WSL2-Linux-Kernel/kernel/power
Rafael J. Wysocki 9cd9a0058d Hibernation: Enter platform hibernation state in a consistent way
Make hibernation_platform_enter() execute the enter-a-sleep-state sequence
instead of the mixed shutdown-with-entering-S4 thing.

Replace the shutting down of devices done by kernel_shutdown_prepare(), before
entering the ACPI S4 sleep state, with suspending them and the shutting down
of sysdevs with calling device_power_down(PMSG_SUSPEND) (just like before
entering S1 or S3, but the target state is now S4).   Also, disable the
nonboot CPUs before entering the sleep state (S4), which generally always is a
good idea.

This is known to fix the "double disk spin down during hibernation" on some
machines, eg.  HPC nx6325 (ref.  http://lkml.org/lkml/2007/8/7/316 and the
following thread).   Moreover, it has been reported to make
/sys/class/rtc/rtc0/wakealarm work correctly with hibernation for some users.
It also generally causes the hibernation state (ACPI S4) to be entered faster.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-18 14:37:20 -07:00
..
Kconfig serial: turn serial console suspend a boot rather than compile time option 2007-10-18 14:37:19 -07:00
Makefile Introduce CONFIG_SUSPEND for suspend-to-Ram and standby 2007-07-29 16:45:38 -07:00
console.c [PATCH] swsusp: fix suspend when console is in VT_AUTO+KD_GRAPHICS mode 2007-03-16 19:25:05 -07:00
disk.c Hibernation: Enter platform hibernation state in a consistent way 2007-10-18 14:37:20 -07:00
main.c freezer: do not sync filesystems from freeze_processes 2007-10-18 14:37:18 -07:00
pm.c [PATCH] remove kernel/power/pm.c:pm_unregister_all() 2006-07-12 16:09:08 -07:00
power.h Hibernation: Check if ACPI is enabled during restore in the right place 2007-10-18 14:37:20 -07:00
poweroff.c WorkStruct: Pass the work_struct pointer instead of context data 2006-11-22 14:55:48 +00:00
process.c freezer: measure freezing time 2007-10-18 14:37:19 -07:00
snapshot.c Hibernation: Arbitrary boot kernel support - generic code 2007-10-18 14:37:19 -07:00
swap.c swsusp: introduce restore platform operations 2007-07-19 10:04:42 -07:00
swsusp.c Hibernation: Check if ACPI is enabled during restore in the right place 2007-10-18 14:37:20 -07:00
user.c freezer: do not sync filesystems from freeze_processes 2007-10-18 14:37:18 -07:00