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  • linux-arm
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  • efi
  • quirks.c
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  • Chen Yu's avatar
    ACPI / PM: Introduce efi poweroff for HW-full platforms without _S5 · 13737181
    Chen Yu authored Mar 22, 2016
    
    
    The problem is Linux registers pm_power_off = efi_power_off only if
    we are in hardware reduced mode. Actually, what we also want is to do
    this when ACPI S5 is simply not supported on non-legacy platforms.
    Since some future Intel platforms are HW-full mode where the DSDT
    fails to supply an _S5 object(without SLP_TYP), we should let such
    kind of platform to leverage efi runtime service to poweroff.
    
    This patch uses efi power off as first choice when S5 is unavailable,
    even if there is a customized poweroff(driver provided, eg).
    Meanwhile, the legacy platforms will not be affected because there is
    no path for them to overwrite the pm_power_off to efi power off.
    
    Suggested-by: default avatarLen Brown <len.brown@intel.com>
    Reviewed-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
    Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    13737181