[Letux-kernel] Modem disappears GTA04A4

[H. Nikolaus Schaller]

> Am 26.01.2019 um 16:09 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> 
>> Am 26.01.2019 um 15:22 schrieb Andreas Kemnade <andreas at kemnade.info>:
>> 
>> Hi,
>> 
>> On Sat, 26 Jan 2019 14:35:48 +0100
>> Jake <jake42 at rommelwood.de> wrote:
>> 
>>> On Fri, 2019-01-25 at 07:04 +0100, Andreas Kemnade wrote:
>>>> On Sun, 20 Jan 2019 21:29:39 +0100
>>>> Andreas Kemnade <andreas at kemnade.info> wrote:
>>>> 
>>>>> On Sun, 13 Jan 2019 23:28:35 +0100
>>>>> Jake <jake42 at rommelwood.de> wrote:
>>>>> 
>>>>>> Hi,
>>>>>> 
>>>>>> I'm experiencing a problem with the modem disappearing on GTA04.
>>>>>> For example when writing text messages to and fro with suspends
>>>>>> in
>>>>>> between it happens at times, that the modem /dev/ttyHS* files
>>>>>> disappear. The modem is still unblocked in rfkill. 
>>>>>> 
>>>>>> I don't have any logs yet. I usually powered off the GTA04A4,
>>>>>> removed
>>>>>> the battery for a few seconds, reinserted and booted again to
>>>>>> continue
>>>>>> the conversation as soon as possible.
>>>>>> 
>>>>>> How can I toggle the gpio 186? to reenable the modem manually?
>>>>>> 
>>>>>> My observations so far:
>>>>>> 4.19-rc7: modem disappears sporadically
>>>>>> 4.19.12: modem disappears sporadically
>>>>>> 4.20: does not wake on incoming call/text    
>>>>> 
>>>>> can reproduce this. The corresponding event device works, but
>>>>> wakeup 
>>>>> does not work. Ruled out: dtb changes. Will do further research.
>>>>> 
>>>> 
>>>> does
>>>> devmem2 0x48002A1A h 0x4104
>>>> 
>>>> help also for you? Just execute it after every boot. For me it helps
>>>> with 4.20,
>>>> but no idea why it is needed now.  
>>> it helps. tested on 4.20.2.
>> 
>> ok, then I will prepare a patch for upstreaming. It will also fix
>> wakeup by aux button. I guess, we do not need the wwan-wakeup-button,
>> just a wakeup somehow.
> 
> I think it can be useful if the wakeup source is reported to a GUI in that case.
> That is why we have a button which could automatically open some phone
> application.

And I forgot, it is used by the hardware test:

http://git.goldelico.com/?p=letux-kernel.git;a=blob;f=Letux/root/hw-test;h=4924eed6f27246ecd5a239983565eec38e02f7e9;hb=b4691f6c7f08eb17bcbe06f0c779e73e9d633ecc#l690

which assumes the wwan trigger is mapped to an input event.

BR,
Nikolaus