2 * sleep.c - ACPI sleep support.
4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (c) 2000-2003 Patrick Mochel
7 * Copyright (c) 2003 Open Source Development Lab
9 * This file is released under the GPLv2.
13 #include <linux/delay.h>
14 #include <linux/irq.h>
15 #include <linux/dmi.h>
16 #include <linux/device.h>
17 #include <linux/interrupt.h>
18 #include <linux/suspend.h>
19 #include <linux/reboot.h>
20 #include <linux/acpi.h>
21 #include <linux/module.h>
22 #include <linux/syscore_ops.h>
24 #include <trace/events/power.h>
30 * Some HW-full platforms do not have _S5, so they may need
31 * to leverage efi power off for a shutdown.
34 static u8 sleep_states[ACPI_S_STATE_COUNT];
36 static void acpi_sleep_tts_switch(u32 acpi_state)
40 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
41 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
43 * OS can't evaluate the _TTS object correctly. Some warning
44 * message will be printed. But it won't break anything.
46 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
50 static int tts_notify_reboot(struct notifier_block *this,
51 unsigned long code, void *x)
53 acpi_sleep_tts_switch(ACPI_STATE_S5);
57 static struct notifier_block tts_notifier = {
58 .notifier_call = tts_notify_reboot,
63 static int acpi_sleep_prepare(u32 acpi_state)
65 #ifdef CONFIG_ACPI_SLEEP
66 /* do we have a wakeup address for S2 and S3? */
67 if (acpi_state == ACPI_STATE_S3) {
68 if (!acpi_wakeup_address)
70 acpi_set_waking_vector(acpi_wakeup_address);
73 ACPI_FLUSH_CPU_CACHE();
75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
77 acpi_enable_wakeup_devices(acpi_state);
78 acpi_enter_sleep_state_prep(acpi_state);
82 static bool acpi_sleep_state_supported(u8 sleep_state)
87 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
88 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
89 || (acpi_gbl_FADT.sleep_control.address
90 && acpi_gbl_FADT.sleep_status.address));
93 #ifdef CONFIG_ACPI_SLEEP
94 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
96 u32 acpi_target_system_state(void)
98 return acpi_target_sleep_state;
100 EXPORT_SYMBOL_GPL(acpi_target_system_state);
102 static bool pwr_btn_event_pending;
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. Windows does that also for
107 * suspend to RAM. However, it is known that this mechanism does not work on
108 * all machines, so we allow the user to disable it with the help of the
109 * 'acpi_sleep=nonvs' kernel command line option.
111 static bool nvs_nosave;
113 void __init acpi_nvs_nosave(void)
119 * The ACPI specification wants us to save NVS memory regions during hibernation
120 * but says nothing about saving NVS during S3. Not all versions of Windows
121 * save NVS on S3 suspend either, and it is clear that not all systems need
122 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
123 * user to disable saving NVS on S3 if their system does not require it, but
124 * continue to save/restore NVS for S4 as specified.
126 static bool nvs_nosave_s3;
128 void __init acpi_nvs_nosave_s3(void)
130 nvs_nosave_s3 = true;
133 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
135 nvs_nosave_s3 = false;
140 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
141 * user to request that behavior by using the 'acpi_old_suspend_ordering'
142 * kernel command line option that causes the following variable to be set.
