Eric Lee / smarc-fsl-linux-kernel

08 Nov, 2011

1 commit

  • 3c0030320   Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux ... Browse Code »

    * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
    cpuidle: Single/Global registration of idle states
    cpuidle: Split cpuidle_state structure and move per-cpu statistics fields
    cpuidle: Remove CPUIDLE_FLAG_IGNORE and dev->prepare()
    cpuidle: Move dev->last_residency update to driver enter routine; remove dev->last_state
    ACPI: Fix CONFIG_ACPI_DOCK=n compiler warning
    ACPI: Export FADT pm_profile integer value to userspace
    thermal: Prevent polling from happening during system suspend
    ACPI: Drop ACPI_NO_HARDWARE_INIT
    ACPI atomicio: Convert width in bits to bytes in __acpi_ioremap_fast()
    PNPACPI: Simplify disabled resource registration
    ACPI: Fix possible recursive locking in hwregs.c
    ACPI: use kstrdup()
    mrst pmu: update comment
    tools/power turbostat: less verbose debugging

    Linus Torvalds
     

07 Nov, 2011

2 commits

  • 46bcfad7a   cpuidle: Single/Global registration of idle states ... Browse Code »
    43

    This patch makes the cpuidle_states structure global (single copy)
    instead of per-cpu. The statistics needed on per-cpu basis
    by the governor are kept per-cpu. This simplifies the cpuidle
    subsystem as state registration is done by single cpu only.
    Having single copy of cpuidle_states saves memory. Rare case
    of asymmetric C-states can be handled within the cpuidle driver
    and architectures such as POWER do not have asymmetric C-states.

    Having single/global registration of all the idle states,
    dynamic C-state transitions on x86 are handled by
    the boot cpu. Here, the boot cpu would disable all the devices,
    re-populate the states and later enable all the devices,
    irrespective of the cpu that would receive the notification first.

    Reference:
    https://lkml.org/lkml/2011/4/25/83

    Signed-off-by: Deepthi Dharwar
    Signed-off-by: Trinabh Gupta
    Tested-by: Jean Pihet
    Reviewed-by: Kevin Hilman
    Acked-by: Arjan van de Ven
    Acked-by: Kevin Hilman
    Signed-off-by: Len Brown

    Deepthi Dharwar
     
  • e978aa7d7   cpuidle: Move dev->last_residency update to driver enter routine; remove dev->last_state ... Browse Code »
    86

    Cpuidle governor only suggests the state to enter using the
    governor->select() interface, but allows the low level driver to
    override the recommended state. The actual entered state
    may be different because of software or hardware demotion. Software
    demotion is done by the back-end cpuidle driver and can be accounted
    correctly. Current cpuidle code uses last_state field to capture the
    actual state entered and based on that updates the statistics for the
    state entered.

    Ideally the driver enter routine should update the counters,
    and it should return the state actually entered rather than the time
    spent there. The generic cpuidle code should simply handle where
    the counters live in the sysfs namespace, not updating the counters.

    Reference:
    https://lkml.org/lkml/2011/3/25/52

    Signed-off-by: Deepthi Dharwar
    Signed-off-by: Trinabh Gupta
    Tested-by: Jean Pihet
    Reviewed-by: Kevin Hilman
    Acked-by: Arjan van de Ven
    Acked-by: Kevin Hilman
    Signed-off-by: Len Brown

    Deepthi Dharwar
     

01 Nov, 2011

1 commit

11 Nov, 2009

1 commit

  • 1ea60cf70   ARM: 5778/1: AT91: Add cpuidle support ... Browse Code »

    This patch adds the support for cpuidle on AT91 SoCs, taken from the
    cpuidle support in mach-kirkwood.
    cpuidle needs sdram_selfrefresh_enable and _disable, so move their
    definition to a separate header file instead of duplicating the code
    already used in pm.c.

    Tested-by: Nicolas Ferre
    Signed-off-by: Albin Tonnerre
    Acked-by: Andrew Victor
    Signed-off-by: Russell King

    Albin Tonnerre