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/linux/Documentation/admin-guide/pm/
H A Dsuspend-flows.rst1 .. SPDX-License-Identifier: GPL-2.0
5 System Suspend Code Flows
12 At least one global system-wide transition needs to be carried out for the
13 system to get from the working state into one of the supported
14 :doc:`sleep states <sleep-states>`. Hibernation requires more than one
15 transition to occur for this purpose, but the other sleep states, commonly
16 referred to as *system-wide suspend* (or simply *system suspend*) states, need
20 the target sleep state is referred to as *system suspend* too (in the majority
23 working state is referred to as *system resume*.
25 The kernel code flows associated with the suspend and resume transitions for
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H A Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
22 the Linux kernel can support up to four system sleep states, including
23 hibernation and up to three variants of system suspend. The sleep states that
28 Suspend-to-Idle section in Sleep States That Can Be Supported
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
32 referred to as S2I or S2Idle). It allows more energy to be saved relative to
33 runtime idle by freezing user space, suspending the timekeeping and putting all
34 I/O devices into low-power states (possibly lower-power than available in the
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/linux/Documentation/devicetree/bindings/cpu/
H A Didle-states.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/cpu/idle-states.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Idle states
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
11 - Anup Patel <anup@brainfault.org>
15 1 - Introduction
18 ARM and RISC-V systems contain HW capable of managing power consumption
19 dynamically, where cores can be put in different low-power states (ranging
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/linux/Documentation/driver-api/usb/
H A Dpower-management.rst1 .. _usb-power-management:
7 :Date: Last-updated: February 2014
11 ---------
14 * When is a USB device idle?
17 * Changing the default idle-delay time
31 -------------------------
35 component is ``suspended`` it is in a nonfunctional low-power state; it
37 ``resumed`` (returned to a functional full-power state) when the kernel
38 needs to use it. (There also are forms of PM in which components are
44 the system, we speak of it as a "system suspend". When a particular
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/linux/Documentation/devicetree/bindings/arm/
H A Dpsci.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
15 processors") can be used by Linux to initiate various CPU-centric power
18 Issue A of the specification describes functions for CPU suspend, hotplug
21 Functions are invoked by trapping to the privilege level of the PSCI
23 in a manner similar to that specified by AAPCS:
25 r0 => 32-bit Function ID / return value
26 {r1 - r3} => Parameters
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/linux/kernel/power/
H A Dsuspend.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * kernel/power/suspend.c - Suspend to RAM and standby functionality.
26 #include <linux/suspend.h>
66 * pm_suspend_default_s2idle - Check if suspend-to-idle is the default suspend.
68 * Return 'true' if suspend-to-idle has been selected as the default system
69 * suspend method.
100 * The s2idle_lock must be acquired before the pending wakeup check to in s2idle_enter()
112 /* Push all the CPUs into the idle loop. */ in s2idle_enter()
114 /* Make the current CPU wait so it can enter the idle loop too. */ in s2idle_enter()
119 * Kick all CPUs to ensure that they resume their timers and restore in s2idle_enter()
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/linux/Documentation/power/
H A Dsuspend-and-interrupts.rst2 System Suspend and Device Interrupts
10 -----------------------------------
13 suspend after the "late" phase of suspending devices (that is, after all of the
14 ->prepare, ->suspend and ->suspend_late callbacks have been executed for all
17 The rationale for doing so is that after the "late" phase of device suspend
19 trigger and if any devices have not been suspended properly yet, it is better to
23 In some cases they would attempt to access, for example, memory address spaces
24 of suspended devices and cause unpredictable behavior to ensue as a result.
25 Unfortunately, such problems are very difficult to debug and the introduction
26 of suspend_device_irqs(), along with the "noirq" phase of device suspend and
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H A Druntime_pm.rst5 (C) 2009-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
18 put their PM-related work items. It is strongly recommended that pm_wq be
19 used for queuing all work items related to runtime PM, because this allows
20 them to be synchronized with system-wide power transitions (suspend to RAM,
34 device drivers are encouraged to use these functions.
