Re: [RFC/PATCH] Stop Apple i2s DMA gracefully

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Hi Paul,

any progress about the patch since then?
Or did I overlook?


thanks,

Takashi

At Mon, 6 Nov 2006 21:41:21 +1100,
Paul Mackerras wrote:
> 
> Takashi Iwai writes:
> 
> > The trigger callback cannot sleep in design.  It's always atomic.
> > 
> > Usually, the driver calls snd_pcm_suspend_all() in suspend callback,
> > which triggers with SNDRV_PCM_TRIGGER_SUSPEND.  In your case, this
> > should terminate the DMA while SNDRV_PCM_TRIGGER_STOP continues the
> > DMA.  Or, put a sync call after snd_pcm_suspend_all() in the suspend
> > callback.
> 
> OK, this sounds like the suspend trigger should just abort the DMA, on
> the basis that the hardware will get reset in the suspend/resume
> process and so there will be no bytes queued up to cause trouble
> later.  I'll whip up a patch.
> 
> Paul.
> 

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