ASoC: q6dsp: q6afe: add global q6afe waitqueue

In some cases like clocks q6afe would have to process commands
without an associated q6afe port, in such cases waitqueue is
required at global level to wait for the command to finish.
This patch also adds the command result to go with this waitqueue.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200910101732.23484-5-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/qdsp6/q6afe.c

@@ -362,6 +362,8 @@ struct q6afe {
 	struct device *dev;
 	struct q6core_svc_api_info ainfo;
 	struct mutex lock;
+	struct aprv2_ibasic_rsp_result_t result;
+	wait_queue_head_t wait;
 	struct list_head port_list;
 	spinlock_t port_list_lock;
 };
@@ -905,11 +907,20 @@ static int afe_apr_send_pkt(struct q6afe *afe, struct apr_pkt *pkt,
 			    struct q6afe_port *port, uint32_t rsp_opcode)
 {
 	wait_queue_head_t *wait = &port->wait;
+	struct aprv2_ibasic_rsp_result_t *result;
 	int ret;
 
 	mutex_lock(&afe->lock);
-	port->result.opcode = 0;
-	port->result.status = 0;
+	if (port) {
+		wait = &port->wait;
+		result = &port->result;
+	} else {
+		result = &afe->result;
+		wait = &afe->wait;
+	}
+
+	result->opcode = 0;
+	result->status = 0;
 
 	ret = apr_send_pkt(afe->apr, pkt);
 	if (ret < 0) {
@@ -918,13 +929,13 @@ static int afe_apr_send_pkt(struct q6afe *afe, struct apr_pkt *pkt,
 		goto err;
 	}
 
-	ret = wait_event_timeout(*wait, (port->result.opcode == rsp_opcode),
+	ret = wait_event_timeout(*wait, (result->opcode == rsp_opcode),
 				 msecs_to_jiffies(TIMEOUT_MS));
 	if (!ret) {
 		ret = -ETIMEDOUT;
-	} else if (port->result.status > 0) {
+	} else if (result->status > 0) {
 		dev_err(afe->dev, "DSP returned error[%x]\n",
-			port->result.status);
+			result->status);
 		ret = -EINVAL;
 	} else {
 		ret = 0;
@@ -1594,6 +1605,7 @@ static int q6afe_probe(struct apr_device *adev)
 	q6core_get_svc_api_info(adev->svc_id, &afe->ainfo);
 	afe->apr = adev;
 	mutex_init(&afe->lock);
+	init_waitqueue_head(&afe->wait);
 	afe->dev = dev;
 	INIT_LIST_HEAD(&afe->port_list);
 	spin_lock_init(&afe->port_list_lock);