• Rafael J. Wysocki's avatar
    ACPI / LPSS: Power up LPSS devices during enumeration · b9e95fc6
    Rafael J. Wysocki authored
    Commit 7cd8407d (ACPI / PM: Do not execute _PS0 for devices without
    _PSC during initialization) introduced a regression on some systems
    with Intel Lynxpoint Low-Power Subsystem (LPSS) where some devices
    need to be powered up during initialization, but their device objects
    in the ACPI namespace have _PS0 and _PS3 only (without _PSC or power
    resources).
    
    To work around this problem, make the ACPI LPSS driver power up
    devices it knows about by using a new helper function
    acpi_device_fix_up_power() that does all of the necessary
    sanity checks and calls acpi_dev_pm_explicit_set() to put the
    device into D0.
    Reported-and-tested-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    b9e95fc6
acpi_bus.h 15.5 KB