idle_wake);
 
 static bool valid_state(suspend_state_t state)
 {
@@ -152,19 +175,19 @@ void __init pm_states_init(void)
 {
 	/* "mem" and "freeze" are always present in /sys/power/state. */
 	pm_states[PM_SUSPEND_MEM] = pm_labels[PM_SUSPEND_MEM];
-	pm_states[PM_SUSPEND_FREEZE] = pm_labels[PM_SUSPEND_FREEZE];
+	pm_states[PM_SUSPEND_TO_IDLE] = pm_labels[PM_SUSPEND_TO_IDLE];
 	/*
 	 * Suspend-to-idle should be supported even without any suspend_ops,
 	 * initialize mem_sleep_states[] accordingly here.
 	 */
-	mem_sleep_states[PM_SUSPEND_FREEZE] = mem_sleep_labels[PM_SUSPEND_FREEZE];
+	mem_sleep_states[PM_SUSPEND_TO_IDLE] = mem_sleep_labels[PM_SUSPEND_TO_IDLE];
 }
 
 static int __init mem_sleep_default_setup(char *str)
 {
 	suspend_state_t state;
 
-	for (state = PM_SUSPEND_FREEZE; state <= PM_SUSPEND_MEM; state++)
+	for (state = PM_SUSPEND_TO_IDLE; state <= PM_SUSPEND_MEM; state++)
 		if (mem_sleep_labels[state] &&
 		    !strcmp(str, mem_sleep_labels[state])) {
 			mem_sleep_default = state;
@@ -193,7 +216,7 @@ void suspend_set_ops(const struct platform_suspend_ops *ops)
 	}
 	if (valid_state(PM_SUSPEND_MEM)) {
 		mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM];
-		if (mem_sleep_default == PM_SUSPEND_MEM)
+		if (mem_sleep_default >= PM_SUSPEND_MEM)
 			mem_sleep_current = PM_SUSPEND_MEM;
 	}
 
@@ -216,49 +239,49 @@ EXPORT_SYMBOL_GPL(suspend_valid_only_mem);
 
 static bool sleep_state_supported(suspend_state_t state)
 {
-	return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter);
+	return state == PM_SUSPEND_TO_IDLE || (suspend_ops && suspend_ops->enter);
 }
 
 static int platform_suspend_prepare(suspend_state_t state)
 {
-	return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ?
+	return state != PM_SUSPEND_TO_IDLE && suspend_ops->prepare ?
 		suspend_ops->prepare() : 0;
 }
 
 static int platform_suspend_prepare_late(suspend_state_t state)
 {
-	return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ?
-		freeze_ops->prepare() : 0;
+	return state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->prepare ?
+		s2idle_ops->prepare() : 0;
 }
 
 static int platform_suspend_prepare_noirq(suspend_state_t state)
 {
-	return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ?
+	return state != PM_SUSPEND_TO_IDLE && suspend_ops->prepare_late ?
 		suspend_ops->prepare_late() : 0;
 }
 
 static void platform_resume_noirq(suspend_state_t state)
 {
-	if (state != PM_SUSPEND_FREEZE && suspend_ops->wake)
+	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->wake)
 		suspend_ops->wake();
 }
 
 static void platform_resume_early(suspend_state_t state)
 {
-	if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore)
-		freeze_ops->restore();
+	if (state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->restore)
+		s2idle_ops->restore();
 }
 
 static void platform_resume_finish(suspend_state_t state)
 {
-	if (state != PM_SUSPEND_FREEZE && suspend_ops->finish)
+	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->finish)
 		suspend_ops->finish();
 }
 
 static int platform_suspend_begin(suspend_state_t state)
 {
-	if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin)
-		return freeze_ops->begin();
+	if (state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->begin)
+		return s2idle_ops->begin();
 	else if (suspend_ops && suspend_ops->begin)
 		return suspend_ops->begin(state);
 	else
@@ -267,21 +290,21 @@ static int platform_suspend_begin(suspend_state_t state)
 
 static void platform_resume_end(suspend_state_t state)
 {
-	if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end)
-		freeze_ops->end();
+	if (state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->end)
+		s2idle_ops->end();
 	else if (suspend_ops && suspend_ops->end)
 		suspend_ops->end();
 }
 
