Merge branches 'acpi-pm', 'acpi-processor' and 'acpi-resources'

* acpi-pm:
  ACPI: PM: postpone bringing devices to D0 unless we need them
  ACPI: PM: Adjust behavior for field problems on AMD systems
  ACPI: PM: s2idle: Add support for new Microsoft UUID
  ACPI: PM: s2idle: Add support for multiple func mask
  ACPI: PM: s2idle: Refactor common code
  ACPI: PM: s2idle: Use correct revision id
  ACPI: power: Use dev_dbg() to print some messages
  ACPI: sleep: Fix acpi_pm_pre_suspend() kernel-doc
  ACPI: power: Rework turning off unused power resources
  ACPI: power: Save the last known state of each power resource
  ACPI: power: Use u8 as the power resource state data type
  ACPI: PM / fan: Put fan device IDs into separate header file
  ACPI: PM: s2idle: Add missing LPS0 functions for AMD

* acpi-processor:
  ACPI: processor_throttling: Fix several coding style issues
  ACPI: processor_throttling: Remove redundant initialization of 'obj'
  ACPI: processor idle: Fix up C-state latency if not ordered

* acpi-resources:
  ACPI: resources: Add checks for ACPI IRQ override

Author: rafaeljw

drivers/acpi/device_pm.c

@@ -20,6 +20,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
 
+#include "fan.h"
 #include "internal.h"
 
 /**
@@ -1133,19 +1134,48 @@ static int acpi_subsys_resume_noirq(struct device *dev)
  *
  * Use ACPI to put the given device into the full-power state and carry out the
  * generic early resume procedure for it during system transition into the
- * working state.
+ * working state, but only do that if device either defines early resume
+ * handler, or does not define power operations at all. Otherwise powering up
+ * of the device is postponed to the normal resume phase.
  */
 static int acpi_subsys_resume_early(struct device *dev)
 {
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int ret;
 
 	if (dev_pm_skip_resume(dev))
 		return 0;
 
+	if (pm && !pm->resume_early) {
+		dev_dbg(dev, "postponing D0 transition to normal resume stage\n");
+		return 0;
+	}
+
 	ret = acpi_dev_resume(dev);
 	return ret ? ret : pm_generic_resume_early(dev);
 }
 
+/**
+ * acpi_subsys_resume - Resume device using ACPI.
+ * @dev: Device to Resume.
+ *
+ * Use ACPI to put the given device into the full-power state if it has not been
+ * powered up during early resume phase, and carry out the generic resume
+ * procedure for it during system transition into the working state.
+ */
+static int acpi_subsys_resume(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+	int ret = 0;
+
+	if (!dev_pm_skip_resume(dev) && pm && !pm->resume_early) {
+		dev_dbg(dev, "executing postponed D0 transition\n");
+		ret = acpi_dev_resume(dev);
+	}
+
+	return ret ? ret : pm_generic_resume(dev);
+}
+
 /**
  * acpi_subsys_freeze - Run the device driver's freeze callback.
  * @dev: Device to handle.
@@ -1239,6 +1269,7 @@ static struct dev_pm_domain acpi_general_pm_domain = {
 		.prepare = acpi_subsys_prepare,
 		.complete = acpi_subsys_complete,
 		.suspend = acpi_subsys_suspend,
+		.resume = acpi_subsys_resume,
 		.suspend_late = acpi_subsys_suspend_late,
 		.suspend_noirq = acpi_subsys_suspend_noirq,
 		.resume_noirq = acpi_subsys_resume_noirq,
@@ -1310,10 +1341,7 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on)
 	 * with the generic ACPI PM domain.
 	 */
 	static const struct acpi_device_id special_pm_ids[] = {
-		{"PNP0C0B", }, /* Generic ACPI fan */
-		{"INT3404", }, /* Fan */
-		{"INTC1044", }, /* Fan for Tiger Lake generation */
-		{"INTC1048", }, /* Fan for Alder Lake generation */
+		ACPI_FAN_DEVICE_IDS,
 		{}
 	};
 	struct acpi_device *adev = ACPI_COMPANION(dev);

drivers/acpi/fan.c

@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/sort.h>
 
+#include "fan.h"
+
 MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI Fan Driver");
 MODULE_LICENSE("GPL");
@@ -24,10 +26,7 @@ static int acpi_fan_probe(struct platform_device *pdev);
 static int acpi_fan_remove(struct platform_device *pdev);
 
 static const struct acpi_device_id fan_device_ids[] = {
-	{"PNP0C0B", 0},
-	{"INT3404", 0},
-	{"INTC1044", 0},
-	{"INTC1048", 0},
+	ACPI_FAN_DEVICE_IDS,
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, fan_device_ids);

