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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/drivers/acpi/device_pm.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * drivers/acpi/device_pm.c - ACPI device power management routines.
34  *
....@@ -5,15 +6,6 @@
56  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
67  *
78  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8
- *
9
- *  This program is free software; you can redistribute it and/or modify
10
- *  it under the terms of the GNU General Public License version 2 as published
11
- *  by the Free Software Foundation.
12
- *
13
- *  This program is distributed in the hope that it will be useful, but
14
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
15
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
- *  General Public License for more details.
179  *
1810  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1911  */
....@@ -26,6 +18,7 @@
2618 #include <linux/pm_runtime.h>
2719 #include <linux/suspend.h>
2820 
21
+#include "fan.h"
2922 #include "internal.h"
3023 
3124 #define _COMPONENT	ACPI_POWER_COMPONENT
....@@ -53,6 +46,19 @@
5346 	}
5447 }
5548 
49
+static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state)
50
+{
51
+	unsigned long long psc;
52
+	acpi_status status;
53
+
54
+	status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc);
55
+	if (ACPI_FAILURE(status))
56
+		return -ENODEV;
57
+
58
+	*state = psc;
59
+	return 0;
60
+}
61
+
5662 /**
5763  * acpi_device_get_power - Get power state of an ACPI device.
5864  * @device: Device to get the power state of.
....@@ -61,10 +67,16 @@
6167  * This function does not update the device's power.state field, but it may
6268  * update its parent's power.state field (when the parent's power state is
6369  * unknown and the device's power state turns out to be D0).
70
+ *
71
+ * Also, it does not update power resource reference counters to ensure that
72
+ * the power state returned by it will be persistent and it may return a power
73
+ * state shallower than previously set by acpi_device_set_power() for @device
74
+ * (if that power state depends on any power resources).
6475  */
6576 int acpi_device_get_power(struct acpi_device *device, int *state)
6677 {
6778 	int result = ACPI_STATE_UNKNOWN;
79
+	int error;
6880 
6981 	if (!device || !state)
7082 		return -EINVAL;
....@@ -81,18 +93,16 @@
8193 	 * if available.
8294 	 */
8395 	if (device->power.flags.power_resources) {
84
-		int error = acpi_power_get_inferred_state(device, &result);
96
+		error = acpi_power_get_inferred_state(device, &result);
8597 		if (error)
8698 			return error;
8799 	}
88100 	if (device->power.flags.explicit_get) {
89
-		acpi_handle handle = device->handle;
90
-		unsigned long long psc;
91
-		acpi_status status;
101
+		int psc;
92102 
93
-		status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc);
94
-		if (ACPI_FAILURE(status))
95
-			return -ENODEV;
103
+		error = acpi_dev_pm_explicit_get(device, &psc);
104
+		if (error)
105
+			return error;
96106 
97107 		/*
98108 		 * The power resources settings may indicate a power state
....@@ -157,9 +167,14 @@
157167 	    || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
158168 		return -EINVAL;
159169 
170
+	acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
171
+			  acpi_power_state_string(device->power.state),
172
+			  acpi_power_state_string(state));
173
+
160174 	/* Make sure this is a valid target state */
161175 
162
-	if (state == device->power.state) {
176
+	/* There is a special case for D0 addressed below. */
177
+	if (state > ACPI_STATE_D0 && state == device->power.state) {
163178 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n",
164179 				  device->pnp.bus_id,
165180 				  acpi_power_state_string(state)));
....@@ -209,18 +224,50 @@
209224 			return -ENODEV;
210225 		}
211226 
212
-		result = acpi_dev_pm_explicit_set(device, state);
213
-		if (result)
214
-			goto end;
227
+		/*
228
+		 * If the device goes from D3hot to D3cold, _PS3 has been
229
+		 * evaluated for it already, so skip it in that case.
230
+		 */
231
+		if (device->power.state < ACPI_STATE_D3_HOT) {
232
+			result = acpi_dev_pm_explicit_set(device, state);
233
+			if (result)
234
+				goto end;
235
+		}
215236 
216237 		if (device->power.flags.power_resources)
217238 			result = acpi_power_transition(device, target_state);
218239 	} else {
240
+		int cur_state = device->power.state;
241
+
219242 		if (device->power.flags.power_resources) {
220243 			result = acpi_power_transition(device, ACPI_STATE_D0);
221244 			if (result)
222245 				goto end;
223246 		}
247
+
248
+		if (cur_state == ACPI_STATE_D0) {
249
+			int psc;
250
+
251
+			/* Nothing to do here if _PSC is not present. */
252
+			if (!device->power.flags.explicit_get)
253
+				return 0;
254
+
255
+			/*
256
+			 * The power state of the device was set to D0 last
257
+			 * time, but that might have happened before a
258
+			 * system-wide transition involving the platform
259
+			 * firmware, so it may be necessary to evaluate _PS0
260
+			 * for the device here.  However, use extra care here
261
+			 * and evaluate _PSC to check the device's current power
262
+			 * state, and only invoke _PS0 if the evaluation of _PSC
263
+			 * is successful and it returns a power state different
264
+			 * from D0.
