[alsa-devel] twl4030 latency update

Peter Ujfalusi peter.ujfalusi at ti.com
Wed Mar 26 09:41:07 CET 2014

On 03/26/2014 10:26 AM, Peter Ujfalusi wrote:
> Hi Leonardo,
> On 03/25/2014 08:50 PM, Leonardo Gabrielli wrote:
>> Thanks Peter,
>> I've been able today to test following your suggestions.
>> Unfortunately I didn't get any improvement on latency, but reducing sDMA FIFO
>> threshold improved on audio integrity (with some period+samplerate
>> combinations I have corrupted audio, maybe scrambled or empty frames).
> Can you elaborate on the corrupted/scrambled audio? I just don't see how it
> can happen. Can you get the /proc/asound/card0/pcm0p/sub0/hw_params when you
> have the audio quality issue?
> I can not run jackd on the board anymore (with linux-next at least):
> FATAL: cannot locate cpu MHz in /proc/cpuinfo
> but with aplay -v --period-size=512 or 64 2ch-left-since-22050.wav
> seams to be fine for me (assuming AU=ko means that it is the corrupted one)

Yeah, this is not correct. it means 512 or 64 periods and not the period sizes.
I would need the hw_params for the actual playback to be able to reproduce the


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