[Gta04-owner] QtMoko mic volume

NeilBrown neilb at suse.de
Fri Aug 24 22:33:45 CEST 2012

On Fri, 24 Aug 2012 19:43:43 +0100 Neil Jerram <neil at ossau.homelinux.net>

> Radek Polak <psonek2 at seznam.cz> writes:
> > On Thursday, August 23, 2012 12:50:07 AM Neil Jerram wrote:
> >
> >> - the overrun and underrun logs look as though they might be the
> >>   culprit.
> >
> > IIRC these are quite normal. The voice routing is started before the call is 
> > connected and at this time there are no data from UMTS mic.
> Thanks, that's good to know,
> > You can also experiment with aplay/arecord to check if all the parts 
> > (earipiece, mic, umts mic/playback) work ok. The commands are here[1].
> >
> > Too bad i gave away my A3 ;-( Cant help you much more without it.
> >
> > Regards
> >
> > Radek
> >
> >
> > [1] http://projects.goldelico.com/p/gta04-kernel/page/Wireless/
> I tried a couple more things in gsm-voice-routing.c.
> First, I took out the echo cancellation, in case it was the problem.
> That made no difference.
> Then, I added debugging to check that the mic capture buffer had sound
> in it - and it does.
> Next, after a lot of thinking and googling, I noticed Andreas Kemnade's
> kernel patch for A4 HW routing [1], and wondered if it could cause a
> problem for the A3 SW routing (in particular "disables mcbsp4_dx") ...
> [1]
> https://github.com/radekp/linux-2.6/commit/f43ce5c444de7db988ad214257f4a6ac0e49308d
> NeilB's 3.2-gta04 branch doesn't have that patch, so I pulled and
> rebuilt that, thinking that it would be a simple replacement for the
> QtMoko kernel.
> However, after installing that kernel and its modules, now my boot
> doesn't complete...
> There are 2 identical uImage files in QtMoko: one on the VFAT partition,
> and one at /boot in the rootfs.  My first guess was to replace both of
> those with the new uImage.  After that the phone started booting but
> skipped the SD/NAND selection screen, and went to a screen with small
> Tux in the top left corner.  After that nothing more happened, and
> plugging in the USB cable wasn't recognised by my laptop.
> Then I thought maybe I should only replace the uImage in the QtMoko
> rootfs, so I put the VFAT uImage back as it was before.  Now, when the
> phone boots, I get the SD/NAND selection screen, and choose SD as
> usual.  After that I get the screen with small Tux, and nothing else -
> same as above.
> Any idea what I'm doing wrong?

What .config file did you use to build the kernel?  My gta04_defconfig, or
the one from the qtmoko kernel?
I the qtmoko might need some config options that I haven't enabled, such as

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