[alsa-devel] [PATCH v3] ASOC: tegra: move AC97 clock handling to the machine driver

Stefan Agner stefan at agner.ch
Wed Mar 19 00:12:44 CET 2014

Am 2014-03-18 21:30, schrieb Lucas Stach:
> On Tegra the convention is to have a single machine driver
> that's controlling the whole audio subsystem. This was
> introduced after the AC97 driver was merged and ever since
> AC97 has been broken.
> Move the clock handling to the machine driver, to be in line
> with the other Tegra drivers and give the machine driver
> full control over the single Tegra audio PLL.

On a Colibri T20, the AC97 Codec WM9712 gets detected and I can play
audio after unmuting the right output:
amixer -c 0 set 'Left HP Mixer PCM' on
amixer -c 0 set 'Right HP Mixer PCM' on

Tested-by: <stefan at agner.ch>

Lucas, did you tried once to capture input? In my test using arecord -f
cd, recorded sound is very slow (rate problem?)

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