[Letux-kernel] Modem disappears GTA04A4

[Andreas Kemnade]

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.

Regards,
Andreas
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