linux-kernel - [RFC 0/3] Enable runtime PM more broadly

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Message-ID: <20221004041225.1462336-1-mario.limonciello@amd.com>
Date:   Mon, 3 Oct 2022 23:12:22 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:     "open list:THUNDERBOLT DRIVER" <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <Sanju.Mehta@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [RFC 0/3] Enable runtime PM more broadly

Currently every time a vendor introduces a new USB4 controller changes
need to be made in xhci-pci to add the PCI IDs representing the XHCI
controller used for tunneling.

Due to low power management needs every single integrated Intel and
AMD controller have needed to be added.  As we already know which
controller is used for tunneling by the device links specified in
ACPI tables, this is a very good heuristic.

This series uses that as a heuristic, pulls out all the IDs added to
xhci-pci and then adds the new IDs for those *not* used for tunneling
on AMD's Pink Sardine (those are covered by patch 1/3 in this RFC).

If 1/3 and 2/3 are not agreeable, then instead patch 3/3 can be re-spun
to explicitly add the PCI IDs used for the XHCI controller used for
tunneling on AMD's Pink Sardine.

Mario Limonciello (3):
  thunderbolt: Allow XHCI device links to enter runtime pm
  xhci-pci: Remove a number of controllers from the runtime PM allowlist
  xhci-pci: Allow host runtime PM as default for AMD Pink Sardine

 drivers/thunderbolt/acpi.c  |  3 +++
 drivers/usb/host/xhci-pci.c | 26 +++++++-------------------
 2 files changed, 10 insertions(+), 19 deletions(-)

-- 
2.34.1