144 static bool old_suspend_ordering;
146 void __init acpi_old_suspend_ordering(void)
148 old_suspend_ordering = true;
151 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
153 acpi_old_suspend_ordering();
157 static int __init init_nvs_nosave(const struct dmi_system_id *d)
163 static bool acpi_sleep_no_lps0;
165 static int __init init_no_lps0(const struct dmi_system_id *d)
167 acpi_sleep_no_lps0 = true;
171 static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
173 .callback = init_old_suspend_ordering,
174 .ident = "Abit KN9 (nForce4 variant)",
176 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
177 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
181 .callback = init_old_suspend_ordering,
182 .ident = "HP xw4600 Workstation",
184 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
185 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
189 .callback = init_old_suspend_ordering,
190 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
192 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
193 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
197 .callback = init_old_suspend_ordering,
198 .ident = "Panasonic CF51-2L",
200 DMI_MATCH(DMI_BOARD_VENDOR,
201 "Matsushita Electric Industrial Co.,Ltd."),
202 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
206 .callback = init_nvs_nosave,
207 .ident = "Sony Vaio VGN-FW41E_H",
209 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
214 .callback = init_nvs_nosave,
215 .ident = "Sony Vaio VGN-FW21E",
217 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
222 .callback = init_nvs_nosave,
223 .ident = "Sony Vaio VGN-FW21M",
225 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
230 .callback = init_nvs_nosave,
231 .ident = "Sony Vaio VPCEB17FX",
233 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
238 .callback = init_nvs_nosave,
239 .ident = "Sony Vaio VGN-SR11M",
241 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
242 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
246 .callback = init_nvs_nosave,
247 .ident = "Everex StepNote Series",
249 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
250 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
254 .callback = init_nvs_nosave,
255 .ident = "Sony Vaio VPCEB1Z1E",
257 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
262 .callback = init_nvs_nosave,
263 .ident = "Sony Vaio VGN-NW130D",
265 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
270 .callback = init_nvs_nosave,
271 .ident = "Sony Vaio VPCCW29FX",
273 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
274 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
278 .callback = init_nvs_nosave,
279 .ident = "Averatec AV1020-ED2",
281 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
282 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
286 .callback = init_old_suspend_ordering,
287 .ident = "Asus A8N-SLI DELUXE",
289 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
294 .callback = init_old_suspend_ordering,
295 .ident = "Asus A8N-SLI Premium",
297 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
298 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
302 .callback = init_nvs_nosave,
303 .ident = "Sony Vaio VGN-SR26GN_P",
305 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
310 .callback = init_nvs_nosave,
311 .ident = "Sony Vaio VPCEB1S1E",
313 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
318 .callback = init_nvs_nosave,
319 .ident = "Sony Vaio VGN-FW520F",
321 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
322 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
326 .callback = init_nvs_nosave,
327 .ident = "Asus K54C",
329 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
334 .callback = init_nvs_nosave,
335 .ident = "Asus K54HR",
337 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
338 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
342 .callback = init_nvs_save_s3,
343 .ident = "Asus 1025C",
345 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
346 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
350 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
351 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
355 .callback = init_nvs_save_s3,
356 .ident = "Lenovo G50-45",
358 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
359 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
363 .callback = init_nvs_save_s3,
364 .ident = "Lenovo G40-45",
366 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
367 DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
371 * https://bugzilla.kernel.org/show_bug.cgi?id=196907
372 * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
373 * S0 Idle firmware interface.
376 .callback = init_no_lps0,
377 .ident = "Dell XPS13 9360",
379 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
380 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
384 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
385 * the Low Power S0 Idle firmware interface (see
386 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
389 .callback = init_no_lps0,
390 .ident = "ThinkPad X1 Tablet(2016)",
392 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
393 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
399 static bool ignore_blacklist;
401 void __init acpi_sleep_no_blacklist(void)
403 ignore_blacklist = true;
406 static void __init acpi_sleep_dmi_check(void)
408 if (ignore_blacklist)
411 if (dmi_get_bios_year() >= 2012)
412 acpi_nvs_nosave_s3();
414 dmi_check_system(acpisleep_dmi_table);
418 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
420 static int acpi_pm_freeze(void)
422 acpi_disable_all_gpes();
423 acpi_os_wait_events_complete();
424 acpi_ec_block_transactions();
429 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
431 static int acpi_pm_pre_suspend(void)
434 return suspend_nvs_save();
438 * __acpi_pm_prepare - Prepare the platform to enter the target state.
440 * If necessary, set the firmware waking vector and do arch-specific
441 * nastiness to get the wakeup code to the waking vector.
443 static int __acpi_pm_prepare(void)
445 int error = acpi_sleep_prepare(acpi_target_sleep_state);
447 acpi_target_sleep_state = ACPI_STATE_S0;
453 * acpi_pm_prepare - Prepare the platform to enter the target sleep
454 * state and disable the GPEs.
456 static int acpi_pm_prepare(void)
458 int error = __acpi_pm_prepare();
460 error = acpi_pm_pre_suspend();
465 static int find_powerf_dev(struct device *dev, void *data)
467 struct acpi_device *device = to_acpi_device(dev);
468 const char *hid = acpi_device_hid(device);
470 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
474 * acpi_pm_finish - Instruct the platform to leave a sleep state.
