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x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag

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It appears that the BayTrail-T class of hardware requires EFI in order
to powerdown and reboot and no other reliable method exists.

This quirk is generally applicable to all hardware that has the ACPI
Hardware Reduced bit set, since usually ACPI would be the preferred
method.

Cc: Len Brown <len.brown@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming
2014-06-13 12:39:55 +01:00
parent 0c5ed61adb
commit 44be28e9dd
5 changed files with 54 additions and 2 deletions
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8
drivers/firmware/efi/reboot.c
View File

@@ -5,6 +5,8 @@
#include <linux/efi.h>
#include <linux/reboot.h>
int efi_reboot_quirk_mode = -1;
void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
{
int efi_mode;
@@ -22,6 +24,12 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
break;
}
/*
* If a quirk forced an EFI reset mode, always use that.
*/
if (efi_reboot_quirk_mode != -1)
efi_mode = efi_reboot_quirk_mode;
efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
}