linux-kernel - [PATCH 4.4 004/162] x86/PCI: Avoid AMD FCH XHCI USB PME# from D0 defect

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Message-Id: <20191219183157.527365032@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:31:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 4.4 004/162] x86/PCI: Avoid AMD FCH XHCI USB PME# from D0 defect

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

commit 7e8ce0e2b036dbc6617184317983aea4f2c52099 upstream.

The AMD FCH USB XHCI Controller advertises support for generating PME#
while in D0.  When in D0, it does signal PME# for USB 3.0 connect events,
but not for USB 2.0 or USB 1.1 connect events, which means the controller
doesn't wake correctly for those events.

  00:10.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller [1022:7914] (rev 20) (prog-if 30 [XHCI])
        Subsystem: Dell FCH USB XHCI Controller [1028:087e]
        Capabilities: [50] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)

Clear PCI_PM_CAP_PME_D0 in dev->pme_support to indicate the device will not
assert PME# from D0 so we don't rely on it.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203673
Link: https://lore.kernel.org/r/20190902145252.32111-1-kai.heng.feng@canonical.com
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/pci/fixup.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -542,6 +542,17 @@ static void twinhead_reserve_killing_zon
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x27B9, twinhead_reserve_killing_zone);
 
 /*
+ * Device [1022:7914]
+ * When in D0, PME# doesn't get asserted when plugging USB 2.0 device.
+ */
+static void pci_fixup_amd_fch_xhci_pme(struct pci_dev *dev)
+{
+	dev_info(&dev->dev, "PME# does not work under D0, disabling it\n");
+	dev->pme_support &= ~(PCI_PM_CAP_PME_D0 >> PCI_PM_CAP_PME_SHIFT);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x7914, pci_fixup_amd_fch_xhci_pme);
+
+/*
  * Broadwell EP Home Agent BARs erroneously return non-zero values when read.
  *
  * See http://www.intel.com/content/www/us/en/processors/xeon/xeon-e5-v4-spec-update.html