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charset="utf-8" From: Richard Zhu Enable runtime PM support for i.MX95 PCIe Root Complex to allow dynamic power management when the PCIe link is idle. The i.MX95 PCIe controller supports entering D3hot state when PCIe devices are not actively in use. This implementation uses pm_runtime_no_callbacks() to leverage the PCI core's generic runtime PM handling. The PCI core automatically manages D-state transitions based on the runtime PM state of connected endpoint devices. Signed-off-by: Richard Zhu --- I'm not sure the previous v2 patch is sent out properly or not. Resend it. Previous v2 https://lore.kernel.org/imx/20260708035928.580236-1-hongxing.zhu@oss.nxp.co= m/ Changes in v2: Use devm_pm_runtime_set_active_enabled() simplify the codes and error path. --- drivers/pci/controller/dwc/pci-imx6.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index fadf14de10f7c..9a574c7dd74fa 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -132,6 +132,7 @@ enum imx_pcie_variants { #define IMX_PCIE_FLAG_SKIP_L23_READY BIT(12) /* Preserve MSI capability for platforms that require it */ #define IMX_PCIE_FLAG_KEEP_MSI_CAP BIT(13) +#define IMX_PCIE_FLAG_PM_RUNTIME BIT(14) =20 #define imx_check_flag(pci, val) (pci->drvdata->flags & val) =20 @@ -1978,6 +1979,13 @@ static int imx_pcie_probe(struct platform_device *pd= ev) */ imx_pcie_add_lut_by_rid(imx_pcie, 0); } else { + if (imx_pcie->drvdata->flags & IMX_PCIE_FLAG_PM_RUNTIME) { + pm_runtime_no_callbacks(dev); + ret =3D devm_pm_runtime_set_active_enabled(dev); + if (ret < 0) + return ret; + } + /* * i.MX RC is powered off during suspend, force L2 entry to * ensure proper endpoint notification before power loss. @@ -2126,6 +2134,7 @@ static const struct imx_pcie_drvdata drvdata[] =3D { .flags =3D IMX_PCIE_FLAG_HAS_SERDES | IMX_PCIE_FLAG_HAS_LUT | IMX_PCIE_FLAG_8GT_ECN_ERR051586 | + IMX_PCIE_FLAG_PM_RUNTIME | IMX_PCIE_FLAG_SUPPORTS_SUSPEND, .ltssm_off =3D IMX95_PE0_GEN_CTRL_3, .ltssm_mask =3D IMX95_PCIE_LTSSM_EN, --=20 2.34.1