53 The ->runtime_suspend(), ->runtime_resume() and ->runtime_idle() callbacks
57 1. PM domain of the device, if the device's PM domain object, dev->pm_domain,
60 2. Device type of the device, if both dev->type and dev->type->pm are present.
62 3. Device class of the device, if both dev->class and dev->class->pm are
65 4. Bus type of the device, if both dev->bus and dev->bus->pm are present.
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/linux/Documentation/devicetree/bindings/mmc/
H A Dti-omap-hsmmc.txt10 --------------------
11 - compatible:
12 Should be "ti,omap2-hsmmc", for OMAP2 controllers
13 Should be "ti,omap3-hsmmc", for OMAP3 controllers
14 Should be "ti,omap3-pre-es3-hsmmc" for OMAP3 controllers pre ES3.0
15 Should be "ti,omap4-hsmmc", for OMAP4 controllers
16 Should be "ti,am33xx-hsmmc", for AM335x controllers
17 Should be "ti,k2g-hsmmc", "ti,omap4-hsmmc" for 66AK2G controllers.
20 ---------------------------------
22 - ti,hwmods: Must be "mmc<n>", n is controller instance starting 1.
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/linux/drivers/cpuidle/
H A Dcpuidle-psci.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * PSCI CPU idle driver.
30 #include "cpuidle-psci.h"
54 ds->pd = pd; in psci_set_domain_state()
55 ds->state_idx = state_idx; in psci_set_domain_state()
56 ds->state = state; in psci_set_domain_state()
69 u32 *states = data->psci_states; in __psci_enter_domain_idle_state()
70 struct device *pd_dev = data->dev; in __psci_enter_domain_idle_state()
77 return -1; in __psci_enter_domain_idle_state()
79 /* Do runtime PM to manage a hierarchical CPU toplogy. */ in __psci_enter_domain_idle_state()
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H A Dcpuidle-riscv-sbi.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * RISC-V SBI CPU idle driver.
9 #define pr_fmt(fmt) "cpuidle-riscv-sbi: " fmt
27 #include <asm/suspend.h>
52 data->available = true; in sbi_set_domain_state()
53 data->state = state; in sbi_set_domain_state()
60 return data->state; in sbi_get_domain_state()
67 data->available = false; in sbi_clear_domain_state()
74 return data->available; in sbi_is_domain_state_available()
95 u32 *states = data->states; in __sbi_enter_domain_idle_state()
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H A DKconfig.arm1 # SPDX-License-Identifier: GPL-2.0-only
3 # ARM CPU Idle drivers
6 bool "Generic ARM CPU idle Driver"
11 Select this to enable generic cpuidle driver for ARM.
12 It provides a generic idle driver whose idle states are configured
13 at run-time through DT nodes. The CPUidle suspend backend is
14 initialized by calling the CPU operations init idle hook
18 bool "PSCI CPU idle Driver"
23 Select this to enable PSCI firmware based CPUidle driver for ARM.
24 It provides an idle driver that is capable of detecting and
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/linux/arch/x86/kernel/
H A Dapm_32.c1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- linux-c -*-
4 * Copyright 1994-2001 Stephen Rothwell (sfr@canb.auug.org.au)
10 * Minor enhancements and updates (to the patch set) for 1.3.x
13 * Make /proc/apm easy to format (bump driver version)
16 * (Thanks to Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>)
43 * 1.1: support user-space standby and suspend, power off after system
46 * is only incorrect by 30-60mS (vs. 1S previously) (Gabor J. Toth
48 * screen-blanking and gpm (Stephen Rothwell); Linux 1.99.4
49 * 1.2a:Simple change to stop mysterious bug reports with SMP also added
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/linux/arch/powerpc/platforms/44x/
H A Dcpm.c1 // SPDX-License-Identifier: GPL-2.0-or-later
8 * Based on arch/powerpc/platforms/44x/idle.c:
16 * See file CREDITS for list of people who contributed to this
24 #include <linux/suspend.h>
26 #include <asm/dcr-native.h>
43 unsigned int suspend; member
64 * unconditionally put to sleep when the corresponding CPM bit is in cpm_set()
66 * put to sleep, they will. Here we do not verify, we just in cpm_set()
67 * set them and expect them to eventually go off when they can. in cpm_set()
72 /* return old state, to restore later if needed */ in cpm_set()
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/linux/kernel/sched/
H A Didle.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Generic entry points for the idle threads and
4 * implementation of the idle task scheduling class.
