On 04/29/2012 11:35 PM, Russell King - ARM Linux wrote:
> Please can someone at TI take a current mainline kernel, build it, and
> test out audio support on the 4430SDP - specifically output through the
> headset jack into a line input, and report when it works.  Thanks.

Try to use my attached aconf for SDP4430 to configure the HS playback.
Note that the HS is not a line out, so on your line-in device it will
cause distortion. If you have a headset/headphone you will have better
quality.
alsactl -f blaze.aconf restore

To play samples with aplay:
aplay -Dplughw:0,0 <wav file>
The sample format fot Legacy McPDM is S32_LE, 96KHz, 24bit (32 bit
sample with 24 LSB).

The slow pace audio playback is because at this point we do not have the
full audio stack up. The AESS IP does not have driver. You need to
disable CONFIG_OMAP_RESET_CLOCKS. This will fic the audio playback speed.

As for the basic usage:
We support up to 5 channel playback on OMAP4 in Legacy mode:
channel 1/2 (stereo): Headset, earpiece
channel 3/4: Handsfree/Line out
channel 5: Vibra

So with stereo sample you can only play to the Headset/Earpiece.
You need to have 5 channel audio, and valid data on channel 5 to be able
to drive the vibra.

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Péter