linux-kernel - Re: [PATCH 03/19] soundwire: amd: register sdw controller dai ops

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Date:   Fri, 13 Jan 2023 11:13:46 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "Mukunda,Vijendar" <vijendar.mukunda@....com>, broonie@...nel.org,
        vkoul@...nel.org, alsa-devel@...a-project.org
Cc:     Basavaraj.Hiregoudar@....com, Sunil-kumar.Dommati@....com,
        Mario.Limonciello@....com, Mastan.Katragadda@....com,
        arungopal.kondaveeti@....com,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/19] soundwire: amd: register sdw controller dai ops



>>> +static int amd_sdwc_hw_params(struct snd_pcm_substream *substream,
>>> +			      struct snd_pcm_hw_params *params,
>>> +			      struct snd_soc_dai *dai)
>>> +{
>>> +	struct amd_sdwc_ctrl *ctrl = snd_soc_dai_get_drvdata(dai);
>>> +	struct sdw_amd_dma_data *dma;
>>> +	struct sdw_stream_config sconfig;
>>> +	struct sdw_port_config *pconfig;
>>> +	int ch, dir;
>>> +	int ret;
>>> +
>>> +	dma = snd_soc_dai_get_dma_data(dai, substream);
>>> +	if (!dma)
>>> +		return -EIO;
>>> +
>>> +	ch = params_channels(params);
>>> +	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
>>> +		dir = SDW_DATA_DIR_RX;
>>> +	else
>>> +		dir = SDW_DATA_DIR_TX;
>>> +	dev_dbg(ctrl->dev, "%s: dir:%d dai->id:0x%x\n", __func__, dir, dai->id);
>>> +	dma->hw_params = params;
>>> +
>>> +	sconfig.direction = dir;
>>> +	sconfig.ch_count = ch;
>>> +	sconfig.frame_rate = params_rate(params);
>>> +	sconfig.type = dma->stream_type;
>>> +
>>> +	sconfig.bps = snd_pcm_format_width(params_format(params));
>>> +
>>> +	/* Port configuration */
>>> +	pconfig = kzalloc(sizeof(*pconfig), GFP_KERNEL);
>>> +	if (!pconfig) {
>>> +		ret =  -ENOMEM;
>>> +		goto error;
>>> +	}
>>> +
>>> +	pconfig->num = dai->id;
>>> +	pconfig->ch_mask = (1 << ch) - 1;
>>> +	ret = sdw_stream_add_master(&ctrl->bus, &sconfig,
>>> +				    pconfig, 1, dma->stream);
>>> +	if (ret)
>>> +		dev_err(ctrl->dev, "add master to stream failed:%d\n", ret);
>>> +
>>> +	kfree(pconfig);
>>> +error:
>>> +	return ret;
>>> +}
>> This looks inspired from intel.c, but you are not programming ANY
>> registers here. is this intentional?
> We don't have any additional registers to be programmed like intel.

ok, this is worthy of a comment.


>>> +static const struct snd_soc_dai_ops amd_sdwc_dai_ops = {
>>> +	.hw_params = amd_sdwc_hw_params,
>>> +	.hw_free = amd_sdwc_hw_free,
>>> +	.set_stream = amd_pcm_set_sdw_stream,
>> In the first patch there was support for PDM exposed, but here it's PDM
>> only?
> Didn't get your question.
> First patch talks about creating dev nodes for Soundwire managers and
> ACP PDM controller based on ACP pin config.

Sorry, my comment has a typo.

I meant that the first patch exposed PDM support but here you only have PCM?