Orin NX pci controller running at 8GT/s with a 16GT/s capable device

Autonomous Machines Jetson & Embedded Systems Jetson Orin NX
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1

According to Orin NX datasheet, all pcie ports are Gen4 capable. On a custom carrier board, I have a Gen4 (x1) ethernet module connected to pcie controller 1. However it is only running at link speed of 8GT/s.

Lspci hows the following for the controller:

0001:00:00.0 PCI bridge: NVIDIA Corporation Device 229e (rev a1) (prog-if 00 [Normal decode])
LnkCap: Port #0, Speed 8GT/s, Width x1, ASPM not supported
LnkSta: Speed 8GT/s (ok), Width x1 (ok)

The ethernet module:

0001:01:00.0 Ethernet controller: Aquantia Corp. Device 94c0 (rev 03)
LnkCap: Port #0, Speed 16GT/s, Width x2, ASPM not supported
LnkSta: Speed 8GT/s (downgraded), Width x1 (downgraded)

How would I “convince” the controller to allow Gen4 link speeds?
full lspci output (9.6 KB)

3

Which JetPack you’re using? Could you try with JetPack 5.1.2?

4

Hi,
Please use Jetpack 5.1.2 and try this setup:
Orin Unable to Reach 10 Gbps Networking - #3 by DaneLLL

See if you can achieve target throughput on the custom board.

5

It was Jetpack 5.1.1.

6

Okay, the nearest day I can get around to test this is on friday, so I’ll let you know then.

7

That solved the issue! Thanks.

0001:00:00.0 PCI bridge: NVIDIA Corporation Device 229e (rev a1) (prog-if 00 [Normal decode])
LnkCap: Port #0, Speed 16GT/s, Width x1, ASPM not supported
LnkSta: Speed 16GT/s (ok), Width x1 (ok)

0001:01:00.0 Ethernet controller: Aquantia Corp. Device 94c0 (rev 03)
LnkCap: Port #0, Speed 16GT/s, Width x2, ASPM not supported
LnkSta: Speed 16GT/s (ok), Width x1 (downgraded)

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