![Rajat Jain](/assets/img/avatar_default.png)
I noticed that recently multiple systems (chromebooks) couldn't wake from S0ix using LID or Keyboard after updating to a newer kernel. I bisected and it turned up commitf941d3e41d
("ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idle"). I checked that the issue got fixed if that commit was reverted. I debugged and found that although PNP0C0D:00 (representing the LID) is wake capable and should wakeup the system per the code in acpi_wakeup_gpe_init() and in drivers/acpi/button.c: localhost /sys # cat /proc/acpi/wakeup Device S-state Status Sysfs node LID0 S4 *enabled platform:PNP0C0D:00 CREC S5 *disabled platform:GOOG0004:00 *disabled platform:cros-ec-dev.1.auto *disabled platform:cros-ec-accel.0 *disabled platform:cros-ec-accel.1 *disabled platform:cros-ec-gyro.0 *disabled platform:cros-ec-ring.0 *disabled platform:cros-usbpd-charger.2.auto *disabled platform:cros-usbpd-logger.3.auto D015 S3 *enabled i2c:i2c-ELAN0000:00 PENH S3 *enabled platform:PRP0001:00 XHCI S3 *enabled pci:0000:00:14.0 GLAN S4 *disabled WIFI S3 *disabled pci:0000:00:14.3 localhost /sys # On debugging, I found that its corresponding GPE is not being enabled. The particular GPE's "gpe_register_info->enable_for_wake" does not have any bits set when acpi_enable_all_wakeup_gpes() comes around to use it. I looked at code and could not find any other code path that should set the bits in "enable_for_wake" bitmask for the wake enabled devices for s2idle. [I do see that it happens for S3 in acpi_sleep_prepare()]. Thus I used the same call to enable the GPEs for wake enabled devices, and verified that this fixes the regression I was seeing on multiple of my devices. [ rjw: The problem is that commitf941d3e41d
("ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idle") forgot to add the acpi_enable_wakeup_devices() call for s2idle along with acpi_enable_all_wakeup_gpes(). ] Fixes:f941d3e41d
("ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idle") Link: https://bugzilla.kernel.org/show_bug.cgi?id=203579 Signed-off-by: Rajat Jain <rajatja@google.com> [ rjw: Subject & changelog ] Cc: 5.0+ <stable@vger.kernel.org> # 5.0+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1314 lines
32 KiB
C
1314 lines
32 KiB
C
/*
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* sleep.c - ACPI sleep support.
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*
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* Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
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* Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2000-2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2.
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*
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*/
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/dmi.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/suspend.h>
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#include <linux/reboot.h>
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/syscore_ops.h>
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#include <asm/io.h>
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#include <trace/events/power.h>
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#include "internal.h"
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#include "sleep.h"
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/*
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* Some HW-full platforms do not have _S5, so they may need
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* to leverage efi power off for a shutdown.
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*/
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bool acpi_no_s5;
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static u8 sleep_states[ACPI_S_STATE_COUNT];
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static void acpi_sleep_tts_switch(u32 acpi_state)
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{
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acpi_status status;
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status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
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/*
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* OS can't evaluate the _TTS object correctly. Some warning
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* message will be printed. But it won't break anything.
