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/Linux-v5.4/Documentation/driver-api/usb/
Dpower-management.rst1 .. _usb-power-management:
7 :Date: Last-updated: February 2014
11 ---------
17 * Changing the default idle-delay time
20 * The driver interface for autosuspend and autoresume
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
67 ----------------------
85 --------------------------
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/Linux-v5.4/drivers/gpu/drm/i915/
DKconfig.profile2 int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
9 that complements the runtime-pm autosuspend and provides a lower
10 floor on the autosuspend delay.
12 May be 0 to disable the extra delay and solely use the device level
13 runtime pm autosuspend delay tunable.
21 take a non-negligible time to setup, we do a short spin first to
Dintel_wakeref.h2 * SPDX-License-Identifier: MIT
72 * Note that @fn is allowed to fail, in which case the runtime-pm wakeref
81 if (unlikely(!atomic_inc_not_zero(&wf->count))) in intel_wakeref_get()
99 return atomic_inc_not_zero(&wf->count); in intel_wakeref_get_if_active()
112 * Note that @fn is allowed to fail, in which case the runtime-pm wakeref
121 INTEL_WAKEREF_BUG_ON(atomic_read(&wf->count) <= 0); in intel_wakeref_put()
122 if (unlikely(!atomic_add_unless(&wf->count, -1, 1))) in intel_wakeref_put()
136 __acquires(wf->mutex) in intel_wakeref_lock()
138 mutex_lock(&wf->mutex); in intel_wakeref_lock()
149 __releases(wf->mutex) in intel_wakeref_unlock()
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Dintel_runtime_pm.h1 /* SPDX-License-Identifier: MIT */
37 * Our driver uses the autosuspend delay feature, which means we'll only really
52 struct device *kdev; /* points to i915->drm.pdev->dev */
81 #define INTEL_RPM_RAW_WAKEREF_MASK (INTEL_RPM_WAKELOCK_BIAS - 1)
98 WARN_ONCE(rpm->suspended, in assert_rpm_device_not_suspended()
107 "RPM raw-wakeref not held\n"); in __assert_rpm_raw_wakeref_held()
121 __assert_rpm_raw_wakeref_held(rpm, atomic_read(&rpm->wakeref_count)); in assert_rpm_raw_wakeref_held()
127 __assert_rpm_wakelock_held(rpm, atomic_read(&rpm->wakeref_count)); in assert_rpm_wakelock_held()
131 * disable_rpm_wakeref_asserts - disable the RPM assert checks
135 * reference, while keeping the device-not-suspended checks still enabled.
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/Linux-v5.4/Documentation/power/
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
20 them to be synchronized with system-wide power transitions (suspend to RAM,
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.
69 dev->driver->pm directly (if present).
73 and bus type. Moreover, the high-priority one will always take precedence over
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/Linux-v5.4/Documentation/devicetree/bindings/net/nfc/
Dtrf7970a.txt4 - compatible: Should be "ti,trf7970a".
5 - spi-max-frequency: Maximum SPI frequency (<= 2000000).
6 - interrupts: A single interrupt specifier.
7 - ti,enable-gpios: One or two GPIO entries used for 'EN' and 'EN2' pins on the
9 - vin-supply: Regulator for supply voltage to VIN pin
12 - pinctrl-names: Contains only one value - "default".
13 - pintctrl-0: Specifies the pin control groups used for this controller.
14 - autosuspend-delay: Specify autosuspend delay in milliseconds.
15 - irq-status-read-quirk: Specify that the trf7970a being used has the
17 - en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF"
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/Linux-v5.4/drivers/usb/core/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
30 Documentation/driver-api/usb/persist.rst for more info.
50 "Dual-Role" device, which can act as either a device
55 Select this only if your board has Mini-AB/Micro-AB
83 Implements OTG Finite State Machine as specified in On-The-Go
95 int "Default autosuspend delay"
99 The default autosuspend delay in seconds. Can be overridden
100 with the usbcore.autosuspend command line or module parameter.
