Hi Aleksander:
Do you test PM suspend or Runtime Suspend?
MHI/PCIE PM suspend is not support by your PC, must use Lenovo laptop.
Regards,
Carl Yin
On Sun, 23 May 2021 at 21:58, Aleksander Morgado <[email protected]>
wrote:
>
> 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.
It works correctly on my side.
> >
>
> This is with a EM120 devkit in a PCI-express slot in my desktop PC,
> running firmware EM120RGLAPR02A07.
Ok mine is EM120RGLAPR02A07M4G (from --query-device-caps output).
Maybe the suspend issue is due to the devkit. But better to confirm with Carl.
> I tested this setup some months ago with the "mhi_uci_q" driver from
> Quectel, and I didn't see any problem like this.
Runtime PM was probably not enabled/implemented. For now, maybe apply
`ATTR{power/control}="on"` for this device, which should prevent dynamic
runtime PM.
Regards,
Loic
>
>
> --
> Aleksander
> https://aleksander.es
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