<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux.git/drivers/base/power/domain.c, branch v4.4</title>
<subtitle>Linux kernel source tree</subtitle>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/'/>
<entry>
<title>Merge branches 'powercap', 'pm-cpufreq' and 'pm-domains'</title>
<updated>2015-12-14T21:58:57+00:00</updated>
<author>
<name>Rafael J. Wysocki</name>
<email>rafael.j.wysocki@intel.com</email>
</author>
<published>2015-12-14T21:58:57+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=f1b9fc591e437ec07626ba84e1d81be19cb00eb6'/>
<id>f1b9fc591e437ec07626ba84e1d81be19cb00eb6</id>
<content type='text'>
* powercap:
  powercap / RAPL: fix BIOS lock check

* pm-cpufreq:
  cpufreq: intel_pstate: Minor cleanup for FRAC_BITS
  cpufreq: tegra: add regulator dependency for T124

* pm-domains:
  PM / Domains: Allow runtime PM callbacks to be re-used during system PM
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
* powercap:
  powercap / RAPL: fix BIOS lock check

* pm-cpufreq:
  cpufreq: intel_pstate: Minor cleanup for FRAC_BITS
  cpufreq: tegra: add regulator dependency for T124

* pm-domains:
  PM / Domains: Allow runtime PM callbacks to be re-used during system PM
</pre>
</div>
</content>
</entry>
<entry>
<title>PM / Domains: Allow runtime PM callbacks to be re-used during system PM</title>
<updated>2015-12-10T00:37:34+00:00</updated>
<author>
<name>Ulf Hansson</name>
<email>ulf.hansson@linaro.org</email>
</author>
<published>2015-11-30T15:21:38+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=ffe12855a5f7f195589130197558e6a5c276caa4'/>
<id>ffe12855a5f7f195589130197558e6a5c276caa4</id>
<content type='text'>
A runtime PM centric subsystem/driver may typically use the runtime PM
helpers, pm_runtime_force_suspend|resume() in the system PM path. This
means the genpd's runtime PM callbacks might be invoked even when runtime
PM has been disabled for the device.

To properly cope with these and similar scenarios when these helper
functions are used, change genpd to skip validating and measuring the
device PM QOS latency.

This is needed because otherwise genpd may prevent the device to be put
into low power state. If this occurs during system PM, it causes the
sequence to be aborted as a device's system PM callback returns -EBUSY.

Fixes: ba2bbfbf6307 (PM / Domains: Remove intermediate states from the power off sequence)
Reported-by: Cao Minh Hiep &lt;cm-hiep@jinso.co.jp&gt;
Reported-by: Harunaga &lt;nx-truong@jinso.co.jp&gt;
Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Cc: 4.3+ &lt;stable@vger.kernel.org&gt; # 4.3+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
A runtime PM centric subsystem/driver may typically use the runtime PM
helpers, pm_runtime_force_suspend|resume() in the system PM path. This
means the genpd's runtime PM callbacks might be invoked even when runtime
PM has been disabled for the device.

To properly cope with these and similar scenarios when these helper
functions are used, change genpd to skip validating and measuring the
device PM QOS latency.

This is needed because otherwise genpd may prevent the device to be put
into low power state. If this occurs during system PM, it causes the
sequence to be aborted as a device's system PM callback returns -EBUSY.

Fixes: ba2bbfbf6307 (PM / Domains: Remove intermediate states from the power off sequence)
Reported-by: Cao Minh Hiep &lt;cm-hiep@jinso.co.jp&gt;
Reported-by: Harunaga &lt;nx-truong@jinso.co.jp&gt;
Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Cc: 4.3+ &lt;stable@vger.kernel.org&gt; # 4.3+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge branches 'pm-domains' and 'pm-cpufreq'</title>
<updated>2015-12-04T13:01:42+00:00</updated>
<author>
<name>Rafael J. Wysocki</name>
<email>rafael.j.wysocki@intel.com</email>
</author>
<published>2015-12-04T13:01:42+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=d441fe25e7de576e36a3cd96f22b737d2f15372a'/>
<id>d441fe25e7de576e36a3cd96f22b737d2f15372a</id>
<content type='text'>
* pm-domains:
  PM / Domains: Fix bad of_node_put() in failure paths of genpd_dev_pm_attach()
  PM / Domains: Validate cases of a non-bound driver in genpd governor

