1 // SPDX-License-Identifier: GPL-2.0-only
3 * sleep.c - ACPI sleep support.
5 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
6 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
7 * Copyright (c) 2000-2003 Patrick Mochel
8 * Copyright (c) 2003 Open Source Development Lab
11 #include <linux/delay.h>
12 #include <linux/irq.h>
13 #include <linux/dmi.h>
14 #include <linux/device.h>
15 #include <linux/interrupt.h>
16 #include <linux/suspend.h>
17 #include <linux/reboot.h>
18 #include <linux/acpi.h>
19 #include <linux/module.h>
20 #include <linux/syscore_ops.h>
22 #include <trace/events/power.h>
28 * Some HW-full platforms do not have _S5, so they may need
29 * to leverage efi power off for a shutdown.
32 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
34 static void acpi_sleep_tts_switch(u32 acpi_state
)
38 status
= acpi_execute_simple_method(NULL
, "\\_TTS", acpi_state
);
39 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
41 * OS can't evaluate the _TTS object correctly. Some warning
42 * message will be printed. But it won't break anything.
44 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
48 static int tts_notify_reboot(struct notifier_block
*this,
49 unsigned long code
, void *x
)
51 acpi_sleep_tts_switch(ACPI_STATE_S5
);
55 static struct notifier_block tts_notifier
= {
56 .notifier_call
= tts_notify_reboot
,
61 static int acpi_sleep_prepare(u32 acpi_state
)
63 #ifdef CONFIG_ACPI_SLEEP
64 /* do we have a wakeup address for S2 and S3? */
65 if (acpi_state
== ACPI_STATE_S3
) {
66 if (!acpi_wakeup_address
)
68 acpi_set_waking_vector(acpi_wakeup_address
);
71 ACPI_FLUSH_CPU_CACHE();
73 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
75 acpi_enable_wakeup_devices(acpi_state
);
76 acpi_enter_sleep_state_prep(acpi_state
);
80 bool acpi_sleep_state_supported(u8 sleep_state
)
85 status
= acpi_get_sleep_type_data(sleep_state
, &type_a
, &type_b
);
86 return ACPI_SUCCESS(status
) && (!acpi_gbl_reduced_hardware
87 || (acpi_gbl_FADT
.sleep_control
.address
88 && acpi_gbl_FADT
.sleep_status
.address
));
91 #ifdef CONFIG_ACPI_SLEEP
92 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
94 u32
acpi_target_system_state(void)
96 return acpi_target_sleep_state
;
98 EXPORT_SYMBOL_GPL(acpi_target_system_state
);
100 static bool pwr_btn_event_pending
;
103 * The ACPI specification wants us to save NVS memory regions during hibernation
104 * and to restore them during the subsequent resume. Windows does that also for
105 * suspend to RAM. However, it is known that this mechanism does not work on
106 * all machines, so we allow the user to disable it with the help of the
107 * 'acpi_sleep=nonvs' kernel command line option.
109 static bool nvs_nosave
;
111 void __init
acpi_nvs_nosave(void)
117 * The ACPI specification wants us to save NVS memory regions during hibernation
118 * but says nothing about saving NVS during S3. Not all versions of Windows
119 * save NVS on S3 suspend either, and it is clear that not all systems need
120 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
121 * user to disable saving NVS on S3 if their system does not require it, but
122 * continue to save/restore NVS for S4 as specified.
124 static bool nvs_nosave_s3
;
126 void __init
acpi_nvs_nosave_s3(void)
128 nvs_nosave_s3
= true;
131 static int __init
init_nvs_save_s3(const struct dmi_system_id
*d
)
133 nvs_nosave_s3
= false;
138 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
139 * user to request that behavior by using the 'acpi_old_suspend_ordering'
140 * kernel command line option that causes the following variable to be set.
