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/Documentation/sound/designs/
Dpowersave.rst2 Notes on Power-Saving Mode
5 AC97 and HD-audio drivers have the automatic power-saving mode.
9 With the automatic power-saving, the driver turns off the codec power
11 the device and/or no analog loopback is set, the power disablement is
12 done fully or partially. It'll save a certain power consumption, thus
15 The time-out for automatic power-off can be specified via ``power_save``
16 module option of snd-ac97-codec and snd-hda-intel modules. Specify
17 the time-out value in seconds. 0 means to disable the automatic
18 power-saving. The default value of timeout is given via
27 automatic power-save mode with 10 seconds, write to
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/Documentation/devicetree/bindings/powerpc/4xx/
Dcpm.txt1 PPC4xx Clock Power Management (CPM) node
4 - 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
20 - idle-doze : specifier consist of one cell. For each
24 - standby : specifier consist of one cell. For each
28 - suspend : specifier consist of one cell. For each
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/Documentation/devicetree/bindings/gpio/
Dgpio-consumer-common.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Bartosz Golaszewski <brgl@bgdev.pl>
11 - Linus Walleij <linus.walleij@linaro.org>
20 enable-gpios:
25 reset-gpios:
27 GPIO (or GPIOs for power sequence) connected to the device reset pin
30 powerdown-gpios:
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/Documentation/devicetree/bindings/display/mediatek/
Dmediatek,aal.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Chun-Kuang Hu <chunkuang.hu@kernel.org>
11 - Philipp Zabel <p.zabel@pengutronix.de>
15 is responsible for backlight power saving and sunlight visibility improving.
24 - enum:
25 - mediatek,mt8173-disp-aal
26 - mediatek,mt8183-disp-aal
27 - mediatek,mt8195-mdp3-aal
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/Documentation/sound/soc/
Doverview.rst6 provide better ALSA support for embedded system-on-chip processors (e.g.
9 had some limitations:-
12 CPU. This is not ideal and leads to code duplication - for example,
18 machine specific code to re-route audio, enable amps, etc., after such an
21 * Drivers tended to power up the entire codec when playing (or
23 power on portable devices. There was also no support for saving
24 power via changing codec oversampling rates, bias currents, etc.
31 features :-
41 * Dynamic Audio Power Management (DAPM). DAPM automatically sets the codec to
42 its minimum power state at all times. This includes powering up/down
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/Documentation/devicetree/bindings/regulator/
Drichtek,rt6190.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Richtek RT6190 4-Switch BuckBoost controller
10 - ChiYuan Huang <cy_huang@richtek.com>
13 The RT6190 is 4-Switch BuckBoost controller designed for converting input
18 power delivery product.
21 https://www.richtek.com/assets/product_file/RT6190/DS6190-02.pdf
24 - $ref: regulator.yaml#
29 - richtek,rt6190
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Drichtek,rtq2208.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Alina Yu <alina_yu@richtek.com>
13 RTQ2208 is a highly integrated power converter that offers functional safety dual
14 multi-configurable synchronous buck converters and two LDOs.
16 Bucks support "regulator-allowed-modes" and "regulator-mode". The former defines the permitted
20 operation modes for all buck rails, automatic power saving mode (Auto mode) and forced continuous
25 0 - Auto mode for power saving, which reducing the switching frequency at light load condition
27 …1 - FCCM to meet the strict voltage regulation accuracy, which keeping constant switching frequenc…
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/Documentation/ABI/testing/
Dsysfs-platform-eeepc-laptop8 - 1 = LCD
9 - 2 = CRT
10 - 3 = LCD+CRT
36 * 0 -> Super Performance Mode
37 * 1 -> High Performance Mode
38 * 2 -> Power Saving Mode
46 | `---- Current mode
47 `------------ Availables modes
Dsysfs-platform-asus-wmi6 Change CPU clock configuration (write-only).
9 * 0 -> Super Performance Mode
10 * 1 -> High Performance Mode
11 * 2 -> Power Saving Mode
47 * 0 - normal,
48 * 1 - overboost,
49 * 2 - silent
57 * 0 - default,
58 * 1 - overboost,
59 * 2 - silent
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/Documentation/sound/hd-audio/
Dnotes.rst2 More Notes on HD-Audio Driver
11 HD-audio is the new standard on-board audio component on modern PCs
12 after AC97. Although Linux has been supporting HD-audio since long
15 This document explains the brief trouble-shooting and debugging
16 methods for the HD-audio hardware.
