ALSA with linux-omap

ALSA with linux-omap

[Philip Balister]

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I'm trying to run some code that uses ALSA to playback audio with the 
"new pm branch". Unfortunately, I do not think ALSA is working.

It feels like alsa stops accepting data and then blocks, so our 
application stops. (Based on some observations of processor usage)

cat /dev/random > /dev/dsp make a brief soft sound, then stops. Ctrl-c 
and you can hear a pop a few seconds later.

Does this make any sense to anyone? The non pm kernels have been working 
great.

Philip

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Re: ALSA with linux-omap

[Jarkko Nikula]

On Thu, 15 Jan 2009 18:24:25 -0700
"ext Philip Balister" <philip@balister.org> wrote:

> cat /dev/random > /dev/dsp make a brief soft sound, then stops. Ctrl-c 
> and you can hear a pop a few seconds later.
> 
This sounds like digital audio link between cpu and codec is working but
DMA stalls after transmitting one ALSA period or buffer.

What's your HW? And probably you are using ASoC on OMAP. I.e.
CONFIG_SND_SOC & CONFIG_SND_OMAP_SOC?

> Does this make any sense to anyone? The non pm kernels have been working 
> great.
> 
I'm also curious to know since unfortunately I haven't investigated
yet how well ASoC OMAP drivers co-operate with the dynamic PM.


Jarkko