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PCI: imx6: Enable the Vaux supply if available

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When the 3.3Vaux supply is present, fetch it at the probe time and keep it
enabled for the entire PCIe controller lifecycle so that the link can enter
L2 state and the devices can signal wakeup using either Beacon or WAKE#
mechanisms.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
[mani: reworded the subject, description and error message]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20250820022328.2143374-1-hongxing.zhu@nxp.com
This commit is contained in:
Richard Zhu 2025-08-20 10:23:28 +08:00 committed by Manivannan Sadhasivam
parent 8f5ae30d69
commit c221cbf8dc
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/controller/dwc/pci-imx6.c
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@ -1745,6 +1745,10 @@ static int imx_pcie_probe(struct platform_device *pdev)
pci->max_link_speed = 1;
of_property_read_u32(node, "fsl,max-link-speed", &pci->max_link_speed);
ret = devm_regulator_get_enable_optional(&pdev->dev, "vpcie3v3aux");
if (ret < 0 && ret != -ENODEV)
return dev_err_probe(dev, ret, "failed to enable Vaux supply\n");
imx_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
if (IS_ERR(imx_pcie->vpcie)) {
if (PTR_ERR(imx_pcie->vpcie) != -ENODEV)