18 The HD-audio component consists of two parts: the controller chip and
19 the codec chips on the HD-audio bus. Linux provides a single driver
20 for all controllers, snd-hda-intel. Although the driver name contains
21 a word of a well-known hardware vendor, it's not specific to it but for
22 all controller chips by other companies. Since the HD-audio
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Dcontrols.rst2 HD-Audio Codec-Specific Mixer Controls
6 This file explains the codec-specific mixer controls.
9 --------------
12 This is an enum control to change the surround-channel setup,
16 jack-retasking of multi-I/O jacks.
18 Auto-Mute Mode
19 This is an enum control to change the auto-mute behavior of the
20 headphone and line-out jacks. If built-in speakers and headphone
21 and/or line-out jacks are available on a machine, this controls
23 When there are only either headphones or line-out jacks, it gives
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/Documentation/devicetree/bindings/power/
Dpower_domain.txt4 used for power gating of selected IP blocks for power saving by reduced leakage
12 #power-domain-cells property in the PM domain provider node.
16 See power-domain.yaml.
21 - power-domains : A list of PM domain specifiers, as defined by bindings of
22 the power controller that is the PM domain provider.
25 - power-domain-names : A list of power domain name strings sorted in the same
26 order as the power-domains property. Consumers drivers will use
27 power-domain-names to match power domains with power-domains
32 leaky-device@12350000 {
33 compatible = "foo,i-leak-current";
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Dpower-domain.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/power-domain.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rafael J. Wysocki <rjw@rjwysocki.net>
11 - Kevin Hilman <khilman@kernel.org>
12 - Ulf Hansson <ulf.hansson@linaro.org>
16 used for power gating of selected IP blocks for power saving by reduced
25 \#power-domain-cells property in the PM domain provider node.
29 pattern: "^(power-controller|power-domain|performance-domain)([@-].*)?$"
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/Documentation/gpu/
Dpanfrost.rst1 .. SPDX-License-Identifier: GPL-2.0+
7 .. _panfrost-usage-stats:
13 documented in :ref:`drm-client-usage-stats`.
23 drm-driver: panfrost
24 drm-client-id: 14
25 drm-engine-fragment: 1846584880 ns
26 drm-cycles-fragment: 1424359409
27 drm-maxfreq-fragment: 799999987 Hz
28 drm-curfreq-fragment: 799999987 Hz
29 drm-engine-vertex-tiler: 71932239 ns
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/Documentation/devicetree/bindings/clock/
Dimx7ulp-scg-clock.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/clock/imx7ulp-scg-clock.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - A.s. Dong <aisheng.dong@nxp.com>
32 source selection for peripheral clocks and control of power saving
37 See include/dt-bindings/clock/imx7ulp-clock.h for the full list of
42 const: fsl,imx7ulp-scg1
47 '#clock-cells':
52 - description: rtc osc
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/Documentation/hwmon/
Dsht15.rst35 http://www.sensirion.ch/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf
38 -----------
50 sensors. Disabling the reload of those coefficients allows saving 10ms for each
51 measurement and decrease power consumption, while losing on precision.
62 -------------
72 ---------------
77 heater_enable write 1 in this attribute to enable the on-chip heater,
Dadt7410.rst14 https://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf
23 https://www.analog.com/static/imported-files/data_sheets/ADT7420.pdf
33 https://www.analog.com/static/imported-files/data_sheets/ADT7310.pdf
43 https://www.analog.com/static/imported-files/data_sheets/ADT7320.pdf
48 -----------
51 -55°C to +150°C. It has a high accuracy of +/-0.5°C and can be operated at a
56 common hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events.
57 Both pins can individually set to be active-low or active-high, while the whole
60 second or even just get one sample on demand for power saving. Besides, it can
61 completely power down its ADC, if power management is required.