142 static bool old_suspend_ordering
;
144 void __init
acpi_old_suspend_ordering(void)
146 old_suspend_ordering
= true;
149 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
151 acpi_old_suspend_ordering();
155 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
161 static bool acpi_sleep_no_lps0
;
163 static int __init
init_no_lps0(const struct dmi_system_id
*d
)
165 acpi_sleep_no_lps0
= true;
169 static const struct dmi_system_id acpisleep_dmi_table
[] __initconst
= {
171 .callback
= init_old_suspend_ordering
,
172 .ident
= "Abit KN9 (nForce4 variant)",
174 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
175 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
179 .callback
= init_old_suspend_ordering
,
180 .ident
= "HP xw4600 Workstation",
182 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
183 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
187 .callback
= init_old_suspend_ordering
,
188 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
190 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
191 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
195 .callback
= init_old_suspend_ordering
,
196 .ident
= "Panasonic CF51-2L",
198 DMI_MATCH(DMI_BOARD_VENDOR
,
199 "Matsushita Electric Industrial Co.,Ltd."),
200 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
204 .callback
= init_nvs_nosave
,
205 .ident
= "Sony Vaio VGN-FW41E_H",
207 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
208 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW41E_H"),
212 .callback
= init_nvs_nosave
,
213 .ident
= "Sony Vaio VGN-FW21E",
215 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
216 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
220 .callback
= init_nvs_nosave
,
221 .ident
= "Sony Vaio VGN-FW21M",
223 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
224 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21M"),
228 .callback
= init_nvs_nosave
,
229 .ident
= "Sony Vaio VPCEB17FX",
231 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
232 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
236 .callback
= init_nvs_nosave
,
237 .ident
= "Sony Vaio VGN-SR11M",
239 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
240 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
244 .callback
= init_nvs_nosave
,
245 .ident
= "Everex StepNote Series",
247 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
248 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
252 .callback
= init_nvs_nosave
,
253 .ident
= "Sony Vaio VPCEB1Z1E",
255 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
256 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
260 .callback
= init_nvs_nosave
,
261 .ident
= "Sony Vaio VGN-NW130D",
263 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
264 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
268 .callback
= init_nvs_nosave
,
269 .ident
= "Sony Vaio VPCCW29FX",
271 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
272 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
276 .callback
= init_nvs_nosave
,
277 .ident
= "Averatec AV1020-ED2",
279 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
280 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
284 .callback
= init_old_suspend_ordering
,
285 .ident
= "Asus A8N-SLI DELUXE",
287 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
288 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
292 .callback
= init_old_suspend_ordering
,
293 .ident
= "Asus A8N-SLI Premium",
295 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
296 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
300 .callback
= init_nvs_nosave
,
301 .ident
= "Sony Vaio VGN-SR26GN_P",
303 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
304 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
308 .callback
= init_nvs_nosave
,
309 .ident
= "Sony Vaio VPCEB1S1E",
311 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
312 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1S1E"),
316 .callback
= init_nvs_nosave
,
317 .ident
= "Sony Vaio VGN-FW520F",
319 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
320 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
324 .callback
= init_nvs_nosave
,
325 .ident
= "Asus K54C",
327 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
328 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
332 .callback
= init_nvs_nosave
,
333 .ident
= "Asus K54HR",
335 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
336 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
340 .callback
= init_nvs_save_s3
,
341 .ident
= "Asus 1025C",
343 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK COMPUTER INC."),
344 DMI_MATCH(DMI_PRODUCT_NAME
, "1025C"),
348 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
349 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
353 .callback
= init_nvs_save_s3
,
354 .ident
= "Lenovo G50-45",
356 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
357 DMI_MATCH(DMI_PRODUCT_NAME
, "80E3"),
361 * https://bugzilla.kernel.org/show_bug.cgi?id=196907
362 * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
363 * S0 Idle firmware interface.
366 .callback
= init_no_lps0
,
367 .ident
= "Dell XPS13 9360",
369 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
370 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS 13 9360"),
374 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
375 * the Low Power S0 Idle firmware interface (see
376 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
379 .callback
= init_no_lps0
,
380 .ident
= "ThinkPad X1 Tablet(2016)",
382 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
383 DMI_MATCH(DMI_PRODUCT_NAME
, "20GGA00L00"),
389 static bool ignore_blacklist
;
391 void __init
acpi_sleep_no_blacklist(void)
393 ignore_blacklist
= true;
396 static void __init
acpi_sleep_dmi_check(void)
398 if (ignore_blacklist
)
401 if (dmi_get_bios_year() >= 2012)
402 acpi_nvs_nosave_s3();
404 dmi_check_system(acpisleep_dmi_table
);
408 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
410 static int acpi_pm_freeze(void)
412 acpi_disable_all_gpes();
413 acpi_os_wait_events_complete();
414 acpi_ec_block_transactions();
419 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
421 static int acpi_pm_pre_suspend(void)
424 return suspend_nvs_save();
428 * __acpi_pm_prepare - Prepare the platform to enter the target state.