6 * (NOTE: these are not related to SCHED_IDLE batch scheduled
10 #include <linux/suspend.h>
19 * sched_idle_set_state - Record idle state for the current CPU.
20 * @idle_state: State to record.
34 cpu_idle_force_poll--; in cpu_idle_poll_ctrl()
109 * default_idle_call - Default CPU idle routine.
111 * To use when the cpuidle framework cannot be used.
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/linux/Documentation/devicetree/bindings/powerpc/4xx/
H A Dcpm.txt4 - compatible : compatible list, currently only "ibm,cpm"
5 - dcr-access-method : "native"
6 - dcr-reg : < DCR register range >
9 - er-offset : All 4xx SoCs with a CPM controller have
15 er-offset = <1>.
16 - unused-units : specifier consist of one cell. For each
18 in CPM will be set to turn off unused
20 - idle-doze : specifier consist of one cell. For each
22 in CPM will be set to turn off unused
24 - standby : specifier consist of one cell. For each
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/linux/Documentation/devicetree/bindings/regulator/
H A Drohm,bd71828-regulator.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/regulator/rohm,bd71828-regulator.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Matti Vaittinen <mazziesaccount@gmail.com>
14 see Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml.
16 The regulator controller is represented as a sub-node of the PMIC node
19 Regulator nodes should be named to BUCK_<number> and LDO_<number>.
25 "^LDO[1-7]$":
32 regulator-name:
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/linux/include/linux/mfd/
H A Drohm-generic.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
40 * struct rohm_dvs_config - dynamic voltage scaling register descriptions
42 * @level_map: bitmap representing supported run-levels for this
47 * @idle_reg: register address for regulator config at 'idle' state
48 * @idle_mask: value mask for regulator voltages at 'idle' state
49 * @idle_on_mask: enable mask for regulator at 'idle' state
50 * @suspend_reg: register address for regulator config at 'suspend' state
51 * @suspend_mask: value mask for regulator voltages at 'suspend' state
52 * @suspend_on_mask: enable mask for regulator at 'suspend' state
58 * system states. This is used to correctly configure the PMIC at startup
/linux/include/linux/
H A Dpm_runtime.h1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * pm_runtime.h - Device run-time power management helper functions.
27 * Use this for defining a set of PM operations to be used in all situations
28 * (system suspend, hibernation or runtime PM).
35 * If the underlying dev_pm_ops struct symbol has to be exported, use
103 * pm_suspend_ignore_children - Set runtime PM behavior regarding children.
105 * @enable: Whether or not to ignore possible dependencies on children.
113 dev->power.ignore_children = enable; in pm_suspend_ignore_children()
117 * pm_runtime_get_noresume - Bump up runtime PM usage counter of a device.
122 atomic_inc(&dev->power.usage_count); in pm_runtime_get_noresume()
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/linux/drivers/firmware/psci/
H A Dpsci_checker.c1 // SPDX-License-Identifier: GPL-2.0-only
31 static int tos_resident_cpu = -1;
42 * "enable-method" property of each CPU in the DT, but given that there is no
43 * arch-specific way to check this, we assume that the DT is sensible.
