[alsa-devel] [PATCHv2 16/20] ASoC: OMAP: Use DMA operating mode of McBSP

[Jarkko Nikula]

On Tue, 11 Aug 2009 16:05:27 +0300
Eduardo Valentin <eduardo.valentin at nokia.com> wrote:

> From: Eduardo Valentin <eduardo.valentin at nokia.com>
> 
> Signed-off-by: Eduardo Valentin <eduardo.valentin at nokia.com>
> ---
>  sound/soc/omap/omap-mcbsp.c |    8 ++++++--
>  sound/soc/omap/omap-pcm.c   |   13 +++++++++++--
>  sound/soc/omap/omap-pcm.h   |    1 +
>  3 files changed, 18 insertions(+), 4 deletions(-)
> 
...
> diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
> index 0c1ba0f..d8f52e8 100644
> --- a/sound/soc/omap/omap-pcm.c
> +++ b/sound/soc/omap/omap-pcm.c
> @@ -144,7 +144,9 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
>  
>  	memset(&dma_params, 0, sizeof(dma_params));
>  
> -	if (cpu_is_omap34xx())
> +	/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
> +	if (cpu_is_omap34xx() &&
> +			(dma_data->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD))
>  		sync_mode = OMAP_DMA_SYNC_FRAME;
>  	else
>  		sync_mode = OMAP_DMA_SYNC_ELEMENT;

Note, you could avoid the compile error if you move this into
omap-mcbsp.c and pass only sync_mode here. Probably as easy as
dma_data->sync_mode since OMAP_DMA_SYNC_ELEMENT is zero.

The McBSP DAI must and can know the DMA parameters (like sync_mode) but
otherwise (like MCBSP_DMA_MODE_xxx) it sounds unnecessary glue between
the drivers.

> @@ -193,9 +195,16 @@ static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
>  	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
>  	unsigned long flags;
>  	int ret = 0;
> -	int samples = snd_pcm_lib_period_bytes(substream) >> 1;
> +	int samples;
>  
>  	spin_lock_irqsave(&prtd->lock, flags);
> +
> +	/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
> +	if (dma_data->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
> +		samples = snd_pcm_lib_period_bytes(substream) >> 1;
> +	else
> +		samples = 1;
> +

Can these lines in this patch and in patch 15 to be moved into
omap_mcbsp_trigger? For me it looks it would simplify and remove the
glue between the drivers.


-- 
Jarkko
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