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*/
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printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
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}
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}
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static int tts_notify_reboot(struct notifier_block *this,
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unsigned long code, void *x)
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{
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acpi_sleep_tts_switch(ACPI_STATE_S5);
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return NOTIFY_DONE;
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}
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static struct notifier_block tts_notifier = {
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.notifier_call = tts_notify_reboot,
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.next = NULL,
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.priority = 0,
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};
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static int acpi_sleep_prepare(u32 acpi_state)
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{
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#ifdef CONFIG_ACPI_SLEEP
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/* do we have a wakeup address for S2 and S3? */
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if (acpi_state == ACPI_STATE_S3) {
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if (!acpi_wakeup_address)
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return -EFAULT;
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acpi_set_waking_vector(acpi_wakeup_address);
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}
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ACPI_FLUSH_CPU_CACHE();
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#endif
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printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
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acpi_state);
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acpi_enable_wakeup_devices(acpi_state);
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acpi_enter_sleep_state_prep(acpi_state);
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return 0;
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}
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static bool acpi_sleep_state_supported(u8 sleep_state)
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{
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acpi_status status;
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u8 type_a, type_b;
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status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
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return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
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|| (acpi_gbl_FADT.sleep_control.address
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&& acpi_gbl_FADT.sleep_status.address));
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}
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#ifdef CONFIG_ACPI_SLEEP
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static u32 acpi_target_sleep_state = ACPI_STATE_S0;
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u32 acpi_target_system_state(void)
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{
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return acpi_target_sleep_state;
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}
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EXPORT_SYMBOL_GPL(acpi_target_system_state);
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static bool pwr_btn_event_pending;
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/*
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* The ACPI specification wants us to save NVS memory regions during hibernation
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* and to restore them during the subsequent resume. Windows does that also for
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* suspend to RAM. However, it is known that this mechanism does not work on
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* all machines, so we allow the user to disable it with the help of the
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* 'acpi_sleep=nonvs' kernel command line option.
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*/
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static bool nvs_nosave;
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void __init acpi_nvs_nosave(void)
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{
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nvs_nosave = true;
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}
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/*
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* The ACPI specification wants us to save NVS memory regions during hibernation
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* but says nothing about saving NVS during S3. Not all versions of Windows
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* save NVS on S3 suspend either, and it is clear that not all systems need
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* NVS to be saved at S3 time. To improve suspend/resume time, allow the
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* user to disable saving NVS on S3 if their system does not require it, but
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* continue to save/restore NVS for S4 as specified.
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*/
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static bool nvs_nosave_s3;
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void __init acpi_nvs_nosave_s3(void)
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{
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nvs_nosave_s3 = true;
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}
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static int __init init_nvs_save_s3(const struct dmi_system_id *d)
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{
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nvs_nosave_s3 = false;
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return 0;
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}
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/*
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* ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
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* user to request that behavior by using the 'acpi_old_suspend_ordering'
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* kernel command line option that causes the following variable to be set.
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*/
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static bool old_suspend_ordering;
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void __init acpi_old_suspend_ordering(void)
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{
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old_suspend_ordering = true;
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}
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static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
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{
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acpi_old_suspend_ordering();
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return 0;
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}
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static int __init init_nvs_nosave(const struct dmi_system_id *d)
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{
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acpi_nvs_nosave();
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return 0;
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}
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static bool acpi_sleep_no_lps0;
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static int __init init_no_lps0(const struct dmi_system_id *d)
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{
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acpi_sleep_no_lps0 = true;
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return 0;
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}
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static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
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{
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.callback = init_old_suspend_ordering,
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.ident = "Abit KN9 (nForce4 variant)",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
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DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "HP xw4600 Workstation",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Panasonic CF51-2L",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR,
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"Matsushita Electric Industrial Co.,Ltd."),
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DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-FW41E_H",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-FW21E",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-FW21M",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VPCEB17FX",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-SR11M",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Everex StepNote Series",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VPCEB1Z1E",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-NW130D",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VPCCW29FX",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Averatec AV1020-ED2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
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DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Asus A8N-SLI DELUXE",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
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},
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},
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{
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.callback = init_old_suspend_ordering,
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.ident = "Asus A8N-SLI Premium",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-SR26GN_P",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VPCEB1S1E",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Sony Vaio VGN-FW520F",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Asus K54C",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
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},
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},
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{
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.callback = init_nvs_nosave,
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.ident = "Asus K54HR",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
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},
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},
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{
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.callback = init_nvs_save_s3,
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.ident = "Asus 1025C",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
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DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
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},
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},
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/*
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* https://bugzilla.kernel.org/show_bug.cgi?id=189431
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* Lenovo G50-45 is a platform later than 2012, but needs nvs memory
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* saving during S3.
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*/
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{
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.callback = init_nvs_save_s3,
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.ident = "Lenovo G50-45",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
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},
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},
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/*
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* https://bugzilla.kernel.org/show_bug.cgi?id=196907
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* Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
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* S0 Idle firmware interface.
