[PATCH v2] PCI: imx6: Initialize PHY before deasserting core reset

[Sascha Hauer]

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.

Fixes: cf236e0c0d59 ("PCI: imx6: Do not hide PHY driver callbacks and refine the error handling")
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Tested-by: Richard Zhu <hongxing.zhu at nxp.com>
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---

Notes:
    Changes since v1:
    - Change subject
    - s/phy/PHY/
    - Add explanation that the order is also changed for boards where the
      SoC is the PHY reference clock provider

 drivers/pci/controller/dwc/pci-imx6.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 2616585ca5f8a..1dde5c579edc8 100644
--- 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;
-- 
2.30.2