how to resume pcm streams in driver? (esp. powermac snapper)

how to resume pcm streams in driver? (esp. powermac snapper)

[John Steele Scott]

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Hi,

In the last week or so Benjamin Herrenschmidt has released a kernel patch which
enables the sleep functionality on the iBook G4 and AlBook laptops.

I have an iBook G4 with Powermac Snapper audio. Most of the suspend/resume
functionality is fine, but one issue I am having a problem with is that pcm
streams are not being resumed.

The streams _are_ being suspended, but how are the supposed to be resumed? What
is the opposite of snd_pcm_suspend_all()?

I know the actual sound hardware is being restored (mostly) correctly, because
the "beep" functionality of the pmac driver works.

Any thoughts?

cheers,

John

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Re: how to resume pcm streams in driver? (esp. powermac snapper)

[Takashi Iwai]

At Thu, 25 Nov 2004 17:48:12 +1030,
John Steele Scott wrote:
> 
> Hi,
> 
> In the last week or so Benjamin Herrenschmidt has released a kernel patch which
> enables the sleep functionality on the iBook G4 and AlBook laptops.
> 
> I have an iBook G4 with Powermac Snapper audio. Most of the suspend/resume
> functionality is fine, but one issue I am having a problem with is that pcm
> streams are not being resumed.
> 
> The streams _are_ being suspended, but how are the supposed to be resumed? What
> is the opposite of snd_pcm_suspend_all()?

Nothing.  The application is required to call resume by itself
(i.e. preparing the PCM status, start the stream again).
In the case of OSS emulation, the oss emul module does it.


Takashi


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