[alsa-devel] [PATCH v2 1/3] ASoC: zx: Add ZTE zx296702 pcm support

[Mark Brown]

On Wed, May 06, 2015 at 08:38:03PM +0800, Jun Nie wrote:

> +static const struct snd_pcm_hardware snd_zx_hardware = {
> +	.info			= SNDRV_PCM_INFO_MMAP |
> +				  SNDRV_PCM_INFO_MMAP_VALID |
> +				  SNDRV_PCM_INFO_INTERLEAVED |
> +				  SNDRV_PCM_INFO_PAUSE |
> +				  SNDRV_PCM_INFO_RESUME |
> +				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
> +	.period_bytes_min	= 32,
> +	.period_bytes_max	= 16 * 1024,
> +	.periods_min		= 2,
> +	.periods_max		= 32,
> +	.buffer_bytes_max       = 64 * 1024,
> +};

As I said last time I'm not sure why you are manually defining these -
the capabilities of the DMA controller should be being enumerated from
the DMA controller driver.  See dmaengine_pcm_set_runtime_hwparams().
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