linux-kernel - Re: [PATCH 1/2] ASoC: intel: atom: Add period size constraint

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Date:   Wed, 29 Jul 2020 14:19:27 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Brent Lu <brent.lu@...el.com>
Cc:     alsa-devel@...a-project.org,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Daniel Stuart <daniel.stuart14@...il.com>,
        Yu-Hsuan Hsu <yuhsuan@...omium.org>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Sam McNally <sammc@...omium.org>,
        Damian van Soelen <dj.vsoelen@...il.com>
Subject: Re: [PATCH 1/2] ASoC: intel: atom: Add period size constraint

On Wed, Jul 29, 2020 at 07:03:04PM +0800, Brent Lu wrote:
> Use constraint to enforce the period sizes which are validated in
> Android BSP.
> 
> Signed-off-by: Brent Lu <brent.lu@...el.com>
> ---
>  sound/soc/intel/atom/sst-mfld-platform-pcm.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/sound/soc/intel/atom/sst-mfld-platform-pcm.c b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
> index 49b9f18..f614651 100644
> --- a/sound/soc/intel/atom/sst-mfld-platform-pcm.c
> +++ b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
> @@ -300,6 +300,16 @@ static void power_down_sst(struct sst_runtime_stream *stream)
>  	stream->ops->power(sst->dev, false);
>  }
>  
> +static const unsigned int media_period_size[] = {
> +	/* sizes validated on Android platform */

> +	240, 320, 960, 3072

Leave comma at the end.

> +};
> +
> +static const struct snd_pcm_hw_constraint_list constraints_media_period_size = {
> +	.count = ARRAY_SIZE(media_period_size),
> +	.list  = media_period_size,
> +};
> +
>  static int sst_media_open(struct snd_pcm_substream *substream,
>  		struct snd_soc_dai *dai)
>  {
> @@ -333,6 +343,11 @@ static int sst_media_open(struct snd_pcm_substream *substream,
>  	if (ret_val < 0)
>  		return ret_val;
>  
> +	/* Avoid using period size which is not validated */
> +	snd_pcm_hw_constraint_list(substream->runtime, 0,
> +			SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
> +			&constraints_media_period_size);
> +
>  	/* Make sure, that the period size is always even */
>  	snd_pcm_hw_constraint_step(substream->runtime, 0,
>  			   SNDRV_PCM_HW_PARAM_PERIODS, 2);
> -- 
> 2.7.4
> 

-- 
With Best Regards,
Andy Shevchenko