[PATCH 6.19 336/844] PCI: Mark Nvidia GB10 to avoid bus reset

[Sasha Levin]

From: Johnny-CC Chang <Johnny-CC.Chang@xxxxxxxxxxxx>

[ Upstream commit c81a2ce6b6a844d1a57d2a69833a9d0f00403f00 ]

After asserting Secondary Bus Reset to downstream devices via a GB10 Root
Port, the link may not retrain correctly, e.g., the link may retrain with a
lower lane count or config accesses to downstream devices may fail.

Prevent use of Secondary Bus Reset for devices below GB10.

Signed-off-by: Johnny-CC Chang <Johnny-CC.Chang@xxxxxxxxxxxx>
[bhelgaas: drop pci_ids.h update (only used once), update commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
Link: https://patch.msgid.link/20251113084441.2124737-1-Johnny-CC.Chang@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4463a2da0441f..90676cb2fd10b 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3748,6 +3748,14 @@ static void quirk_no_bus_reset(struct pci_dev *dev)
 	dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;
 }
 
+/*
+ * After asserting Secondary Bus Reset to downstream devices via a GB10
+ * Root Port, the link may not retrain correctly.
+ * https://lore.kernel.org/r/20251113084441.2124737-1-Johnny-CC.Chang@xxxxxxxxxxxx
+ */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x22CE, quirk_no_bus_reset);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x22D0, quirk_no_bus_reset);
+
 /*
  * Some NVIDIA GPU devices do not work with bus reset, SBR needs to be
  * prevented for those affected devices.
-- 
2.51.0