[PATCH V3 09/21] PCI: tegra194: Calibrate P2U for endpoint mode

Vidya Sagar
2022-10-13T18:43:32Z

Calibrate P2U for endpoint controller to request UPHY PLL rate change to
Gen1 during initialization. This helps to reset stale PLL state from the
previous bad link state.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
V3:
* Reworded the commit message

V2:
* None

drivers/pci/controller/dwc/pcie-tegra194.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index dff38f73d9a7..910dc6c2154e 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1130,6 +1130,9 @@ static int tegra_pcie_enable_phy(struct tegra_pcie_dw *pcie)
ret = phy_power_on(pcie->phys[i]);
if (ret < 0)
goto phy_exit;
+
+ if (pcie->of_data->mode == DW_PCIE_EP_TYPE)
+ phy_calibrate(pcie->phys[i]);
}

return 0;
--
2.17.1