From patchwork Tue Sep 13 10:02:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hilda Wu X-Patchwork-Id: 605378 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 661AAC54EE9 for ; Tue, 13 Sep 2022 10:03:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230399AbiIMKDI (ORCPT ); Tue, 13 Sep 2022 06:03:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230088AbiIMKDH (ORCPT ); Tue, 13 Sep 2022 06:03:07 -0400 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id DF8C157E09; Tue, 13 Sep 2022 03:03:03 -0700 (PDT) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 28DA2Um54014143, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36505.realtek.com.tw[172.21.6.25]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 28DA2Um54014143 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 13 Sep 2022 18:02:30 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36505.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 13 Sep 2022 18:02:50 +0800 Received: from localhost.localdomain (172.21.132.192) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Tue, 13 Sep 2022 18:02:50 +0800 From: To: CC: , , , , , , , , Subject: [PATCH v2 1/3] Bluetooth: btrtl: Add btrealtek data struct Date: Tue, 13 Sep 2022 18:02:42 +0800 Message-ID: <20220913100244.23660-2-hildawu@realtek.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220913100244.23660-1-hildawu@realtek.com> References: <20220913100244.23660-1-hildawu@realtek.com> MIME-Version: 1.0 X-Originating-IP: [172.21.132.192] X-ClientProxiedBy: RTEXH36505.realtek.com.tw (172.21.6.25) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: trusted connection X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 09/13/2022 08:01:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: =?big5_tw?b?Q2xlYW4sIGJhc2VzOiAyMDIyLzkvMTMgpFekyCAwNzoz?= =?big5_tw?b?MzowMA==?= X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-ServerInfo: RTEXH36505.realtek.com.tw, 9 X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Hilda Wu This patch adds a data structure for btrealtek object, and the definition of vendor behavior flags. It also adds macros to set/test/get the flags. Signed-off-by: Hilda Wu --- Changes in v2: - Set the proper priv_size to hci_alloc_dev_priv(). - Separate commits for functions. --- --- drivers/bluetooth/btrtl.h | 22 ++++++++++++++++++++++ drivers/bluetooth/btusb.c | 3 +++ 2 files changed, 25 insertions(+) diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h index 2c441bda390a..e2c99684799a 100644 --- a/drivers/bluetooth/btrtl.h +++ b/drivers/bluetooth/btrtl.h @@ -47,6 +47,28 @@ struct rtl_vendor_config { struct rtl_vendor_config_entry entry[]; } __packed; +enum { + REALTEK_WBS_FILTER, + 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, diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index c3daba17de7f..4c3aed89ff05 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -3749,6 +3749,9 @@ 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; From patchwork Tue Sep 13 10:02:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hilda Wu X-Patchwork-Id: 605900 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 219E8C54EE9 for ; Tue, 13 Sep 2022 10:03:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231425AbiIMKDj (ORCPT ); Tue, 13 Sep 2022 06:03:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231447AbiIMKDW (ORCPT ); Tue, 13 Sep 2022 06:03:22 -0400 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 457535E642; Tue, 13 Sep 2022 03:03:15 -0700 (PDT) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 28DA2UUB0014153, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36504.realtek.com.tw[172.21.6.27]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 28DA2UUB0014153 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 13 Sep 2022 18:02:30 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36504.realtek.com.tw (172.21.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Tue, 13 Sep 2022 18:02:51 +0800 Received: from localhost.localdomain (172.21.132.192) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Tue, 13 Sep 2022 18:02:50 +0800 From: To: CC: , , , , , , , , Subject: [PATCH v2 2/3] Bluetooth: btusb: Workaround for spotty SCO quality Date: Tue, 13 Sep 2022 18:02:43 +0800 Message-ID: <20220913100244.23660-3-hildawu@realtek.