PCI: imx6: Initialize PHY before deasserting core reset

When the PHY is the reference clock provider then it must be initialized
and powered on before the reset on the client is deasserted, otherwise
the link will never come up. The order was changed in cf236e0c0d59.
Restore the correct order to make the driver work again on boards where
the PHY provides the reference clock. This also changes the order for
boards where the Soc is the PHY reference clock divider, but this
shouldn't do any harm.

Link: https://lore.kernel.org/r/20221101095714.440001-1-s.hauer@pengutronix.de
Fixes: cf236e0c0d59 ("PCI: imx6: Do not hide PHY driver callbacks and refine the error handling")
Tested-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 2616585ca5f8aa0982775c06eeebd1062c918976..1dde5c579edc82a0d38925b45c078a48ba390619 100644 (file)
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -952,12 +952,6 @@ static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
                }
        }
 
-       ret = imx6_pcie_deassert_core_reset(imx6_pcie);
-       if (ret < 0) {
-               dev_err(dev, "pcie deassert core reset failed: %d\n", ret);
-               goto err_phy_off;
-       }
-
        if (imx6_pcie->phy) {
                ret = phy_power_on(imx6_pcie->phy);
                if (ret) {
@@ -965,6 +959,13 @@ static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
                        goto err_phy_off;
                }
        }
+
+       ret = imx6_pcie_deassert_core_reset(imx6_pcie);
+       if (ret < 0) {
+               dev_err(dev, "pcie deassert core reset failed: %d\n", ret);
+               goto err_phy_off;
+       }
+
        imx6_setup_phy_mpll(imx6_pcie);
 
        return 0;