Commit 06dc4ee5 authored Oct 12, 2017 by Hou Zhiqiang Committed by Bjorn Helgaas Oct 20, 2017

PCI: Disable MSI for Freescale Layerscape PCIe RC mode



The Freescale PCIe controller advertises the MSI/MSI-X capability in both
RC and Endpoint mode, but in RC mode it doesn't support MSI/MSI-X by
itself; it can only transfer MSI/MSI-X from downstream devices.

Add a quirk to prevent use of MSI/MSI-X in RC mode.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Minghuan Lian <minghuan.Lian@nxp.com>

parent 0c6b93d2

drivers/pci/quirks.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -4799,3 +4799,11 @@ static void quirk_no_ats(struct pci_dev *pdev)
		/* AMD Stoney platform GPU */
		DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_no_ats);
		#endif /* CONFIG_PCI_ATS */

		/* Freescale PCIe doesn't support MSI in RC mode */
		static void quirk_fsl_no_msi(struct pci_dev *pdev)
		{
		if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
		pdev->no_msi = 1;
		}
		DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, quirk_fsl_no_msi);

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