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*/
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{
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.callback = init_no_lps0,
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.ident = "Dell XPS13 9360",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
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},
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},
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/*
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* ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
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* the Low Power S0 Idle firmware interface (see
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* https://bugzilla.kernel.org/show_bug.cgi?id=199057).
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*/
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{
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.callback = init_no_lps0,
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.ident = "ThinkPad X1 Tablet(2016)",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
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},
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},
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{},
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};
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static bool ignore_blacklist;
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void __init acpi_sleep_no_blacklist(void)
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{
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ignore_blacklist = true;
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}
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static void __init acpi_sleep_dmi_check(void)
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{
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if (ignore_blacklist)
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return;
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if (dmi_get_bios_year() >= 2012)
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acpi_nvs_nosave_s3();
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dmi_check_system(acpisleep_dmi_table);
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}
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/**
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* acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
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*/
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static int acpi_pm_freeze(void)
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{
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acpi_disable_all_gpes();
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acpi_os_wait_events_complete();
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acpi_ec_block_transactions();
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return 0;
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}
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/**
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* acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
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*/
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static int acpi_pm_pre_suspend(void)
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{
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acpi_pm_freeze();
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return suspend_nvs_save();
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}
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/**
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* __acpi_pm_prepare - Prepare the platform to enter the target state.
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*
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* If necessary, set the firmware waking vector and do arch-specific
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* nastiness to get the wakeup code to the waking vector.
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*/
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static int __acpi_pm_prepare(void)
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{
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int error = acpi_sleep_prepare(acpi_target_sleep_state);
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if (error)
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acpi_target_sleep_state = ACPI_STATE_S0;
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return error;
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}
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/**
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* acpi_pm_prepare - Prepare the platform to enter the target sleep
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* state and disable the GPEs.
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*/
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static int acpi_pm_prepare(void)
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{
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int error = __acpi_pm_prepare();
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if (!error)
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error = acpi_pm_pre_suspend();
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|
return error;
|
|
}
|
|
|
|
static int find_powerf_dev(struct device *dev, void *data)
|
|
{
|
|
struct acpi_device *device = to_acpi_device(dev);
|
|
const char *hid = acpi_device_hid(device);
|
|
|
|
return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_finish - Instruct the platform to leave a sleep state.
|
|
*
|
|
* This is called after we wake back up (or if entering the sleep state
|
|
* failed).
|
|
*/
|
|
static void acpi_pm_finish(void)
|
|
{
|
|
struct device *pwr_btn_dev;
|
|
u32 acpi_state = acpi_target_sleep_state;
|
|
|
|
acpi_ec_unblock_transactions();
|
|
suspend_nvs_free();
|
|
|
|
if (acpi_state == ACPI_STATE_S0)
|
|
return;
|
|
|
|
printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
|
|
acpi_state);
|
|
acpi_disable_wakeup_devices(acpi_state);
|
|
acpi_leave_sleep_state(acpi_state);
|
|
|
|
/* reset firmware waking vector */
|
|
acpi_set_waking_vector(0);
|
|
|
|
acpi_target_sleep_state = ACPI_STATE_S0;
|
|
|
|
acpi_resume_power_resources();
|
|
|
|
/* If we were woken with the fixed power button, provide a small
|
|
* hint to userspace in the form of a wakeup event on the fixed power
|
|
* button device (if it can be found).
|
|
*
|
|
* We delay the event generation til now, as the PM layer requires
|
|
* timekeeping to be running before we generate events. */
|
|
if (!pwr_btn_event_pending)
|
|
return;
|
|
|
|
pwr_btn_event_pending = false;
|
|
pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
|
|
find_powerf_dev);
|
|
if (pwr_btn_dev) {
|
|
pm_wakeup_event(pwr_btn_dev, 0);
|
|
put_device(pwr_btn_dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_start - Start system PM transition.
|
|
*/
|
|
static void acpi_pm_start(u32 acpi_state)
|
|
{
|
|
acpi_target_sleep_state = acpi_state;
|
|
acpi_sleep_tts_switch(acpi_target_sleep_state);
|
|
acpi_scan_lock_acquire();
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_end - Finish up system PM transition.
