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charset="utf-8" The i.MX95 PCIe controller introduces three dedicated hardware interrupt lines: - intr: general controller events - aer: Advanced Error Reporting - pme: Power Management Events Earlier i.MX PCIe variants (imx6q, imx6sx, imx6qp, imx7d, imx8mm, imx8mp, imx8mq, imx8q) do not have these dedicated interrupt lines. PCIe basic functionality (enumeration, configuration, and data transfer) works correctly regardless of whether these interrupts are present. Mark these interrupts as optional to maintain backward compatibility with SoCs that lack these hardware interrupt lines. Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Do= cumentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml index 9d1349855b42..cf709132ff1e 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml @@ -58,12 +58,18 @@ properties: items: - description: builtin MSI controller. - description: builtin DMA controller. + - description: PCIe event interrupt. + - description: builtin AER SPI standalone interrupt line. + - description: builtin PME SPI standalone interrupt line. =20 interrupt-names: minItems: 1 items: - const: msi - const: dma + - const: intr + - const: aer + - const: pme =20 reset-gpio: description: Should specify the GPIO for controlling the PCI bus device --=20 2.37.1 From nobody Sun May 24 21:39:21 2026 Received: from DU2PR03CU002.outbound.protection.outlook.com (mail-northeuropeazon11011041.outbound.protection.outlook.com [52.101.65.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 69B2F377ED2; 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charset="utf-8" The current PCIe device tree configuration only defines the MSI interrupt, which is sufficient for basic PCIe operation but limits advanced functionality. Add the following interrupt lines to pcie0 and pcie1 nodes: - dma: DMA interrupt for PCIe DMA operations - intr: General controller events and link state changes - aer: Advanced Error Reporting interrupt - pme: Power Management Event interrupt This enables enhanced PCIe features and capabilities that were previously unavailable due to missing interrupt definitions. Signed-off-by: Richard Zhu --- arch/arm64/boot/dts/freescale/imx95.dtsi | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx95.dtsi b/arch/arm64/boot/dts= /freescale/imx95.dtsi index adcc0e1d3696..f40388958717 100644 --- a/arch/arm64/boot/dts/freescale/imx95.dtsi +++ b/arch/arm64/boot/dts/freescale/imx95.dtsi @@ -1948,8 +1948,12 @@ pcie0: pcie@4c300000 { bus-range =3D <0x00 0xff>; num-lanes =3D <1>; num-viewport =3D <8>; - interrupts =3D ; - interrupt-names =3D "msi"; + interrupts =3D , + , + , + , + ; + interrupt-names =3D "msi", "dma", "intr", "aer", "pme"; #interrupt-cells =3D <1>; interrupt-map-mask =3D <0 0 0 0x7>; interrupt-map =3D <0 0 0 1 &gic 0 0 GIC_SPI 306 IRQ_TYPE_LEVEL_HIGH>, @@ -2023,8 +2027,12 @@ pcie1: pcie@4c380000 { bus-range =3D <0x00 0xff>; num-lanes =3D <1>; num-viewport =3D <8>; - interrupts =3D ; - interrupt-names =3D "msi"; + interrupts =3D , + , + , + , + ; + interrupt-names =3D "msi", "dma", "intr", "aer", "pme"; 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charset="utf-8" The PCIe link can go down due to various unexpected circumstances. Add root port reset support to enable link recovery for the i.MX PCIe controller when the optional "intr" interrupt is present. Reset root port to uninitialize, initialize the PCIe controller, and restart the PCIe link at end when a link down event happens. On i.MX95 platforms, link events and PME share the same interrupt line. The link event interrupt cannot use a threaded-only IRQ handler because the PME driver uses request_irq() with only the IRQF_SHARED flag set, which requires a primary handler. To handle this shared interrupt scenario, register a primary interrupt handler with IRQF_SHARED for link events and manipulate the link event enable bits to ensure the shared interrupt source triggers only one handler at a time. Signed-off-by: Richard Zhu --- drivers/pci/controller/dwc/pci-imx6.c | 124 ++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index 1034ac5c5f5c..c286581bede8 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -34,6 +34,7 @@ #include =20 #include "../../pci.h" +#include "../pci-host-common.h" #include "pcie-designware.h" =20 #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9) @@ -78,6 +79,10 @@ #define IMX95_SID_MASK GENMASK(5, 0) #define IMX95_MAX_LUT 32 =20 +#define IMX95_LINK_INT_CTRL_STS 0x1040 +#define IMX95_LINK_DOWN_INT_STS BIT(11) +#define IMX95_LINK_DOWN_INT_EN BIT(10) + #define IMX95_PCIE_RST_CTRL 0x3010 #define IMX95_PCIE_COLD_RST BIT(0) =20 @@ -125,6 +130,8 @@ enum imx_pcie_variants { #define IMX_PCIE_MAX_INSTANCES 2 =20 struct imx_pcie; +static int imx_pcie_reset_root_port(struct pci_host_bridge *bridge, + struct pci_dev *pdev); =20 struct imx_pcie_drvdata { enum imx_pcie_variants variant; @@ -158,6 +165,7 @@ struct imx_pcie { bool supports_clkreq; bool enable_ext_refclk; struct regmap *iomuxc_gpr; + u32 lnk_intr; u16 msi_ctrl; u32 controller_id; struct reset_control *pciephy_reset; @@ -1301,6 +1309,13 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp) =20 imx_setup_phy_mpll(imx_pcie); =20 + /* + * Callback invoked by PCI core when link down is detected and + * recovery is needed. + */ + if (pp->bridge) + pp->bridge->reset_root_port =3D imx_pcie_reset_root_port; + return 0; =20 err_phy_off: @@ -1568,6 +1583,9 @@ static int imx_pcie_suspend_noirq(struct device *dev) if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_SUPPORTS_SUSPEND)) return 0; =20 + if (imx_pcie->lnk_intr) + regmap_clear_bits(imx_pcie->iomuxc_gpr, IMX95_LINK_INT_CTRL_STS, + IMX95_LINK_DOWN_INT_EN); imx_pcie_msi_save_restore(imx_pcie, true); if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) imx_pcie_lut_save(imx_pcie); @@ -1618,6 +1636,9 @@ static int imx_pcie_resume_noirq(struct device *dev) if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) imx_pcie_lut_restore(imx_pcie); imx_pcie_msi_save_restore(imx_pcie, false); + if (imx_pcie->lnk_intr) + regmap_set_bits(imx_pcie->iomuxc_gpr, IMX95_LINK_INT_CTRL_STS, + IMX95_LINK_DOWN_INT_EN); =20 return 0; } @@ -1627,6 +1648,85 @@ static const struct dev_pm_ops imx_pcie_pm_ops =3D { imx_pcie_resume_noirq) }; =20 +static irqreturn_t imx_pcie_lnk_irq_isr(int irq, void *priv) +{ + struct imx_pcie *imx_pcie =3D priv; + struct dw_pcie *pci =3D imx_pcie->pci; + struct device *dev =3D pci->dev; + u32 val; + + regmap_read(imx_pcie->iomuxc_gpr, IMX95_LINK_INT_CTRL_STS, &val); + if (val & IMX95_LINK_DOWN_INT_STS) { + dev_dbg(dev, "PCIe link down detected, initiating recovery\n"); + regmap_clear_bits(imx_pcie->iomuxc_gpr, IMX95_LINK_INT_CTRL_STS, + IMX95_LINK_DOWN_INT_EN); + /* Clear link down interrupt status by writing 1b'1 to it */ + regmap_set_bits(imx_pcie->iomuxc_gpr, IMX95_LINK_INT_CTRL_STS, + IMX95_LINK_DOWN_INT_STS); + + return IRQ_WAKE_THREAD; + } else { + return IRQ_NONE; + } +} + +static irqreturn_t imx_pcie_lnk_irq_thread(int irq, void *priv) +{ + struct imx_pcie *imx_pcie =3D priv; + struct dw_pcie *pci =3D imx_pcie->pci; + struct dw_pcie_rp *pp =3D &pci->pp; + struct pci_dev *port; + + for_each_pci_bridge(port, pp->bridge->bus) + if (pci_pcie_type(port) =3D=3D PCI_EXP_TYPE_ROOT_PORT) + pci_host_handle_link_down(port); + + regmap_set_bits(imx_pcie->iomuxc_gpr, IMX95_LINK_INT_CTRL_STS, + IMX95_LINK_DOWN_INT_EN); + + return IRQ_HANDLED; +} + +static int imx_pcie_reset_root_port(struct pci_host_bridge *bridge, + struct pci_dev *pdev) +{ + struct pci_bus *bus =3D bridge->bus; + struct dw_pcie_rp *pp =3D bus->sysdata; + struct dw_pcie *pci =3D to_dw_pcie_from_pp(pp); + struct imx_pcie *imx_pcie =3D to_imx_pcie(pci); + int ret; + + imx_pcie_msi_save_restore(imx_pcie, true); + if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) + imx_pcie_lut_save(imx_pcie); + imx_pcie_stop_link(pci); + imx_pcie_host_exit(pp); + + ret =3D imx_pcie_host_init(pp); + if (ret) { + dev_err(pci->dev, "Failed to re-init PCIe\n"); + return ret; + } + ret =3D dw_pcie_setup_rc(pp); + if (ret) + goto err_host_deinit; + + imx_pcie_start_link(pci); + dw_pcie_wait_for_link(pci); + + if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) + imx_pcie_lut_restore(imx_pcie); + imx_pcie_msi_save_restore(imx_pcie, false); + + dev_dbg(pci->dev, "Root port reset completed\n"); + return 0; + +err_host_deinit: + imx_pcie_host_exit(pp); + + return ret; +} + static int imx_pcie_probe(struct platform_device *pdev) { struct device *dev =3D &pdev->dev; @@ -1829,9 +1929,33 @@ static int imx_pcie_probe(struct platform_device *pd= ev) val |=3D PCI_MSI_FLAGS_ENABLE; dw_pcie_writew_dbi(pci, offset + PCI_MSI_FLAGS, val); } + + /* Get link event irq if it is present */ + imx_pcie->lnk_intr =3D platform_get_irq_byname(pdev, "intr"); + if (imx_pcie->lnk_intr > 0) { + ret =3D devm_request_threaded_irq(dev, imx_pcie->lnk_intr, + imx_pcie_lnk_irq_isr, + imx_pcie_lnk_irq_thread, + IRQF_SHARED, + "lnk", imx_pcie); + if (ret) { + dev_err_probe(dev, ret, + "unable to request LNK IRQ\n"); + goto err_host_deinit; + } + + regmap_set_bits(imx_pcie->iomuxc_gpr, + IMX95_LINK_INT_CTRL_STS, + IMX95_LINK_DOWN_INT_EN); + } } =20 return 0; + +err_host_deinit: + dw_pcie_host_deinit(&pci->pp); + + return ret; } =20 static void imx_pcie_shutdown(struct platform_device *pdev) --=20 2.37.1