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| author | Chen Yu <yu.c.chen@intel.com> | 2016-03-22 08:51:10 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-04-09 02:11:43 +0200 |
| commit | 1373718194ebebc43c00d8f117e03885749495b0 (patch) | |
| tree | 8fffff6302b18df6b12cbc2fc79d04c58135faff /include/linux/acpi.h | |
| parent | 9735a22799b9214d17d3c231fe377fc852f042e9 (diff) | |
| download | lwn-1373718194ebebc43c00d8f117e03885749495b0.tar.gz lwn-1373718194ebebc43c00d8f117e03885749495b0.zip | |
ACPI / PM: Introduce efi poweroff for HW-full platforms without _S5
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: Len Brown <len.brown@intel.com>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/acpi.h')
| -rw-r--r-- | include/linux/acpi.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 06ed7e54033e..4d2e67f633b6 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -278,6 +278,7 @@ void acpi_irq_stats_init(void); extern u32 acpi_irq_handled; extern u32 acpi_irq_not_handled; extern unsigned int acpi_sci_irq; +extern bool acpi_no_s5; #define INVALID_ACPI_IRQ ((unsigned)-1) static inline bool acpi_sci_irq_valid(void) { |