static int intel_hw_params()

in intel.c [813:886]

• 57 lines of code
• 7 McCabe index (conditional complexity)

static int intel_hw_params(struct snd_pcm_substream *substream,
			   struct snd_pcm_hw_params *params,
			   struct snd_soc_dai *dai)
{
	struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
	struct sdw_intel *sdw = cdns_to_intel(cdns);
	struct sdw_cdns_dma_data *dma;
	struct sdw_cdns_pdi *pdi;
	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;

	pdi = sdw_cdns_alloc_pdi(cdns, &cdns->pcm, ch, dir, dai->id);

	if (!pdi) {
		ret = -EINVAL;
		goto error;
	}

	/* do run-time configurations for SHIM, ALH and PDI/PORT */
	intel_pdi_shim_configure(sdw, pdi);
	intel_pdi_alh_configure(sdw, pdi);
	sdw_cdns_config_stream(cdns, ch, dir, pdi);

	/* store pdi and hw_params, may be needed in prepare step */
	dma->paused = false;
	dma->suspended = false;
	dma->pdi = pdi;
	dma->hw_params = params;

	/* Inform DSP about PDI stream number */
	ret = intel_params_stream(sdw, substream->stream, dai, params,
				  sdw->instance,
				  pdi->intel_alh_id);
	if (ret)
		goto error;

	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 = pdi->num;
	pconfig->ch_mask = (1 << ch) - 1;

	ret = sdw_stream_add_master(&cdns->bus, &sconfig,
				    pconfig, 1, dma->stream);
	if (ret)
		dev_err(cdns->dev, "add master to stream failed:%d\n", ret);

	kfree(pconfig);
error:
	return ret;
}