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SubjectRe: [PATCH v3 14/25] ASoC: qcom: qdsp6: Add support to q6afe dai driver
On Tue, Feb 13, 2018 at 04:58:26PM +0000, srinivas.kandagatla@linaro.org wrote:

> +static int q6hdmi_format_put(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct q6afe_dai_data *dai_data = kcontrol->private_data;
> + int value = ucontrol->value.integer.value[0];
> +
> + dai_data->port_config[AFE_PORT_HDMI_RX].hdmi.datatype = value;
> +
> + return 0;
> +}

No validation, and do we not need to tell a currently running stream if
the format changed on it (or block such changes if they're not going to
work, which seems more likely)?

> +static int q6hdmi_hw_params(struct snd_pcm_substream *substream,
> + struct snd_pcm_hw_params *params,
> + struct snd_soc_dai *dai)
> +{
> + struct q6afe_dai_data *dai_data = q6afe_get_dai_data(dai->dev);
> + int channels = params_channels(params);
> + struct q6afe_hdmi_cfg *hdmi = &dai_data->port_config[dai->id].hdmi;
> +
> + hdmi->sample_rate = params_rate(params);
> + switch (params_format(params)) {
> + case SNDRV_PCM_FORMAT_S16_LE:
> + hdmi->bit_width = 16;
> + break;
> + case SNDRV_PCM_FORMAT_S24_LE:
> + hdmi->bit_width = 24;
> + break;
> + }

This silently accepts invalid values.

> + /*refer to HDMI spec CEA-861-E: Table 28 Audio InfoFrame Data Byte 4*/

Coding style, spaces around the /* */.

> +static int q6afe_dai_startup(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct q6afe_dai_data *dai_data = q6afe_get_dai_data(dai->dev);
> +
> + dai_data->is_port_started[dai->id] = false;
> +
> + return 0;
> +}

If this is needed it makes me a bit worried that we've got some kind of
bug with not shutting things down properly somewhere - what's going on
here?

> +static void q6afe_dai_shutdown(struct snd_pcm_substream *substream,
> + struct snd_soc_dai *dai)
> +{
> + struct q6afe_dai_data *dai_data = q6afe_get_dai_data(dai->dev);
> + int rc;
> +
> + rc = q6afe_port_stop(dai_data->port[dai->id]);
> + if (rc < 0)
> + dev_err(dai->dev, "fail to close AFE port\n");

Better to print the error code so users have more information to debug
the problem.

> + .stream_name = "HDMI Playback",
> + .rates = SNDRV_PCM_RATE_48000 |
> + SNDRV_PCM_RATE_96000 |
> + SNDRV_PCM_RATE_192000,

Indentation again.

> +static int q6afe_of_xlate_dai_name(struct snd_soc_component *component,
> + struct of_phandle_args *args,
> + const char **dai_name)
> +{
> + int id = args->args[0];
> + int i, ret = -EINVAL;

Coding style, don't mix initialization in with other variable
declarations on the same line like this.

> +int q6afe_dai_dev_remove(struct device *dev)
> +{
> + return 0;
> +}

Remove empty functions, if they can't be removed it's probably not OK
for them to be empty either.
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