On 10/17/23 15:00, Wesley Cheng wrote: > The QC ADSP is able to support USB playback endpoints, so that the main playback only? > application processor can be placed into lower CPU power modes. This adds > the required AFE port configurations and port start command to start an > audio session. > > Specifically, the QC ADSP can support all potential endpoints that are > exposed by the audio data interface. This includes, feedback endpoints > (both implicit and explicit) as well as the isochronous (data) endpoints. implicit feedback means support for capture. This is confusing... > +static int q6usb_hw_params(struct snd_pcm_substream *substream, > + struct snd_pcm_hw_params *params, > + struct snd_soc_dai *dai) > +{ > + struct q6afe_dai_data *dai_data = dev_get_drvdata(dai->dev); > + int channels = params_channels(params); > + int rate = params_rate(params); > + struct q6afe_usb_cfg *usb = &dai_data->port_config[dai->id].usb_audio; > + > + usb->sample_rate = rate; > + usb->num_channels = channels; > + > + switch (params_format(params)) { > + case SNDRV_PCM_FORMAT_U16_LE: > + case SNDRV_PCM_FORMAT_S16_LE: > + case SNDRV_PCM_FORMAT_SPECIAL: what does FORMAT_SPECIAL mean? the only other reference I see to this is related to SLIMbus, not sure how this is related? > + usb->bit_width = 16; > + break; > + case SNDRV_PCM_FORMAT_S24_LE: > + case SNDRV_PCM_FORMAT_S24_3LE: > + usb->bit_width = 24; > + break; > + case SNDRV_PCM_FORMAT_S32_LE: > + usb->bit_width = 32; > + break; > + default: > + dev_err(dai->dev, "%s: invalid format %d\n", > + __func__, params_format(params)); > + return -EINVAL; > + } > + > + return 0; > +} > @@ -617,6 +655,9 @@ static const struct snd_soc_dapm_route q6afe_dapm_routes[] = { > {"TX_CODEC_DMA_TX_5", NULL, "TX_CODEC_DMA_TX_5 Capture"}, > {"RX_CODEC_DMA_RX_6 Playback", NULL, "RX_CODEC_DMA_RX_6"}, > {"RX_CODEC_DMA_RX_7 Playback", NULL, "RX_CODEC_DMA_RX_7"}, > + > + /* USB playback AFE port receives data for playback, hence use the RX port */ > + {"USB Playback", NULL, "USB_RX"}, Capture for implicit feedback? > }; > > static int msm_dai_q6_dai_probe(struct snd_soc_dai *dai) > @@ -644,6 +685,18 @@ static int msm_dai_q6_dai_remove(struct snd_soc_dai *dai) > return 0; > } > > +static const struct snd_soc_dai_ops q6usb_ops = { > + .probe = msm_dai_q6_dai_probe, > + .prepare = q6afe_dai_prepare, > + .hw_params = q6usb_hw_params, this is rather confusing with two different layers used for hw_params and prepare? Additional comments or explanations wouldn't hurt. > + .shutdown = q6afe_dai_shutdown, > + /* > + * Startup callback not needed, as AFE port start command passes the PCM > + * parameters within the AFE command, which is provided by the PCM core > + * during the prepare() stage. This doesn't really explain why you need a shutdown? > + * struct afe_param_id_usb_audio_dev_latency_mode > + * @cfg_minor_version: Minor version used for tracking USB audio device > + * configuration. > + * Supported values: > + * AFE_API_MINOR_VERSION_USB_AUDIO_LATENCY_MODE > + * @mode: latency mode for the USB audio device what are the different latency modes? and is this related to the latency reporting that was added in the USB2 audio class IIRC? > +static int afe_port_send_usb_dev_param(struct q6afe_port *port, struct q6afe_usb_cfg *cfg) > +{ > + union afe_port_config *pcfg = &port->port_cfg; > + struct afe_param_id_usb_audio_dev_params usb_dev; > + struct afe_param_id_usb_audio_dev_lpcm_fmt lpcm_fmt; > + struct afe_param_id_usb_audio_svc_interval svc_int; > + int ret = 0; useless init overridden... > + > + if (!pcfg) { > + dev_err(port->afe->dev, "%s: Error, no configuration data\n", __func__); > + ret = -EINVAL; > + goto exit; > + } > + > + memset(&usb_dev, 0, sizeof(usb_dev)); > + memset(&lpcm_fmt, 0, sizeof(lpcm_fmt)); > + memset(&svc_int, 0, sizeof(svc_int)); > + > + usb_dev.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG; > + ret = q6afe_port_set_param_v2(port, &usb_dev, .... here > + AFE_PARAM_ID_USB_AUDIO_DEV_PARAMS, > + AFE_MODULE_AUDIO_DEV_INTERFACE, sizeof(usb_dev)); > + if (ret) { > + dev_err(port->afe->dev, "%s: AFE device param cmd failed %d\n", > + __func__, ret); > + goto exit; > + } > + > + lpcm_fmt.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG; > + lpcm_fmt.endian = pcfg->usb_cfg.endian; > + ret = q6afe_port_set_param_v2(port, &lpcm_fmt, > + AFE_PARAM_ID_USB_AUDIO_DEV_LPCM_FMT, > + AFE_MODULE_AUDIO_DEV_INTERFACE, sizeof(lpcm_fmt)); > + if (ret) { > + dev_err(port->afe->dev, "%s: AFE device param cmd LPCM_FMT failed %d\n", > + __func__, ret); > + goto exit; > + } > + > + svc_int.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG; > + svc_int.svc_interval = pcfg->usb_cfg.service_interval; > + ret = q6afe_port_set_param_v2(port, &svc_int, > + AFE_PARAM_ID_USB_AUDIO_SVC_INTERVAL, > + AFE_MODULE_AUDIO_DEV_INTERFACE, sizeof(svc_int)); > + if (ret) > + dev_err(port->afe->dev, "%s: AFE device param cmd svc_interval failed %d\n", > + __func__, ret); > + > +exit: > + return ret; > +} > -#define AFE_PORT_MAX 129 > +#define AFE_PORT_MAX 137 does this mean 8 ports are reserved for USB? Or is this 137 just a random index coming from the AFE design?