430 * If necessary, set the firmware waking vector and do arch-specific
431 * nastiness to get the wakeup code to the waking vector.
433 static int __acpi_pm_prepare(void)
435 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
437 acpi_target_sleep_state
= ACPI_STATE_S0
;
443 * acpi_pm_prepare - Prepare the platform to enter the target sleep
444 * state and disable the GPEs.
446 static int acpi_pm_prepare(void)
448 int error
= __acpi_pm_prepare();
450 error
= acpi_pm_pre_suspend();
456 * acpi_pm_finish - Instruct the platform to leave a sleep state.
458 * This is called after we wake back up (or if entering the sleep state
461 static void acpi_pm_finish(void)
463 struct acpi_device
*pwr_btn_adev
;
464 u32 acpi_state
= acpi_target_sleep_state
;
466 acpi_ec_unblock_transactions();
469 if (acpi_state
== ACPI_STATE_S0
)
472 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
474 acpi_disable_wakeup_devices(acpi_state
);
475 acpi_leave_sleep_state(acpi_state
);
477 /* reset firmware waking vector */
478 acpi_set_waking_vector(0);
480 acpi_target_sleep_state
= ACPI_STATE_S0
;
482 acpi_resume_power_resources();
484 /* If we were woken with the fixed power button, provide a small
485 * hint to userspace in the form of a wakeup event on the fixed power
486 * button device (if it can be found).
488 * We delay the event generation til now, as the PM layer requires
489 * timekeeping to be running before we generate events. */
490 if (!pwr_btn_event_pending
)
493 pwr_btn_event_pending
= false;
494 pwr_btn_adev
= acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF
,
497 pm_wakeup_event(&pwr_btn_adev
->dev
, 0);
498 acpi_dev_put(pwr_btn_adev
);
503 * acpi_pm_start - Start system PM transition.
505 static void acpi_pm_start(u32 acpi_state
)
507 acpi_target_sleep_state
= acpi_state
;
508 acpi_sleep_tts_switch(acpi_target_sleep_state
);
509 acpi_scan_lock_acquire();
513 * acpi_pm_end - Finish up system PM transition.
515 static void acpi_pm_end(void)
517 acpi_turn_off_unused_power_resources();
518 acpi_scan_lock_release();
520 * This is necessary in case acpi_pm_finish() is not called during a
521 * failing transition to a sleep state.
523 acpi_target_sleep_state
= ACPI_STATE_S0
;
524 acpi_sleep_tts_switch(acpi_target_sleep_state
);
526 #else /* !CONFIG_ACPI_SLEEP */
527 #define acpi_target_sleep_state ACPI_STATE_S0
528 #define acpi_sleep_no_lps0 (false)
529 static inline void acpi_sleep_dmi_check(void) {}
530 #endif /* CONFIG_ACPI_SLEEP */
532 #ifdef CONFIG_SUSPEND
533 static u32 acpi_suspend_states
[] = {
534 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
535 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
536 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
537 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
541 * acpi_suspend_begin - Set the target system sleep state to the state
542 * associated with given @pm_state, if supported.
544 static int acpi_suspend_begin(suspend_state_t pm_state
)
546 u32 acpi_state
= acpi_suspend_states
[pm_state
];
549 error
= (nvs_nosave
|| nvs_nosave_s3
) ? 0 : suspend_nvs_alloc();
553 if (!sleep_states
[acpi_state
]) {
554 pr_err("ACPI does not support sleep state S%u\n", acpi_state
);
557 if (acpi_state
> ACPI_STATE_S1
)
558 pm_set_suspend_via_firmware();
560 acpi_pm_start(acpi_state
);
565 * acpi_suspend_enter - Actually enter a sleep state.