476 * This is called after we wake back up (or if entering the sleep state
479 static void acpi_pm_finish(void)
481 struct device *pwr_btn_dev;
482 u32 acpi_state = acpi_target_sleep_state;
484 acpi_ec_unblock_transactions();
487 if (acpi_state == ACPI_STATE_S0)
490 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
492 acpi_disable_wakeup_devices(acpi_state);
493 acpi_leave_sleep_state(acpi_state);
495 /* reset firmware waking vector */
496 acpi_set_waking_vector(0);
498 acpi_target_sleep_state = ACPI_STATE_S0;
500 acpi_resume_power_resources();
502 /* If we were woken with the fixed power button, provide a small
503 * hint to userspace in the form of a wakeup event on the fixed power
504 * button device (if it can be found).
506 * We delay the event generation til now, as the PM layer requires
507 * timekeeping to be running before we generate events. */
508 if (!pwr_btn_event_pending)
511 pwr_btn_event_pending = false;
512 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
515 pm_wakeup_event(pwr_btn_dev, 0);
516 put_device(pwr_btn_dev);
521 * acpi_pm_start - Start system PM transition.
523 static void acpi_pm_start(u32 acpi_state)
525 acpi_target_sleep_state = acpi_state;
526 acpi_sleep_tts_switch(acpi_target_sleep_state);
527 acpi_scan_lock_acquire();
531 * acpi_pm_end - Finish up system PM transition.
533 static void acpi_pm_end(void)
535 acpi_turn_off_unused_power_resources();
536 acpi_scan_lock_release();
538 * This is necessary in case acpi_pm_finish() is not called during a
539 * failing transition to a sleep state.
541 acpi_target_sleep_state = ACPI_STATE_S0;
542 acpi_sleep_tts_switch(acpi_target_sleep_state);
544 #else /* !CONFIG_ACPI_SLEEP */
545 #define acpi_target_sleep_state ACPI_STATE_S0
546 #define acpi_sleep_no_lps0 (false)
547 static inline void acpi_sleep_dmi_check(void) {}
548 #endif /* CONFIG_ACPI_SLEEP */
550 #ifdef CONFIG_SUSPEND
551 static u32 acpi_suspend_states[] = {
552 [PM_SUSPEND_ON] = ACPI_STATE_S0,
553 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
554 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
555 [PM_SUSPEND_MAX] = ACPI_STATE_S5
559 * acpi_suspend_begin - Set the target system sleep state to the state
560 * associated with given @pm_state, if supported.
562 static int acpi_suspend_begin(suspend_state_t pm_state)
564 u32 acpi_state = acpi_suspend_states[pm_state];
567 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
571 if (!sleep_states[acpi_state]) {
572 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
575 if (acpi_state > ACPI_STATE_S1)
576 pm_set_suspend_via_firmware();
578 acpi_pm_start(acpi_state);
583 * acpi_suspend_enter - Actually enter a sleep state.
586 * Flush caches and go to sleep. For STR we have to call arch-specific
587 * assembly, which in turn call acpi_enter_sleep_state().
588 * It's unfortunate, but it works. Please fix if you're feeling frisky.
590 static int acpi_suspend_enter(suspend_state_t pm_state)
592 acpi_status status = AE_OK;
593 u32 acpi_state = acpi_target_sleep_state;
596 ACPI_FLUSH_CPU_CACHE();
598 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
599 switch (acpi_state) {
602 status = acpi_enter_sleep_state(acpi_state);
606 if (!acpi_suspend_lowlevel)
608 error = acpi_suspend_lowlevel();
611 pr_info(PREFIX "Low-level resume complete\n");
612 pm_set_resume_via_firmware();
615 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
617 /* This violates the spec but is required for bug compatibility. */
618 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
620 /* Reprogram control registers */
621 acpi_leave_sleep_state_prep(acpi_state);
623 /* ACPI 3.0 specs (P62) says that it's the responsibility
624 * of the OSPM to clear the status bit [ implying that the
625 * POWER_BUTTON event should not reach userspace ]
627 * However, we do generate a small hint for userspace in the form of
628 * a wakeup event. We flag this condition for now and generate the
629 * event later, as we're currently too early in resume to be able to
630 * generate wakeup events.
