Hi Pierre,

On 10/17/2023 3:39 PM, Pierre-Louis Bossart wrote:

On 10/17/23 15:01, Wesley Cheng wrote:

quoted

The Q6USB backend can carry information about the available USB SND cards
and PCM devices discovered on the USB bus.  The dev_token field is used by
the audio DSP to notify the USB offload driver of which card and PCM index
to enable playback on.  Separate this into a dedicated API, so the USB
backend can set the dev_token accordingly.  The audio DSP does not utilize
this information until the AFE port start command is sent, which is done
during the PCM prepare phase.

Signed-off-by: Wesley Cheng <redacted>
---
  sound/soc/qcom/qdsp6/q6afe.c | 49 +++++++++++++++++++++++++-----------
  sound/soc/qcom/qdsp6/q6afe.h |  1 +
  2 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/sound/soc/qcom/qdsp6/q6afe.c b/sound/soc/qcom/qdsp6/q6afe.c
index 72c4e6fe20c4..f09a756246f8 100644
--- a/sound/soc/qcom/qdsp6/q6afe.c
+++ b/sound/soc/qcom/qdsp6/q6afe.c

@@ -1394,10 +1394,42 @@ void q6afe_tdm_port_prepare(struct q6afe_port *port,
  }
  EXPORT_SYMBOL_GPL(q6afe_tdm_port_prepare);
  
-static int afe_port_send_usb_dev_param(struct q6afe_port *port, struct q6afe_usb_cfg *cfg)
+/**
+ * afe_port_send_usb_dev_param() - Send USB dev token
+ *
+ * @port: Instance of afe port
+ * @cardidx: USB SND card index to reference
+ * @pcmidx: USB SND PCM device index to reference
+ *
+ * The USB dev token carries information about which USB SND card instance and
+ * PCM device to execute the offload on.  This information is carried through
+ * to the stream enable QMI request, which is handled by the offload class
+ * driver.  The information is parsed to determine which USB device to query
+ * the required resources for.
+ */
+int afe_port_send_usb_dev_param(struct q6afe_port *port, int cardidx, int pcmidx)
  {
-	union afe_port_config *pcfg = &port->port_cfg;
  	struct afe_param_id_usb_audio_dev_params usb_dev;
+	int ret;
+
+	memset(&usb_dev, 0, sizeof(usb_dev));
+
+	usb_dev.cfg_minor_version = AFE_API_MINOR_VERSION_USB_AUDIO_CONFIG;
+	usb_dev.dev_token = (cardidx << 16) | (pcmidx << 8);
+	ret = q6afe_port_set_param_v2(port, &usb_dev,
+				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);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(afe_port_send_usb_dev_param);
+
+static int afe_port_send_usb_params(struct q6afe_port *port, struct q6afe_usb_cfg *cfg)
+{
+	union afe_port_config *pcfg = &port->port_cfg;
  	struct afe_param_id_usb_audio_dev_lpcm_fmt lpcm_fmt;
  	struct afe_param_id_usb_audio_svc_interval svc_int;
  	int ret = 0;

@@ -1408,20 +1440,9 @@ static int afe_port_send_usb_dev_param(struct q6afe_port *port, struct q6afe_usb
  		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,
-				      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;
-	}
-

this feels like a questionable patch split. Why not introduce the new
helper earlier and avoid adding code then modifying the same code?

Let me see if I can squash this with the change that adds the USB AFE port.

Thanks
Wesley Cheng