Correct alsastatefile fits all Neos
joerg at openmoko.org
Fri Feb 13 03:10:18 CET 2009
[[according to Steve's 5-words rule, and as Marek mentioned the mail below
wasn't clear enough]]
An alsa.state file that does not work on ALL Neo FR (gta02)
is an INCORRECT statefile.
There is NO NEED to have device-specific alsa.state files! 
All hardware changes done to handset microphone circuitry (even beginning at
GTA01) are *compatible* with a differential input setup of WM8753.
--- start of quoted mail ---
Any alsa.state file with control63 set to either "Mic2" or "Right PGA"
WILL WORK **FOR ALL NEO DEVICES** in a very similar way, only thing you need
to do (maybe) is adjust mic sensitivity. Even this probably isn't needed as
calypso should implement its own Automatic Level Control which easily should
equalize the rather small differences in mic sensitivity between first GTA01
across all devices until newest GTA02A8.
Setting different to "Mic2" or "Right PGA" for control63 however result in
alsa.state files working for part of the devices while failing completely for
others. However even the devices that may work with these screwed
control63-settings won't yield a result better than that of a correct
alsa.state control63 setting. Alas it seems there is a lot of those broken
gsmhandset.state version around.
ECHO CAN NOT BE FIXED FOR GOOD by adjusting any mixer controls (except
avoiding false feedback pathes of course, like opening a path from RXP/N to
MONO1/2 in the mixer section). Echo needs to be fixed by sending correct AT
commands to calypso to enable echo cancellation . Mickey has sent a patch
for FSO some weeks ago to do this prior to each call.
Please be aware that applying a patch to a alsa.state file might not yield the
desired result, if the patched file differs from that file used to generate
the patch. Trivial, but worth to mention it once again.
So please don't publish alsa.state patches! Publish the complete file instead,
it's not that big anyway.
Please also note I'm not able to adjust volume here in Germany to suit the
taste of anybody in Taipei. In the end we need to offer a method to our
customers they can easily adjust volume to their own preferences. Everything
else is useless effort.
: except for adjusting volume reasons, which should not be a necessity.
Applies to GTA02 only. For GTA01 file format differs for unknown reason.
GTA01 Mixer settings should be identical to GTA02. GTA03 will need completely
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 197 bytes
Desc: This is a digitally signed message part.
Url : http://lists.openmoko.org/pipermail/openmoko-kernel/attachments/20090213/b5c09f22/attachment.pgp
More information about the openmoko-kernel