568 * Flush caches and go to sleep. For STR we have to call arch-specific
569 * assembly, which in turn call acpi_enter_sleep_state().
570 * It's unfortunate, but it works. Please fix if you're feeling frisky.
572 static int acpi_suspend_enter(suspend_state_t pm_state
)
574 acpi_status status
= AE_OK
;
575 u32 acpi_state
= acpi_target_sleep_state
;
578 ACPI_FLUSH_CPU_CACHE();
580 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, true);
581 switch (acpi_state
) {
584 status
= acpi_enter_sleep_state(acpi_state
);
588 if (!acpi_suspend_lowlevel
)
590 error
= acpi_suspend_lowlevel();
593 pr_info(PREFIX
"Low-level resume complete\n");
594 pm_set_resume_via_firmware();
597 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, false);
599 /* This violates the spec but is required for bug compatibility. */
600 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
602 /* Reprogram control registers */
603 acpi_leave_sleep_state_prep(acpi_state
);
605 /* ACPI 3.0 specs (P62) says that it's the responsibility
606 * of the OSPM to clear the status bit [ implying that the
607 * POWER_BUTTON event should not reach userspace ]
609 * However, we do generate a small hint for userspace in the form of
610 * a wakeup event. We flag this condition for now and generate the
611 * event later, as we're currently too early in resume to be able to
612 * generate wakeup events.
614 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
615 acpi_event_status pwr_btn_status
= ACPI_EVENT_FLAG_DISABLED
;
617 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
619 if (pwr_btn_status
& ACPI_EVENT_FLAG_STATUS_SET
) {
620 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
622 pwr_btn_event_pending
= true;
627 * Disable and clear GPE status before interrupt is enabled. Some GPEs
628 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
629 * acpi_leave_sleep_state will reenable specific GPEs later
631 acpi_disable_all_gpes();
632 /* Allow EC transactions to happen. */
633 acpi_ec_unblock_transactions();
635 suspend_nvs_restore();
637 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
640 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
646 case PM_SUSPEND_STANDBY
:
648 acpi_state
= acpi_suspend_states
[pm_state
];
650 return sleep_states
[acpi_state
];
656 static const struct platform_suspend_ops acpi_suspend_ops
= {
657 .valid
= acpi_suspend_state_valid
,
658 .begin
= acpi_suspend_begin
,
659 .prepare_late
= acpi_pm_prepare
,
660 .enter
= acpi_suspend_enter
,
661 .wake
= acpi_pm_finish
,
666 * acpi_suspend_begin_old - Set the target system sleep state to the
667 * state associated with given @pm_state, if supported, and
668 * execute the _PTS control method. This function is used if the
669 * pre-ACPI 2.0 suspend ordering has been requested.
671 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
673 int error
= acpi_suspend_begin(pm_state
);
675 error
= __acpi_pm_prepare();
681 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
684 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
685 .valid
= acpi_suspend_state_valid
,
686 .begin
= acpi_suspend_begin_old
,
687 .prepare_late
= acpi_pm_pre_suspend
,
688 .enter
= acpi_suspend_enter
,
689 .wake
= acpi_pm_finish
,
691 .recover
= acpi_pm_finish
,
694 static bool s2idle_in_progress
;
695 static bool s2idle_wakeup
;
698 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
699 * device object with the PNP0D80 compatible device ID (System Power Management
700 * Controller) and a specific _DSM method under it. That method, if present,
701 * can be used to indicate to the platform that the OS is transitioning into a
702 * low-power state in which certain types of activity are not desirable or that
