linux-kernel - [PATCH 1/2] PCI: Disable MSI for Freescale PCIe RC mode

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Date:   Fri, 22 Sep 2017 15:25:21 +0800
From:   Zhiqiang Hou <Zhiqiang.Hou@....com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-pci@...r.kernel.org>, <bhelgaas@...gle.com>,
        <roy.zang@....com>, <mingkai.hu@....com>, <minghuan.lian@....com>
CC:     Hou Zhiqiang <Zhiqiang.Hou@....com>
Subject: [PATCH 1/2] PCI: Disable MSI for Freescale PCIe RC mode

From: Hou Zhiqiang <Zhiqiang.Hou@....com>

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 it self, it can only transfer MSI/MSI-X from downstream
devices. So add this quirk to prevent use of MSI/MSI-X in RC mode.

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

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);
-- 
2.14.1