[Gta04-owner] Replicant modem suspend behavior

[Lukas Maerdian]

Am 12.12.2014 um 21:58 schrieb Adrien Dorsaz:
> Hello,
> 
> I remember that in QtMoko we had a specific patch for the GTA04 to check
> if the gsm chipset were still responding and restart it if not [0]. IIRC
> it happened often after receiving SMS in suspend mode (but not always,
> that's why it was difficult to point it out).
> 
> If I read correctly your workaround, it seems QtMoko had same issue and
> I think your solution is well better to workaround this issue (I'm not
> sure if it is the same, but I think so).

Hi Adrien,

the reenumeration is a different problem. In my case the modem does not
reenumerate. But still, thanks for pointing this out!

BR,
  Lukas

> Regards,
> Adrien
> 
> 
> [0]: https://github.com/radekp/qtmoko/blob/master/devices/gta04/patches/restart-when-modem-stops-working.patch
> [1]: https://github.com/radekp/qtmoko/blob/master/devices/gta04/src/devtools/scripts/fix-modem-reenumerate.sh
> <- the called script which restart completly the QtMoko main processus
> 
> Le ven 12 déc 2014 à 18:11, Lukas Maerdian <luk at slyon.de> a écrit :
>> Am 12.12.2014 um 16:41 schrieb Rico Rommel:
>>
>>     Am Freitag, 12. Dezember 2014, 16:17:54 schrieb Lukas Maerdian:
>>
>>         Hello everybody, since quite some time I'm trying to debug the
>>         Replicant modem suspend behavior, but I cannot find any
>>         solution... My problem is that the modem transitions into a
>>         strange state after a suspend/resume cycle, where it just
>>         returns the CME error 0 (phone failure) to every single AT
>>         command I send. If I kill/restart the Radio Interface Layer
>>         ("killall rild"), the modem seems to be working fine again, so
>>         I guess a "AT+CFUN=0; AT+CFUN=1" correctly resets the modem. 
>>
>>     I don't know if it's related to this or a bug in my phonesoftware,
>>     but on resume my phone switches automatically to airplane mode. So
>>     I have to set operating mode everytime the phone resumes. I use
>>     kernel 3.12 and can't remember, if this problem also existed with
>>     kernel 3.7. 
>>
>> Hi Rico, indeed this seems to be the case! I'm on 3.12 as well and
>> directly after resume everything is fine (CFUN: 1) but about 1 sec
>> after the resume I receive a "+CREG: 0" URC and if I issue "AT+CFUN?"
>> afterwards I receive a "+CFUN: 4", i.e. airplane mode. So, after this
>> I can simply switch airplane mode off (AT+CFUN=1) and the device will
>> be back online! Well... the 3G connection still needs to be
>> re-configured, but this is another issue. Thanks a bunch, this was the
>> missing piece I was looking for! I assume the modem is still
>> operational during suspend, i.e. is able to receive calls/SMS and
>> interrupt the CPU, can you confirm this? Best, Lukas
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> 
> 
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