703 * it is leaving such a state, which allows the platform to adjust its operation
706 static const struct acpi_device_id lps0_device_ids
[] = {
711 #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
713 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
714 #define ACPI_LPS0_SCREEN_OFF 3
715 #define ACPI_LPS0_SCREEN_ON 4
716 #define ACPI_LPS0_ENTRY 5
717 #define ACPI_LPS0_EXIT 6
719 static acpi_handle lps0_device_handle
;
720 static guid_t lps0_dsm_guid
;
721 static char lps0_dsm_func_mask
;
723 /* Device constraint entry structure */
724 struct lpi_device_info
{
727 union acpi_object
*package
;
730 /* Constraint package structure */
731 struct lpi_device_constraint
{
737 struct lpi_constraints
{
742 static struct lpi_constraints
*lpi_constraints_table
;
743 static int lpi_constraints_table_size
;
745 static void lpi_device_get_constraints(void)
747 union acpi_object
*out_obj
;
750 out_obj
= acpi_evaluate_dsm_typed(lps0_device_handle
, &lps0_dsm_guid
,
751 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS
,
752 NULL
, ACPI_TYPE_PACKAGE
);
754 acpi_handle_debug(lps0_device_handle
, "_DSM function 1 eval %s\n",
755 out_obj
? "successful" : "failed");
760 lpi_constraints_table
= kcalloc(out_obj
->package
.count
,
761 sizeof(*lpi_constraints_table
),
763 if (!lpi_constraints_table
)
764 goto free_acpi_buffer
;
766 acpi_handle_debug(lps0_device_handle
, "LPI: constraints list begin:\n");
768 for (i
= 0; i
< out_obj
->package
.count
; i
++) {
769 struct lpi_constraints
*constraint
;
771 union acpi_object
*package
= &out_obj
->package
.elements
[i
];
772 struct lpi_device_info info
= { };
773 int package_count
= 0, j
;
778 for (j
= 0; j
< package
->package
.count
; ++j
) {
779 union acpi_object
*element
=
780 &(package
->package
.elements
[j
]);
782 switch (element
->type
) {
783 case ACPI_TYPE_INTEGER
:
784 info
.enabled
= element
->integer
.value
;
786 case ACPI_TYPE_STRING
:
787 info
.name
= element
->string
.pointer
;
789 case ACPI_TYPE_PACKAGE
:
790 package_count
= element
->package
.count
;
791 info
.package
= element
->package
.elements
;
796 if (!info
.enabled
|| !info
.package
|| !info
.name
)
799 constraint
= &lpi_constraints_table
[lpi_constraints_table_size
];
801 status
= acpi_get_handle(NULL
, info
.name
, &constraint
->handle
);
802 if (ACPI_FAILURE(status
))
805 acpi_handle_debug(lps0_device_handle
,
806 "index:%d Name:%s\n", i
, info
.name
);
808 constraint
->min_dstate
= -1;
810 for (j
= 0; j
< package_count
; ++j
) {
811 union acpi_object
*info_obj
= &info
.package
[j
];
812 union acpi_object
*cnstr_pkg
;
813 union acpi_object
*obj
;
814 struct lpi_device_constraint dev_info
;
816 switch (info_obj
->type
) {
817 case ACPI_TYPE_INTEGER
:
820 case ACPI_TYPE_PACKAGE
:
821 if (info_obj
->package
.count
< 2)
824 cnstr_pkg
= info_obj
->package
.elements
;
826 dev_info
.uid
= obj
->integer
.value
;
828 dev_info
.min_dstate
= obj
->integer
.value
;
830 acpi_handle_debug(lps0_device_handle
,
831 "uid:%d min_dstate:%s\n",
833 acpi_power_state_string(dev_info
.min_dstate
));
835 constraint
->min_dstate
= dev_info
.min_dstate
;
840 if (constraint
->min_dstate
< 0) {
841 acpi_handle_debug(lps0_device_handle
,
842 "Incomplete constraint defined\n");
846 lpi_constraints_table_size
++;
849 acpi_handle_debug(lps0_device_handle
, "LPI: constraints list end\n");
855 static void lpi_check_constraints(void)
859 for (i
= 0; i
< lpi_constraints_table_size
; ++i
) {
860 acpi_handle handle
= lpi_constraints_table
[i
].handle
;
861 struct acpi_device
*adev
;
863 if (!handle
|| acpi_bus_get_device(handle
, &adev
))
866 acpi_handle_debug(handle
,
867 "LPI: required min power state:%s current power state:%s\n",
