mbim-proxy listening to systemd suspend/resume events
gciofono at gmail.com
Sat Sep 19 02:09:08 UTC 2020
It's really a per-modem toggle but unfortunately there's nothing in the
> kernel I can think of that tells us whether the modem (a) keeps power
> over suspend and (b) the hardware/firmware/driver can handle re-
> handshake of the data pipe (eg USB, PCI, serial, etc) across
> eg, many modem dev boards (eg external PCIe/M.2 to USB dev kits) are
> externally powered but there's no way to know that automatically.
> Options I see are per-connection toggle (which I don't really like
> since it's really per-modem) or maybe udev/etc tagging of the modem
> object by the system integrator?
If I may, the picture is even more complex: there are often hubs between
the host and the modem.
These hubs, likewise, can be powered or not, and hold the VBUS high or not.
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