47 int migrate_type = -1; in psci_ops_check()
52 return -EOPNOTSUPP; in psci_ops_check()
66 if (tos_resident_cpu == -1) in psci_ops_check()
85 /* Try to power down all CPUs in the mask. */ in down_and_up_cpus()
94 if (ret != -EBUSY) { in down_and_up_cpus()
96 "to power down last online CPU %d\n", in down_and_up_cpus()
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/linux/drivers/base/power/
H A Druntime.c1 // SPDX-License-Identifier: GPL-2.0
3 * drivers/base/power/runtime.c - Helper functions for device runtime PM
30 if (dev->driver && dev->driver->pm) in __rpm_get_driver_callback()
31 return get_callback_ptr(dev->driver->pm, cb_offset); in __rpm_get_driver_callback()
41 if (dev->pm_domain) in __rpm_get_callback()
42 ops = &dev->pm_domain->ops; in __rpm_get_callback()
43 else if (dev->type && dev->type->pm) in __rpm_get_callback()
44 ops = dev->type->pm; in __rpm_get_callback()
45 else if (dev->class && dev->class->pm) in __rpm_get_callback()
46 ops = dev->class->pm; in __rpm_get_callback()
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/linux/arch/arm/include/asm/
H A Dfirmware.h1 /* SPDX-License-Identifier: GPL-2.0-only */
16 * A structure to specify available firmware operations.
22 * Inform the firmware we intend to enter CPU idle mode
26 * Enters CPU idle mode
46 * Enter system-wide suspend.
48 int (*suspend)(void); member
50 * Restore state of privileged hardware after system-wide suspend.
62 * otherwise returns -ENOSYS
65 ((firmware_ops->op) ? firmware_ops->op(__VA_ARGS__) : (-ENOSYS))
70 * A function to register platform firmware_ops struct.
/linux/drivers/pmdomain/
H A Dgovernor.c1 // SPDX-License-Identifier: GPL-2.0
3 * drivers/base/power/domain_governor.c - Governors for device PM domains.
21 if (dev->power.subsys_data && dev->power.subsys_data->domain_data) { in dev_update_qos_constraint()
22 struct gpd_timing_data *td = dev_gpd_data(dev)->td; in dev_update_qos_constraint()
25 * Only take suspend-time QoS constraints of devices into in dev_update_qos_constraint()
27 * been suspended are not guaranteed to be taken into account in dev_update_qos_constraint()
28 * anyway. In order for them to take effect, the device has to in dev_update_qos_constraint()
31 constraint_ns = td ? td->effective_constraint_ns : in dev_update_qos_constraint()
36 * suspend/resume latencies, so assume them to be negligible and in dev_update_qos_constraint()
51 * default_suspend_ok - Default PM domain governor routine to suspend devices.
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/linux/arch/arm/kernel/
H A Dcpuidle.c1 // SPDX-License-Identifier: GPL-2.0-or-later
18 * arm_cpuidle_simple_enter() - a wrapper to cpu_do_idle()
23 * A trivial wrapper to allow the cpu_do_idle function to be assigned as a
37 * arm_cpuidle_suspend() - function to enter low power idle states
43 * Returns the result of the suspend callback.
49 return cpuidle_ops[cpu].suspend(index); in arm_cpuidle_suspend()
53 * arm_cpuidle_get_ops() - find a registered cpuidle_ops by name
65 for (; m->method; m++) in arm_cpuidle_get_ops()
66 if (!strcmp(m->method, method)) in arm_cpuidle_get_ops()
67 return m->ops; in arm_cpuidle_get_ops()
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/linux/arch/arm/mach-pxa/
H A Dpxa27x.h1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/suspend.h>
6 #include "addr-map.h"
7 #include "pxa2xx-regs.h"
8 #include "mfp-pxa27x.h"
13 #define ARB_DMA_SLV_PARK (1<<31) /* Be parked with DMA slave when idle */
14 #define ARB_CI_PARK (1<<30) /* Be parked with Camera Interface when idle */
15 #define ARB_EX_MEM_PARK (1<<29) /* Be parked with external MEMC when idle */
16 #define ARB_INT_MEM_PARK (1<<28) /* Be parked with internal MEMC when idle */
17 #define ARB_USB_PARK (1<<27) /* Be parked with USB when idle */
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