From: David Daney <david.daney@cavium.com>
To: Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org
Cc: Jon Masters <jcm@redhat.com>,
Robert Richter <robert.richter@cavium.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
David Daney <david.daney@cavium.com>
Subject: [PATCH 2/2] PCI: Avoid bus reset for Cavium cn8xxx root ports.
Date: Mon, 15 May 2017 17:17:36 -0700 [thread overview]
Message-ID: <20170516001736.4001-3-david.daney@cavium.com> (raw)
In-Reply-To: <20170516001736.4001-1-david.daney@cavium.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@cavium.com>
---
drivers/pci/quirks.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 085fb78..02cd847 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3347,6 +3347,14 @@ 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 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)
{
/*
--
2.9.4
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next prev parent reply other threads:[~2017-05-16 0:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-16 0:17 [PATCH 0/2] PCI: Workaround for bus reset on Cavium cn8xxx root ports David Daney
2017-05-16 0:17 ` [PATCH 1/2] PCI: Allow PCI_DEV_FLAGS_NO_BUS_RESET to be used on bus device David Daney
2017-05-16 20:14 ` Auger Eric
2017-05-16 0:17 ` David Daney [this message]
2017-05-16 20:14 ` [PATCH 2/2] PCI: Avoid bus reset for Cavium cn8xxx root ports Auger Eric
2017-05-16 20:29 ` David Daney
2017-05-16 20:48 ` Alex Williamson
2017-05-17 7:07 ` Joe Perches
2017-05-17 14:04 ` Jon Masters
2017-05-16 20:14 ` [PATCH 0/2] PCI: Workaround for bus reset on " Auger Eric
2017-05-23 20:47 ` Bjorn Helgaas
2017-05-23 21:04 ` Alex Williamson
2017-05-23 21:20 ` Bjorn Helgaas
2017-05-23 21:22 ` David Daney
2017-05-23 22:15 ` Alex Williamson
2017-05-30 3:30 ` Jon Masters
2017-05-30 17:32 ` Alex Williamson
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