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Merge tag 'asoc-fix-v4.8-rc4' of git://git.kernel.org/pub/scm/linux/k…
…ernel/git/broonie/sound into for-linus ASoC: Fixes for v4.8 A clutch of fixes for v4.8. These are mainly driver specific, the most notable ones being those for OMAP which fix a series of issues that broke boot on some platforms there when deferred probe kicked in. There's also one core fix for an issue when unbinding a card which for some reason had managed to not manifest until recently.
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Power Management Interface | ||
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The power management subsystem provides a unified sysfs interface to | ||
userspace, regardless of what architecture or platform one is | ||
running. The interface exists in /sys/power/ directory (assuming sysfs | ||
is mounted at /sys). | ||
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/sys/power/state controls system power state. Reading from this file | ||
returns what states are supported, which is hard-coded to 'freeze', | ||
'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and 'disk' | ||
(Suspend-to-Disk). | ||
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Writing to this file one of those strings causes the system to | ||
transition into that state. Please see the file | ||
Documentation/power/states.txt for a description of each of those | ||
states. | ||
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/sys/power/disk controls the operating mode of the suspend-to-disk | ||
mechanism. Suspend-to-disk can be handled in several ways. We have a | ||
few options for putting the system to sleep - using the platform driver | ||
(e.g. ACPI or other suspend_ops), powering off the system or rebooting the | ||
system (for testing). | ||
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Additionally, /sys/power/disk can be used to turn on one of the two testing | ||
modes of the suspend-to-disk mechanism: 'testproc' or 'test'. If the | ||
suspend-to-disk mechanism is in the 'testproc' mode, writing 'disk' to | ||
/sys/power/state will cause the kernel to disable nonboot CPUs and freeze | ||
tasks, wait for 5 seconds, unfreeze tasks and enable nonboot CPUs. If it is | ||
in the 'test' mode, writing 'disk' to /sys/power/state will cause the kernel | ||
to disable nonboot CPUs and freeze tasks, shrink memory, suspend devices, wait | ||
for 5 seconds, resume devices, unfreeze tasks and enable nonboot CPUs. Then, | ||
we are able to look in the log messages and work out, for example, which code | ||
is being slow and which device drivers are misbehaving. | ||
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Reading from this file will display all supported modes and the currently | ||
selected one in brackets, for example | ||
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[shutdown] reboot test testproc | ||
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Writing to this file will accept one of | ||
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'platform' (only if the platform supports it) | ||
'shutdown' | ||
'reboot' | ||
'testproc' | ||
'test' | ||
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/sys/power/image_size controls the size of the image created by | ||
the suspend-to-disk mechanism. It can be written a string | ||
representing a non-negative integer that will be used as an upper | ||
limit of the image size, in bytes. The suspend-to-disk mechanism will | ||
do its best to ensure the image size will not exceed that number. However, | ||
if this turns out to be impossible, it will try to suspend anyway using the | ||
smallest image possible. In particular, if "0" is written to this file, the | ||
suspend image will be as small as possible. | ||
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Reading from this file will display the current image size limit, which | ||
is set to 2/5 of available RAM by default. | ||
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/sys/power/pm_trace controls the code which saves the last PM event point in | ||
the RTC across reboots, so that you can debug a machine that just hangs | ||
during suspend (or more commonly, during resume). Namely, the RTC is only | ||
used to save the last PM event point if this file contains '1'. Initially it | ||
contains '0' which may be changed to '1' by writing a string representing a | ||
nonzero integer into it. | ||
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To use this debugging feature you should attempt to suspend the machine, then | ||
reboot it and run | ||
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dmesg -s 1000000 | grep 'hash matches' | ||
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CAUTION: Using it will cause your machine's real-time (CMOS) clock to be | ||
set to a random invalid time after a resume. | ||
Power Management Interface for System Sleep | ||
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Copyright (c) 2016 Intel Corp., Rafael J. Wysocki <rafael.j.wysocki@intel.com> | ||
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The power management subsystem provides userspace with a unified sysfs interface | ||
for system sleep regardless of the underlying system architecture or platform. | ||
The interface is located in the /sys/power/ directory (assuming that sysfs is | ||
mounted at /sys). | ||
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/sys/power/state is the system sleep state control file. | ||
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Reading from it returns a list of supported sleep states, encoded as: | ||
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'freeze' (Suspend-to-Idle) | ||
'standby' (Power-On Suspend) | ||
'mem' (Suspend-to-RAM) | ||
'disk' (Suspend-to-Disk) | ||
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Suspend-to-Idle is always supported. Suspend-to-Disk is always supported | ||
too as long the kernel has been configured to support hibernation at all | ||
(ie. CONFIG_HIBERNATION is set in the kernel configuration file). Support | ||
for Suspend-to-RAM and Power-On Suspend depends on the capabilities of the | ||
platform. | ||
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If one of the strings listed in /sys/power/state is written to it, the system | ||
will attempt to transition into the corresponding sleep state. Refer to | ||
Documentation/power/states.txt for a description of each of those states. | ||
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/sys/power/disk controls the operating mode of hibernation (Suspend-to-Disk). | ||
Specifically, it tells the kernel what to do after creating a hibernation image. | ||
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Reading from it returns a list of supported options encoded as: | ||
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'platform' (put the system into sleep using a platform-provided method) | ||
'shutdown' (shut the system down) | ||
'reboot' (reboot the system) | ||
'suspend' (trigger a Suspend-to-RAM transition) | ||
'test_resume' (resume-after-hibernation test mode) | ||
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The currently selected option is printed in square brackets. | ||
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The 'platform' option is only available if the platform provides a special | ||
mechanism to put the system to sleep after creating a hibernation image (ACPI | ||
does that, for example). The 'suspend' option is available if Suspend-to-RAM | ||
is supported. Refer to Documentation/power/basic_pm_debugging.txt for the | ||
description of the 'test_resume' option. | ||
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To select an option, write the string representing it to /sys/power/disk. | ||
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/sys/power/image_size controls the size of hibernation images. | ||
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It can be written a string representing a non-negative integer that will be | ||
used as a best-effort upper limit of the image size, in bytes. The hibernation | ||
core will do its best to ensure that the image size will not exceed that number. | ||
However, if that turns out to be impossible to achieve, a hibernation image will | ||
still be created and its size will be as small as possible. In particular, | ||
writing '0' to this file will enforce hibernation images to be as small as | ||
possible. | ||
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Reading from this file returns the current image size limit, which is set to | ||
around 2/5 of available RAM by default. | ||
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/sys/power/pm_trace controls the PM trace mechanism saving the last suspend | ||
or resume event point in the RTC across reboots. | ||
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It helps to debug hard lockups or reboots due to device driver failures that | ||
occur during system suspend or resume (which is more common) more effectively. | ||
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If /sys/power/pm_trace contains '1', the fingerprint of each suspend/resume | ||
event point in turn will be stored in the RTC memory (overwriting the actual | ||
RTC information), so it will survive a system crash if one occurs right after | ||
storing it and it can be used later to identify the driver that caused the crash | ||
to happen (see Documentation/power/s2ram.txt for more information). | ||
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Initially it contains '0' which may be changed to '1' by writing a string | ||
representing a nonzero integer into it. |
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