EM120 not correctly booting up, unknown wwan control port exposed?

[Aleksander Morgado]

Hey,

> >
> > I wanted to test the EM120 setup I have with latest MM git master and
> > kernel 5.13.0-rc2, but unfortunately there is some issue, not sure if
> > in device or in kernel driver. These are the kernel logs I get as
> > output when the issue happens:
> >
> > [  263.458712] mhi-pci-generic 0000:01:00.0: can't change power state
> > from D3cold to D0 (config space inaccessible)
> > [  263.458727] mhi-pci-generic 0000:01:00.0: can't change power state
> > from D3cold to D0 (config space inaccessible)
> > [  263.458736] mhi-pci-generic 0000:01:00.0: failed to resume device: -22
>
> The problem seems to be with the runtime power management. MHI pci
> driver is moving the device in low power state (suspend) when not used
> for ~2s. And here device resume fails. How the EM120 is connected to
> your machine is it via M2 laptop port or are you using a 'dev-board'
> with PCI-express slot? can you share the firmware version? building
> mainline right now and going to test that on my side.
>

This is with a EM120 devkit in a PCI-express slot in my desktop PC,
running firmware EM120RGLAPR02A07.
I tested this setup some months ago with the "mhi_uci_q" driver from
Quectel, and I didn't see any problem like this.


--
Aleksander
https://aleksander.es