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Check if SSC is on or off

Mar 04, 2024

I followed the threads [1][2] on disabling the Spread Spectrum Clocking (SSC) for PCIe by patching the .dtb files as close as possible and I now re-flashed one of our Orin Developer Kits using the SDK manager.

I did this on request of a colleague, so I’m not into all the details where this was an issue.

However, is there a simple way to check whether SSC is enabled or disabled for a given clock (e.g. TEGRA234_CLK_PLLE, TEGRA234_CLK_PLLNVHS, TEGRA234_CLK_PLLGBE) during runtime, preferrably via a console command?


Thanks!


[1] How to disable Spread Spectrum Clocking(SSC) on Orin - Jetson & Embedded Systems / Jetson AGX Orin - NVIDIA Developer Forums

[2] Trying to disable PCIe spread spectrum clocking in Orin – cannot find definitions for TEGRA234_CLK_PLLNVHS, etc - Jetson & Embedded Systems / Jetson AGX Orin - NVIDIA Developer Forums