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>
diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index ab50ada..818d12a 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -373,5 +373,5 @@
bool efi_poweroff_required(void)
{
- return !!acpi_gbl_reduced_hardware;
+ return acpi_gbl_reduced_hardware || acpi_no_s5;
}
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 2a8b596..7a2e4d4 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -26,6 +26,11 @@
#include "internal.h"
#include "sleep.h"
+/*
+ * Some HW-full platforms do not have _S5, so they may need
+ * to leverage efi power off for a shutdown.
+ */
+bool acpi_no_s5;
static u8 sleep_states[ACPI_S_STATE_COUNT];
static void acpi_sleep_tts_switch(u32 acpi_state)
@@ -882,6 +887,8 @@
sleep_states[ACPI_STATE_S5] = 1;
pm_power_off_prepare = acpi_power_off_prepare;
pm_power_off = acpi_power_off;
+ } else {
+ acpi_no_s5 = true;
}
supported[0] = 0;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 06ed7e5..4d2e67f 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -278,6 +278,7 @@
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)
{