drivers/acpi/fan.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * ACPI fan device IDs are shared between the fan driver and the device power
+ * management code.
+ *
+ * Add new device IDs before the generic ACPI fan one.
+ */
+#define ACPI_FAN_DEVICE_IDS	\
+	{"INT3404", }, /* Fan */ \
+	{"INTC1044", }, /* Fan for Tiger Lake generation */ \
+	{"INTC1048", }, /* Fan for Alder Lake generation */ \
+	{"PNP0C0B", } /* Generic ACPI fan */

drivers/acpi/internal.h

@@ -142,7 +142,7 @@ int acpi_device_sleep_wake(struct acpi_device *dev,
 int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
 int acpi_power_on_resources(struct acpi_device *device, int state);
 int acpi_power_transition(struct acpi_device *device, int state);
-void acpi_turn_off_unused_power_resources(bool init);
+void acpi_turn_off_unused_power_resources(void);
 
 /* --------------------------------------------------------------------------
                               Device Power Management

drivers/acpi/power.c

@@ -52,7 +52,7 @@ struct acpi_power_resource {
 	u32 system_level;
 	u32 order;
 	unsigned int ref_count;
-	unsigned int users;
+	u8 state;
 	bool wakeup_enabled;
 	struct mutex resource_lock;
 	struct list_head dependents;
@@ -173,53 +173,61 @@ int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
 		err = acpi_power_resources_list_add(rhandle, list);
 		if (err)
 			break;
-
-		to_power_resource(rdev)->users++;
 	}
 	if (err)
 		acpi_power_resources_list_free(list);
 
 	return err;
 }
 
-static int acpi_power_get_state(acpi_handle handle, int *state)
+static int __get_state(acpi_handle handle, u8 *state)
 {
 	acpi_status status = AE_OK;
 	unsigned long long sta = 0;
-
-	if (!handle || !state)
-		return -EINVAL;
+	u8 cur_state;
 
 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
 
-	*state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
-			      ACPI_POWER_RESOURCE_STATE_OFF;
+	cur_state = sta & ACPI_POWER_RESOURCE_STATE_ON;
 
 	acpi_handle_debug(handle, "Power resource is %s\n",
-			  *state ? "on" : "off");
+			  cur_state ? "on" : "off");
+
+	*state = cur_state;
+	return 0;
+}
+
+static int acpi_power_get_state(struct acpi_power_resource *resource, u8 *state)
+{
+	if (resource->state == ACPI_POWER_RESOURCE_STATE_UNKNOWN) {
+		int ret;
 
+		ret = __get_state(resource->device.handle, &resource->state);
+		if (ret)
+			return ret;
+	}
+
+	*state = resource->state;
 	return 0;
 }
 
-static int acpi_power_get_list_state(struct list_head *list, int *state)
+static int acpi_power_get_list_state(struct list_head *list, u8 *state)
 {
 	struct acpi_power_resource_entry *entry;
-	int cur_state;
+	u8 cur_state = ACPI_POWER_RESOURCE_STATE_OFF;
 
 	if (!list || !state)
 		return -EINVAL;
 
 	/* The state of the list is 'on' IFF all resources are 'on'. */
-	cur_state = 0;
 	list_for_each_entry(entry, list, node) {
 		struct acpi_power_resource *resource = entry->resource;
-		acpi_handle handle = resource->device.handle;
 		int result;
 
 		mutex_lock(&resource->resource_lock);
-		result = acpi_power_get_state(handle, &cur_state);
+		result = acpi_power_get_state(resource, &cur_state);
 		mutex_unlock(&resource->resource_lock);
 		if (result)
 			return result;
@@ -352,8 +360,12 @@ static int __acpi_power_on(struct acpi_power_resource *resource)
 	acpi_status status = AE_OK;
 
 	status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
-	if (ACPI_FAILURE(status))
+	if (ACPI_FAILURE(status)) {
+		resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
 		return -ENODEV;
+	}
+
+	resource->state = ACPI_POWER_RESOURCE_STATE_ON;
 
 	pr_debug("Power resource [%s] turned on\n", resource->name);
 
@@ -405,8 +417,12 @@ static int __acpi_power_off(struct acpi_power_resource *resource)
 
 	status = acpi_evaluate_object(resource->device.handle, "_OFF",
 				      NULL, NULL);
-	if (ACPI_FAILURE(status))
+	if (ACPI_FAILURE(status)) {
+		resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
 		return -ENODEV;
+	}
+
+	resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
 
 	pr_debug("Power resource [%s] turned off\n", resource->name);
 
