linux-kernel - [PATCH v16 0/3] Avoid PCIe D3 for AMD PCIe root ports

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Message-ID: <20230829171212.156688-1-mario.limonciello@amd.com>
Date:   Tue, 29 Aug 2023 12:12:09 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <hdegoede@...hat.com>, <bhelgaas@...gle.com>, <rafael@...nel.org>,
        <Shyam-sundar.S-k@....com>
CC:     <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v16 0/3] Avoid PCIe D3 for AMD PCIe root ports

D3 on PCIe root ports isn't used on Windows systems in Modern Standby.
This series adjusts the amd-pmc driver to choose the same strategy
for Rembrandt and Phoenix platforms in Linux with s2idle.

LPS0 constraints are the basis for it; which if they are added for
Windows would also apply for Linux as well.

This version doesn't incorporate a callback, as it's pending feedback
from Bjorn if that approach is amenable.

NOTE:
This series relies upon changes that are both in linux-pm.git and
platform-x86.git. So it won't be able to apply to either maintainer's
tree until later.

Mario Limonciello (3):
  ACPI: x86: s2idle: Export symbol for fetching constraints for module
    use
  platform/x86/amd: pmc: Adjust workarounds to be part of a switch/case
  platform/x86/amd: pmc: Don't let PCIe root ports go into D3

 drivers/acpi/x86/s2idle.c          |  1 +
 drivers/platform/x86/amd/pmc/pmc.c | 56 ++++++++++++++++++++++++++----
 2 files changed, 50 insertions(+), 7 deletions(-)

-- 
2.34.1