[alsa-devel] [PATCH 1/2] sound: asoc: Adding support for SPEAr13XX ASoC driver

[Mark Brown]

On Fri, Mar 18, 2011 at 12:49:04PM +0530, rajeev wrote:
> On 3/17/2011 8:35 PM, Mark Brown wrote:
> > On Thu, Mar 17, 2011 at 04:53:35PM +0530, Rajeev Kumar wrote:

> >> +static int spear13xx_i2s_hw_params(struct snd_pcm_substream *substream,
> >> +		struct snd_pcm_hw_params *params,
> >> +		struct snd_soc_dai *dai)
> >> +{
> >> +	struct spear13xx_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
> >> +	u32 channel;

> >> +	channel = params_channels(params);

> >> +	dev->mode = channel;

> > Having channel here isn't doing a lot...

> I was actually planning to expand this routine in future.
> Should I remove it from the current version?

It's not too important either way.

> > These constraints don't agree with each other - the rate limits claim to
> > support 48kHz only, the rates setting tells a different story.

> At present I checked STA529(codec) only with 48Khz,I need to check with other data rates also.

It's fine to expand later but you should make sure that if you want to
say the device currently only works at 48kHz all the constraints say
that - the issue is the inconsistency.

> > Rather than passing the channel count through from the I2S driver you
> > could just get it directly here.

> Are you talking about this "struct spear13xx_runtime_data *prtd = runtime->private_data"
> Could you please elaborate little bit more.

Yes, you're passing through data that doesn't need to be passed through
since the DMA driver gets a hw_params() call too.