[PATCH v6 09/11] PCI: imx6: Add a new imx8mm_pcie_clkreq_override() for i.MX8M PCIes

Richard Zhu
2025-10-15T03:05:58Z

Add a new imx8mm_pcie_clkreq_override() for i.MX8M PCIes. Pave the path
to support L1 PM Substates after clear CLKREQ# override. No function
changes.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
drivers/pci/controller/dwc/pci-imx6.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 4668fc9648bff..a60fe7c337e08 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -685,7 +685,7 @@ static int imx6q_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
return 0;
}

-static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
+static void imx8mm_pcie_clkreq_override(struct imx_pcie *imx_pcie, bool enable)
{
int offset = imx_pcie_grp_offset(imx_pcie);

@@ -695,6 +695,11 @@ static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
enable ? IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN : 0);
+}
+
+static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
+{
+ imx8mm_pcie_clkreq_override(imx_pcie, enable);
return 0;
}

--
2.37.1