Issue with 2019.1 - kernel 4.19 - dwc3 fe200000.dwc3: Failed to get clk 'ref': -2

[frosteyes]

After upgrading a project from 2018.3 to 2019.1, I noticed the error when booting.

[    3.056808] dwc3 fe200000.dwc3: Failed to get clk 'ref': -2

So looking into it, it comes from the dwc3 core.c file, with the following commit.

https://github.com/Xilinx/linux-xlnx/commit/fe8abf332b8f66868013cfcd6bfe727136a2ab5f

After a search it could see it is also in the reference from Xilinx

https://www.xilinx.com/support/answers/72602.html

It is very annoying to have errors under a normal boot so hope it soon will be fixed in the linux-xlnx on github, and minimum fixed for 2019.2

[tsillanp]

USB is not working on a custom board, is this a sign of a clocking problem or not?

[frosteyes]

The issue mentioned here is more of annoyance, than an issue, as it does not influence if USB are working or not.

Notice USB is pretty complex, so depending on your custom board you might check that the ulpi communication is working, as the dwc3 in reality is using the vbus detect from ulpi to start usb communication if you are a device.