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/Documentation/power/
Duserland-swsusp.rst93 resume_swap_area, as defined in kernel/power/suspend_ioctls.h,
96 swap files (see Documentation/power/swsusp-and-swap-files.rst for
109 immediately enter the suspend-to-RAM state, so this call must always
112 is needed to implement the suspend-to-both mechanism in which the
115 to resume the system from RAM if there's enough battery power or restore
121 - you cannot read() more than one virtual memory page at a time
122 - read()s across page boundaries are impossible (ie. if you read() 1/2 of
156 SNAPSHOT_ATOMIC_RESTORE will not succeed. Still, this is not a fool-proof
168 created and the system is ready for saving it):
182 use it for saving the image).
Dswsusp.rst32 power states like "standby", which normally don't turn USB off.)
36 line or specify it using /sys/power/resume.
41 in /sys/power/resume_offset.
45 echo shutdown > /sys/power/disk; echo disk > /sys/power/state
47 - If you feel ACPI works pretty well on your system, you might try::
49 echo platform > /sys/power/disk; echo disk > /sys/power/state
51 - If you would like to write hibernation image to swap and then suspend
54 echo suspend > /sys/power/disk; echo disk > /sys/power/state
56 - If you have SATA disks, you'll need recent kernels with SATA suspend
58 are built into kernel -- not modules. [There's way to make
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/Documentation/admin-guide/pm/
Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
38 The system is woken up from this state by in-band interrupts, so theoretically
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
50 -------
54 operating state is lost (the system core logic retains power), so the system can
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/Documentation/arch/powerpc/
Dfirmware-assisted-dump.rst2 Firmware-Assisted Dump
7 The goal of firmware-assisted dump is to enable the dump of
8 a crashed system, and to do so from a fully-reset system, and
12 - Firmware-Assisted Dump (FADump) infrastructure is intended to replace
14 - Fadump uses the same firmware interfaces and memory reservation model
16 - Unlike phyp dump, FADump exports the memory dump through /proc/vmcore
19 - Unlike phyp dump, userspace tool does not need to refer any sysfs
21 - Unlike phyp dump, FADump allows user to release all the memory reserved
23 - Once enabled through kernel boot parameter, FADump can be
28 Comparing with kdump or other strategies, firmware-assisted
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/Documentation/devicetree/bindings/net/
Dqca,ar803x.yaml1 # SPDX-License-Identifier: GPL-2.0+
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andrew Lunn <andrew@lunn.ch>
11 - Florian Fainelli <f.fainelli@gmail.com>
12 - Heiner Kallweit <hkallweit1@gmail.com>
18 - $ref: ethernet-phy.yaml#
21 qca,clk-out-frequency:
26 qca,clk-out-strength:
31 qca,disable-smarteee:
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/Documentation/devicetree/bindings/net/wireless/
Dsilabs,wfx.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Jérôme Pouiller <jerome.pouiller@silabs.com>
16 https://www.silabs.com/documents/public/data-sheets/wf200-datasheet.pdf
25 It is recommended to declare a mmc-pwrseq on SDIO host above WFx. Without
26 it, you may encounter issues during reboot. The mmc-pwrseq should be
27 compatible with mmc-pwrseq-simple. Please consult
28 Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml for more
34 - enum:
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/Documentation/gpu/amdgpu/display/
Ddcn-overview.rst10 .. kernel-figure:: dc_pipeline_overview.svg
19 * **Display Pipe and Plane (DPP)**: This block provides pre-blend pixel
24 multiple planes, using global or per-pixel alpha.
38 * **Multi-Media HUB (MMHUBBUB)**: Memory controller interface for DMCUB and DWB
43 the Display Micro-Controller Unit - version B (DMCUB), which is handled via
84 ----------------------
100 a one-to-one mapping of the link encoder to PHY, but we can configure the DCN
106 ---------
114 representation and convert them to a DCN specific floating-point format (i.e.,
115 different from the IEEE floating-point format). In the process, CNVC also
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/Documentation/devicetree/bindings/soc/qcom/
Dqcom,rpmh-rsc.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/soc/qcom/qcom,rpmh-rsc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Bjorn Andersson <bjorn.andersson@linaro.org>
13 Resource Power Manager Hardened (RPMH) is the mechanism for communicating
26 have powered off to facilitate idle power saving. TCS could be classified as::
27 ACTIVE - Triggered by Linux
28 SLEEP - Triggered by F/W
29 WAKE - Triggered by F/W
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