868 acpi_power_state_string(lpi_constraints_table
[i
].min_dstate
),
869 acpi_power_state_string(adev
->power
.state
));
871 if (!adev
->flags
.power_manageable
) {
872 acpi_handle_info(handle
, "LPI: Device not power manageable\n");
873 lpi_constraints_table
[i
].handle
= NULL
;
877 if (adev
->power
.state
< lpi_constraints_table
[i
].min_dstate
)
878 acpi_handle_info(handle
,
879 "LPI: Constraint not met; min power state:%s current power state:%s\n",
880 acpi_power_state_string(lpi_constraints_table
[i
].min_dstate
),
881 acpi_power_state_string(adev
->power
.state
));
885 static void acpi_sleep_run_lps0_dsm(unsigned int func
)
887 union acpi_object
*out_obj
;
889 if (!(lps0_dsm_func_mask
& (1 << func
)))
892 out_obj
= acpi_evaluate_dsm(lps0_device_handle
, &lps0_dsm_guid
, 1, func
, NULL
);
895 acpi_handle_debug(lps0_device_handle
, "_DSM function %u evaluation %s\n",
896 func
, out_obj
? "successful" : "failed");
899 static int lps0_device_attach(struct acpi_device
*adev
,
900 const struct acpi_device_id
*not_used
)
902 union acpi_object
*out_obj
;
904 if (lps0_device_handle
)
907 if (acpi_sleep_no_lps0
) {
908 acpi_handle_info(adev
->handle
,
909 "Low Power S0 Idle interface disabled\n");
913 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_LOW_POWER_S0
))
916 guid_parse(ACPI_LPS0_DSM_UUID
, &lps0_dsm_guid
);
917 /* Check if the _DSM is present and as expected. */
918 out_obj
= acpi_evaluate_dsm(adev
->handle
, &lps0_dsm_guid
, 1, 0, NULL
);
919 if (out_obj
&& out_obj
->type
== ACPI_TYPE_BUFFER
) {
920 char bitmask
= *(char *)out_obj
->buffer
.pointer
;
922 lps0_dsm_func_mask
= bitmask
;
923 lps0_device_handle
= adev
->handle
;
925 * Use suspend-to-idle by default if the default
926 * suspend mode was not set from the command line.
928 if (mem_sleep_default
> PM_SUSPEND_MEM
)
929 mem_sleep_current
= PM_SUSPEND_TO_IDLE
;
931 acpi_handle_debug(adev
->handle
, "_DSM function mask: 0x%x\n",
934 acpi_ec_mark_gpe_for_wake();
936 acpi_handle_debug(adev
->handle
,
937 "_DSM function 0 evaluation failed\n");
941 lpi_device_get_constraints();
946 static struct acpi_scan_handler lps0_handler
= {
947 .ids
= lps0_device_ids
,
948 .attach
= lps0_device_attach
,
951 static int acpi_s2idle_begin(void)
953 acpi_scan_lock_acquire();
954 s2idle_in_progress
= true;
958 static int acpi_s2idle_prepare(void)
960 if (lps0_device_handle
) {
961 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF
);
962 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY
);
964 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE
);
967 if (acpi_sci_irq_valid())
968 enable_irq_wake(acpi_sci_irq
);
970 acpi_enable_wakeup_devices(ACPI_STATE_S0
);
972 /* Change the configuration of GPEs to avoid spurious wakeup. */
973 acpi_enable_all_wakeup_gpes();
974 acpi_os_wait_events_complete();
976 s2idle_wakeup
= true;
980 static void acpi_s2idle_wake(void)
982 if (!lps0_device_handle
)
985 if (pm_debug_messages_on
)
986 lpi_check_constraints();
989 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
990 * that the SCI has triggered while suspended, so cancel the wakeup in
991 * case it has not been a wakeup event (the GPEs will be checked later).
993 if (acpi_sci_irq_valid() &&
994 !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq
))) {
995 pm_system_cancel_wakeup();
997 * On some platforms with the LPS0 _DSM device noirq resume
998 * takes too much time for EC wakeup events to survive, so look
1001 acpi_ec_dispatch_gpe();
1005 static void acpi_s2idle_sync(void)
1008 * Process all pending events in case there are any wakeup ones.
1010 * The EC driver uses the system workqueue and an additional special
1011 * one, so those need to be flushed too.