 static void platform_recover(suspend_state_t state)
 {
-	if (state != PM_SUSPEND_FREEZE && suspend_ops->recover)
+	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->recover)
 		suspend_ops->recover();
 }
 
 static bool platform_suspend_again(suspend_state_t state)
 {
-	return state != PM_SUSPEND_FREEZE && suspend_ops->suspend_again ?
+	return state != PM_SUSPEND_TO_IDLE && suspend_ops->suspend_again ?
 		suspend_ops->suspend_again() : false;
 }
 
@@ -370,16 +393,21 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 
 	error = dpm_suspend_late(PMSG_SUSPEND);
 	if (error) {
-		pr_err("PM: late suspend of devices failed\n");
+		pr_err("late suspend of devices failed\n");
 		goto Platform_finish;
 	}
 	error = platform_suspend_prepare_late(state);
 	if (error)
 		goto Devices_early_resume;
 
+	if (state == PM_SUSPEND_TO_IDLE && pm_test_level != TEST_PLATFORM) {
+		s2idle_loop();
+		goto Platform_early_resume;
+	}
+
 	error = dpm_suspend_noirq(PMSG_SUSPEND);
 	if (error) {
-		pr_err("PM: noirq suspend of devices failed\n");
+		pr_err("noirq suspend of devices failed\n");
 		goto Platform_early_resume;
 	}
 	error = platform_suspend_prepare_noirq(state);
@@ -389,17 +417,6 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 	if (suspend_test(TEST_PLATFORM))
 		goto Platform_wake;
 
-	/*
-	 * PM_SUSPEND_FREEZE equals
-	 * frozen processes + suspended devices + idle processors.
-	 * Thus we should invoke freeze_enter() soon after
-	 * all the devices are suspended.
-	 */
-	if (state == PM_SUSPEND_FREEZE) {
-		s2idle_loop();
-		goto Platform_early_resume;
-	}
-
 	error = disable_nonboot_cpus();
 	if (error || suspend_test(TEST_CPUS))
 		goto Enable_cpus;
@@ -456,6 +473,8 @@ int suspend_devices_and_enter(suspend_state_t state)
 	if (!sleep_state_supported(state))
 		return -ENOSYS;
 
+	pm_suspend_target_state = state;
+
 	error = platform_suspend_begin(state);
 	if (error)
 		goto Close;
@@ -464,7 +483,7 @@ int suspend_devices_and_enter(suspend_state_t state)
 	suspend_test_start();
 	error = dpm_suspend_start(PMSG_SUSPEND);
 	if (error) {
-		pr_err("PM: Some devices failed to suspend, or early wake event detected\n");
+		pr_err("Some devices failed to suspend, or early wake event detected\n");
 		goto Recover_platform;
 	}
 	suspend_test_finish("suspend devices");
@@ -485,6 +504,7 @@ int suspend_devices_and_enter(suspend_state_t state)
 
  Close:
 	platform_resume_end(state);
+	pm_suspend_target_state = PM_SUSPEND_ON;
 	return error;
 
  Recover_platform:
@@ -518,10 +538,10 @@ static int enter_state(suspend_state_t state)
 	int error;
 
 	trace_suspend_resume(TPS("suspend_enter"), state, true);
-	if (state == PM_SUSPEND_FREEZE) {
+	if (state == PM_SUSPEND_TO_IDLE) {
 #ifdef CONFIG_PM_DEBUG
 		if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
-			pr_warn("PM: Unsupported test mode for suspend to idle, please choose none/freezer/devices/platform.\n");
+			pr_warn("Unsupported test mode for suspend to idle, please choose none/freezer/devices/platform.\n");
 			return -EAGAIN;
 		}
 #endif
@@ -531,18 +551,18 @@ static int enter_state(suspend_state_t state)
 	if (!mutex_trylock(&pm_mutex))
 		return -EBUSY;
 
-	if (state == PM_SUSPEND_FREEZE)
-		freeze_begin();
+	if (state == PM_SUSPEND_TO_IDLE)
+		s2idle_begin();
 
