[PATCH 6.0 0589/1073] PCI: imx6: Initialize PHY before deasserting core reset

Greg Kroah-Hartman
2022-12-28T16:09:53Z

From: Sascha Hauer <s.hauer@pengutronix.de>

[ Upstream commit ae6b9a65af480144da323436d90e149501ea8937 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 6e5debdbc55b..6ffe95d68ae7 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -942,12 +942,6 @@ 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_init(imx6_pcie->phy);
if (ret) {
@@ -955,6 +949,13 @@ 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;
--
2.35.1