• Linus Torvalds's avatar
    Merge tag 'pm+acpi-4.4-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 0d51ce9c
    Linus Torvalds authored
    Pull power management and ACPI updates from Rafael Wysocki:
     "Quite a new features are included this time.
    
      First off, the Collaborative Processor Performance Control interface
      (version 2) defined by ACPI will now be supported on ARM64 along with
      a cpufreq frontend for CPU performance scaling.
    
      Second, ACPI gets a new infrastructure for the early probing of IRQ
      chips and clock sources (along the lines of the existing similar
      mechanism for DT).
    
      Next, the ACPI core and the generic device properties API will now
      support a recently introduced hierarchical properties extension of the
      _DSD (Device Specific Data) ACPI device configuration object.  If the
      ACPI platform firmware uses that extension to organize device
      properties in a hierarchical way, the kernel will automatically handle
      it and make those properties available to device drivers via the
      generic device properties API.
    
      It also will be possible to build the ACPICA's AML interpreter
      debugger into the kernel now and use that to diagnose AML-related
      problems more efficiently.  In the future, this should make it
      possible to single-step AML execution and do similar things.
      Interesting stuff, although somewhat experimental at this point.
    
      Finally, the PM core gets a new mechanism that can be used by device
      drivers to distinguish between suspend-to-RAM (based on platform
      firmware support) and suspend-to-idle (or other variants of system
      suspend the platform firmware is not involved in) and possibly
      optimize their device suspend/resume handling accordingly.
    
      In addition to that, some existing features are re-organized quite
      substantially.
    
      First, the ACPI-based handling of PCI host bridges on x86 and ia64 is
      unified and the common code goes into the ACPI core (so as to reduce
      code duplication and eliminate non-essential differences between the
      two architectures in that area).
    
      Second, the Operating Performance Points (OPP) framework is
      reorganized to make the code easier to find and follow.
    
      Next, the cpufreq core's sysfs interface is reorganized to get rid of
      the "primary CPU" concept for configurations in which the same
      performance scaling settings are shared between multiple CPUs.
    
      Finally, some interfaces that aren't necessary any more are dropped
      from the generic power domains framework.
    
      On top of the above we have some minor extensions, cleanups and bug
      fixes in multiple places, as usual.
    
      Specifics:
    
       - ACPICA update to upstream revision 20150930 (Bob Moore, Lv Zheng).
    
         The most significant change is to allow the AML debugger to be
         built into the kernel.  On top of that there is an update related
         to the NFIT table (the ACPI persistent memory interface) and a few
         fixes and cleanups.
    
       - ACPI CPPC2 (Collaborative Processor Performance Control v2) support
         along with a cpufreq frontend (Ashwin Chaugule).
    
         This can only be enabled on ARM64 at this point.
    
       - New ACPI infrastructure for the early probing of IRQ chips and
         clock sources (Marc Zyngier).
    
       - Support for a new hierarchical properties extension of the ACPI
         _DSD (Device Specific Data) device configuration object allowing
         the kernel to handle hierarchical properties (provided by the
         platform firmware this way) automatically and make them available
         to device drivers via the generic device properties interface
         (Rafael Wysocki).
    
       - Generic device properties API extension to obtain an index of
         certain string value in an array of strings, along the lines of
         of_property_match_string(), but working for all of the supported
         firmware node types, and support for the "dma-names" device
         property based on it (Mika Westerberg).
    
       - ACPI core fix to parse the MADT (Multiple APIC Description Table)
         entries in the order expected by platform firmware (and mandated by
         the specification) to avoid confusion on systems with more than 255
         logical CPUs (Lukasz Anaczkowski).
    
       - Consolidation of the ACPI-based handling of PCI host bridges on x86
         and ia64 (Jiang Liu).
    
       - ACPI core fixes to ensure that the correct IRQ number is used to
         represent the SCI (System Control Interrupt) in the cases when it
         has been re-mapped (Chen Yu).
    
