linux-kernel - Re: [PATCH v2 2/2] ASoC: fsl: imx-wm8962: Grant hw

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Date:	Mon, 9 Dec 2013 17:56:40 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Nicolin Chen <b42378@...escale.com>
Cc:	lgirdwood@...il.com, alsa-devel@...a-project.org, tiwai@...e.de,
	perex@...ex.cz, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ASoC: fsl: imx-wm8962: Grant hw_params/free()
 permission to control FLL

On Fri, Dec 06, 2013 at 11:38:29PM +0800, Nicolin Chen wrote:

> +static int imx_hifi_hw_free(struct snd_pcm_substream *substream)
> +{
> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> +	struct snd_soc_dai *codec_dai = rtd->codec_dai;
> +
> +	/* Don't diable FLL if still having multiple substreams running */
> +	if (codec_dai->active != 1)
> +		return 0;
> +
> +	return imx_wm8962_disable_fll(codec_dai);

This will still disable the FLL if there's an analogue bypass path
active.  I'd suggest changing enable() and disable() to reference count.

> +		if (dapm->bias_level == SND_SOC_BIAS_STANDBY)
> +			return imx_wm8962_enable_fll(codec_dai, 44100,
> +						SNDRV_PCM_FORMAT_S16_LE);

It might be slightly nicer to keep the static variable for the frequency
- that way if we start up due to set_bias_level() we'll keep the last
rate played which might be more likely to avoid locking playbacks out.
Very minor thing though, I wouldn't worry about it.

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