103 this value if you want a different delay and cannot modify
Dhub.c1 // SPDX-License-Identifier: GPL-2.0
45 /* Protect struct usb_device->state and ->children members
46 * Note: Both are also protected by ->dev.sem, except that ->state can
54 /* synchronize hub-port add/remove and peering operations */
64 * 10 seconds to send reply for the initial 64-byte descriptor request.
66 /* define initial 64-byte descriptor request timeout in milliseconds */
70 "initial 64-byte descriptor request timeout in milliseconds "
71 "(default 5000 - 5.0 seconds)");
116 if (hub_is_superspeedplus(hub->hdev)) in portspeed()
118 if (hub_is_superspeed(hub->hdev)) in portspeed()
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Dusb.c1 // SPDX-License-Identifier: GPL-2.0
6 * (C) Copyright Johannes Erdfelt 1999-2001
11 * (C) Copyright David Brownell 2000-2004
14 * (C) Copyright Greg Kroah-Hartman 2002-2003
47 #include <linux/dma-mapping.h>
67 /* Default delay value, in seconds */
69 module_param_named(autosuspend, usb_autosuspend_delay, int, 0644);
70 MODULE_PARM_DESC(autosuspend, "default autosuspend delay");
120 * usb_find_common_endpoints() -- look up common endpoint descriptors
127 * Search the alternate setting's endpoint descriptors for the first bulk-in,
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/Linux-v5.4/Documentation/ABI/stable/
Dsysfs-bus-usb8 not the "USB-Persist" facility is enabled for the device. For
12 For more information, see Documentation/driver-api/usb/persist.rst.
14 What: /sys/bus/usb/devices/.../power/autosuspend
20 power/autosuspend. This file holds the time (in seconds)
27 The autosuspend delay for newly-created devices is set to
28 the value of the usbcore.autosuspend module parameter.
37 connected to the machine. This file is read-only.
49 active, i.e. not in a suspended state. This file is read-only.
61 What: /sys/bus/usb/devices/<busnum>-<port[.port]>...:<config num>-<interface num>/supports_autosus…
67 for this interface supports autosuspend. It also
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/Linux-v5.4/block/
Dblk-pm.c1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/blk-mq.h>
4 #include <linux/blk-pm.h>
7 #include "blk-mq.h"
8 #include "blk-mq-tag.h"
11 * blk_pm_runtime_init - Block layer runtime PM initialization routine
16 * Initialize runtime-PM-related fields for @q and start auto suspend for
17 * @dev. Drivers that want to take advantage of request-based runtime PM
24 * the autosuspend delay is set to -1 to make runtime suspend impossible
26 * not need to touch other autosuspend settings.
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/Linux-v5.4/drivers/base/power/
Druntime.c1 // SPDX-License-Identifier: GPL-2.0
3 * drivers/base/power/runtime.c - Helper functions for device runtime PM
26 if (dev->pm_domain) in __rpm_get_callback()
27 ops = &dev->pm_domain->ops; in __rpm_get_callback()
28 else if (dev->type && dev->type->pm) in __rpm_get_callback()
29 ops = dev->type->pm; in __rpm_get_callback()
30 else if (dev->class && dev->class->pm) in __rpm_get_callback()
31 ops = dev->class->pm; in __rpm_get_callback()
32 else if (dev->bus && dev->bus->pm) in __rpm_get_callback()
33 ops = dev->bus->pm; in __rpm_get_callback()
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/Linux-v5.4/Documentation/ABI/testing/
Dsysfs-devices-power40 space to control the run-time power management of the device.
61 with the main suspend/resume thread) during system-wide power
86 attribute is read-only. If the device is not capable to wake up
98 is read-only. If the device is not capable to wake up the
110 state in progress. This attribute is read-only. If the device
122 read-only. If the device is not capable to wake up the system
133 the device is being processed (1). This attribute is read-only.
145 device, in milliseconds. This attribute is read-only. If the
156 with the device, in milliseconds. This attribute is read-only.
