Re: [MM] [PATCH] sim: retry SIM operations during initialization

[Ben Chan <benchan chromium org>]

> Do you mean that you still need the timeout even if the PIN request is
> not enabled?
>
> If the code tries to load Sim properties before unlocking the PIN and
> those fail, they will anyway get retried after the successful PIN unlock.

Yes, the issue happens on a SIM without PIN locked. One scenario is
when the modem is powered off during suspend. After the system
resumes, the modem boots up and ModemManager sees a new device.
ModemManager gets a CPIN response from the modem indicating that no
PIN unlock is required. If ModemManager immediately issues AT+CRSM to
access ICCID or IMSI, the command either fails with a +CRSM,110,0
response or sometimes a bogus value (which could be a problem with the
modem firmware, but we somehow need to work around that in software).
It becomes more reliable if there is a delay between getting CPIN
ready and initializing MMSim.  Similar problem could happen on a
system that finishes booting (and launching ModemManager) before the
SIM interface is fully ready.