* pm-cpufreq:
  cpufreq: use last policy after online for drivers with -&gt;setpolicy
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
* pm-domains:
  PM / Domains: Fix bad of_node_put() in failure paths of genpd_dev_pm_attach()
  PM / Domains: Validate cases of a non-bound driver in genpd governor

* pm-cpufreq:
  cpufreq: use last policy after online for drivers with -&gt;setpolicy
</pre>
</div>
</content>
</entry>
<entry>
<title>PM / Domains: Fix bad of_node_put() in failure paths of genpd_dev_pm_attach()</title>
<updated>2015-12-04T00:21:17+00:00</updated>
<author>
<name>Eric Anholt</name>
<email>eric@anholt.net</email>
</author>
<published>2015-12-01T17:39:31+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=265e2cf672aaa9421e7012b4aa30c0ed80f1a447'/>
<id>265e2cf672aaa9421e7012b4aa30c0ed80f1a447</id>
<content type='text'>
It looks like these meant to be unreffing the
of_parse_phandle_with_args() node, since the error paths above it
don't do of_node_put.  That function returns a new ref in pd_args.np,
though, not a new ref on dev-&gt;of_node.  Also, it would have leaked the
ref in the success case.

Fixes "ERROR: Bad of_node_put()" on bcm2835 in the -EPROBE_DEFER case.

Fixes: aa42240ab254 (PM / Domains: Add generic OF-based PM domain look-up)
Signed-off-by: Eric Anholt &lt;eric@anholt.net&gt;
Acked-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Acked-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Cc: 3.18+ &lt;stable@vger.kernel.org&gt; # 3.18+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
It looks like these meant to be unreffing the
of_parse_phandle_with_args() node, since the error paths above it
don't do of_node_put.  That function returns a new ref in pd_args.np,
though, not a new ref on dev-&gt;of_node.  Also, it would have leaked the
ref in the success case.

Fixes "ERROR: Bad of_node_put()" on bcm2835 in the -EPROBE_DEFER case.

Fixes: aa42240ab254 (PM / Domains: Add generic OF-based PM domain look-up)
Signed-off-by: Eric Anholt &lt;eric@anholt.net&gt;
Acked-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Acked-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Cc: 3.18+ &lt;stable@vger.kernel.org&gt; # 3.18+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm</title>
<updated>2015-11-12T19:50:33+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2015-11-12T19:50:33+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=be23c9d20b341a58ad7107f9e9aa5735cea3da13'/>
<id>be23c9d20b341a58ad7107f9e9aa5735cea3da13</id>
<content type='text'>
Pull more power management and ACPI updates from Rafael Wysocki:
 "The only new feature in this batch is support for the ACPI _CCA device
  configuration object, which it a pre-requisite for future ACPI PCI
  support on ARM64, but should not affect the other architectures.

  The rest is fixes and cleanups, mostly in cpufreq (including
  intel_pstate), the Operating Performace Points (OPP) framework and
  tools (cpupower and turbostat).

  Specifics:

   - Support for the ACPI _CCA configuration object intended to tell the
     OS whether or not a bus master device supports hardware managed
     cache coherency and a new set of functions to allow drivers to
     check the cache coherency support for devices in a platform
     firmware interface agnostic way (Suravee Suthikulpanit, Jeremy
     Linton).

   - ACPI backlight quirks for ESPRIMO Mobile M9410 and Dell XPS L421X
     (Aaron Lu, Hans de Goede).

   - Fixes for the arm_big_little and s5pv210-cpufreq cpufreq drivers
     (Jon Medhurst, Nicolas Pitre).

   - kfree()-related fixup for the recently introduced CPPC cpufreq
     frontend (Markus Elfring).

   - intel_pstate fix reducing kernel log noise on systems where
     P-states are managed by hardware (Prarit Bhargava).

   - intel_pstate maintainers information update (Srinivas Pandruvada).

   - cpufreq core optimization related to the handling of delayed work
     items used by governors (Viresh Kumar).

   - Locking fixes and cleanups of the Operating Performance Points
     (OPP) framework (Viresh Kumar).

   - Generic power domains framework cleanups (Lina Iyer).

   - cpupower tool updates (Jacob Tanenbaum, Sriram Raghunathan, Thomas
     Renninger).

