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Subject[PATCH 4/8] PCI: Add quirk to disable MSI support for Amazon's Annapurna Labs host bridge
Date
On some platforms, the host bridge exposes an MSI-X capability but
doesn't actually support it.
This causes a crash during initialization by the pcieport driver, since
it tries to configure the MSI-X capability.

Signed-off-by: Jonathan Chocron <jonnyc@amazon.com>
---
drivers/pci/quirks.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 11850b030637..0fb70d755977 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2925,6 +2925,14 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0x10a1,
quirk_msi_intx_disable_qca_bug);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0xe091,
quirk_msi_intx_disable_qca_bug);
+
+static void quirk_al_msi_disable(struct pci_dev *dev)
+{
+ dev->no_msi = 1;
+ dev_warn(&dev->dev, "Annapurna Labs pcie quirk - disabling MSI\n");
+}
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
+ PCI_CLASS_BRIDGE_PCI, 8, quirk_al_msi_disable);
#endif /* CONFIG_PCI_MSI */

/*
--
2.17.1

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