[PATCH v7 25/33] ASoC: qcom: qdsp6: q6afe: Split USB AFE dev_token param into separate API

[Wesley Cheng <quic_wcheng@quicinc.com>]

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 <quic_wcheng@quicinc.com>
---
 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;
-	}
-
 	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,
@@ -1463,7 +1484,7 @@ void q6afe_usb_port_prepare(struct q6afe_port *port,
 	pcfg->usb_cfg.num_channels = cfg->num_channels;
 	pcfg->usb_cfg.bit_width = cfg->bit_width;
 
-	afe_port_send_usb_dev_param(port, cfg);
+	afe_port_send_usb_params(port, cfg);
 }
 EXPORT_SYMBOL_GPL(q6afe_usb_port_prepare);
 
diff --git a/sound/soc/qcom/qdsp6/q6afe.h b/sound/soc/qcom/qdsp6/q6afe.h
index ef47b4ae9e27..2ce5ba9dba69 100644
--- a/sound/soc/qcom/qdsp6/q6afe.h
+++ b/sound/soc/qcom/qdsp6/q6afe.h
@@ -263,6 +263,7 @@ void q6afe_tdm_port_prepare(struct q6afe_port *port, struct q6afe_tdm_cfg *cfg);
 void q6afe_cdc_dma_port_prepare(struct q6afe_port *port,
 				struct q6afe_cdc_dma_cfg *cfg);
 
+int afe_port_send_usb_dev_param(struct q6afe_port *port, int cardidx, int pcmidx);
 int q6afe_port_set_sysclk(struct q6afe_port *port, int clk_id,
 			  int clk_src, int clk_root,
 			  unsigned int freq, int dir);