[V5,2/9] PCI: tegra194: Calibrate P2U for endpoint mode
From: Manikanta Maddireddy <hidden>
Date: 2026-02-08 18:10:34
Also in:
linux-pci, linux-tegra, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
From: Vidya Sagar <redacted> 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 <redacted> Signed-off-by: Manikanta Maddireddy <redacted> --- V5: * None V4: * None V3: * None 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 f026af7c2ce0..51bad99cec31 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c@@ -1058,6 +1058,9 @@ 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;
--
2.34.1