632 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
633 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
635 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
637 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
638 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
640 pwr_btn_event_pending = true;
645 * Disable and clear GPE status before interrupt is enabled. Some GPEs
646 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
647 * acpi_leave_sleep_state will reenable specific GPEs later
649 acpi_disable_all_gpes();
650 /* Allow EC transactions to happen. */
651 acpi_ec_unblock_transactions();
653 suspend_nvs_restore();
655 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
658 static int acpi_suspend_state_valid(suspend_state_t pm_state)
664 case PM_SUSPEND_STANDBY:
666 acpi_state = acpi_suspend_states[pm_state];
668 return sleep_states[acpi_state];
674 static const struct platform_suspend_ops acpi_suspend_ops = {
675 .valid = acpi_suspend_state_valid,
676 .begin = acpi_suspend_begin,
677 .prepare_late = acpi_pm_prepare,
678 .enter = acpi_suspend_enter,
679 .wake = acpi_pm_finish,
684 * acpi_suspend_begin_old - Set the target system sleep state to the
685 * state associated with given @pm_state, if supported, and
686 * execute the _PTS control method. This function is used if the
687 * pre-ACPI 2.0 suspend ordering has been requested.
689 static int acpi_suspend_begin_old(suspend_state_t pm_state)
691 int error = acpi_suspend_begin(pm_state);
693 error = __acpi_pm_prepare();
699 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
702 static const struct platform_suspend_ops acpi_suspend_ops_old = {
703 .valid = acpi_suspend_state_valid,
704 .begin = acpi_suspend_begin_old,
705 .prepare_late = acpi_pm_pre_suspend,
706 .enter = acpi_suspend_enter,
707 .wake = acpi_pm_finish,
709 .recover = acpi_pm_finish,
712 static bool s2idle_in_progress;
713 static bool s2idle_wakeup;
716 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
717 * device object with the PNP0D80 compatible device ID (System Power Management
718 * Controller) and a specific _DSM method under it. That method, if present,
719 * can be used to indicate to the platform that the OS is transitioning into a
720 * low-power state in which certain types of activity are not desirable or that
721 * it is leaving such a state, which allows the platform to adjust its operation
724 static const struct acpi_device_id lps0_device_ids[] = {
729 #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
731 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
732 #define ACPI_LPS0_SCREEN_OFF 3
733 #define ACPI_LPS0_SCREEN_ON 4
734 #define ACPI_LPS0_ENTRY 5
735 #define ACPI_LPS0_EXIT 6
737 static acpi_handle lps0_device_handle;
738 static guid_t lps0_dsm_guid;
739 static char lps0_dsm_func_mask;
741 /* Device constraint entry structure */
742 struct lpi_device_info {
745 union acpi_object *package;
748 /* Constraint package structure */
749 struct lpi_device_constraint {
755 struct lpi_constraints {
760 static struct lpi_constraints *lpi_constraints_table;
761 static int lpi_constraints_table_size;
763 static void lpi_device_get_constraints(void)
765 union acpi_object *out_obj;
768 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
769 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
770 NULL, ACPI_TYPE_PACKAGE);
772 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
773 out_obj ? "successful" : "failed");
778 lpi_constraints_table = kcalloc(out_obj->package.count,
779 sizeof(*lpi_constraints_table),
781 if (!lpi_constraints_table)
782 goto free_acpi_buffer;
784 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
786 for (i = 0; i < out_obj->package.count; i++) {
787 struct lpi_constraints *constraint;
789 union acpi_object *package = &out_obj->package.elements[i];
790 struct lpi_device_info info = { };
791 int package_count = 0, j;
796 for (j = 0; j < package->package.count; ++j) {
797 union acpi_object *element =
798 &(package->package.elements[j]);
800 switch (element->type) {
801 case ACPI_TYPE_INTEGER:
802 info.enabled = element->integer.value;
804 case ACPI_TYPE_STRING:
805 info.name = element->string.pointer;
807 case ACPI_TYPE_PACKAGE:
808 package_count = element->package.count;
809 info.package = element->package.elements;
814 if (!info.enabled || !info.package || !info.name)