 #ifndef CONFIG_SUSPEND_SKIP_SYNC
 	trace_suspend_resume(TPS("sync_filesystems"), 0, true);
-	pr_info("PM: Syncing filesystems ... ");
+	pr_info("Syncing filesystems ... ");
 	sys_sync();
 	pr_cont("done.\n");
 	trace_suspend_resume(TPS("sync_filesystems"), 0, false);
 #endif
 
-	pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]);
+	pm_pr_dbg("Preparing system for sleep (%s)\n", mem_sleep_labels[state]);
 	pm_suspend_clear_flags();
 	error = suspend_prepare(state);
 	if (error)
@@ -552,13 +572,13 @@ static int enter_state(suspend_state_t state)
 		goto Finish;
 
 	trace_suspend_resume(TPS("suspend_enter"), state, false);
-	pr_debug("PM: Suspending system (%s)\n", pm_states[state]);
+	pm_pr_dbg("Suspending system (%s)\n", mem_sleep_labels[state]);
 	pm_restrict_gfp_mask();
 	error = suspend_devices_and_enter(state);
 	pm_restore_gfp_mask();
 
  Finish:
-	pr_debug("PM: Finishing wakeup.\n");
+	pm_pr_dbg("Finishing wakeup.\n");
 	suspend_finish();
  Unlock:
 	mutex_unlock(&pm_mutex);
@@ -579,6 +599,7 @@ int pm_suspend(suspend_state_t state)
 	if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
 		return -EINVAL;
 
+	pr_info("suspend entry (%s)\n", mem_sleep_labels[state]);
 	error = enter_state(state);
 	if (error) {
 		suspend_stats.fail++;
@@ -586,6 +607,7 @@ int pm_suspend(suspend_state_t state)
 	} else {
 		suspend_stats.success++;
 	}
+	pr_info("suspend exit\n");
 	return error;
 }
 EXPORT_SYMBOL(pm_suspend);

kernel/power/suspend_test.c

@@ -104,9 +104,9 @@ static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state)
 		printk(info_test, pm_states[state]);
 		status = pm_suspend(state);
 		if (status < 0)
-			state = PM_SUSPEND_FREEZE;
+			state = PM_SUSPEND_TO_IDLE;
 	}
-	if (state == PM_SUSPEND_FREEZE) {
+	if (state == PM_SUSPEND_TO_IDLE) {
 		printk(info_test, pm_states[state]);
 		status = pm_suspend(state);
 	}

kernel/sched/idle.c

@@ -158,7 +158,7 @@ static void cpuidle_idle_call(void)
 	}
 
 	/*
-	 * Suspend-to-idle ("freeze") is a system state in which all user space
+	 * Suspend-to-idle ("s2idle") is a system state in which all user space
 	 * has been frozen, all I/O devices have been suspended and the only
 	 * activity happens here and in iterrupts (if any).  In that case bypass
 	 * the cpuidle governor and go stratight for the deepest idle state
@@ -167,9 +167,9 @@ static void cpuidle_idle_call(void)
 	 * until a proper wakeup interrupt happens.
 	 */
 
-	if (idle_should_freeze() || dev->use_deepest_state) {
-		if (idle_should_freeze()) {
-			entered_state = cpuidle_enter_freeze(drv, dev);
+	if (idle_should_enter_s2idle() || dev->use_deepest_state) {
+		if (idle_should_enter_s2idle()) {
+			entered_state = cpuidle_enter_s2idle(drv, dev);
 			if (entered_state > 0) {
 				local_irq_enable();
 				goto exit_idle;

kernel/time/timekeeping_debug.c

@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/seq_file.h>
+#include <linux/suspend.h>
 #include <linux/time.h>
 
 #include "timekeeping_internal.h"
@@ -75,7 +76,7 @@ void tk_debug_account_sleep_time(struct timespec64 *t)
 	int bin = min(fls(t->tv_sec), NUM_BINS-1);
 
 	sleep_time_bin[bin]++;
-	printk_deferred(KERN_INFO "Suspended for %lld.%03lu seconds\n",
+	pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
 			   (s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
 }