|
|
*/
|
|
static void acpi_pm_end(void)
|
|
{
|
|
acpi_turn_off_unused_power_resources();
|
|
acpi_scan_lock_release();
|
|
/*
|
|
* This is necessary in case acpi_pm_finish() is not called during a
|
|
* failing transition to a sleep state.
|
|
*/
|
|
acpi_target_sleep_state = ACPI_STATE_S0;
|
|
acpi_sleep_tts_switch(acpi_target_sleep_state);
|
|
}
|
|
#else /* !CONFIG_ACPI_SLEEP */
|
|
#define acpi_target_sleep_state ACPI_STATE_S0
|
|
#define acpi_sleep_no_lps0 (false)
|
|
static inline void acpi_sleep_dmi_check(void) {}
|
|
#endif /* CONFIG_ACPI_SLEEP */
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
static u32 acpi_suspend_states[] = {
|
|
[PM_SUSPEND_ON] = ACPI_STATE_S0,
|
|
[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
|
|
[PM_SUSPEND_MEM] = ACPI_STATE_S3,
|
|
[PM_SUSPEND_MAX] = ACPI_STATE_S5
|
|
};
|
|
|
|
/**
|
|
* acpi_suspend_begin - Set the target system sleep state to the state
|
|
* associated with given @pm_state, if supported.
|
|
*/
|
|
static int acpi_suspend_begin(suspend_state_t pm_state)
|
|
{
|
|
u32 acpi_state = acpi_suspend_states[pm_state];
|
|
int error;
|
|
|
|
error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
|
|
if (error)
|
|
return error;
|
|
|
|
if (!sleep_states[acpi_state]) {
|
|
pr_err("ACPI does not support sleep state S%u\n", acpi_state);
|
|
return -ENOSYS;
|
|
}
|
|
if (acpi_state > ACPI_STATE_S1)
|
|
pm_set_suspend_via_firmware();
|
|
|
|
acpi_pm_start(acpi_state);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_suspend_enter - Actually enter a sleep state.
|
|
* @pm_state: ignored
|
|
*
|
|
* Flush caches and go to sleep. For STR we have to call arch-specific
|
|
* assembly, which in turn call acpi_enter_sleep_state().
|
|
* It's unfortunate, but it works. Please fix if you're feeling frisky.
|
|
*/
|
|
static int acpi_suspend_enter(suspend_state_t pm_state)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
u32 acpi_state = acpi_target_sleep_state;
|
|
int error;
|
|
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
|
|
trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
|
|
switch (acpi_state) {
|
|
case ACPI_STATE_S1:
|
|
barrier();
|
|
status = acpi_enter_sleep_state(acpi_state);
|
|
break;
|
|
|
|
case ACPI_STATE_S3:
|
|
if (!acpi_suspend_lowlevel)
|
|
return -ENOSYS;
|
|
error = acpi_suspend_lowlevel();
|
|
if (error)
|
|
return error;
|
|
pr_info(PREFIX "Low-level resume complete\n");
|
|
pm_set_resume_via_firmware();
|
|
break;
|
|
}
|
|
trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
|
|
|
|
/* This violates the spec but is required for bug compatibility. */
|
|
acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
|
|
|
|
/* Reprogram control registers */
|
|
acpi_leave_sleep_state_prep(acpi_state);
|
|
|
|
/* ACPI 3.0 specs (P62) says that it's the responsibility
|
|
* of the OSPM to clear the status bit [ implying that the
|
|
* POWER_BUTTON event should not reach userspace ]
|
|
*
|
|
* However, we do generate a small hint for userspace in the form of
|
|
* a wakeup event. We flag this condition for now and generate the
|
|
* event later, as we're currently too early in resume to be able to
|
|
* generate wakeup events.