817 constraint = &lpi_constraints_table[lpi_constraints_table_size];
819 status = acpi_get_handle(NULL, info.name, &constraint->handle);
820 if (ACPI_FAILURE(status))
823 acpi_handle_debug(lps0_device_handle,
824 "index:%d Name:%s\n", i, info.name);
826 constraint->min_dstate = -1;
828 for (j = 0; j < package_count; ++j) {
829 union acpi_object *info_obj = &info.package[j];
830 union acpi_object *cnstr_pkg;
831 union acpi_object *obj;
832 struct lpi_device_constraint dev_info;
834 switch (info_obj->type) {
835 case ACPI_TYPE_INTEGER:
838 case ACPI_TYPE_PACKAGE:
839 if (info_obj->package.count < 2)
842 cnstr_pkg = info_obj->package.elements;
844 dev_info.uid = obj->integer.value;
846 dev_info.min_dstate = obj->integer.value;
848 acpi_handle_debug(lps0_device_handle,
849 "uid:%d min_dstate:%s\n",
851 acpi_power_state_string(dev_info.min_dstate));
853 constraint->min_dstate = dev_info.min_dstate;
858 if (constraint->min_dstate < 0) {
859 acpi_handle_debug(lps0_device_handle,
860 "Incomplete constraint defined\n");
864 lpi_constraints_table_size++;
867 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
873 static void lpi_check_constraints(void)
877 for (i = 0; i < lpi_constraints_table_size; ++i) {
878 acpi_handle handle = lpi_constraints_table[i].handle;
879 struct acpi_device *adev;
881 if (!handle || acpi_bus_get_device(handle, &adev))
884 acpi_handle_debug(handle,
885 "LPI: required min power state:%s current power state:%s\n",
886 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
887 acpi_power_state_string(adev->power.state));
889 if (!adev->flags.power_manageable) {
890 acpi_handle_info(handle, "LPI: Device not power manageable\n");
891 lpi_constraints_table[i].handle = NULL;
895 if (adev->power.state < lpi_constraints_table[i].min_dstate)
896 acpi_handle_info(handle,
897 "LPI: Constraint not met; min power state:%s current power state:%s\n",
898 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
899 acpi_power_state_string(adev->power.state));
903 static void acpi_sleep_run_lps0_dsm(unsigned int func)
905 union acpi_object *out_obj;
907 if (!(lps0_dsm_func_mask & (1 << func)))
910 out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
913 acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
914 func, out_obj ? "successful" : "failed");
917 static int lps0_device_attach(struct acpi_device *adev,
918 const struct acpi_device_id *not_used)
920 union acpi_object *out_obj;
922 if (lps0_device_handle)
925 if (acpi_sleep_no_lps0) {
926 acpi_handle_info(adev->handle,
927 "Low Power S0 Idle interface disabled\n");
931 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
934 guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
935 /* Check if the _DSM is present and as expected. */
936 out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
937 if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
938 char bitmask = *(char *)out_obj->buffer.pointer;
940 lps0_dsm_func_mask = bitmask;
941 lps0_device_handle = adev->handle;
943 * Use suspend-to-idle by default if the default
944 * suspend mode was not set from the command line.
946 if (mem_sleep_default > PM_SUSPEND_MEM)
947 mem_sleep_current = PM_SUSPEND_TO_IDLE;
949 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
952 acpi_ec_mark_gpe_for_wake();
954 acpi_handle_debug(adev->handle,
955 "_DSM function 0 evaluation failed\n");
959 lpi_device_get_constraints();
964 static struct acpi_scan_handler lps0_handler = {
965 .ids = lps0_device_ids,
966 .attach = lps0_device_attach,
969 static int acpi_s2idle_begin(void)
971 acpi_scan_lock_acquire();
972 s2idle_in_progress = true;
976 static int acpi_s2idle_prepare(void)
978 if (lps0_device_handle) {
979 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
980 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
982 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
985 if (acpi_sci_irq_valid())
986 enable_irq_wake(acpi_sci_irq);
988 acpi_enable_wakeup_devices(ACPI_STATE_S0);
990 /* Change the configuration of GPEs to avoid spurious wakeup. */
991 acpi_enable_all_wakeup_gpes();
992 acpi_os_wait_events_complete();
996 static void acpi_s2idle_wake(void)
999 if (pm_debug_messages_on)
1000 lpi_check_constraints();
1003 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
1004 * that the SCI has triggered while suspended, so cancel the wakeup in
1005 * case it has not been a wakeup event (the GPEs will be checked later).
