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{
    "id": 2228789,
    "url": "http://patchwork.ozlabs.org/api/1.1/patches/2228789/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260427115804.134231-1-smoch@web.de/",
    "project": {
        "id": 28,
        "url": "http://patchwork.ozlabs.org/api/1.1/projects/28/?format=api",
        "name": "Linux PCI development",
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    "msgid": "<20260427115804.134231-1-smoch@web.de>",
    "date": "2026-04-27T11:58:04",
    "name": "PCI: imx6: Keep Root Port MSI capability also for i.MX6Q",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "d6262b0aa656ad183b2e31ed1a0714e27229dc6e",
    "submitter": {
        "id": 64995,
        "url": "http://patchwork.ozlabs.org/api/1.1/people/64995/?format=api",
        "name": "Soeren Moch",
        "email": "smoch@web.de"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260427115804.134231-1-smoch@web.de/mbox/",
    "series": [
        {
            "id": 501634,
            "url": "http://patchwork.ozlabs.org/api/1.1/series/501634/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=501634",
            "date": "2026-04-27T11:58:04",
            "name": "PCI: imx6: Keep Root Port MSI capability also for i.MX6Q",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/501634/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2228789/comments/",
    "check": "pending",
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    "tags": {},
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        "From": "Soeren Moch <smoch@web.de>",
        "To": "Richard Zhu <hongxing.zhu@nxp.com>",
        "Cc": "Soeren Moch <smoch@web.de>,\n\tstable@vger.kernel.org,\n\tManivannan Sadhasivam <mani@kernel.org>,\n\tLucas Stach <l.stach@pengutronix.de>,\n\tBjorn Helgaas <bhelgaas@google.com>,\n\tFrank Li <Frank.Li@nxp.com>,\n\tFabio Estevam <festevam@gmail.com>,\n\tlinux-pci@vger.kernel.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\timx@lists.linux.dev,\n\tlinux-kernel@vger.kernel.org",
        "Subject": "[PATCH] PCI: imx6: Keep Root Port MSI capability also for i.MX6Q",
        "Date": "Mon, 27 Apr 2026 13:58:04 +0200",
        "Message-ID": "<20260427115804.134231-1-smoch@web.de>",
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xnvl9ce3N/352BQ=="
    },
    "content": "Also on the NXP i.MX6Q chipset MSIs from the endpoints won't be received by\nthe iMSI-RX MSI controller if the Root Port MSI capability is disabled.\n\nEven though the Root Port MSIs won't be received by the iMSI-RX controller\ndue to design, this chipset has some weird hardware bug that prevents\nthe endpoint MSIs from reaching when the Root Port MSI capability is\ndisabled.\n\nHence, always keep the Root Port MSI capability for this chipset.\n\nNote that by keeping Root Port MSI capability, Root Port MSIs such as AER,\nPME and others won't be received by default. So users need to use\nworkarounds such as passing 'pcie_pme=nomsi' cmdline param.\n\nFixes: 3a4e8302e72f (\"PCI: imx6: Keep Root Port MSI capability with iMSI-RX to work around hardware bug\")\nCc: <stable@vger.kernel.org> # 7.0.x\nSigned-off-by: Soeren Moch <smoch@web.de>\n---\nCc: Manivannan Sadhasivam <mani@kernel.org>\nCc: Richard Zhu <hongxing.zhu@nxp.com>\nCc: Lucas Stach <l.stach@pengutronix.de>\nCc: Bjorn Helgaas <bhelgaas@google.com>\nCc: Frank Li <Frank.Li@nxp.com>\nCc: Fabio Estevam <festevam@gmail.com>\nCc: linux-pci@vger.kernel.org\nCc: linux-arm-kernel@lists.infradead.org\nCc: imx@lists.linux.dev\nCc: linux-kernel@vger.kernel.org\n\nTested on a tbs2910 board [1]\n[1] arch/arm/boot/dts/nxp/imx/imx6q-tbs2910.dts\n---\n drivers/pci/controller/dwc/pci-imx6.c | 3 ++-\n 1 file changed, 2 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c\nindex 6d6a1688e7eb..3d461bdef967 100644\n--- a/drivers/pci/controller/dwc/pci-imx6.c\n+++ b/drivers/pci/controller/dwc/pci-imx6.c\n@@ -1865,7 +1865,8 @@ static const struct imx_pcie_drvdata drvdata[] = {\n \t\t.flags = IMX_PCIE_FLAG_IMX_PHY |\n \t\t\t IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |\n \t\t\t IMX_PCIE_FLAG_BROKEN_SUSPEND |\n-\t\t\t IMX_PCIE_FLAG_SUPPORTS_SUSPEND,\n+\t\t\t IMX_PCIE_FLAG_SUPPORTS_SUSPEND |\n+\t\t\t IMX_PCIE_FLAG_KEEP_MSI_CAP,\n \t\t.dbi_length = 0x200,\n \t\t.gpr = \"fsl,imx6q-iomuxc-gpr\",\n \t\t.ltssm_off = IOMUXC_GPR12,\n",
    "prefixes": []
}