[alsa-devel] [PATCH 04/19] ASoC: davinci: Don't set unused struct snd_pcm_hardware fields

[Peter Ujfalusi]

On 12/20/2013 03:20 PM, Lars-Peter Clausen wrote:
> The ASoC core assumes that the PCM component of the ASoC card transparently
> moves data around and does not impose any restrictions on the memory layout or
> the transfer speed. It ignores all fields from the snd_pcm_hardware struct for
> the PCM driver that are related to this. Setting these fields in the PCM driver
> might suggest otherwise though, so rather not set them.

Acked-by: Peter Ujfalusi <peter.ujfalusi at ti.com>

> Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
> Cc: Peter Ujfalusi <peter.ujfalusi at ti.com>
> Cc: Olof Johansson <olof at lixom.net>
> ---
>  sound/soc/davinci/davinci-pcm.c | 28 ----------------------------
>  1 file changed, 28 deletions(-)
> 
> diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
> index fb5d107..14145cd 100644
> --- a/sound/soc/davinci/davinci-pcm.c
> +++ b/sound/soc/davinci/davinci-pcm.c
> @@ -46,33 +46,11 @@ static void print_buf_info(int slot, char *name)
>  }
>  #endif
>  
> -#define DAVINCI_PCM_FMTBITS	(\
> -				SNDRV_PCM_FMTBIT_S8	|\
> -				SNDRV_PCM_FMTBIT_U8	|\
> -				SNDRV_PCM_FMTBIT_S16_LE	|\
> -				SNDRV_PCM_FMTBIT_S16_BE	|\
> -				SNDRV_PCM_FMTBIT_U16_LE	|\
> -				SNDRV_PCM_FMTBIT_U16_BE	|\
> -				SNDRV_PCM_FMTBIT_S24_LE	|\
> -				SNDRV_PCM_FMTBIT_S24_BE	|\
> -				SNDRV_PCM_FMTBIT_U24_LE	|\
> -				SNDRV_PCM_FMTBIT_U24_BE	|\
> -				SNDRV_PCM_FMTBIT_S32_LE	|\
> -				SNDRV_PCM_FMTBIT_S32_BE	|\
> -				SNDRV_PCM_FMTBIT_U32_LE	|\
> -				SNDRV_PCM_FMTBIT_U32_BE)
> -
>  static struct snd_pcm_hardware pcm_hardware_playback = {
>  	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
>  		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
>  		 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME|
>  		 SNDRV_PCM_INFO_BATCH),
> -	.formats = DAVINCI_PCM_FMTBITS,
> -	.rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
> -	.rate_min = 8000,
> -	.rate_max = 192000,
> -	.channels_min = 2,
> -	.channels_max = 384,
>  	.buffer_bytes_max = 128 * 1024,
>  	.period_bytes_min = 32,
>  	.period_bytes_max = 8 * 1024,
> @@ -86,12 +64,6 @@ static struct snd_pcm_hardware pcm_hardware_capture = {
>  		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
>  		 SNDRV_PCM_INFO_PAUSE |
>  		 SNDRV_PCM_INFO_BATCH),
> -	.formats = DAVINCI_PCM_FMTBITS,
> -	.rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
> -	.rate_min = 8000,
> -	.rate_max = 192000,
> -	.channels_min = 2,
> -	.channels_max = 384,
>  	.buffer_bytes_max = 128 * 1024,
>  	.period_bytes_min = 32,
>  	.period_bytes_max = 8 * 1024,
>