1013 acpi_os_wait_events_complete(); /* synchronize SCI IRQ handling */
1014 acpi_ec_flush_work();
1015 acpi_os_wait_events_complete(); /* synchronize Notify handling */
1018 static void acpi_s2idle_restore(void)
1020 s2idle_wakeup
= false;
1022 acpi_enable_all_runtime_gpes();
1024 acpi_disable_wakeup_devices(ACPI_STATE_S0
);
1026 if (acpi_sci_irq_valid())
1027 disable_irq_wake(acpi_sci_irq
);
1029 if (lps0_device_handle
) {
1030 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE
);
1032 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT
);
1033 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON
);
1037 static void acpi_s2idle_end(void)
1039 s2idle_in_progress
= false;
1040 acpi_scan_lock_release();
1043 static const struct platform_s2idle_ops acpi_s2idle_ops
= {
1044 .begin
= acpi_s2idle_begin
,
1045 .prepare
= acpi_s2idle_prepare
,
1046 .wake
= acpi_s2idle_wake
,
1047 .sync
= acpi_s2idle_sync
,
1048 .restore
= acpi_s2idle_restore
,
1049 .end
= acpi_s2idle_end
,
1052 static void acpi_sleep_suspend_setup(void)
1056 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++)
1057 if (acpi_sleep_state_supported(i
))
1058 sleep_states
[i
] = 1;
1060 suspend_set_ops(old_suspend_ordering
?
1061 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
1063 acpi_scan_add_handler(&lps0_handler
);
1064 s2idle_set_ops(&acpi_s2idle_ops
);
1067 #else /* !CONFIG_SUSPEND */
1068 #define s2idle_in_progress (false)
1069 #define s2idle_wakeup (false)
1070 #define lps0_device_handle (NULL)
1071 static inline void acpi_sleep_suspend_setup(void) {}
1072 #endif /* !CONFIG_SUSPEND */
1074 bool acpi_s2idle_wakeup(void)
1076 return s2idle_wakeup
;
1079 bool acpi_sleep_no_ec_events(void)
1081 return !s2idle_in_progress
|| !lps0_device_handle
;
1084 #ifdef CONFIG_PM_SLEEP
1085 static u32 saved_bm_rld
;
1087 static int acpi_save_bm_rld(void)
1089 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &saved_bm_rld
);
1093 static void acpi_restore_bm_rld(void)
1095 u32 resumed_bm_rld
= 0;
1097 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &resumed_bm_rld
);
1098 if (resumed_bm_rld
== saved_bm_rld
)
1101 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, saved_bm_rld
);
1104 static struct syscore_ops acpi_sleep_syscore_ops
= {
1105 .suspend
= acpi_save_bm_rld
,
1106 .resume
= acpi_restore_bm_rld
,
1109 static void acpi_sleep_syscore_init(void)
1111 register_syscore_ops(&acpi_sleep_syscore_ops
);
1114 static inline void acpi_sleep_syscore_init(void) {}
1115 #endif /* CONFIG_PM_SLEEP */
1117 #ifdef CONFIG_HIBERNATION
1118 static unsigned long s4_hardware_signature
;
1119 static struct acpi_table_facs
*facs
;
1120 static bool nosigcheck
;
1122 void __init
acpi_no_s4_hw_signature(void)
1127 static int acpi_hibernation_begin(pm_message_t stage
)
1130 int error
= suspend_nvs_alloc();
1135 if (stage
.event
== PM_EVENT_HIBERNATE
)
1136 pm_set_suspend_via_firmware();
1138 acpi_pm_start(ACPI_STATE_S4
);
1142 static int acpi_hibernation_enter(void)
1144 acpi_status status
= AE_OK
;
1146 ACPI_FLUSH_CPU_CACHE();
1148 /* This shouldn't return. If it returns, we have a problem */
1149 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
1150 /* Reprogram control registers */
1151 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
1153 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
1156 static void acpi_hibernation_leave(void)
1158 pm_set_resume_via_firmware();
1160 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1164 /* Reprogram control registers */
1165 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
1166 /* Check the hardware signature */
1167 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
)
1168 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1169 /* Restore the NVS memory area */
1170 suspend_nvs_restore();
1171 /* Allow EC transactions to happen. */
1172 acpi_ec_unblock_transactions();
1175 static void acpi_pm_thaw(void)
1177 acpi_ec_unblock_transactions();
1178 acpi_enable_all_runtime_gpes();
1181 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
1182 .begin
= acpi_hibernation_begin
,
1184 .pre_snapshot
= acpi_pm_prepare
,
1185 .finish
= acpi_pm_finish
,
1186 .prepare
= acpi_pm_prepare
,
1187 .enter
= acpi_hibernation_enter
,
1188 .leave
= acpi_hibernation_leave
,
1189 .pre_restore
= acpi_pm_freeze
,
1190 .restore_cleanup
= acpi_pm_thaw
,
1194 * acpi_hibernation_begin_old - Set the target system sleep state to
1195 * ACPI_STATE_S4 and execute the _PTS control method. This
1196 * function is used if the pre-ACPI 2.0 suspend ordering has been
1199 static int acpi_hibernation_begin_old(pm_message_t stage
)
1203 * The _TTS object should always be evaluated before the _PTS object.
