[alsa-devel] ALSA: oxygen: set fifo_size

[Takashi Iwai]

At Sun, 21 Sep 2014 22:52:46 +0200,
Clemens Ladisch wrote:
> 
> Allow the driver to report the hardware FIFO size.
> 
> Signed-off-by: Clemens Ladisch <clemens at ladisch.de>

Applied, thanks.


Takashi

> ---
>  sound/pci/oxygen/oxygen_pcm.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/sound/pci/oxygen/oxygen_pcm.c b/sound/pci/oxygen/oxygen_pcm.c
> index cc0bcd9..0282824 100644
> --- a/sound/pci/oxygen/oxygen_pcm.c
> +++ b/sound/pci/oxygen/oxygen_pcm.c
> @@ -29,6 +29,9 @@
>  /* the multichannel DMA channel has a 24-bit counter */
>  #define BUFFER_BYTES_MAX_MULTICH	((1 << 24) * 4)
> 
> +#define FIFO_BYTES			256
> +#define FIFO_BYTES_MULTICH		1024
> +
>  #define PERIOD_BYTES_MIN		64
> 
>  #define DEFAULT_BUFFER_BYTES		(BUFFER_BYTES_MAX / 2)
> @@ -60,6 +63,7 @@ static const struct snd_pcm_hardware oxygen_stereo_hardware = {
>  	.period_bytes_max = BUFFER_BYTES_MAX,
>  	.periods_min = 1,
>  	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
> +	.fifo_size = FIFO_BYTES,
>  };
>  static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
>  	.info = SNDRV_PCM_INFO_MMAP |
> @@ -87,6 +91,7 @@ static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
>  	.period_bytes_max = BUFFER_BYTES_MAX_MULTICH,
>  	.periods_min = 1,
>  	.periods_max = BUFFER_BYTES_MAX_MULTICH / PERIOD_BYTES_MIN,
> +	.fifo_size = FIFO_BYTES_MULTICH,
>  };
>  static const struct snd_pcm_hardware oxygen_ac97_hardware = {
>  	.info = SNDRV_PCM_INFO_MMAP |
> @@ -106,6 +111,7 @@ static const struct snd_pcm_hardware oxygen_ac97_hardware = {
>  	.period_bytes_max = BUFFER_BYTES_MAX,
>  	.periods_min = 1,
>  	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
> +	.fifo_size = FIFO_BYTES,
>  };
> 
>  static const struct snd_pcm_hardware *const oxygen_hardware[PCM_COUNT] = {
> @@ -141,6 +147,10 @@ static int oxygen_open(struct snd_pcm_substream *substream,
>  		runtime->hw.rates &= ~(SNDRV_PCM_RATE_32000 |
>  				       SNDRV_PCM_RATE_64000);
>  		runtime->hw.rate_min = 44100;
> +		/* fall through */
> +	case PCM_A:
> +	case PCM_B:
> +		runtime->hw.fifo_size = 0;
>  		break;
>  	case PCM_MULTICH:
>  		runtime->hw.channels_max = chip->model.dac_channels_pcm;
>