[{"id":3683069,"web_url":"http://patchwork.ozlabs.org/comment/3683069/","msgid":"","list_archive_url":null,"date":"2026-04-28T02:19:13","subject":"RE: [PATCH] PCI: imx6: Keep Root Port MSI capability also for i.MX6Q","submitter":{"id":68324,"url":"http://patchwork.ozlabs.org/api/people/68324/","name":"Hongxing Zhu","email":"hongxing.zhu@nxp.com"},"content":"> -----Original Message-----\n> From: Soeren Moch \n> Sent: Monday, April 27, 2026 7:58 PM\n> To: Hongxing Zhu \n> Cc: Soeren Moch ; stable@vger.kernel.org; Manivannan\n> Sadhasivam ; Lucas Stach ; Bjorn\n> Helgaas ; Frank Li ; Fabio Estevam\n> ; linux-pci@vger.kernel.org; linux-arm-\n> kernel@lists.infradead.org; imx@lists.linux.dev; linux-kernel@vger.kernel.org\n> Subject: [PATCH] PCI: imx6: Keep Root Port MSI capability also for i.MX6Q\n> \n> [You don't often get email from smoch@web.de. Learn why this is important at\n> https://aka.ms/LearnAboutSenderIdentification ]\n> \n> Also on the NXP i.MX6Q chipset MSIs from the endpoints won't be received by\n> the iMSI-RX MSI controller if the Root Port MSI capability is disabled.\n> \n> Even though the Root Port MSIs won't be received by the iMSI-RX controller due\n> to design, this chipset has some weird hardware bug that prevents the endpoint\n> MSIs from reaching when the Root Port MSI capability is disabled.\n> \n> Hence, always keep the Root Port MSI capability for this chipset.\n> \n> Note that by keeping Root Port MSI capability, Root Port MSIs such as AER, PME\n> and others won't be received by default. So users need to use workarounds such\n> as passing 'pcie_pme=nomsi' cmdline param.\n> \n> Fixes: 3a4e8302e72f (\"PCI: imx6: Keep Root Port MSI capability with iMSI-RX to\n> work around hardware bug\")\n> Cc: # 7.0.x\n> Signed-off-by: Soeren Moch \nAcked-by: Richard Zhu \n\nBest Regards\nRichard Zhu\n> ---\n> Cc: Manivannan Sadhasivam \n> Cc: Richard Zhu \n> Cc: Lucas Stach \n> Cc: Bjorn Helgaas \n> Cc: Frank Li \n> Cc: Fabio Estevam \n> Cc: linux-pci@vger.kernel.org\n> Cc: linux-arm-kernel@lists.infradead.org\n> Cc: imx@lists.linux.dev\n> Cc: linux-kernel@vger.kernel.org\n> \n> Tested 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(-)\n> \n> diff --git a/drivers/pci/controller/dwc/pci-imx6.c\n> b/drivers/pci/controller/dwc/pci-imx6.c\n> index 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> .flags = IMX_PCIE_FLAG_IMX_PHY |\n> IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |\n> IMX_PCIE_FLAG_BROKEN_SUSPEND |\n> - IMX_PCIE_FLAG_SUPPORTS_SUSPEND,\n> + IMX_PCIE_FLAG_SUPPORTS_SUSPEND |\n> + IMX_PCIE_FLAG_KEEP_MSI_CAP,\n> .dbi_length = 0x200,\n> .gpr = \"fsl,imx6q-iomuxc-gpr\",\n> .ltssm_off = IOMUXC_GPR12,\n> --\n> 2.43.0","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256\n header.s=selector1 header.b=X1nUwtrf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"quoted-printable","Precedence":"bulk","X-Mailing-List":"linux-pci@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","X-OriginatorOrg":"nxp.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-AuthSource":"AM0PR04MB5220.