|
|
*/
|
|
if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
|
|
acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
|
|
|
|
acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
|
|
|
|
if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
|
|
acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
|
|
/* Flag for later */
|
|
pwr_btn_event_pending = true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disable and clear GPE status before interrupt is enabled. Some GPEs
|
|
* (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
|
|
* acpi_leave_sleep_state will reenable specific GPEs later
|
|
*/
|
|
acpi_disable_all_gpes();
|
|
/* Allow EC transactions to happen. */
|
|
acpi_ec_unblock_transactions();
|
|
|
|
suspend_nvs_restore();
|
|
|
|
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
|
|
}
|
|
|
|
static int acpi_suspend_state_valid(suspend_state_t pm_state)
|
|
{
|
|
u32 acpi_state;
|
|
|
|
switch (pm_state) {
|
|
case PM_SUSPEND_ON:
|
|
case PM_SUSPEND_STANDBY:
|
|
case PM_SUSPEND_MEM:
|
|
acpi_state = acpi_suspend_states[pm_state];
|
|
|
|
return sleep_states[acpi_state];
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static const struct platform_suspend_ops acpi_suspend_ops = {
|
|
.valid = acpi_suspend_state_valid,
|
|
.begin = acpi_suspend_begin,
|
|
.prepare_late = acpi_pm_prepare,
|
|
.enter = acpi_suspend_enter,
|
|
.wake = acpi_pm_finish,
|
|
.end = acpi_pm_end,
|
|
};
|
|
|
|
/**
|
|
* acpi_suspend_begin_old - Set the target system sleep state to the
|
|
* state associated with given @pm_state, if supported, and
|
|
* execute the _PTS control method. This function is used if the
|
|
* pre-ACPI 2.0 suspend ordering has been requested.
|
|
*/
|
|
static int acpi_suspend_begin_old(suspend_state_t pm_state)
|
|
{
|
|
int error = acpi_suspend_begin(pm_state);
|
|
if (!error)
|
|
error = __acpi_pm_prepare();
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
|
|
* been requested.
|
|
*/
|
|
static const struct platform_suspend_ops acpi_suspend_ops_old = {
|
|
.valid = acpi_suspend_state_valid,
|
|
.begin = acpi_suspend_begin_old,
|
|
.prepare_late = acpi_pm_pre_suspend,
|
|
.enter = acpi_suspend_enter,
|
|
.wake = acpi_pm_finish,
|
|
.end = acpi_pm_end,
|
|
.recover = acpi_pm_finish,
|
|
};
|
|
|
|
static bool s2idle_in_progress;
|
|
static bool s2idle_wakeup;
|
|
|
|
/*
|
|
* On platforms supporting the Low Power S0 Idle interface there is an ACPI
|
|
* device object with the PNP0D80 compatible device ID (System Power Management
|
|
* Controller) and a specific _DSM method under it. That method, if present,
|
|
* can be used to indicate to the platform that the OS is transitioning into a
|
|
* low-power state in which certain types of activity are not desirable or that
|
|
* it is leaving such a state, which allows the platform to adjust its operation
|
|
* mode accordingly.
|
|
*/
|
|
static const struct acpi_device_id lps0_device_ids[] = {
|
|
{"PNP0D80", },
|
|
{"", },
|
|
};
|
|
|
|
#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
|
|
#define ACPI_LPS0_EXIT 6
|
|
|
|
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) {
|
|
acpi_handle handle = lpi_constraints_table[i].handle;
|
|
struct acpi_device *adev;
|
|
|
|
if (!handle || acpi_bus_get_device(handle, &adev))
|
|
continue;
|
|
|
|
acpi_handle_debug(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(handle, "LPI: Device not power manageable\n");
|
|
lpi_constraints_table[i].handle = NULL;
|
|
continue;
|
|
}
|
|
|
|
if (adev->power.state < lpi_constraints_table[i].min_dstate)
|
|
acpi_handle_info(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;
|
|
|
|
if (!(lps0_dsm_func_mask & (1 << func)))
|
|
return;
|
|
|
|
out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
|
