ASoC: SOF: ipc4: Handle compressed drain done notification from firmware

The decoder module sends a drain done notification when the last chunk of
the stream after the EOS from host has been decoded.

The notification is a module notification with 0xc0c0 as magic number in
event_id upper 16 bit.

Call sof_ipc4_compr_drain_done() when the notification arrives to handle
it.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

include/sound/sof/ipc4/header.h

@@ -622,9 +622,10 @@ struct sof_ipc4_notify_module_data {
  * The event_data contains the struct sof_ipc4_control_msg_payload of the control
  * which sent the notification.
  */
-#define SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_MAGIC_MASK		GENMASK(31, 16)
+#define SOF_IPC4_NOTIFY_MODULE_EVENTID_SOF_MAGIC_MASK		GENMASK(31, 16)
 #define SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_MAGIC_VAL		0xA15A0000
 #define SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_PARAMID_MASK	GENMASK(15, 0)
+#define SOF_IPC4_NOTIFY_MODULE_EVENTID_COMPR_MAGIC_VAL		0xC0C00000
 
 /*
  * Macros for creating struct sof_ipc4_module_init_ext_init payload

sound/soc/sof/ipc4.c

@@ -699,12 +699,20 @@ static void sof_ipc4_module_notification_handler(struct snd_sof_dev *sdev,
 	}
 
 	/* Handle ALSA kcontrol notification */
-	if ((data->event_id & SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_MAGIC_MASK) ==
-	    SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_MAGIC_VAL) {
-		const struct sof_ipc_tplg_ops *tplg_ops = sdev->ipc->ops->tplg;
+	switch (data->event_id & SOF_IPC4_NOTIFY_MODULE_EVENTID_SOF_MAGIC_MASK) {
+	case SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_MAGIC_VAL:
+		{
+			const struct sof_ipc_tplg_ops *tplg_ops = sdev->ipc->ops->tplg;
 
-		if (tplg_ops->control->update)
-			tplg_ops->control->update(sdev, ipc4_msg);
+			if (tplg_ops->control->update)
+				tplg_ops->control->update(sdev, ipc4_msg);
+		}
+		break;
+	case SOF_IPC4_NOTIFY_MODULE_EVENTID_COMPR_MAGIC_VAL:
+		sof_ipc4_compr_drain_done(sdev, ipc4_msg);
+		break;
+	default:
+		break;
 	}
 }