[alsa-devel] [PATCH 0/5] ASoC: davinci: Use edma-pcm and remove davinci-pcm

[Peter Ujfalusi]

On 03/05/2015 12:45 PM, Peter Ujfalusi wrote:
> OK, this is also supported by the edma-pcm, you need to enable the FIFO and
> specify the threshold.

Via edma-pcm you can disable the period interrupts so for example PA can work
in this mode. You have big enough buffer and you do not get any interrupts
during audio, just user space timer to check the audio status every now and then.
This was not possible with the davinci-pcm.

>> I use a 4MB buffer for that 16-channels-of-32-bits system, usually with 8
>> periods of 512kB each.
> 
> Glad to hear, if you ever need to update the kernel, the edma-pcm conversion
> will not going to cause you regression ;)
> 
>> Met vriendelijke groet / kind regards,
>>
>> Mike Looijmans
>> System Expert
>>
>>
>> TOPIC Embedded Systems
>> Eindhovenseweg 32-C, NL-5683 KH Best
>> Postbus 440, NL-5680 AK Best
>> Telefoon: (+31) (0) 499 33 69 79
>> Telefax:  (+31) (0) 499 33 69 70
>> E-mail: mike.looijmans at topic.nl
>> Website: www.topic.nl
>>
>> Please consider the environment before printing this e-mail
>>
>> Topic zoekt gedreven (embedded) software specialisten!
>> http://topic.nl/vacatures/topic-zoekt-software-engineers/
>>
> 
> 


-- 
Péter