linux-kernel - Re: [PATCH 4/5] soundwire: intel: add sdw_stream

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Date:   Tue, 14 Jan 2020 11:44:41 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH 4/5] soundwire: intel: add sdw_stream_setup helper for
 .startup callback

On 10-01-20, 15:46, Pierre-Louis Bossart wrote:
> From: Rander Wang <rander.wang@...ux.intel.com>
> 
> The sdw stream is allocated and stored in dai to share the sdw runtime
> information.
> 
> Signed-off-by: Rander Wang <rander.wang@...ux.intel.com>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
>  drivers/soundwire/intel.c | 65 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 65 insertions(+)
> 
> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
> index aa80c46156cb..f4554386d832 100644
> --- a/drivers/soundwire/intel.c
> +++ b/drivers/soundwire/intel.c
> @@ -617,6 +617,69 @@ static int intel_post_bank_switch(struct sdw_bus *bus)
>   * DAI routines
>   */
>  
> +static int sdw_stream_setup(struct snd_pcm_substream *substream,
> +			    struct snd_soc_dai *dai)
> +{
> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> +	struct sdw_stream_runtime *sdw_stream = NULL;
> +	char *name;
> +	int i, ret;
> +
> +	name = kzalloc(32, GFP_KERNEL);
> +	if (!name)
> +		return -ENOMEM;
> +
> +	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +		snprintf(name, 32, "%s-Playback", dai->name);
> +	else
> +		snprintf(name, 32, "%s-Capture", dai->name);

How about use DAI_SIZE instead of 32 here and above few places? Lets not
code number like this please

> +
> +	sdw_stream = sdw_alloc_stream(name);
> +	if (!sdw_stream) {
> +		dev_err(dai->dev, "alloc stream failed for DAI %s", dai->name);
> +		ret = -ENOMEM;
> +		goto error;
> +	}
> +
> +	/* Set stream pointer on CPU DAI */
> +	ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
> +	if (ret < 0) {
> +		dev_err(dai->dev, "failed to set stream pointer on cpu dai %s",
> +			dai->name);
> +		goto release_stream;
> +	}
> +
> +	/* Set stream pointer on all CODEC DAIs */
> +	for (i = 0; i < rtd->num_codecs; i++) {
> +		ret = snd_soc_dai_set_sdw_stream(rtd->codec_dais[i], sdw_stream,
> +						 substream->stream);
> +		if (ret < 0) {
> +			dev_err(dai->dev, "failed to set stream pointer on codec dai %s",
> +				rtd->codec_dais[i]->name);
> +			goto release_stream;
> +		}
> +	}
> +
> +	return 0;
> +
> +release_stream:
> +	sdw_release_stream(sdw_stream);
> +error:
> +	kfree(name);
> +	return ret;
> +}
> +
> +static int intel_startup(struct snd_pcm_substream *substream,
> +			 struct snd_soc_dai *dai)
> +{
> +	/*
> +	 * TODO: add pm_runtime support here, the startup callback
> +	 * will make sure the IP is 'active'
> +	 */
> +
> +	return sdw_stream_setup(substream, dai);
> +}
> +
>  static int intel_hw_params(struct snd_pcm_substream *substream,
>  			   struct snd_pcm_hw_params *params,
>  			   struct snd_soc_dai *dai)
> @@ -796,6 +859,7 @@ static int intel_pdm_set_sdw_stream(struct snd_soc_dai *dai,
>  }
>  
>  static const struct snd_soc_dai_ops intel_pcm_dai_ops = {
> +	.startup = intel_startup,
>  	.hw_params = intel_hw_params,
>  	.prepare = intel_prepare,
>  	.trigger = intel_trigger,
> @@ -805,6 +869,7 @@ static const struct snd_soc_dai_ops intel_pcm_dai_ops = {
>  };
>  
>  static const struct snd_soc_dai_ops intel_pdm_dai_ops = {
> +	.startup = intel_startup,
>  	.hw_params = intel_hw_params,
>  	.prepare = intel_prepare,
>  	.trigger = intel_trigger,
> -- 
> 2.20.1

-- 
~Vinod