From: Richard Zhu Date: Thu, 24 Feb 2022 03:06:53 +0000 (+0800) Subject: PCI: imx6: Assert i.MX8MM CLKREQ# even if no device present X-Git-Tag: v5.18-rc1~114^2~6^2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=45514f78c65cc9a09437f20e180625f94f769863;p=thirdparty%2Flinux.git PCI: imx6: Assert i.MX8MM CLKREQ# even if no device present The CLKREQ# signal is an open drain, active low signal that is driven low by the remote Endpoint device. But it might not be driven low if no Endpoint device is connected. On i.MX8MM PCIe, phy_init() may fail and system boot may hang if no Endpoint is connected to assert CLKREQ#. Handle this as on i.MX8MQ, where we explicitly assert CLKREQ# so the PHY can be initialized. Link: https://lore.kernel.org/r/1645672013-8949-1-git-send-email-hongxing.zhu@nxp.com Fixes: 178e244cb6e2 ("PCI: imx: Add the imx8mm pcie support") Signed-off-by: Richard Zhu Signed-off-by: Lorenzo Pieralisi Reviewed-by: Lucas Stach --- diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 7035c691ffcd7..6619e3caffe2d 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -453,10 +453,6 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) case IMX7D: break; case IMX8MM: - ret = clk_prepare_enable(imx6_pcie->pcie_aux); - if (ret) - dev_err(dev, "unable to enable pcie_aux clock\n"); - break; case IMX8MQ: ret = clk_prepare_enable(imx6_pcie->pcie_aux); if (ret) {