[alsa-devel] *SPAM* Re: Please help in adding ams-delta support to ASoC

Peter Ujfalusi peter.ujfalusi at nokia.com
Wed Jun 3 07:28:06 CEST 2009

Hello Janusz,

On Tuesday 02 June 2009 13:50:50 ext Janusz Krzysztofik wrote:
> Hi Jarkko,
> Jarkko Nikula wrote:
> > Is the older implementation working at commit
> > d8376cc482b241701f7606c81ad578b90853e175 in linux-omap, i.e. last
> > commit before their removal?
> I have managed to check with that revision this morning and yes, the
> driver is working.
> I'll try you other suggestions as soon as I get back home.

Looking at the code at commit: d8376cc482b241701f7606c81ad578b90853e175 on l-o 
the comment about the need for the call the omap_stop_dma puzzled me.
Can you try something like this:

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index 6454e15..2df1792 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -67,6 +67,7 @@ static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
                spin_lock_irqsave(&prtd->lock, flags);
                if (prtd->period_index >= 0) {
                        if (++prtd->period_index == runtime->periods) {
+                               omap_stop_dma(prtd->dma_ch);
                                prtd->period_index = 0;
@@ -191,6 +192,7 @@ static int omap_pcm_trigger(struct snd_pcm_substream 
*substream, int cmd)
+               omap_stop_dma(prtd->dma_ch);
                prtd->period_index = 0;

This is on top of sound-2.6:topic/asoc, but l-o should not be that different.
Call the omap_stop_dma before actually starting the dma, and call stop also 
before restarting it.

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