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PM: ACPI: reboot: Reinstate S5 for reboot 

Commit d60cd06331 ("PM: ACPI: reboot: Use S5 for reboot") caused Dell
PowerEdge r440 hangs at reboot.

The issue is fixed by commit 2ca1c94ce0 ("tg3: Disable tg3 device on
system reboot to avoid triggering AER"), so use the new sysoff API to
reinstate S5 for reboot on ACPI-based systems.

Using S5 for reboot is default behavior under Windows: "A full shutdown
(S5) occurs when a system restart is requested" [1].

Link: https://docs.microsoft.com/en-us/windows/win32/power/system-power-state # [1]
Suggested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kai-Heng Feng 2022-09-29 15:05:24 +08:00 committed by Rafael J. Wysocki
parent e7fd8b6840
commit 38f34dba80
1 changed files with 8 additions and 0 deletions
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8
drivers/acpi/sleep.c
View File

@ -1088,6 +1088,14 @@ int __init acpi_sleep_init(void)
register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
SYS_OFF_PRIO_FIRMWARE,
acpi_power_off, NULL);
/*
* Windows uses S5 for reboot, so some BIOSes depend on it to
* perform proper reboot.
*/
register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
SYS_OFF_PRIO_FIRMWARE,
acpi_power_off_prepare, NULL);
} else {
acpi_no_s5 = true;
}