169 milliseconds. This attribute is read-only. If the device is
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/Linux-v5.4/Documentation/devicetree/bindings/spi/
Dspi-pl022.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/spi/spi-pl022.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
13 - $ref: "spi-controller.yaml#"
22 - compatible
27 - const: arm,pl022
28 - const: arm,primecell
39 clock-names:
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/Linux-v5.4/drivers/iio/adc/
Dsun4i-gpadc-iio.c1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>
15 * This is also the reason of using autosuspend in pm_runtime. If there was no
16 * autosuspend, the thermal sensor would need X seconds after every
17 * pm_runtime_get_sync to get a value from the ADC. The autosuspend allows the
32 #include <linux/delay.h>
37 #include <linux/mfd/sun4i-gpadc.h>
59 .temp_offset = -1932,
68 .temp_offset = -1447,
77 .temp_offset = -1623,
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/Linux-v5.4/drivers/iio/accel/
Dkxsd9.c1 // SPDX-License-Identifier: GPL-2.0-only
6 * Copyright (c) 2008-2009 Jonathan Cameron <jic23@kernel.org>
21 #include <linux/delay.h>
60 #define KXSD9_CTRL_B_ST BIT(5) /* Self-test */
65 * struct kxsd9_state - device related storage
88 #define KXSD9_ZERO_G_OFFSET -2048
108 return -EINVAL; in kxsd9_write_scale()
110 ret = regmap_update_bits(st->map, in kxsd9_write_scale()
118 st->scale = i; in kxsd9_write_scale()
141 int ret = -EINVAL; in kxsd9_write_raw()
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/Linux-v5.4/drivers/char/hw_random/
Dmtk-rng.c1 // SPDX-License-Identifier: GPL-2.0-or-later
10 #include <linux/delay.h>
21 /* Runtime PM autosuspend timeout: */
47 err = clk_prepare_enable(priv->clk); in mtk_rng_init()
51 val = readl(priv->base + RNG_CTRL); in mtk_rng_init()
53 writel(val, priv->base + RNG_CTRL); in mtk_rng_init()
63 val = readl(priv->base + RNG_CTRL); in mtk_rng_cleanup()
65 writel(val, priv->base + RNG_CTRL); in mtk_rng_cleanup()
67 clk_disable_unprepare(priv->clk); in mtk_rng_cleanup()
75 ready = readl(priv->base + RNG_CTRL) & RNG_READY; in mtk_rng_wait_ready()
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/Linux-v5.4/drivers/net/wimax/i2400m/
Dusb.c1 // SPDX-License-Identifier: GPL-2.0-only
6 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
7 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
10 * See i2400m-usb.h for a general description of this driver.
13 * generic driver to implement the bus-specific functions (device
51 #include "i2400m-usb.h"
59 #include "usb-debug-levels.h"
65 "String of space-separated NAME:VALUE pairs, where NAMEs "
71 #define I2400MU_FW_FILE_NAME_v1_5 "i2400m-fw-usb-1.5.sbcf"
73 #define I2400MU_FW_FILE_NAME_v1_4 "i2400m-fw-usb-1.4.sbcf"
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/Linux-v5.4/drivers/iio/light/
Dbh1780.c1 // SPDX-License-Identifier: GPL-2.0-only
14 #include <linux/delay.h>
45 int ret = i2c_smbus_write_byte_data(bh1780->client, in bh1780_write()
49 dev_err(&bh1780->client->dev, in bh1780_write()
58 int ret = i2c_smbus_read_byte_data(bh1780->client, in bh1780_read()
61 dev_err(&bh1780->client->dev, in bh1780_read()
70 int ret = i2c_smbus_read_word_data(bh1780->client, in bh1780_read_word()
73 dev_err(&bh1780->client->dev, in bh1780_read_word()
108 switch (chan->type) { in bh1780_read_raw()
110 pm_runtime_get_sync(&bh1780->client->dev); in bh1780_read_raw()
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/Linux-v5.4/drivers/misc/mei/
Dclient.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2003-2019, Intel Corporation. All rights reserved.