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-Network-Message-Id":"\n 9862cb08-a3d4-4f0c-4a79-08dea4cc8a50","X-MS-Exchange-CrossTenant-originalarrivaltime":"28 Apr 2026 02:19:13.3610\n (UTC)","X-MS-Exchange-CrossTenant-fromentityheader":"Hosted","X-MS-Exchange-CrossTenant-id":"686ea1d3-bc2b-4c6f-a92c-d99c5c301635","X-MS-Exchange-CrossTenant-mailboxtype":"HOSTED","X-MS-Exchange-CrossTenant-userprincipalname":"\n RYcHkHceBSAZmH1zuw7MdQleYZ7w0co8w7SVRXf6PMm4z1aBoRDrMEcupqoGVY580COMxD/ej+YrbJ4VqrqrhA==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"DB9PR04MB8495"}},{"id":3684903,"web_url":"http://patchwork.ozlabs.org/comment/3684903/","msgid":"","list_archive_url":null,"date":"2026-04-30T18:53:01","subject":"Re: [PATCH] PCI: imx6: Keep Root Port MSI capability also for i.MX6Q","submitter":{"id":68011,"url":"http://patchwork.ozlabs.org/api/people/68011/","name":"Frank Li","email":"Frank.Li@nxp.com"},"content":"On Mon, Apr 27, 2026 at 01:58:04PM +0200, Soeren Moch wrote:\n> Also on the NXP i.MX6Q chipset MSIs from the endpoints won't be received by\n> the iMSI-RX MSI controller if the Root Port MSI capability is disabled.\n>\n> Even though the Root Port MSIs won't be received by the iMSI-RX controller\n> due to design, this chipset has some weird hardware bug that prevents\n> the endpoint MSIs from reaching when the Root Port MSI capability is\n> disabled.\n>\n> Hence, always keep the Root Port MSI capability for this chipset.\n>\n> Note that by keeping Root Port MSI capability, Root Port MSIs such as AER,\n> PME and others won't be received by default. So users need to use\n> workarounds such as passing 'pcie_pme=nomsi' cmdline param.\n>\n> Fixes: 3a4e8302e72f (\"PCI: imx6: Keep Root Port MSI capability with iMSI-RX to work around hardware bug\")\n> Cc: # 7.0.x\n> Signed-off-by: Soeren Moch \n\nReviewed-by: Frank Li \n\n> ---\n> Cc: Manivannan Sadhasivam \n> Cc: Richard Zhu \n> Cc: Lucas Stach \n> Cc: Bjorn Helgaas \n> Cc: Frank Li \n> Cc: Fabio Estevam \n> Cc: linux-pci@vger.kernel.org\n> Cc: linux-arm-kernel@lists.infradead.org\n> Cc: imx@lists.linux.dev\n> Cc: linux-kernel@vger.kernel.org\n>\n> Tested 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(-)\n>\n> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c\n> index 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> --\n> 2.43.0\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256\n header.s=selector1 header.b=DoDdQhm8;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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dkim=pass\n header.d=nxp.com; arc=none"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=wYBHNahT27Jx06dtM0vYMNdM+egDd/5dCiDmrJKUfYA=;\n b=DoDdQhm87bn/kOfAEBlh7nS4asniOaR9JKBekPpU73LDQJi3XfIoXTMFTd19G66U6cVRckqi2Fns/gPQU3+cVrm4YIeiPic50hN7RfglmFoiq1rXp7ezZBAaaN4buy8ISj1x4Tv0HJYAUjvHY4tmZgQJAZbgiogCey8yyeI0nd1n8Q99Nz3FAur8UPrdB/z9EX9zi0pZb3dT82IOWV2KjHev/jr3RnfHUfTs3qjSVqAeAwGgGbPpXIckiP6knr1maXzclU8ltZI+D2YOUZCvISdLpT6F36ZshiMXE3wCbUo1+WecQLig3x48jRWRekaz7CF/6euv/MV2pna1y7Hdtw==","Date":"Thu, 30 Apr 2026 14:53:01 -0400","From":"Frank Li ","To":"Soeren Moch ","Cc":"Richard Zhu , stable@vger.kernel.org,\n\tManivannan Sadhasivam ,\n\tLucas Stach ,\n\tBjorn Helgaas ,\n\tFabio Estevam , linux-pci@vger.kernel.org,\n\tlinux-arm-kernel@lists.infradead.org, imx@lists.linux.dev,\n\tlinux-kernel@vger.kernel.org","Subject":"Re: [PATCH] PCI: imx6: Keep Root Port MSI capability also for i.MX6Q","Message-ID":"","References":"<20260427115804.134231-1-smoch@web.de>","Content-Type":"text/plain; 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