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    Subject[PATCH 5.9 209/391] PCI/ACPI: Whitelist hotplug ports for D3 if power managed by ACPI
    Date
    From: Lukas Wunner <lukas@wunner.de>

    commit c6e331312ebfb52b7186e5d82d517d68b4d2f2d8 upstream.

    Recent laptops with dual AMD GPUs fail to suspend the discrete GPU, thus
    causing lockups on system sleep and high power consumption at runtime.
    The discrete GPU would normally be suspended to D3cold by turning off
    ACPI _PR3 Power Resources of the Root Port above the GPU.

    However on affected systems, the Root Port is hotplug-capable and
    pci_bridge_d3_possible() only allows hotplug ports to go to D3 if they
    belong to a Thunderbolt device or if the Root Port possesses a
    "HotPlugSupportInD3" ACPI property. Neither is the case on affected
    laptops. The reason for whitelisting only specific, known to work
    hotplug ports for D3 is that there have been reports of SkyLake Xeon-SP
    systems raising Hardware Error NMIs upon suspending their hotplug ports:
    https://lore.kernel.org/linux-pci/20170503180426.GA4058@otc-nc-03/

    But if a hotplug port is power manageable by ACPI (as can be detected
    through presence of Power Resources and corresponding _PS0 and _PS3
    methods) then it ought to be safe to suspend it to D3. To this end,
    amend acpi_pci_bridge_d3() to whitelist such ports for D3.

    Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1222
    Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1252
    Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1304
    Reported-and-tested-by: Arthur Borsboom <arthurborsboom@gmail.com>
    Reported-and-tested-by: matoro <matoro@airmail.cc>
    Reported-by: Aaron Zakhrov <aaron.zakhrov@gmail.com>
    Reported-by: Michal Rostecki <mrostecki@suse.com>
    Reported-by: Shai Coleman <git@shaicoleman.com>
    Signed-off-by: Lukas Wunner <lukas@wunner.de>
    Acked-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/pci/pci-acpi.c | 10 ++++++++++
    1 file changed, 10 insertions(+)

    --- a/drivers/pci/pci-acpi.c
    +++ b/drivers/pci/pci-acpi.c
    @@ -944,6 +944,16 @@ static bool acpi_pci_bridge_d3(struct pc
    if (!dev->is_hotplug_bridge)
    return false;

    + /* Assume D3 support if the bridge is power-manageable by ACPI. */
    + adev = ACPI_COMPANION(&dev->dev);
    + if (!adev && !pci_dev_is_added(dev)) {
    + adev = acpi_pci_find_companion(&dev->dev);
    + ACPI_COMPANION_SET(&dev->dev, adev);
    + }
    +
    + if (adev && acpi_device_power_manageable(adev))
    + return true;
    +
    /*
    * Look for a special _DSD property for the root port and if it
    * is set we know the hierarchy behind it supports D3 just fine.

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