[Gta04-owner] QtMoko mic volume

Neil Jerram neil at ossau.homelinux.net
Sat Aug 25 00:30:50 CEST 2012

NeilBrown <neilb at suse.de> writes:

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

>> 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?

Your one.

Then I realised I should just fetch Radek's repository too and look for
any differences between his v3.2-gta04-qtmoko-v47 and your 3.2-gta04.
As well as your recent sensor work, the big difference was the use of an
initramfs; I guess there are probably aspects of the boot process or
QtMoko rootfs that rely on that.

Anyway, finally I have good news.  After building Radek's
v3.2-gta04-qtmoko-v47 kernel - except without Andreas's patch ([1]
above) - and also after reverting the corresponding alsa state change in
the QtMoko rootfs [2], audio works again in both directions of a phone
call.  So I think [1] was what broke audio for GTA04A3; reverting [2] is
needed because [1] adds more mixer controls and so changes what is
needed in the state files.


I haven't yet looked at how to formalise this, i.e. to organise the
kernel code so that it works in future for both A3 and A4.  Can anyone
help with that?


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