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220913100244.23660-1-hildawu@realtek.com> References: <20220913100244.23660-1-hildawu@realtek.com> MIME-Version: 1.0 X-Originating-IP: [172.21.132.192] X-ClientProxiedBy: RTEXH36505.realtek.com.tw (172.21.6.25) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: trusted connection X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 09/13/2022 08:01:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: =?big5_tw?b?Q2xlYW4sIGJhc2VzOiAyMDIyLzkvMTMgpFekyCAwNzoz?= =?big5_tw?b?MzowMA==?= X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-ServerInfo: RTEXH36504.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: fallback X-KSE-Antivirus-Interceptor-Info: fallback X-KSE-AntiSpam-Interceptor-Info: fallback Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Hilda Wu When streaming HFP, once a few minutes a brief pause in audio can be heard on some platform with Realtek Bluetooth. When the issue occurs, the system will see the SCO packet for unknown connection handle messages. Note: This issue affects (e)SCO only, does not affect ACLs. Because the duplicate packet causing the problem only occurs in Realtek BT. This is to filter out duplicate packet for avoiding influence. Signed-off-by: Hilda Wu --- Changes in v2: - Seperate commits for functions --- --- drivers/bluetooth/btrtl.c | 28 ++++++++++++++++++++++++++++ drivers/bluetooth/btrtl.h | 8 ++++++++ drivers/bluetooth/btusb.c | 14 ++++++++++++++ 3 files changed, 50 insertions(+) diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c index fb52313a1d45..15223b3ed94d 100644 --- a/drivers/bluetooth/btrtl.c +++ b/drivers/bluetooth/btrtl.c @@ -781,6 +781,7 @@ 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); + btrealtek_set_flag(hdev, REALTEK_WBS_FILTER); hci_set_aosp_capable(hdev); break; default: @@ -937,6 +938,33 @@ int btrtl_get_uart_settings(struct hci_dev *hdev, } EXPORT_SYMBOL_GPL(btrtl_get_uart_settings); +int btrtl_usb_recv_isoc(u16 pos, u8 *data, u8 *p, int len, + u16 wMaxPacketSize) +{ + u8 *prev; + + if (pos >= HCI_SCO_HDR_SIZE && pos >= wMaxPacketSize && + len == wMaxPacketSize && !(pos % wMaxPacketSize) && + wMaxPacketSize >= 10 && p[0] == data[0] && p[1] == data[1]) { + prev = data + (pos - wMaxPacketSize); + + /* Detect the sco data of usb isoc pkt duplication. */ + if (!memcmp(p + 2, prev + 2, 8)) + return -EILSEQ; + + if (wMaxPacketSize >= 12 && + p[2] == prev[6] && p[3] == prev[7] && + p[4] == prev[4] && p[5] == prev[5] && + p[6] == prev[10] && p[7] == prev[11] && + p[8] == prev[8] && p[9] == prev[9]) { + return -EILSEQ; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(btrtl_usb_recv_isoc); + MODULE_AUTHOR("Daniel Drake "); MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION); MODULE_VERSION(VERSION); diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h index e2c99684799a..79e93a8b229f 100644 --- a/drivers/bluetooth/btrtl.h +++ b/drivers/bluetooth/btrtl.h @@ -84,6 +84,8 @@ int btrtl_get_uart_settings(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev, unsigned int *controller_baudrate, u32 *device_baudrate, bool *flow_control); +int btrtl_usb_recv_isoc(u16 pos, u8 *data, u8 *buffer, int len, + u16 wMaxPacketSize); #else @@ -127,4 +129,10 @@ static inline int btrtl_get_uart_settings(struct hci_dev *hdev, return -ENOENT; } +static inline int btrtl_usb_recv_isoc(u16 pos, u8 *data, u8 *buffer, int len, + u16 wMaxPacketSize) +{ + return -EOPNOTSUPP; +} + #endif diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 4c3aed89ff05..8e595e03655a 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -961,6 +961,7 @@ static int btusb_recv_isoc(struct btusb_data *data, void *buffer, int count) struct sk_buff *skb; unsigned long flags; int err = 0; + u16 wMaxPacketSize = le16_to_cpu(data->isoc_rx_ep->wMaxPacketSize); spin_lock_irqsave(&data->rxlock, flags); skb = data->sco_skb; @@ -980,6 +981,19 @@ static int btusb_recv_isoc(struct