linux-kernel - [PATCH 0/2] Improvements to system power consumption at S5

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Message-ID: <20231213182656.6165-1-mario.limonciello@amd.com>
Date:   Wed, 13 Dec 2023 12:26:54 -0600
From:   Mario Limonciello <mario.limonciello@....com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
CC:     <linux-pci@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>,
        <mpearson-lenovo@...ebb.ca>
Subject: [PATCH 0/2] Improvements to system power consumption at S5

OEM systems that ship with Linux preloaded need to go through energy
certifications that match regulatory bodies in the regions that they
will ship.

If any of those certifications don't pass then OEMs might not be able
to ship systems preloaded in applicable regions.

Multiple models of systems are reported to fail in Linux but pass
for Windows on the exact same hardware.

By looking at a breakdown of power consumption across devices the
issue is that some devices aren't turned off when user puts the
system into S5.

This series modifies the PCI driver and PCIe port shutdown
codepaths to ensure that devices aren't needlessly woken up and
that the hierarchy for all ports is put into D3cold.

With this series power consumption at S5 drops on some affected
systems to ranges that should be acceptable to ship preloaded.

Cc: mpearson-lenovo@...ebb.ca

Mario Limonciello (2):
  PCI: Avoid runtime resuming devices if system is shutting down
  PCI/portdrv: Place PCIe port hierarchy into D3cold at shutdown

 drivers/pci/pci-driver.c   |  4 +++-
 drivers/pci/pcie/portdrv.c | 11 ++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)

-- 
2.34.1