   - turbostat tool updates (Len Brown)"

* tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits)
  PCI: ACPI: Add support for PCI device DMA coherency
  PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
  of/pci: Fix pci_get_host_bridge_device leak
  device property: ACPI: Remove unused DMA APIs
  device property: ACPI: Make use of the new DMA Attribute APIs
  device property: Adding DMA Attribute APIs for Generic Devices
  ACPI: Adding DMA Attribute APIs for ACPI Device
  device property: Introducing enum dev_dma_attr
  ACPI: Honor ACPI _CCA attribute setting
  cpufreq: CPPC: Delete an unnecessary check before the function call kfree()
  PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
  PM / OPP: Hold dev_opp_list_lock for writers
  PM / OPP: Protect updates to list_dev with mutex
  PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()
  cpufreq: s5pv210-cpufreq: fix wrong do_div() usage
  MAINTAINERS: update for intel P-state driver
  Creating a common structure initialization pattern for struct option
  cpupower: Enable disabled Cstates if they are below max latency
  cpupower: Remove debug message when using cpupower idle-set -D switch
  cpupower: cpupower monitor reports uninitialized values for offline cpus
  ...
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull more power management and ACPI updates from Rafael Wysocki:
 "The only new feature in this batch is support for the ACPI _CCA device
  configuration object, which it a pre-requisite for future ACPI PCI
  support on ARM64, but should not affect the other architectures.

  The rest is fixes and cleanups, mostly in cpufreq (including
  intel_pstate), the Operating Performace Points (OPP) framework and
  tools (cpupower and turbostat).

  Specifics:

   - Support for the ACPI _CCA configuration object intended to tell the
     OS whether or not a bus master device supports hardware managed
     cache coherency and a new set of functions to allow drivers to
     check the cache coherency support for devices in a platform
     firmware interface agnostic way (Suravee Suthikulpanit, Jeremy
     Linton).

   - ACPI backlight quirks for ESPRIMO Mobile M9410 and Dell XPS L421X
     (Aaron Lu, Hans de Goede).

   - Fixes for the arm_big_little and s5pv210-cpufreq cpufreq drivers
     (Jon Medhurst, Nicolas Pitre).

   - kfree()-related fixup for the recently introduced CPPC cpufreq
     frontend (Markus Elfring).

   - intel_pstate fix reducing kernel log noise on systems where
     P-states are managed by hardware (Prarit Bhargava).

   - intel_pstate maintainers information update (Srinivas Pandruvada).

   - cpufreq core optimization related to the handling of delayed work
     items used by governors (Viresh Kumar).

   - Locking fixes and cleanups of the Operating Performance Points
     (OPP) framework (Viresh Kumar).

   - Generic power domains framework cleanups (Lina Iyer).

   - cpupower tool updates (Jacob Tanenbaum, Sriram Raghunathan, Thomas
     Renninger).

   - turbostat tool updates (Len Brown)"

* tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits)
  PCI: ACPI: Add support for PCI device DMA coherency
  PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
  of/pci: Fix pci_get_host_bridge_device leak
  device property: ACPI: Remove unused DMA APIs
  device property: ACPI: Make use of the new DMA Attribute APIs
  device property: Adding DMA Attribute APIs for Generic Devices
  ACPI: Adding DMA Attribute APIs for ACPI Device
  device property: Introducing enum dev_dma_attr
  ACPI: Honor ACPI _CCA attribute setting
  cpufreq: CPPC: Delete an unnecessary check before the function call kfree()
  PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
  PM / OPP: Hold dev_opp_list_lock for writers
  PM / OPP: Protect updates to list_dev with mutex
  PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()
  cpufreq: s5pv210-cpufreq: fix wrong do_div() usage
  MAINTAINERS: update for intel P-state driver
  Creating a common structure initialization pattern for struct option
  cpupower: Enable disabled Cstates if they are below max latency
  cpupower: Remove debug message when using cpupower idle-set -D switch
  cpupower: cpupower monitor reports uninitialized values for offline cpus
  ...
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'clk-for-linus-20151104' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux</title>
<updated>2015-11-05T20:59:36+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2015-11-05T20:59:36+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=f66477a0aeb77f97a7de5f791700dadc42f3f792'/>
<id>f66477a0aeb77f97a7de5f791700dadc42f3f792</id>
<content type='text'>
Pull clk updates from Stephen Boyd:
 "The majority of the changes are driver updates and new device support.
  The core framework is mostly unchanged this time around, with only a
  couple patches to expose a clk provider API and make getting clk
  parent names from DT more robust.

