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authorAntti Järvinen <antti.jarvinen@gmail.com>2021-03-15 10:26:06 +0000
committerBjorn Helgaas <bhelgaas@google.com>2021-06-18 10:32:35 -0500
commitb5cf198e74a91073d12839a3e2db99994a39995d (patch)
tree5500035f787a30f717fa667d6db8b4f16442b6cd /drivers
parenta512360f45c930e14a262056e5f742797bc5d3f2 (diff)
PCI: Mark TI C667X to avoid bus reset
Some TI KeyStone C667X devices do not support bus/hot reset. The PCIESS automatically disables LTSSM when Secondary Bus Reset is received and device stops working. Prevent bus reset for these devices. With this change, the 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 Link: https://lore.kernel.org/r/20210315102606.17153-1-antti.jarvinen@gmail.com Signed-off-by: Antti Järvinen <antti.jarvinen@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/quirks.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index dcb229de1acb..de0c110029f3 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3566,6 +3566,16 @@ 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 not support bus/hot reset. The PCIESS
+ * automatically disables LTSSM when Secondary Bus Reset is received and
+ * the device stops working. Prevent bus reset for these devices. With
+ * this change, the 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)
{
/*