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Merge tag 'media/v4.12-2' into patchwork
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media fixes for v4.12-rc4

* tag 'media/v4.12-2': (598 commits)
  [media] rc-core: race condition during ir_raw_event_register()
  [media] cec: drop MEDIA_CEC_DEBUG
  [media] cec: rename MEDIA_CEC_NOTIFIER to CEC_NOTIFIER
  [media] cec: select CEC_CORE instead of depend on it
  [media] rainshadow-cec: ensure exit_loop is intialized
  [media] atomisp: don't treat warnings as errors
  Linux 4.12-rc3
  x86/ftrace: Make sure that ftrace trampolines are not RWX
  x86/mm/ftrace: Do not bug in early boot on irqs_disabled in cpu_flush_range()
  selftests/ftrace: Add a testcase for many kprobe events
  kprobes/x86: Fix to set RWX bits correctly before releasing trampoline
  ftrace: Fix memory leak in ftrace_graph_release()
  ipv4: add reference counting to metrics
  net: ethernet: ax88796: don't call free_irq without request_irq first
  ip6_tunnel, ip6_gre: fix setting of DSCP on encapsulated packets
  sctp: fix ICMP processing if skb is non-linear
  net: llc: add lock_sock in llc_ui_bind to avoid a race condition
  PCI/msi: fix the pci_alloc_irq_vectors_affinity stub
  blk-mq: Only register debugfs attributes for blk-mq queues
  x86/timers: Move simple_udelay_calibration past init_hypervisor_platform
  ...

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
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mchehab committed Jun 7, 2017
2 parents 6fb05e0 + 963761a commit 42654eb
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16 changes: 12 additions & 4 deletions Documentation/acpi/acpi-lid.txt
Original file line number Diff line number Diff line change
Expand Up @@ -59,20 +59,28 @@ button driver uses the following 3 modes in order not to trigger issues.
If the userspace hasn't been prepared to ignore the unreliable "opened"
events and the unreliable initial state notification, Linux users can use
the following kernel parameters to handle the possible issues:
A. button.lid_init_state=open:
A. button.lid_init_state=method:
When this option is specified, the ACPI button driver reports the
initial lid state using the returning value of the _LID control method
and whether the "opened"/"closed" events are paired fully relies on the
firmware implementation.
This option can be used to fix some platforms where the returning value
of the _LID control method is reliable but the initial lid state
notification is missing.
This option is the default behavior during the period the userspace
isn't ready to handle the buggy AML tables.
B. button.lid_init_state=open:
When this option is specified, the ACPI button driver always reports the
initial lid state as "opened" and whether the "opened"/"closed" events
are paired fully relies on the firmware implementation.
This may fix some platforms where the returning value of the _LID
control method is not reliable and the initial lid state notification is
missing.
This option is the default behavior during the period the userspace
isn't ready to handle the buggy AML tables.

If the userspace has been prepared to ignore the unreliable "opened" events
and the unreliable initial state notification, Linux users should always
use the following kernel parameter:
B. button.lid_init_state=ignore:
C. button.lid_init_state=ignore:
When this option is specified, the ACPI button driver never reports the
initial lid state and there is a compensation mechanism implemented to
ensure that the reliable "closed" notifications can always be delievered
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19 changes: 10 additions & 9 deletions Documentation/admin-guide/pm/cpufreq.rst
Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
.. |struct cpufreq_policy| replace:: :c:type:`struct cpufreq_policy <cpufreq_policy>`
.. |intel_pstate| replace:: :doc:`intel_pstate <intel_pstate>`

=======================
CPU Performance Scaling
Expand Down Expand Up @@ -75,7 +76,7 @@ feedback registers, as that information is typically specific to the hardware
interface it comes from and may not be easily represented in an abstract,
platform-independent way. For this reason, ``CPUFreq`` allows scaling drivers
to bypass the governor layer and implement their own performance scaling
algorithms. That is done by the ``intel_pstate`` scaling driver.
algorithms. That is done by the |intel_pstate| scaling driver.


``CPUFreq`` Policy Objects
Expand Down Expand Up @@ -174,13 +175,13 @@ necessary to restart the scaling governor so that it can take the new online CPU
into account. That is achieved by invoking the governor's ``->stop`` and
``->start()`` callbacks, in this order, for the entire policy.

As mentioned before, the ``intel_pstate`` scaling driver bypasses the scaling
As mentioned before, the |intel_pstate| scaling driver bypasses the scaling
governor layer of ``CPUFreq`` and provides its own P-state selection algorithms.
Consequently, if ``intel_pstate`` is used, scaling governors are not attached to
Consequently, if |intel_pstate| is used, scaling governors are not attached to
new policy objects. Instead, the driver's ``->setpolicy()`` callback is invoked
to register per-CPU utilization update callbacks for each policy. These
callbacks are invoked by the CPU scheduler in the same way as for scaling
governors, but in the ``intel_pstate`` case they both determine the P-state to
governors, but in the |intel_pstate| case they both determine the P-state to
use and change the hardware configuration accordingly in one go from scheduler
context.

Expand Down Expand Up @@ -257,7 +258,7 @@ are the following:

``scaling_available_governors``
List of ``CPUFreq`` scaling governors present in the kernel that can
be attached to this policy or (if the ``intel_pstate`` scaling driver is
be attached to this policy or (if the |intel_pstate| scaling driver is
in use) list of scaling algorithms provided by the driver that can be
applied to this policy.

Expand All @@ -274,7 +275,7 @@ are the following:
the CPU is actually running at (due to hardware design and other
limitations).

Some scaling drivers (e.g. ``intel_pstate``) attempt to provide
Some scaling drivers (e.g. |intel_pstate|) attempt to provide
information more precisely reflecting the current CPU frequency through
this attribute, but that still may not be the exact current CPU
frequency as seen by the hardware at the moment.
Expand All @@ -284,13 +285,13 @@ are the following:

``scaling_governor``
The scaling governor currently attached to this policy or (if the
``intel_pstate`` scaling driver is in use) the scaling algorithm
|intel_pstate| scaling driver is in use) the scaling algorithm
provided by the driver that is currently applied to this policy.

This attribute is read-write and writing to it will cause a new scaling
governor to be attached to this policy or a new scaling algorithm
provided by the scaling driver to be applied to it (in the
``intel_pstate`` case), as indicated by the string written to this
|intel_pstate| case), as indicated by the string written to this
attribute (which must be one of the names listed by the
``scaling_available_governors`` attribute described above).

Expand Down Expand Up @@ -619,7 +620,7 @@ This file is located under :file:`/sys/devices/system/cpu/cpufreq/` and controls
the "boost" setting for the whole system. It is not present if the underlying
scaling driver does not support the frequency boost mechanism (or supports it,
but provides a driver-specific interface for controlling it, like
``intel_pstate``).
|intel_pstate|).

If the value in this file is 1, the frequency boost mechanism is enabled. This
means that either the hardware can be put into states in which it is able to
Expand Down
1 change: 1 addition & 0 deletions Documentation/admin-guide/pm/index.rst
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ Power Management
:maxdepth: 2

cpufreq
intel_pstate

.. only:: subproject and html

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