> +static int q6dma_hw_params(struct snd_pcm_substream *substream,
> + struct snd_pcm_hw_params *params,
> + struct snd_soc_dai *dai)
> +{
> + struct q6apm_bedai_data *dai_data = dev_get_drvdata(dai->dev);
> + struct q6apm_cdc_dma_cfg *cfg = &dai_data->port_config[dai->id].dma_cfg;
> +
> + cfg->bit_width = params_width(params);
> + cfg->sample_rate = params_rate(params);
> + cfg->num_channels = params_channels(params);
> +
> + switch (params_format(params)) {
> + case SNDRV_PCM_FORMAT_S16_LE:
> + dai_data->bits_per_sample[dai->id] = 16;
> + break;
> + case SNDRV_PCM_FORMAT_S24_LE:
> + dai_data->bits_per_sample[dai->id] = 24;
> + break;
default:
return -EINVAL;
?
> + }
> +
> + return 0;
> +}
> +
> +static void q6apm_bedai_shutdown(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct q6apm_bedai_data *dai_data = dev_get_drvdata(dai->dev);
> + int rc;
> +
> + if (!dai_data->is_port_started[dai->id])
> + return;
> + rc = q6apm_graph_stop(dai_data->graph[dai->id]);
> + if (rc < 0)
> + dev_err(dai->dev, "fail to close APM port (%d)\n", rc);
> +
> + q6apm_graph_close(dai_data->graph[dai->id]);
> + dai_data->is_port_started[dai->id] = false;
difficult to follow, this mixes '!start', 'stop', 'close'
> +
> +}
> +
> +static int q6apm_bedai_prepare(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct q6apm_bedai_data *dai_data = dev_get_drvdata(dai->dev);
> + struct q6apm_cdc_dma_cfg *cfg = &dai_data->port_config[dai->id].dma_cfg;
> + int graph_id = dai->id;
> + int rc;
> + int ret;
> + struct q6apm_graph *graph;
> +
> + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> + graph = q6apm_graph_open(dai->dev, NULL, dai->dev, graph_id);
> + if (IS_ERR(graph)) {
> + dev_err(dai->dev, "Failed to open graph (%d)\n",
> + graph_id);
> + ret = PTR_ERR(graph);
> + return ret;
> + }
> + dai_data->graph[graph_id] = graph;
> + }
> +
> + rc = q6apm_graph_media_format_pcm(dai_data->graph[dai->id],
> + substream->stream, cfg->sample_rate,
> + cfg->num_channels, NULL, cfg->bit_width);
> +
> + rc = q6apm_graph_prepare(dai_data->graph[dai->id]);
any good static analyzer would tell you you didn't test rc before overriding it..
this looks rather questionable.
> + rc = q6apm_graph_start(dai_data->graph[dai->id]);
> + if (rc < 0) {
> + dev_err(dai->dev, "fail to start APM port %x\n", dai->id);
> + return rc;
> + }
> + dai_data->is_port_started[dai->id] = true;
> +
> + return 0;
> +}