|
ACPI_FREE(out_obj);
|
|
|
|
acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
|
|
func, out_obj ? "successful" : "failed");
|
|
}
|
|
|
|
static int lps0_device_attach(struct acpi_device *adev,
|
|
const struct acpi_device_id *not_used)
|
|
{
|
|
union acpi_object *out_obj;
|
|
|
|
if (lps0_device_handle)
|
|
return 0;
|
|
|
|
if (acpi_sleep_no_lps0) {
|
|
acpi_handle_info(adev->handle,
|
|
"Low Power S0 Idle interface disabled\n");
|
|
return 0;
|
|
}
|
|
|
|
if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
|
|
return 0;
|
|
|
|
guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
|
|
/* Check if the _DSM is present and as expected. */
|
|
out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
|
|
if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
|
|
char bitmask = *(char *)out_obj->buffer.pointer;
|
|
|
|
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",
|
|
bitmask);
|
|
|
|
acpi_ec_mark_gpe_for_wake();
|
|
} else {
|
|
acpi_handle_debug(adev->handle,
|
|
"_DSM function 0 evaluation failed\n");
|
|
}
|
|
ACPI_FREE(out_obj);
|
|
|
|
lpi_device_get_constraints();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct acpi_scan_handler lps0_handler = {
|
|
.ids = lps0_device_ids,
|
|
.attach = lps0_device_attach,
|
|
};
|
|
|
|
static int acpi_s2idle_begin(void)
|
|
{
|
|
acpi_scan_lock_acquire();
|
|
s2idle_in_progress = true;
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_s2idle_prepare(void)
|
|
{
|
|
if (lps0_device_handle) {
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
|
|
|
|
acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
|
|
}
|
|
|
|
if (acpi_sci_irq_valid())
|
|
enable_irq_wake(acpi_sci_irq);
|
|
|
|
acpi_enable_wakeup_devices(ACPI_STATE_S0);
|
|
|
|
/* Change the configuration of GPEs to avoid spurious wakeup. */
|
|
acpi_enable_all_wakeup_gpes();
|
|
acpi_os_wait_events_complete();
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_s2idle_wake(void)
|
|
{
|
|
if (!lps0_device_handle)
|
|
return;
|
|
|
|
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
|
|
* case it has not been a wakeup event (the GPEs will be checked later).
|
|
*/
|
|
if (acpi_sci_irq_valid() &&
|
|
!irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
|
|
pm_system_cancel_wakeup();
|
|
s2idle_wakeup = true;
|
|
/*
|
|
* On some platforms with the LPS0 _DSM device noirq resume
|
|
* takes too much time for EC wakeup events to survive, so look
|
|
* for them now.
|
|
*/
|
|
acpi_ec_dispatch_gpe();
|
|
}
|
|
}
|
|
|
|
static void acpi_s2idle_sync(void)
|
|
{
|
|
/*
|
|
* Process all pending events in case there are any wakeup ones.
|
|
*
|
|
* The EC driver uses the system workqueue and an additional special
|
|
* one, so those need to be flushed too.
|
|
*/
|
|
acpi_os_wait_events_complete(); /* synchronize SCI IRQ handling */
|
|
acpi_ec_flush_work();
|
|
acpi_os_wait_events_complete(); /* synchronize Notify handling */
|
|
s2idle_wakeup = false;
|
|
}
|
|
|
|
static void acpi_s2idle_restore(void)
|
|
{
|
|
acpi_enable_all_runtime_gpes();
|
|
|
|
acpi_disable_wakeup_devices(ACPI_STATE_S0);
|
|
|
|
if (acpi_sci_irq_valid())
|
|
disable_irq_wake(acpi_sci_irq);
|
|
|
|
if (lps0_device_handle) {
|
|
acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
|
|
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
|
|
acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
|
|
}
|
|
}
|
|
|
|
static void acpi_s2idle_end(void)
|
|
{
|
|
s2idle_in_progress = false;
|
|
acpi_scan_lock_release();
|
|
}
|
|
|
|
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)
|
|
{
|
|
int i;
|
|
|
|
for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
|
|
if (acpi_sleep_state_supported(i))
|
|
sleep_states[i] = 1;
|
|
|
|
suspend_set_ops(old_suspend_ordering ?