9 #include <linux/delay.h>
20 * mei_me_cl_init - initialize me client
26 INIT_LIST_HEAD(&me_cl->list); in mei_me_cl_init()
27 kref_init(&me_cl->refcnt); in mei_me_cl_init()
31 * mei_me_cl_get - increases me client refcount
35 * Locking: called under "dev->device_lock" lock
41 if (me_cl && kref_get_unless_zero(&me_cl->refcnt)) in mei_me_cl_get()
48 * mei_me_cl_release - free me client
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/Linux-v5.4/sound/soc/intel/common/
Dsst-dsp.h1 /* SPDX-License-Identifier: GPL-2.0-only */
23 /* autosuspend delay 5s*/
37 #define SST_IPCX 0x38 /* IPC IA -> SST */
38 #define SST_IPCD 0x40 /* IPC SST -> IA */
199 int resindex_dma_base; /* other fields invalid if equals to -1 */
241 /* Internal generic low-level SST IO functions - can be overidden */
/Linux-v5.4/drivers/gpu/drm/
Ddrm_probe_helper.c2 * Copyright (c) 2006-2008 Intel Corporation
56 * track of a per-connector hpd interrupt.
73 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && in drm_mode_validate_flag()
77 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && in drm_mode_validate_flag()
81 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && in drm_mode_validate_flag()
92 struct drm_device *dev = connector->dev; in drm_mode_validate_pipeline()
115 ret = drm_bridge_mode_valid(encoder->bridge, mode); in drm_mode_validate_pipeline()
144 cmdline_mode = &connector->cmdline_mode; in drm_helper_probe_add_cmdline_mode()
145 if (!cmdline_mode->specified) in drm_helper_probe_add_cmdline_mode()
149 list_for_each_entry(mode, &connector->probed_modes, head) { in drm_helper_probe_add_cmdline_mode()
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/Linux-v5.4/drivers/iio/gyro/
Dmpu3050-core.c1 // SPDX-License-Identifier: GPL-2.0-only
17 #include <linux/delay.h>
37 * Register map: anything suffixed *_H is a big-endian high byte and always
74 /* Bits 8-11 select memory bank */
161 * Fullscale precision is (for finest precision) +/- 250 deg/s, so the full
182 if (mpu3050->lpf == MPU3050_DLPF_CFG_256HZ_NOLPF2) in mpu3050_get_freq()
186 freq /= (mpu3050->divisor + 1); in mpu3050_get_freq()
198 ret = regmap_update_bits(mpu3050->map, MPU3050_PWR_MGM, in mpu3050_start_sampling()
203 /* Turn on the Z-axis PLL */ in mpu3050_start_sampling()
204 ret = regmap_update_bits(mpu3050->map, MPU3050_PWR_MGM, in mpu3050_start_sampling()
[all …]
/Linux-v5.4/drivers/i2c/busses/
Di2c-sprd.c4 * SPDX-License-Identifier: (GPL-2.0+ OR MIT)
8 #include <linux/delay.h>
73 /* timeout (ms) for pm runtime autosuspend */
94 writel(count, i2c_dev->base + I2C_COUNT); in sprd_i2c_set_count()
99 u32 tmp = readl(i2c_dev->base + I2C_CTL); in sprd_i2c_send_stop()
102 writel(tmp & ~STP_EN, i2c_dev->base + I2C_CTL); in sprd_i2c_send_stop()
104 writel(tmp | STP_EN, i2c_dev->base + I2C_CTL); in sprd_i2c_send_stop()
109 u32 tmp = readl(i2c_dev->base + I2C_CTL); in sprd_i2c_clear_start()
111 writel(tmp & ~I2C_START, i2c_dev->base + I2C_CTL); in sprd_i2c_clear_start()
116 u32 tmp = readl(i2c_dev->base + I2C_STATUS); in sprd_i2c_clear_ack()
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/Linux-v5.4/drivers/iio/magnetometer/
Dak8974.c1 // SPDX-License-Identifier: GPL-2.0-only
7 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
22 #include <linux/delay.h>
37 * 16-bit registers are little-endian. LSB is at the address defined below
66 /* AK8974-specific offsets */
70 /* AMI305-specific offsets */
79 /* AMI306-specific control register */
94 /* axis cross-interference */
111 #define AK8974_INT_X_LOW BIT(4) /* Axis below -threshold */
153 * Set the autosuspend to two orders of magnitude larger than the poweron
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