PCI: tegra194: Calibrate pipe to UPHY for Endpoint mode

PCI: tegra194: Calibrate pipe to UPHY for Endpoint mode

Calibrate 'Pipe to Universal PHY(UPHY)' (P2U) for the Endpoint controller
to request UPHY PLL rate change to 2.5GT/s (Gen 1) during initialization.
This helps to reset stale PLL state from the previous bad link state.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Link: https://patch.msgid.link/20260324191000.1095768-3-mmaddireddy@nvidia.com