1 Aug
2024
1 Aug
'24
10:40 a.m.
+static int q6usb_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,struct snd_soc_dai *dai)+{
- struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
- struct q6afe_port *q6usb_afe;
- struct snd_soc_usb_device *sdev;
- int ret;
- /* No active chip index */
- if (list_empty(&data->devices))
return -EINVAL;- mutex_lock(&data->mutex);
- sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
- q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
- if (IS_ERR(q6usb_afe))
goto out;- /* Notify audio DSP about the devices being offloaded */
- ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
sdev->pcm_idx);+out:
- mutex_unlock(&data->mutex);
- return ret;
+}
Humm, multiple questions here
a) is this intentional that the params are not used in a hw_params routine?
b) if yes, could this be replaced by a .prepare callback
c) along the same lines as b), is suspend-resume during playback supported? Usually this is handled with a .prepare callback to restore connections.
+static const struct snd_soc_dai_ops q6usb_ops = {
- .hw_params = q6usb_hw_params,
+};