|
|
&acpi_suspend_ops_old : &acpi_suspend_ops);
|
|
|
|
acpi_scan_add_handler(&lps0_handler);
|
|
s2idle_set_ops(&acpi_s2idle_ops);
|
|
}
|
|
|
|
#else /* !CONFIG_SUSPEND */
|
|
#define s2idle_in_progress (false)
|
|
#define s2idle_wakeup (false)
|
|
#define lps0_device_handle (NULL)
|
|
static inline void acpi_sleep_suspend_setup(void) {}
|
|
#endif /* !CONFIG_SUSPEND */
|
|
|
|
bool acpi_s2idle_wakeup(void)
|
|
{
|
|
return s2idle_wakeup;
|
|
}
|
|
|
|
bool acpi_sleep_no_ec_events(void)
|
|
{
|
|
return !s2idle_in_progress || !lps0_device_handle;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static u32 saved_bm_rld;
|
|
|
|
static int acpi_save_bm_rld(void)
|
|
{
|
|
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_restore_bm_rld(void)
|
|
{
|
|
u32 resumed_bm_rld = 0;
|
|
|
|
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
|
|
if (resumed_bm_rld == saved_bm_rld)
|
|
return;
|
|
|
|
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
|
|
}
|
|
|
|
static struct syscore_ops acpi_sleep_syscore_ops = {
|
|
.suspend = acpi_save_bm_rld,
|
|
.resume = acpi_restore_bm_rld,
|
|
};
|
|
|
|
static void acpi_sleep_syscore_init(void)
|
|
{
|
|
register_syscore_ops(&acpi_sleep_syscore_ops);
|
|
}
|
|
#else
|
|
static inline void acpi_sleep_syscore_init(void) {}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
static unsigned long s4_hardware_signature;
|
|
static struct acpi_table_facs *facs;
|
|
static bool nosigcheck;
|
|
|
|
void __init acpi_no_s4_hw_signature(void)
|
|
{
|
|
nosigcheck = true;
|
|
}
|
|
|
|
static int acpi_hibernation_begin(void)
|
|
{
|
|
int error;
|
|
|
|
error = nvs_nosave ? 0 : suspend_nvs_alloc();
|
|
if (!error)
|
|
acpi_pm_start(ACPI_STATE_S4);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int acpi_hibernation_enter(void)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
|
|
/* This shouldn't return. If it returns, we have a problem */
|
|
status = acpi_enter_sleep_state(ACPI_STATE_S4);
|
|
/* Reprogram control registers */
|
|
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
|
|
|
|
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
|
|
}
|
|
|
|
static void acpi_hibernation_leave(void)
|
|
{
|
|
pm_set_resume_via_firmware();
|
|
/*
|
|
* If ACPI is not enabled by the BIOS and the boot kernel, we need to
|
|
* enable it here.
|
|
*/
|
|
acpi_enable();
|
|
/* Reprogram control registers */
|
|
acpi_leave_sleep_state_prep(ACPI_STATE_S4);
|
|
/* Check the hardware signature */
|
|
if (facs && s4_hardware_signature != facs->hardware_signature)
|
|
pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
|
|
/* Restore the NVS memory area */
|
|
suspend_nvs_restore();
|
|
/* Allow EC transactions to happen. */
|
|
acpi_ec_unblock_transactions();
|
|
}
|
|
|
|
static void acpi_pm_thaw(void)
|
|
{
|
|
acpi_ec_unblock_transactions();
|
|
acpi_enable_all_runtime_gpes();
|
|
}
|
|
|
|
static const struct platform_hibernation_ops acpi_hibernation_ops = {
|
|
.begin = acpi_hibernation_begin,
|
|
.end = acpi_pm_end,
|
|
.pre_snapshot = acpi_pm_prepare,
|
|
.finish = acpi_pm_finish,
|
|
.prepare = acpi_pm_prepare,
|
|
.enter = acpi_hibernation_enter,
|
|
.leave = acpi_hibernation_leave,
|
|
.pre_restore = acpi_pm_freeze,
|
|
.restore_cleanup = acpi_pm_thaw,
|
|
};
|
|
|
|
/**
|
|
* acpi_hibernation_begin_old - Set the target system sleep state to
|
|
* ACPI_STATE_S4 and execute the _PTS control method. This
|
|
* function is used if the pre-ACPI 2.0 suspend ordering has been
|
|
* requested.