265
+			 */
266
+			result = acpi_dev_pm_explicit_get(device, &psc);
267
+			if (result || psc == ACPI_STATE_D0)
268
+				return 0;
269
+		}
270
+
224271 		result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
225272 	}
226273 
....@@ -413,7 +460,7 @@
413460 	if (adev->wakeup.flags.notifier_present) {
414461 		pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup());
415462 		if (adev->wakeup.context.func) {
416
-			acpi_handle_debug(handle, "Running %pF for %s\n",
463
+			acpi_handle_debug(handle, "Running %pS for %s\n",
417464 					  adev->wakeup.context.func,
418465 					  dev_name(adev->wakeup.context.dev));
419466 			adev->wakeup.context.func(&adev->wakeup.context);
....@@ -729,6 +776,9 @@
729776 		goto out;
730777 	}
731778 
779
+	acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n",
780
+			  (unsigned int)wakeup->gpe_number);
781
+
732782 inc:
733783 	wakeup->enable_count++;
734784 
....@@ -1018,7 +1068,7 @@
10181068 {
10191069 	int ret;
10201070 
1021
-	if (dev_pm_smart_suspend_and_suspended(dev))
1071
+	if (dev_pm_skip_suspend(dev))
10221072 		return 0;
10231073 
10241074 	ret = pm_generic_suspend_late(dev);
....@@ -1034,10 +1084,8 @@
10341084 {
10351085 	int ret;
10361086 
1037
-	if (dev_pm_smart_suspend_and_suspended(dev)) {
1038
-		dev->power.may_skip_resume = true;
1087
+	if (dev_pm_skip_suspend(dev))
10391088 		return 0;
1040
-	}
10411089 
10421090 	ret = pm_generic_suspend_noirq(dev);
10431091 	if (ret)
....@@ -1050,8 +1098,8 @@
10501098 	 * acpi_subsys_complete() to take care of fixing up the device's state
10511099 	 * anyway, if need be.
10521100 	 */
1053
-	dev->power.may_skip_resume = device_may_wakeup(dev) ||
1054
-					!device_can_wakeup(dev);
1101
+	if (device_can_wakeup(dev) && !device_may_wakeup(dev))
1102
+		dev->power.may_skip_resume = false;
10551103 
10561104 	return 0;
10571105 }
....@@ -1063,16 +1111,8 @@
10631111  */
10641112 static int acpi_subsys_resume_noirq(struct device *dev)
10651113 {
1066
-	if (dev_pm_may_skip_resume(dev))
1114
+	if (dev_pm_skip_resume(dev))
10671115 		return 0;
1068
-
1069
-	/*
1070
-	 * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
1071
-	 * during system suspend, so update their runtime PM status to "active"
1072
-	 * as they will be put into D0 going forward.
1073
-	 */
1074
-	if (dev_pm_smart_suspend_and_suspended(dev))
1075
-		pm_runtime_set_active(dev);
10761116 
10771117 	return pm_generic_resume_noirq(dev);
10781118 }
....@@ -1087,7 +1127,12 @@
10871127  */
10881128 static int acpi_subsys_resume_early(struct device *dev)
10891129 {
1090
-	int ret = acpi_dev_resume(dev);
1130
+	int ret;
1131
+
1132
+	if (dev_pm_skip_resume(dev))
1133
+		return 0;
1134
+
1135
+	ret = acpi_dev_resume(dev);
10911136 	return ret ? ret : pm_generic_resume_early(dev);
10921137 }
10931138 
....@@ -1152,7 +1197,7 @@
11521197 {
11531198 	int ret;
11541199 
1155
-	if (dev_pm_smart_suspend_and_suspended(dev))
1200
+	if (dev_pm_skip_suspend(dev))
11561201 		return 0;
11571202 
11581203 	ret = pm_generic_poweroff_late(dev);
....@@ -1168,7 +1213,7 @@
11681213  */
11691214 static int acpi_subsys_poweroff_noirq(struct device *dev)
11701215 {
1171
-	if (dev_pm_smart_suspend_and_suspended(dev))
1216
+	if (dev_pm_skip_suspend(dev))
11721217 		return 0;
11731218 
11741219 	return pm_generic_poweroff_noirq(dev);
....@@ -1254,8 +1299,7 @@
12541299 	 * with the generic ACPI PM domain.
12551300 	 */
12561301 	static const struct acpi_device_id special_pm_ids[] = {
1257
-		{"PNP0C0B", }, /* Generic ACPI fan */
1258
-		{"INT3404", }, /* Fan */
1302
+		ACPI_FAN_DEVICE_IDS,
12591303 		{}
12601304 	};
12611305 	struct acpi_device *adev = ACPI_COMPANION(dev);