1204 * When the old_suspended_ordering is true, the _PTS object is
1205 * evaluated in the acpi_sleep_prepare.
1207 acpi_sleep_tts_switch(ACPI_STATE_S4
);
1209 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
1214 error
= suspend_nvs_alloc();
1219 if (stage
.event
== PM_EVENT_HIBERNATE
)
1220 pm_set_suspend_via_firmware();
1222 acpi_target_sleep_state
= ACPI_STATE_S4
;
1223 acpi_scan_lock_acquire();
1228 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1231 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
1232 .begin
= acpi_hibernation_begin_old
,
1234 .pre_snapshot
= acpi_pm_pre_suspend
,
1235 .prepare
= acpi_pm_freeze
,
1236 .finish
= acpi_pm_finish
,
1237 .enter
= acpi_hibernation_enter
,
1238 .leave
= acpi_hibernation_leave
,
1239 .pre_restore
= acpi_pm_freeze
,
1240 .restore_cleanup
= acpi_pm_thaw
,
1241 .recover
= acpi_pm_finish
,
1244 static void acpi_sleep_hibernate_setup(void)
1246 if (!acpi_sleep_state_supported(ACPI_STATE_S4
))
1249 hibernation_set_ops(old_suspend_ordering
?
1250 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
1251 sleep_states
[ACPI_STATE_S4
] = 1;
1255 acpi_get_table(ACPI_SIG_FACS
, 1, (struct acpi_table_header
**)&facs
);
1257 s4_hardware_signature
= facs
->hardware_signature
;
1259 #else /* !CONFIG_HIBERNATION */
1260 static inline void acpi_sleep_hibernate_setup(void) {}
1261 #endif /* !CONFIG_HIBERNATION */
1263 static void acpi_power_off_prepare(void)
1265 /* Prepare to power off the system */
1266 acpi_sleep_prepare(ACPI_STATE_S5
);
1267 acpi_disable_all_gpes();
1268 acpi_os_wait_events_complete();
1271 static void acpi_power_off(void)
1273 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1274 printk(KERN_DEBUG
"%s called\n", __func__
);
1275 local_irq_disable();
1276 acpi_enter_sleep_state(ACPI_STATE_S5
);
1279 int __init
acpi_sleep_init(void)
1281 char supported
[ACPI_S_STATE_COUNT
* 3 + 1];
1282 char *pos
= supported
;
1285 acpi_sleep_dmi_check();
1287 sleep_states
[ACPI_STATE_S0
] = 1;
1289 acpi_sleep_syscore_init();
1290 acpi_sleep_suspend_setup();
1291 acpi_sleep_hibernate_setup();
1293 if (acpi_sleep_state_supported(ACPI_STATE_S5
)) {
1294 sleep_states
[ACPI_STATE_S5
] = 1;
1295 pm_power_off_prepare
= acpi_power_off_prepare
;
1296 pm_power_off
= acpi_power_off
;
1302 for (i
= 0; i
< ACPI_S_STATE_COUNT
; i
++) {
1303 if (sleep_states
[i
])
1304 pos
+= sprintf(pos
, " S%d", i
);
1306 pr_info(PREFIX
"(supports%s)\n", supported
);
1309 * Register the tts_notifier to reboot notifier list so that the _TTS
1310 * object can also be evaluated when the system enters S5.
1312 register_reboot_notifier(&tts_notifier
);