|
|
*/
|
|
static int acpi_hibernation_begin_old(void)
|
|
{
|
|
int error;
|
|
/*
|
|
* The _TTS object should always be evaluated before the _PTS object.
|
|
* When the old_suspended_ordering is true, the _PTS object is
|
|
* evaluated in the acpi_sleep_prepare.
|
|
*/
|
|
acpi_sleep_tts_switch(ACPI_STATE_S4);
|
|
|
|
error = acpi_sleep_prepare(ACPI_STATE_S4);
|
|
|
|
if (!error) {
|
|
if (!nvs_nosave)
|
|
error = suspend_nvs_alloc();
|
|
if (!error) {
|
|
acpi_target_sleep_state = ACPI_STATE_S4;
|
|
acpi_scan_lock_acquire();
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
|
|
* been requested.
|
|
*/
|
|
static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
|
|
.begin = acpi_hibernation_begin_old,
|
|
.end = acpi_pm_end,
|
|
.pre_snapshot = acpi_pm_pre_suspend,
|
|
.prepare = acpi_pm_freeze,
|
|
.finish = acpi_pm_finish,
|
|
.enter = acpi_hibernation_enter,
|
|
.leave = acpi_hibernation_leave,
|
|
.pre_restore = acpi_pm_freeze,
|
|
.restore_cleanup = acpi_pm_thaw,
|
|
.recover = acpi_pm_finish,
|
|
};
|
|
|
|
static void acpi_sleep_hibernate_setup(void)
|
|
{
|
|
if (!acpi_sleep_state_supported(ACPI_STATE_S4))
|
|
return;
|
|
|
|
hibernation_set_ops(old_suspend_ordering ?
|
|
&acpi_hibernation_ops_old : &acpi_hibernation_ops);
|
|
sleep_states[ACPI_STATE_S4] = 1;
|
|
if (nosigcheck)
|
|
return;
|
|
|
|
acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
|
|
if (facs)
|
|
s4_hardware_signature = facs->hardware_signature;
|
|
}
|
|
#else /* !CONFIG_HIBERNATION */
|
|
static inline void acpi_sleep_hibernate_setup(void) {}
|
|
#endif /* !CONFIG_HIBERNATION */
|
|
|
|
static void acpi_power_off_prepare(void)
|
|
{
|
|
/* Prepare to power off the system */
|
|
acpi_sleep_prepare(ACPI_STATE_S5);
|
|
acpi_disable_all_gpes();
|
|
acpi_os_wait_events_complete();
|
|
}
|
|
|
|
static void acpi_power_off(void)
|
|
{
|
|
/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
|
|
printk(KERN_DEBUG "%s called\n", __func__);
|
|
local_irq_disable();
|
|
acpi_enter_sleep_state(ACPI_STATE_S5);
|
|
}
|
|
|
|
int __init acpi_sleep_init(void)
|
|
{
|
|
char supported[ACPI_S_STATE_COUNT * 3 + 1];
|
|
char *pos = supported;
|
|
int i;
|
|
|
|
acpi_sleep_dmi_check();
|
|
|
|
sleep_states[ACPI_STATE_S0] = 1;
|
|
|
|
acpi_sleep_syscore_init();
|
|
acpi_sleep_suspend_setup();
|
|
acpi_sleep_hibernate_setup();
|
|
|
|
if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
|
|
sleep_states[ACPI_STATE_S5] = 1;
|
|
pm_power_off_prepare = acpi_power_off_prepare;
|
|
pm_power_off = acpi_power_off;
|
|
} else {
|
|
acpi_no_s5 = true;
|
|
}
|
|
|
|
supported[0] = 0;
|
|
for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
|
|
if (sleep_states[i])
|
|
pos += sprintf(pos, " S%d", i);
|
|
}
|
|
pr_info(PREFIX "(supports%s)\n", supported);
|
|
|
|
/*
|
|
* Register the tts_notifier to reboot notifier list so that the _TTS
|
|
* object can also be evaluated when the system enters S5.
|
|
*/
|
|
register_reboot_notifier(&tts_notifier);
|
|
return 0;
|
|
}
|