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

[Loic Poulain]

On Sat, 22 May 2021 at 21:14, Aleksander Morgado
<aleksander at aleksander.es> wrote:
>
> Hey Loic and Carl,
>
> 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.

Regards,
Loic