[alsa-devel] [RFC PATCH] ASoC: omap-mcbsp: Add support for highter rate up to 384000

[Peter Ujfalusi]

On 08/07/2013 09:28 PM, Michael Trimarchi wrote:
> Add support for highter rate up to 384000Khz. There are codecs in the
> market that can play up to this frequency.
> Test was done just with:
> 
> #define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_8000_192000)
> 
> playing wav file 32bit/192000Khz stereo. Some glitch has observed
> but this should depend on the selected min buffer bytes that was
> left untouched in aplay and in the omap-pcm driver.
> 
> Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> ---
>  sound/soc/omap/omap-mcbsp.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
> index 7483efb..1e95f6a 100644
> --- a/sound/soc/omap/omap-mcbsp.c
> +++ b/sound/soc/omap/omap-mcbsp.c
> @@ -39,7 +39,9 @@
>  #include "mcbsp.h"
>  #include "omap-mcbsp.h"
>  
> -#define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_8000_96000)
> +#define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_8000_192000 |		\

I think only this change is enough for what you want to achieve.

> +				 SNDRV_PCM_RATE_CONTINUOUS |		\
> +				 SNDRV_PCM_RATE_KNOT)

The _KNOT is for sure not needed and I would not set the CONTINUOUS either.

>  
>  #define OMAP_MCBSP_SOC_SINGLE_S16_EXT(xname, xmin, xmax, \
>  	xhandler_get, xhandler_put) \
> @@ -574,11 +576,15 @@ static struct snd_soc_dai_driver omap_mcbsp_dai = {
>  		.channels_max = 16,
>  		.rates = OMAP_MCBSP_RATES,
>  		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
> +		.rate_min = 8000,
> +		.rate_max = 384000,

Why you want to limit the rates here?

>  	},
>  	.capture = {
>  		.channels_min = 1,
>  		.channels_max = 16,
>  		.rates = OMAP_MCBSP_RATES,
> +		.rate_min = 8000,
> +		.rate_max = 384000,

Same here, do not set these.

>  		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
>  	},
>  	.ops = &mcbsp_dai_ops,
> 


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