[PATCH v6 00/11] Improvements to S5 power consumption

Mario Limonciello (AMD)
2025-08-18T02:01:11Z

A variety of issues both in function and in power consumption have been
raised as a result of devices not being put into a low power state when
the system is powered off.

There have been some localized changes[1] to PCI core to help these issues,
but they have had various downsides.

This series instead tries to use the S4 flow when the system is being
powered off. This lines up the behavior with what other operating systems
do as well. If for some reason that fails or is not supported, run their
shutdown() callbacks.

Cc: AceLan Kao <acelan.kao@canonical.com>
Cc: Kai-Heng Feng <kaihengf@nvidia.com>
Cc: Mark Pearson <mpearson-lenovo@squebb.ca>
Cc: Merthan Karakaş <m3rthn.k@gmail.com>
Cc: Eric Naim <dnaim@cachyos.org>
---
v5->v6:
* Fix for LKP robot issue
* Some commit message changes
* Rebase on 6.17-rc2

Mario Limonciello (AMD) (11):
PM: Introduce new PMSG_POWEROFF event
scsi: Add PM_EVENT_POWEROFF into suspend callbacks
usb: sl811-hcd: Add PM_EVENT_POWEROFF into suspend callbacks
USB: Pass PMSG_POWEROFF event to suspend_common() for poweroff with S4
flow
PCI: PM: Disable device wakeups when halting system through S4 flow
PCI: PM: Split out code from pci_pm_suspend_noirq() into helper
PCI: PM: Run bridge power up actions as part of restore phase
PCI: PM: Use pci_power_manageable() in pci_pm_poweroff_noirq()
PCI: Put PCIe bridges with downstream devices into D3 at hibernate
drm/amd: Avoid evicting resources at S5
PM: Use hibernate flows for system power off

drivers/base/power/main.c | 7 ++
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 +
drivers/pci/pci-driver.c | 99 +++++++++++++++-------
drivers/scsi/mesh.c | 1 +
drivers/scsi/stex.c | 1 +
drivers/usb/core/hcd-pci.c | 11 ++-
drivers/usb/host/sl811-hcd.c | 1 +
include/linux/pm.h | 5 +-
include/trace/events/power.h | 3 +-
kernel/reboot.c | 6 ++
10 files changed, 103 insertions(+), 35 deletions(-)

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2.43.0