  Driver updates:

   - Support for clock controllers found on Broadcom Northstar SoCs and
     bcm2835 SoC

   - Support for Allwinner audio clocks

   - A few cleanup patches for Tegra drivers and support for the highest
     DFLL frequencies on Tegra124

   - Samsung exynos7 fixes and improvements

   - i.Mx SoC updates to add a few missing clocks and keep debug uart
     clocks on during kernel intialization

   - Some mediatek cleanups and support for more subsystem clocks

   - Support for msm8916 gpu/audio clocks and qcom's GDSC power domain
     controllers

   - A new driver for the Silabs si514 clock chip"

* tag 'clk-for-linus-20151104' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (143 commits)
  clk: qcom: msm8960: Fix dsi1/2 halt bits
  clk: lpc18xx-cgu: fix potential system hang when disabling unused clocks
  clk: lpc18xx-ccu: fix potential system hang when disabling unused clocks
  clk: Add clk_hw_is_enabled() for use by clk providers
  clk: Add stubs for of_clk_*() APIs when CONFIG_OF=n
  clk: versatile-icst: fix memory leak
  clk: Remove clk_{register,unregister}_multiplier()
  clk: iproc: define Broadcom NS2 iProc clock binding
  clk: iproc: define Broadcom NSP iProc clock binding
  clk: ns2: add clock support for Broadcom Northstar 2 SoC
  clk: iproc: Separate status and control variables
  clk: iproc: Split off dig_filter
  clk: iproc: Add PLL base write function
  clk: nsp: add clock support for Broadcom Northstar Plus SoC
  clk: iproc: Add PWRCTRL support
  clk: cygnus: Convert all macros to all caps
  ARM: cygnus: fix link failures when CONFIG_COMMON_CLK_IPROC is disabled
  clk: imx31: add missing of_node_put
  clk: imx27: add missing of_node_put
  clk: si5351: add missing of_node_put
  ...
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull clk updates from Stephen Boyd:
 "The majority of the changes are driver updates and new device support.
  The core framework is mostly unchanged this time around, with only a
  couple patches to expose a clk provider API and make getting clk
  parent names from DT more robust.

  Driver updates:

   - Support for clock controllers found on Broadcom Northstar SoCs and
     bcm2835 SoC

   - Support for Allwinner audio clocks

   - A few cleanup patches for Tegra drivers and support for the highest
     DFLL frequencies on Tegra124

   - Samsung exynos7 fixes and improvements

   - i.Mx SoC updates to add a few missing clocks and keep debug uart
     clocks on during kernel intialization

   - Some mediatek cleanups and support for more subsystem clocks

   - Support for msm8916 gpu/audio clocks and qcom's GDSC power domain
     controllers

   - A new driver for the Silabs si514 clock chip"

* tag 'clk-for-linus-20151104' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (143 commits)
  clk: qcom: msm8960: Fix dsi1/2 halt bits
  clk: lpc18xx-cgu: fix potential system hang when disabling unused clocks
  clk: lpc18xx-ccu: fix potential system hang when disabling unused clocks
  clk: Add clk_hw_is_enabled() for use by clk providers
  clk: Add stubs for of_clk_*() APIs when CONFIG_OF=n
  clk: versatile-icst: fix memory leak
  clk: Remove clk_{register,unregister}_multiplier()
  clk: iproc: define Broadcom NS2 iProc clock binding
  clk: iproc: define Broadcom NSP iProc clock binding
  clk: ns2: add clock support for Broadcom Northstar 2 SoC
  clk: iproc: Separate status and control variables
  clk: iproc: Split off dig_filter
  clk: iproc: Add PLL base write function
  clk: nsp: add clock support for Broadcom Northstar Plus SoC
  clk: iproc: Add PWRCTRL support
  clk: cygnus: Convert all macros to all caps
  ARM: cygnus: fix link failures when CONFIG_COMMON_CLK_IPROC is disabled
  clk: imx31: add missing of_node_put
  clk: imx27: add missing of_node_put
  clk: si5351: add missing of_node_put
  ...
</pre>
</div>
</content>
</entry>
<entry>
<title>PM / Domains: Allocate memory outside domain locks</title>
<updated>2015-11-02T01:26:17+00:00</updated>
<author>
<name>Lina Iyer</name>
<email>lina.iyer@linaro.org</email>
</author>
<published>2015-10-28T21:19:50+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=2547923d1cc38b4b55c538e450411586acc39ac6'/>
<id>2547923d1cc38b4b55c538e450411586acc39ac6</id>
<content type='text'>
In preparation for supporting IRQ-safe domains, allocate domain data
outside the domain locks. These functions are not called in an atomic
context, so we can always allocate memory using GFP_KERNEL. By
allocating memory before the locks, we can safely lock the domain using
spinlocks instead of mutexes.

