Merge tag 'pm+acpi-3.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management and ACPI fixes from Rafael Wysocki:

 - intel_pstate driver fixes and cleanups from Dirk Brandewie and Wei
   Yongjun.

 - cpufreq fixes related to ARM big.LITTLE support and the cpufreq-cpu0
   driver from Viresh Kumar.

 - Assorted cpufreq fixes from Srivatsa S Bhat, Borislav Petkov, Wolfram
   Sang, Alexander Shiyan, and Nishanth Menon.

 - Assorted ACPI fixes from Catalin Marinas, Lan Tianyu, Alex Hung,
   Jan-Simon Möller, and Rafael J Wysocki.

 - Fix for a kfree() under spinlock in the PM core from Shuah Khan.

 - PM documentation updates from Borislav Petkov and Zhang Rui.

* tag 'pm+acpi-3.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (30 commits)
  cpufreq: Preserve sysfs files across suspend/resume
  ACPI / scan: Fix memory leak on acpi_scan_init_hotplug() error path
  PM / hibernate: Correct documentation
  PM / Documentation: remove inaccurate suspend/hibernate transition lantency statement
  PM: Documentation update for freeze state
  cpufreq / intel_pstate: use vzalloc() instead of vmalloc()/memset(0)
  cpufreq, ondemand: Remove leftover debug line
  PM: Avoid calling kfree() under spinlock in dev_pm_put_subsys_data()
  cpufreq / kirkwood: don't check resource with devm_ioremap_resource
  cpufreq / intel_pstate: remove #ifdef MODULE compile fence
  cpufreq / intel_pstate: Remove idle mode PID
  cpufreq / intel_pstate: fix ffmpeg regression
  cpufreq / intel_pstate: use lowest requested max performance
  cpufreq / intel_pstate: remove idle time and duration from sample and calculations
  cpufreq: Fix incorrect dependecies for ARM SA11xx drivers
  cpufreq: ARM big LITTLE: Fix Kconfig entries
  cpufreq: cpufreq-cpu0: Free parent node for error cases
  cpufreq: cpufreq-cpu0: defer probe when regulator is not ready
  cpufreq: Issue CPUFREQ_GOV_POLICY_EXIT notifier before dropping policy refcount
  cpufreq: governors: Fix CPUFREQ_GOV_POLICY_{INIT|EXIT} notifiers
  ...

1 files changed, 17 insertions, 13 deletions

diff --git a/Documentation/power/states.txt b/Documentation/power/states.txt
index 4416b28630d..442d43df9b2 100644
--- a/Documentation/power/states.txt
+++ b/Documentation/power/states.txt
@@ -2,12 +2,26 @@
 System Power Management States
 
 
-The kernel supports three power management states generically, though
-each is dependent on platform support code to implement the low-level
-details for each state. This file describes each state, what they are
+The kernel supports four power management states generically, though
+one is generic and the other three are dependent on platform support
+code to implement the low-level details for each state.
+This file describes each state, what they are
 commonly called, what ACPI state they map to, and what string to write
 to /sys/power/state to enter that state
 
+state:		Freeze / Low-Power Idle
+ACPI state:	S0
+String:		"freeze"
+
+This state is a generic, pure software, light-weight, low-power state.
+It allows more energy to be saved relative to idle by freezing user
+space and putting all I/O devices into low-power states (possibly
+lower-power than available at run time), such that the processors can
+spend more time in their idle states.
+This state can be used for platforms without Standby/Suspend-to-RAM
+support, or it can be used in addition to Suspend-to-RAM (memory sleep)
+to provide reduced resume latency.
+
 
 State:		Standby / Power-On Suspend
 ACPI State:	S1
@@ -22,9 +36,6 @@ We try to put devices in a low-power state equivalent to D1, which
 also offers low power savings, but low resume latency. Not all devices
 support D1, and those that don't are left on. 
 
-A transition from Standby to the On state should take about 1-2
-seconds. 
-
 
 State:		Suspend-to-RAM
 ACPI State:	S3
@@ -42,9 +53,6 @@ transition back to the On state.
 For at least ACPI, STR requires some minimal boot-strapping code to
 resume the system from STR. This may be true on other platforms. 
 
-A transition from Suspend-to-RAM to the On state should take about
-3-5 seconds. 
-
 
 State:		Suspend-to-disk
 ACPI State:	S4
@@ -74,7 +82,3 @@ low-power state (like ACPI S4), or it may simply power down. Powering
 down offers greater savings, and allows this mechanism to work on any
 system. However, entering a real low-power state allows the user to
 trigger wake up events (e.g. pressing a key or opening a laptop lid).
-
-A transition from Suspend-to-Disk to the On state should take about 30
-seconds, though it's typically a bit more with the current
-implementation.