ASoC:Question on strict sequence followed for trigger

ASoC:Question on strict sequence followed for trigger

[gsantosh]

Hi All,

I see there is a strict sequence followed for trigger callback to codec
dai, platform dai and cpu dai.
In the below function of soc-core .
int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd);

In some scenarios we may require the sequence to be the other case to make
sure the underlying DSP / codec is configured and triggered properly. I
have a requirement that this sequence has to be
1)        Codec_dai
2)        Cpu_dai
3)        Platform dai

Will this call sequence can be changed or there is no room to change this
sequence.

Regards,
Santosh M G.

Re: ASoC:Question on strict sequence followed for trigger

[Clemens Ladisch]

gsantosh@codeaurora.org wrote:
> I see there is a strict sequence followed for trigger callback to codec
> dai, platform dai and cpu dai.
> In the below function of soc-core .
> int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
>
> In some scenarios we may require the sequence to be the other case to make
> sure the underlying DSP / codec is configured and triggered properly.

The trigger callback should do nothing but actually start the stream.
(In the ideal case, this would be setting one bit in a register of the
DMA controller.)

Any configuration should be done in hw_params.


Regards,
Clemens

Re: ASoC:Question on strict sequence followed for trigger

[Mark Brown]

On Wed, Mar 28, 2012 at 05:25:14PM -0700, gsantosh@codeaurora.org wrote:
> Hi All,

*ALWAYS* CC maintainers.  Mails sent to the mailing list are likely to
be ignored.

> In some scenarios we may require the sequence to be the other case to make
> sure the underlying DSP / codec is configured and triggered properly. I
> have a requirement that this sequence has to be
> 1)        Codec_dai
> 2)        Cpu_dai
> 3)        Platform dai

> Will this call sequence can be changed or there is no room to change this
> sequence.

You'll need to be more concrete about what you're actually trying to
achieve.