[Gta04-owner] hw routing audio patch removed in 3.7?

Dr. H. Nikolaus Schaller hns at goldelico.com
Sat Jun 8 14:30:43 CEST 2013


Am 08.06.2013 um 14:13 schrieb Andreas Kemnade:

> Hi,
> i am looking through the commit logs and see that Benjamin Deering has
> sent my hardware routing patch again (that is for example here:
> https://github.com/radekp/linux-2.6/commit/f43ce5c444de7db988ad214257f4a6ac0e49308d )
> in January and it was applied to 3.7. Then it was removed due to white
> noise.

Yes, I tried and removed it again.

>  Under which circumstances there was white noise?

It simply played white noise on the handsfree speaker after using the
speaker through aplayer for the first time and I did not find any alsa
control that influenced it.

If I remember correctly, it did not disappear until reboot.

Removing the patch completely made it work again.

> So maybe i can
> fix things.

That would be great!

One thing we should fix in this step as well is that there is a dai function
to set the McBSP to tristate [1].

I.e. we should not work directly with Pinmux in this patch. This
may even be the reason for the white noise (there are differences
in the pinmux system in different kernel versions).


[1] http://lxr.free-electrons.com/ident?v=3.7;a=arm;i=snd_soc_dai_set_tristate

More information about the Gta04-owner mailing list