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authorHou Zhiqiang <Zhiqiang.Hou@nxp.com>2017-10-12 12:44:47 +0300
committerBjorn Helgaas <bhelgaas@google.com>2017-10-20 21:25:03 +0300
commit06dc4ee54e306eff61cbdac3593b42b09f618103 (patch)
tree9459bff1da8b281624ec0f269bd4c12174c435ec /drivers/pci/quirks.c
parent0c6b93d2b3cf6eb46c3c916a44caef112db36628 (diff)
downloadlinux-06dc4ee54e306eff61cbdac3593b42b09f618103.tar.xz
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>
Diffstat (limited to 'drivers/pci/quirks.c')
-rw-r--r--drivers/pci/quirks.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index a4d33619a7bb..c1063a420f0c 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -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);