1007 if (acpi_sci_irq_valid() &&
1008 !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1009 pm_system_cancel_wakeup();
1010 s2idle_wakeup = true;
1012 * On some platforms with the LPS0 _DSM device noirq resume
1013 * takes too much time for EC wakeup events to survive, so look
1016 if (lps0_device_handle)
1017 acpi_ec_dispatch_gpe();
1021 static void acpi_s2idle_sync(void)
1024 * Process all pending events in case there are any wakeup ones.
1026 * The EC driver uses the system workqueue and an additional special
1027 * one, so those need to be flushed too.
1029 acpi_os_wait_events_complete(); /* synchronize SCI IRQ handling */
1030 acpi_ec_flush_work();
1031 acpi_os_wait_events_complete(); /* synchronize Notify handling */
1032 s2idle_wakeup = false;
1035 static void acpi_s2idle_restore(void)
1037 acpi_enable_all_runtime_gpes();
1039 acpi_disable_wakeup_devices(ACPI_STATE_S0);
1041 if (acpi_sci_irq_valid())
1042 disable_irq_wake(acpi_sci_irq);
1044 if (lps0_device_handle) {
1045 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1047 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1048 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1052 static void acpi_s2idle_end(void)
1054 s2idle_in_progress = false;
1055 acpi_scan_lock_release();
1058 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1059 .begin = acpi_s2idle_begin,
1060 .prepare = acpi_s2idle_prepare,
1061 .wake = acpi_s2idle_wake,
1062 .sync = acpi_s2idle_sync,
1063 .restore = acpi_s2idle_restore,
1064 .end = acpi_s2idle_end,
1067 static void acpi_sleep_suspend_setup(void)
1071 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1072 if (acpi_sleep_state_supported(i))
1073 sleep_states[i] = 1;
1075 suspend_set_ops(old_suspend_ordering ?
1076 &acpi_suspend_ops_old : &acpi_suspend_ops);
1078 acpi_scan_add_handler(&lps0_handler);
1079 s2idle_set_ops(&acpi_s2idle_ops);
1082 #else /* !CONFIG_SUSPEND */
1083 #define s2idle_in_progress (false)
1084 #define s2idle_wakeup (false)
1085 #define lps0_device_handle (NULL)
1086 static inline void acpi_sleep_suspend_setup(void) {}
1087 #endif /* !CONFIG_SUSPEND */
1089 bool acpi_s2idle_wakeup(void)
1091 return s2idle_wakeup;
1094 bool acpi_sleep_no_ec_events(void)
1096 return !s2idle_in_progress || !lps0_device_handle;
1099 #ifdef CONFIG_PM_SLEEP
1100 static u32 saved_bm_rld;
1102 static int acpi_save_bm_rld(void)
1104 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1108 static void acpi_restore_bm_rld(void)
1110 u32 resumed_bm_rld = 0;
1112 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1113 if (resumed_bm_rld == saved_bm_rld)
1116 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1119 static struct syscore_ops acpi_sleep_syscore_ops = {
1120 .suspend = acpi_save_bm_rld,
1121 .resume = acpi_restore_bm_rld,
1124 static void acpi_sleep_syscore_init(void)
1126 register_syscore_ops(&acpi_sleep_syscore_ops);
1129 static inline void acpi_sleep_syscore_init(void) {}
1130 #endif /* CONFIG_PM_SLEEP */
1132 #ifdef CONFIG_HIBERNATION
1133 static unsigned long s4_hardware_signature;
1134 static struct acpi_table_facs *facs;
1135 static bool nosigcheck;
1137 void __init acpi_no_s4_hw_signature(void)
1142 static int acpi_hibernation_begin(void)
1146 error = nvs_nosave ? 0 : suspend_nvs_alloc();
1148 acpi_pm_start(ACPI_STATE_S4);
1153 static int acpi_hibernation_enter(void)
1155 acpi_status status = AE_OK;
1157 ACPI_FLUSH_CPU_CACHE();
1159 /* This shouldn't return. If it returns, we have a problem */
1160 status = acpi_enter_sleep_state(ACPI_STATE_S4);
1161 /* Reprogram control registers */
1162 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1164 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1167 static void acpi_hibernation_leave(void)
1169 pm_set_resume_via_firmware();
