[Letux-kernel] Modem disappears GTA04A4

Andreas Kemnade andreas at kemnade.info
Sat Jan 26 15:22:59 CET 2019


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.

Regards,
Andreas
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