Re: [PATCH v8 19/22] ASoC: qdsp6: audioreach: add q6apm-dai support

On 27/09/2021 17:25, Pierre-Louis Bossart wrote:

quoted

+static int q6apm_dai_prepare(struct snd_soc_component *component,
+			     struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct q6apm_dai_rtd *prtd = runtime->private_data;
+	struct audioreach_module_config cfg;
+	struct device *dev = component->dev;
+	struct q6apm_dai_data *pdata;
+	int ret;
+
+	pdata = snd_soc_component_get_drvdata(component);
+	if (!pdata)
+		return -EINVAL;
+
+	if (!prtd || !prtd->graph) {
+		dev_err(dev, "%s: private data null or audio client freed\n", __func__);
+		return -EINVAL;
+	}
+
+	cfg.direction = substream->stream;
+	cfg.sample_rate = runtime->rate;
+	cfg.num_channels = runtime->channels;
+	cfg.bit_width = prtd->bits_per_sample;
+
+	prtd->pcm_count = snd_pcm_lib_period_bytes(substream);
+	prtd->pos = 0;
+	/* rate and channels are sent to audio driver */
+	ret = q6apm_graph_media_format_shmem(prtd->graph, &cfg);
+	if (ret < 0) {
+		dev_err(dev, "%s: q6apm_open_write failed\n", __func__);
+		return ret;
+	}
+
+	ret = q6apm_graph_media_format_pcm(prtd->graph, &cfg);
+	if (ret < 0)
+		dev_err(dev, "%s: CMD Format block failed\n", __func__);
+
+	ret = q6apm_map_memory_regions(prtd->graph, substream->stream, prtd->phys,
+				       (prtd->pcm_size / prtd->periods), prtd->periods);
+
+	if (ret < 0) {
+		dev_err(dev, "Audio Start: Buffer Allocation failed rc = %d\n",	ret);
+		return -ENOMEM;
+	}
+
+	ret = q6apm_graph_prepare(prtd->graph);
+	if (ret) {
+		dev_err(dev, "Failed to prepare Graph %d\n", ret);
+		return ret;
+	}
+
+	ret = q6apm_graph_start(prtd->graph);
+	if (ret) {
+		dev_err(dev, "Failed to Start Graph %d\n", ret);
+		return ret;
+	}
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+		int i;
+		/* Queue the buffers for Capture ONLY after graph is started */
+		for (i = 0; i < runtime->periods; i++)
+			q6apm_read(prtd->graph);
+
+	}
+
+	prtd->state = Q6APM_STREAM_RUNNING;

you should probably explain why a stream moves to the 'RUNNING' state in
a .prepare() callback, instead of TRIGGER_START?

Sure, will add a comment,

--srini

quoted

+
+	return 0;
+}
+
+static int q6apm_dai_trigger(struct snd_soc_component *component,
+			     struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct q6apm_dai_rtd *prtd = runtime->private_data;
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		 /* start writing buffers for playback only as we already queued capture buffers */
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			ret = q6apm_write_async(prtd->graph, prtd->pcm_count, 0, 0, 0);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		/* TODO support be handled via SoftPause Module */
+		prtd->state = Q6APM_STREAM_STOPPED;
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}