[Gta04-owner] Replicant modem suspend behavior

[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).

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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