Reviewed-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Acked-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Signed-off-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
In preparation for supporting IRQ-safe domains, allocate domain data
outside the domain locks. These functions are not called in an atomic
context, so we can always allocate memory using GFP_KERNEL. By
allocating memory before the locks, we can safely lock the domain using
spinlocks instead of mutexes.

Reviewed-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Acked-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Signed-off-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>PM / Domains: Remove dev-&gt;driver check for runtime PM</title>
<updated>2015-11-02T01:23:11+00:00</updated>
<author>
<name>Lina Iyer</name>
<email>lina.iyer@linaro.org</email>
</author>
<published>2015-10-28T21:18:59+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=298cd0f0880188422a518e9d780bd49d66ea7ad5'/>
<id>298cd0f0880188422a518e9d780bd49d66ea7ad5</id>
<content type='text'>
Remove check for driver of a device, for runtime PM. Device may be
suspended without an explicit driver. This check seems to be vestigial
and incorrect in the current context.

Reviewed-by: Krzysztof Kozlowski &lt;k.kozlowski@samsung.com&gt;
Acked-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Signed-off-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Signed-off-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Remove check for driver of a device, for runtime PM. Device may be
suspended without an explicit driver. This check seems to be vestigial
and incorrect in the current context.

Reviewed-by: Krzysztof Kozlowski &lt;k.kozlowski@samsung.com&gt;
Acked-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Signed-off-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Signed-off-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>PM / Domains: Merge measurements for PM QoS device latencies</title>
<updated>2015-10-28T03:33:04+00:00</updated>
<author>
<name>Ulf Hansson</name>
<email>ulf.hansson@linaro.org</email>
</author>
<published>2015-10-15T15:02:19+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=2b1d88cda32f81685bae45c00bf517f77bcda3cd'/>
<id>2b1d88cda32f81685bae45c00bf517f77bcda3cd</id>
<content type='text'>
Measure latency does by itself contribute to an increased latency, thus we
should avoid it when it isn't needed.

By merging the latency measurements for the -&gt;save_state() and the
-&gt;stop() callbacks, we get one measurement instead of two and we get one
value to store instead of two. Let's also apply the likewise change for
the -&gt;start() and -&gt;restore_state() callbacks.

Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Reviewed-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Acked-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Measure latency does by itself contribute to an increased latency, thus we
should avoid it when it isn't needed.

By merging the latency measurements for the -&gt;save_state() and the
-&gt;stop() callbacks, we get one measurement instead of two and we get one
value to store instead of two. Let's also apply the likewise change for
the -&gt;start() and -&gt;restore_state() callbacks.

Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Reviewed-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Acked-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>PM / Domains: Don't measure -&gt;start|stop() latency in system PM callbacks</title>
<updated>2015-10-28T03:33:04+00:00</updated>
<author>
<name>Ulf Hansson</name>
<email>ulf.hansson@linaro.org</email>
</author>
<published>2015-10-15T15:02:06+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux.git/commit/?id=51cda844892fded75d3ad07d0233e73572eba2f3'/>
<id>51cda844892fded75d3ad07d0233e73572eba2f3</id>
<content type='text'>
Measure latency does by itself contribute to an increased latency, thus we
should avoid it when it isn't needed.

Genpd measures latencies in the system PM phase for the -&gt;start|stop()
callbacks and is thus affecting the system PM suspend/resume time.
Moreover these latencies are validated only at runtime PM suspend/resume.

To this reasoning, let's decide to leave these measurements out of the
system PM phase. There should be plenty of occasions during runtime PM to
perform these measurements anyway.

Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Reviewed-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Acked-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Measure latency does by itself contribute to an increased latency, thus we
should avoid it when it isn't needed.

Genpd measures latencies in the system PM phase for the -&gt;start|stop()
callbacks and is thus affecting the system PM suspend/resume time.
Moreover these latencies are validated only at runtime PM suspend/resume.

To this reasoning, let's decide to leave these measurements out of the
system PM phase. There should be plenty of occasions during runtime PM to
perform these measurements anyway.

Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Reviewed-by: Lina Iyer &lt;lina.iyer@linaro.org&gt;
Acked-by: Kevin Hilman &lt;khilman@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</pre>
</div>
</content>
</entry>
</feed>