       - New ACPI backlight quirk for Lenovo IdeaPad S405 (Hans de Goede).
    
       - ACPI EC driver fixes (Lv Zheng).
    
       - Assorted ACPI fixes and cleanups (Dan Carpenter, Insu Yun, Jiri
         Kosina, Rami Rosen, Rasmus Villemoes).
    
       - New mechanism in the PM core allowing drivers to check if the
         platform firmware is going to be involved in the upcoming system
         suspend or if it has been involved in the suspend the system is
         resuming from at the moment (Rafael Wysocki).
    
         This should allow drivers to optimize their suspend/resume handling
         in some cases and the changes include a couple of users of it (the
         i8042 input driver, PCI PM).
    
       - PCI PM fix to prevent runtime-suspended devices with PME enabled
         from being resumed during system suspend even if they aren't
         configured to wake up the system from sleep (Rafael Wysocki).
    
       - New mechanism to report the number of a wakeup IRQ that woke up the
         system from sleep last time (Alexandra Yates).
    
       - Removal of unused interfaces from the generic power domains
         framework and fixes related to latency measurements in that code
         (Ulf Hansson, Daniel Lezcano).
    
       - cpufreq core sysfs interface rework to make it handle CPUs that
         share performance scaling settings (represented by a common cpufreq
         policy object) more symmetrically (Viresh Kumar).
    
         This should help to simplify the CPU offline/online handling among
         other things.
    
       - cpufreq core fixes and cleanups (Viresh Kumar).
    
       - intel_pstate fixes related to the Turbo Activation Ratio (TAR)
         mechanism on client platforms which causes the turbo P-states range
         to vary depending on platform firmware settings (Srinivas
         Pandruvada).
    
       - intel_pstate sysfs interface fix (Prarit Bhargava).
    
       - Assorted cpufreq driver (imx, tegra20, powernv, integrator) fixes
         and cleanups (Bai Ping, Bartlomiej Zolnierkiewicz, Shilpasri G
         Bhat, Luis de Bethencourt).
    
       - cpuidle mvebu driver cleanups (Russell King).
    
       - OPP (Operating Performance Points) framework code reorganization to
         make it more maintainable (Viresh Kumar).
    
       - Intel Broxton support for the RAPL (Running Average Power Limits)
         power capping driver (Amy Wiles).
    
       - Assorted power management code fixes and cleanups (Dan Carpenter,
         Geert Uytterhoeven, Geliang Tang, Luis de Bethencourt, Rasmus
         Villemoes)"
    
    * tag 'pm+acpi-4.4-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (108 commits)
      cpufreq: postfix policy directory with the first CPU in related_cpus
      cpufreq: create cpu/cpufreq/policyX directories
      cpufreq: remove cpufreq_sysfs_{create|remove}_file()
      cpufreq: create cpu/cpufreq at boot time
      cpufreq: Use cpumask_copy instead of cpumask_or to copy a mask
      cpufreq: ondemand: Drop unnecessary locks from update_sampling_rate()
      PM / Domains: Merge measurements for PM QoS device latencies
      PM / Domains: Don't measure ->start|stop() latency in system PM callbacks
      PM / clk: Fix broken build due to non-matching code and header #ifdefs
      ACPI / Documentation: add copy_dsdt to ACPI format options
      ACPI / sysfs: correctly check failing memory allocation
      ACPI / video: Add a quirk to force native backlight on Lenovo IdeaPad S405
      ACPI / CPPC: Fix potential memory leak
      ACPI / CPPC: signedness bug in register_pcc_channel()
      ACPI / PAD: power_saving_thread() is not freezable
      ACPI / PM: Fix incorrect wakeup IRQ setting during suspend-to-idle
      ACPI: Using correct irq when waiting for events
      ACPI: Use correct IRQ when uninstalling ACPI interrupt handler
      cpuidle: mvebu: disable the bind/unbind attributes and use builtin_platform_driver
      cpuidle: mvebu: clean up multiple platform drivers
      ...
    0d51ce9c
fwnode.h 630 Bytes