1171 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1175 /* Reprogram control registers */
1176 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1177 /* Check the hardware signature */
1178 if (facs && s4_hardware_signature != facs->hardware_signature)
1179 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1180 /* Restore the NVS memory area */
1181 suspend_nvs_restore();
1182 /* Allow EC transactions to happen. */
1183 acpi_ec_unblock_transactions();
1186 static void acpi_pm_thaw(void)
1188 acpi_ec_unblock_transactions();
1189 acpi_enable_all_runtime_gpes();
1192 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1193 .begin = acpi_hibernation_begin,
1195 .pre_snapshot = acpi_pm_prepare,
1196 .finish = acpi_pm_finish,
1197 .prepare = acpi_pm_prepare,
1198 .enter = acpi_hibernation_enter,
1199 .leave = acpi_hibernation_leave,
1200 .pre_restore = acpi_pm_freeze,
1201 .restore_cleanup = acpi_pm_thaw,
1205 * acpi_hibernation_begin_old - Set the target system sleep state to
1206 * ACPI_STATE_S4 and execute the _PTS control method. This
1207 * function is used if the pre-ACPI 2.0 suspend ordering has been
1210 static int acpi_hibernation_begin_old(void)
1214 * The _TTS object should always be evaluated before the _PTS object.
1215 * When the old_suspended_ordering is true, the _PTS object is
1216 * evaluated in the acpi_sleep_prepare.
1218 acpi_sleep_tts_switch(ACPI_STATE_S4);
1220 error = acpi_sleep_prepare(ACPI_STATE_S4);
1224 error = suspend_nvs_alloc();
1226 acpi_target_sleep_state = ACPI_STATE_S4;
1227 acpi_scan_lock_acquire();
1234 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1237 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1238 .begin = acpi_hibernation_begin_old,
1240 .pre_snapshot = acpi_pm_pre_suspend,
1241 .prepare = acpi_pm_freeze,
1242 .finish = acpi_pm_finish,
1243 .enter = acpi_hibernation_enter,
1244 .leave = acpi_hibernation_leave,
1245 .pre_restore = acpi_pm_freeze,
1246 .restore_cleanup = acpi_pm_thaw,
1247 .recover = acpi_pm_finish,
1250 static void acpi_sleep_hibernate_setup(void)
1252 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1255 hibernation_set_ops(old_suspend_ordering ?
1256 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1257 sleep_states[ACPI_STATE_S4] = 1;
1261 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1263 s4_hardware_signature = facs->hardware_signature;
1265 #else /* !CONFIG_HIBERNATION */
1266 static inline void acpi_sleep_hibernate_setup(void) {}
1267 #endif /* !CONFIG_HIBERNATION */
1269 static void acpi_power_off_prepare(void)
1271 /* Prepare to power off the system */
1272 acpi_sleep_prepare(ACPI_STATE_S5);
1273 acpi_disable_all_gpes();
1274 acpi_os_wait_events_complete();
1277 static void acpi_power_off(void)
1279 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1280 printk(KERN_DEBUG "%s called\n", __func__);
1281 local_irq_disable();
1282 acpi_enter_sleep_state(ACPI_STATE_S5);
1285 int __init acpi_sleep_init(void)
1287 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1288 char *pos = supported;
1291 acpi_sleep_dmi_check();
1293 sleep_states[ACPI_STATE_S0] = 1;
1295 acpi_sleep_syscore_init();
1296 acpi_sleep_suspend_setup();
1297 acpi_sleep_hibernate_setup();
1299 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1300 sleep_states[ACPI_STATE_S5] = 1;
1301 pm_power_off_prepare = acpi_power_off_prepare;
1302 pm_power_off = acpi_power_off;
1308 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1309 if (sleep_states[i])
1310 pos += sprintf(pos, " S%d", i);
1312 pr_info(PREFIX "(supports%s)\n", supported);
1315 * Register the tts_notifier to reboot notifier list so that the _TTS
1316 * object can also be evaluated when the system enters S5.
1318 register_reboot_notifier(&tts_notifier);