The PCIe Ref_clk output on Xavier is gated.
It turns on the ref_clk for a short time and then if no external PCIE devices are there it turn the clock off.
Is there some way to disable the gating in the BSP perhaps in tegra-pcie.c, so that it is ALWAYS outputting the PCIe ref_clk even if there is no devices detected?
What is the purpose to do that if no device is connected?
If it is for some experiment purpose, please add “nvidia,disable-power-down;” to the respective PCIe controller’s device-tree node. This keeps the PCIe controller in un-power-gated state and keeps the REFCLK flowing to the slot.
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