@@ -590,13 +606,12 @@ int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
 
 	list_for_each_entry(entry, list, node) {
 		struct acpi_power_resource *resource = entry->resource;
-		acpi_handle handle = resource->device.handle;
 		int result;
-		int state;
+		u8 state;
 
 		mutex_lock(&resource->resource_lock);
 
-		result = acpi_power_get_state(handle, &state);
+		result = acpi_power_get_state(resource, &state);
 		if (result) {
 			mutex_unlock(&resource->resource_lock);
 			return result;
@@ -789,8 +804,8 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
 
 int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
 {
+	u8 list_state = ACPI_POWER_RESOURCE_STATE_OFF;
 	int result = 0;
-	int list_state = 0;
 	int i = 0;
 
 	if (!device || !state)
@@ -919,7 +934,7 @@ struct acpi_device *acpi_add_power_resource(acpi_handle handle)
 	union acpi_object acpi_object;
 	struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
 	acpi_status status;
-	int state, result = -ENODEV;
+	int result;
 
 	acpi_bus_get_device(handle, &device);
 	if (device)
@@ -946,13 +961,9 @@ struct acpi_device *acpi_add_power_resource(acpi_handle handle)
 
 	resource->system_level = acpi_object.power_resource.system_level;
 	resource->order = acpi_object.power_resource.resource_order;
+	resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
 
-	result = acpi_power_get_state(handle, &state);
-	if (result)
-		goto err;
-
-	pr_info("%s [%s] (%s)\n", acpi_device_name(device),
-		acpi_device_bid(device), state ? "on" : "off");
+	pr_info("%s [%s]\n", acpi_device_name(device), acpi_device_bid(device));
 
 	device->flags.match_driver = true;
 	result = acpi_device_add(device, acpi_release_power_resource);
@@ -979,19 +990,21 @@ void acpi_resume_power_resources(void)
 	mutex_lock(&power_resource_list_lock);
 
 	list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
-		int result, state;
+		int result;
+		u8 state;
 
 		mutex_lock(&resource->resource_lock);
 
-		result = acpi_power_get_state(resource->device.handle, &state);
+		resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
+		result = acpi_power_get_state(resource, &state);
 		if (result) {
 			mutex_unlock(&resource->resource_lock);
 			continue;
 		}
 
 		if (state == ACPI_POWER_RESOURCE_STATE_OFF
 		    && resource->ref_count) {
-			dev_info(&resource->device.dev, "Turning ON\n");
+			dev_dbg(&resource->device.dev, "Turning ON\n");
 			__acpi_power_on(resource);
 		}
 
@@ -1002,38 +1015,10 @@ void acpi_resume_power_resources(void)
 }
 #endif
 
-static void acpi_power_turn_off_if_unused(struct acpi_power_resource *resource,
-				       bool init)
-{
-	if (resource->ref_count > 0)
-		return;
-
-	if (init) {
-		if (resource->users > 0)
-			return;
-	} else {
-		int result, state;
-
-		result = acpi_power_get_state(resource->device.handle, &state);
-		if (result || state == ACPI_POWER_RESOURCE_STATE_OFF)
-			return;
-	}
-
-	dev_info(&resource->device.dev, "Turning OFF\n");
-	__acpi_power_off(resource);
-}
-
 /**
  * acpi_turn_off_unused_power_resources - Turn off power resources not in use.
- * @init: Control switch.
- *
- * If @ainit is set, unconditionally turn off all of the ACPI power resources
- * without any users.
- *
- * Otherwise, turn off all ACPI power resources without active references (that
- * is, the ones that should be "off" at the moment) that are "on".
  */
-void acpi_turn_off_unused_power_resources(bool init)
+void acpi_turn_off_unused_power_resources(void)
 {
 	struct acpi_power_resource *resource;
 
@@ -1042,7 +1027,16 @@ void acpi_turn_off_unused_power_resources(bool init)
 	list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
 		mutex_lock(&resource->resource_lock);
 
-		acpi_power_turn_off_if_unused(resource, init);
+		/*
+		 * Turn off power resources in an unknown state too, because the
+		 * platform firmware on some system expects the OS to turn off
+		 * power resources without any users unconditionally.
+		 */
+		if (!resource->ref_count &&
+		    resource->state != ACPI_POWER_RESOURCE_STATE_OFF) {
+			dev_dbg(&resource->device.dev, "Turning OFF\n");
+			__acpi_power_off(resource);
+		}
 
 		mutex_unlock(&resource->resource_lock);
 	}