From: "Antti Järvinen" <antti.jarvinen@gmail.com>
To: helgaas@kernel.org
Cc: alex.williamson@redhat.com, antti.jarvinen@gmail.com,
bhelgaas@google.com, kishon@ti.com, kw@linux.com,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
m-karicheri2@ti.com
Subject: [PATCH v4] PCI: Add quirk for preventing bus reset on TI C667X
Date: Mon, 15 Mar 2021 10:26:06 +0000 [thread overview]
Message-ID: <20210315102606.17153-1-antti.jarvinen@gmail.com> (raw)
In-Reply-To: <20210312210917.GA2290948@bjorn-Precision-5520>
Some TI KeyStone C667X devices do not support bus/hot reset. Its PCIESS
automatically disables LTSSM when secondary bus reset is received and
device stops working. Prevent bus reset by adding quirk_no_bus_reset to
the device. With this change device can be assigned to VMs with VFIO,
but it will leak state between VMs.
Reference: https://e2e.ti.com/support/processors/f/791/t/954382
Signed-off-by: Antti Järvinen <antti.jarvinen@gmail.com>
---
drivers/pci/quirks.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 653660e3ba9e..d9201ad1ca39 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3578,6 +3578,16 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0034, quirk_no_bus_reset);
*/
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset);
+/*
+ * Some TI keystone C667X devices do no support bus/hot reset.
+ * Its PCIESS automatically disables LTSSM when secondary bus reset is
+ * received and device stops working. Prevent bus reset by adding
+ * quirk_no_bus_reset to the device. With this change device can be
+ * assigned to VMs with VFIO, but it will leak state between VMs.
+ * Reference https://e2e.ti.com/support/processors/f/791/t/954382
+ */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0xb005, quirk_no_bus_reset);
+
static void quirk_no_pm_reset(struct pci_dev *dev)
{
/*
--
2.17.1
next prev parent reply other threads:[~2021-03-15 10:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 15:36 [PATCH] PCI: quirk for preventing bus reset on TI C667X Antti Järvinen
2021-01-21 23:55 ` Bjorn Helgaas
2021-01-26 11:22 ` Antti Järvinen
2021-01-29 23:49 ` Bjorn Helgaas
2021-02-17 21:18 ` Bjorn Helgaas
2021-02-28 13:53 ` [PATCH v2] " Antti Järvinen
2021-03-07 0:22 ` Krzysztof Wilczyński
2021-03-08 14:21 ` [PATCH v3] PCI: Add " Antti Järvinen
2021-03-12 21:09 ` Bjorn Helgaas
2021-03-15 10:26 ` Antti Järvinen [this message]
2021-04-19 12:44 ` [PATCH v4] " Kishon Vijay Abraham I
2021-05-27 23:07 ` Bjorn Helgaas
2021-03-15 10:45 ` [PATCH v3] " Antti Järvinen
2021-03-08 14:28 ` [PATCH v2] PCI: " Antti Järvinen
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