Bluetooth: Add btrealtek data struct and improve SCO sound quality of RTK chips

index 2c441bda390a..ebf0101c959b 100644
@@ -47,6 +47,27 @@ struct rtl_vendor_config {
 	struct rtl_vendor_config_entry entry[];
 } __packed;
 
+enum {
+	REALTEK_ALT6_CONTINUOUS_TX_CHIP,
+
+	__REALTEK_NUM_FLAGS,
+};
+
+struct btrealtek_data {
+	DECLARE_BITMAP(flags, __REALTEK_NUM_FLAGS);
+};
+
+#define btrealtek_set_flag(hdev, nr)					\
+	do {								\
+		struct btrealtek_data *realtek = hci_get_priv((hdev));	\
+		set_bit((nr), realtek->flags);				\
+	} while (0)
+
+#define btrealtek_get_flag(hdev)					\
+	(((struct btrealtek_data *)hci_get_priv(hdev))->flags)
+
+#define btrealtek_test_flag(hdev, nr)	test_bit((nr), btrealtek_get_flag(hdev))
+
 #if IS_ENABLED(CONFIG_BT_RTL)
 
 struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,

index 271963805a38..4243936c0583 100644
@@ -3755,6 +3755,9 @@ static int btusb_probe(struct usb_interface *intf,
 		/* Override the rx handlers */
 		data->recv_event = btusb_recv_event_intel;
 		data->recv_bulk = btusb_recv_bulk_intel;
+	} else if (id->driver_info & BTUSB_REALTEK) {
+		/* Allocate extra space for Realtek device */
+		priv_size += sizeof(struct btrealtek_data);
 	}
 
 	data->recv_acl = hci_recv_frame;

index fb52313a1d45..69c3fe649ca7 100644
@@ -781,6 +781,13 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
 	case CHIP_ID_8852C:
 		set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
 		set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
+
+		/* RTL8852C needs to transmit mSBC data continuously without
+		 * the zero length of USB packets for the ALT 6 supported chips
+		 */
+		if (btrtl_dev->project_id == CHIP_ID_8852C)
+			btrealtek_set_flag(hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP);
+
 		hci_set_aosp_capable(hdev);
 		break;
 	default:

index 4243936c0583..4d787a455c00 100644
@@ -632,6 +632,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
 #define BTUSB_TX_WAIT_VND_EVT	13
 #define BTUSB_WAKEUP_AUTOSUSPEND	14
 #define BTUSB_USE_ALT3_FOR_WBS	15
+#define BTUSB_ALT6_CONTINUOUS_TX	16
 
 struct btusb_data {
 	struct hci_dev       *hdev;

@@ -1276,11 +1277,17 @@ static void btusb_isoc_complete(struct urb *urb)
 static inline void __fill_isoc_descriptor_msbc(struct urb *urb, int len,
 					       int mtu, struct btusb_data *data)
 {
-	int i, offset = 0;
+	int i = 0, offset = 0;
 	unsigned int interval;
 
 	BT_DBG("len %d mtu %d", len, mtu);
 
+	/* For mSBC ALT 6 settings some chips need to transmit the data
+	 * continuously without the zero length of USB packets.
+	 */
+	if (test_bit(BTUSB_ALT6_CONTINUOUS_TX, &data->flags))
+		goto ignore_usb_alt6_packet_flow;
+
 	/* For mSBC ALT 6 setting the host will send the packet at continuous
 	 * flow. As per core spec 5, vol 4, part B, table 2.1. For ALT setting
 	 * 6 the HCI PACKET INTERVAL should be 7.5ms for every usb packets.

@@ -1300,6 +1307,7 @@ static inline void __fill_isoc_descriptor_msbc(struct urb *urb, int len,
 		urb->iso_frame_desc[i].length = offset;
 	}
 
+ignore_usb_alt6_packet_flow:
 	if (len && i < BTUSB_MAX_ISOC_FRAMES) {
 		urb->iso_frame_desc[i].offset = offset;
 		urb->iso_frame_desc[i].length = len;

@@ -2315,6 +2323,19 @@ static int btusb_send_frame_intel(struct hci_dev *hdev, struct sk_buff *skb)
 	return -EILSEQ;
 }
 
+static int btusb_setup_realtek(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+	int ret;
+
+	ret = btrtl_setup_realtek(hdev);
+
+	if (btrealtek_test_flag(data->hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP))
+		set_bit(BTUSB_ALT6_CONTINUOUS_TX, &data->flags);
+
+	return ret;
+}
+
 /* UHW CR mapping */
 #define MTK_BT_MISC		0x70002510
 #define MTK_BT_SUBSYS_RST	0x70002610

@@ -3916,7 +3937,7 @@ static int btusb_probe(struct usb_interface *intf,
 
 	if (IS_ENABLED(CONFIG_BT_HCIBTUSB_RTL) &&
 	    (id->driver_info & BTUSB_REALTEK)) {
-		hdev->setup = btrtl_setup_realtek;
+		hdev->setup = btusb_setup_realtek;
 		hdev->shutdown = btrtl_shutdown_realtek;
 		hdev->cmd_timeout = btusb_rtl_cmd_timeout;