linux-kernel - [PATCH v4 2/3] PCI: Avoid bus reset for Cavium cn8xxx root ports

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Date:   Fri,  8 Sep 2017 10:10:32 +0200
From:   Jan Glauber <jglauber@...ium.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org,
        Alex Williamson <alex.williamson@...hat.com>,
        linux-kernel@...r.kernel.org, david.daney@...ium.com,
        Jon Masters <jcm@...hat.com>,
        Robert Richter <robert.richter@...ium.com>,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        Jan Glauber <jglauber@...ium.com>
Subject: [PATCH v4 2/3] PCI: Avoid bus reset for Cavium cn8xxx root ports

From: David Daney <david.daney@...ium.com>

Root ports of cn8xxx do not function after bus reset when used with
some e1000e and LSI HBA devices. Add a quirk to prevent bus reset on
these root ports.

Signed-off-by: David Daney <david.daney@...ium.com>
[jglauber@...ium.com: fixed typo and whitespaces]
Signed-off-by: Jan Glauber <jglauber@...ium.com>
---
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 140760403f36..2e4e7b6d1a79 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3364,6 +3364,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, quirk_no_bus_reset);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003c, quirk_no_bus_reset);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0033, quirk_no_bus_reset);
 
+/*
+ * Root port on some Cavium CN8xxx chips do not successfully complete
+ * a bus reset when used with certain types of child devices. Config
+ * space access to the child may quit responding. Flag the root port
+ * as not supporting bus reset.
+ */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset);
+
 static void quirk_no_pm_reset(struct pci_dev *dev)
 {
 	/*
-- 
2.9.0.rc0.21.g7777322