btusb_data *data, void *buffer, int count) } len = min_t(uint, hci_skb_expect(skb), count); + + /* Gaps in audio could be heard while streaming WBS using USB + * alt settings 3 on some platforms, since this is only used + * with RTK chips so let vendor function detect it. + */ + if (test_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags) && + btrealtek_test_flag(data->hdev, REALTEK_WBS_FILTER)) { + err = btrtl_usb_recv_isoc(skb->len, skb->data, buffer, + len, wMaxPacketSize); + if (err) + break; + } + skb_put_data(skb, buffer, len); count -= len; From patchwork Tue Sep 13 10:02:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hilda Wu X-Patchwork-Id: 605901 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61019C6FA82 for ; Tue, 13 Sep 2022 10:03:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231271AbiIMKDK (ORCPT ); Tue, 13 Sep 2022 06:03:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230138AbiIMKDH (ORCPT ); Tue, 13 Sep 2022 06:03:07 -0400 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5A7E936DF9; Tue, 13 Sep 2022 03:03:04 -0700 (PDT) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 28DA2VGM0014166, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36505.realtek.com.tw[172.21.6.25]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 28DA2VGM0014166 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 13 Sep 2022 18:02:31 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36505.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 13 Sep 2022 18:02:51 +0800 Received: from localhost.localdomain (172.21.132.192) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Tue, 13 Sep 2022 18:02:50 +0800 From: To: CC: , , , , , , , , Subject: [PATCH v2 3/3] Bluetooth: btsub: Ignore zero length of USB packets on ALT 6 for the specific chip model of Realtek devices Date: Tue, 13 Sep 2022 18:02:44 +0800 Message-ID: <20220913100244.23660-4-hildawu@realtek.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220913100244.23660-1-hildawu@realtek.com> References: <20220913100244.23660-1-hildawu@realtek.com> MIME-Version: 1.0 X-Originating-IP: [172.21.132.192] X-ClientProxiedBy: RTEXH36505.realtek.com.tw (172.21.6.25) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: trusted connection X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 09/13/2022 08:01:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: =?big5_tw?b?Q2xlYW4sIGJhc2VzOiAyMDIyLzkvMTMgpFekyCAwNzoz?= =?big5_tw?b?MzowMA==?= X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-ServerInfo: RTEXH36505.realtek.com.tw, 9 X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Hilda Wu For USB ALT 6 settings some Realtek chips need to transmit mSBC data continuously without the zero length of USB packets. In this commit, create BTUSB_ALT6_CONTINUOUS_TX to manage the workaround. Therefore, create REALTEK_ALT6_CONTINUOUS_TX_CHIP to manage the specific chip model for the workaround. Signed-off-by: Max Chou Signed-off-by: Hilda Wu --- drivers/bluetooth/btrtl.c | 7 +++++++ drivers/bluetooth/btusb.c | 14 +++++++++++++- 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c index 15223b3ed94d..6d74175cd25f 100644 --- a/drivers/bluetooth/btrtl.c +++ b/drivers/bluetooth/btrtl.c @@ -782,6 +782,13 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev) set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks); set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks); btrealtek_set_flag(hdev, REALTEK_WBS_FILTER); + + /* 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: diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 8e595e03655a..50a21061350e 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -626,6 +626,7 @@ 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; @@ -1284,11 +1285,18 @@ 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 Realtek chips need to transmit the data + * continuously without the zero length of USB packets. + */ + if (test_bit(BTUSB_ALT6_CONTINUOUS_TX, &data->flags)) + if (btrealtek_test_flag(data->hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP)) + 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. @@ -1308,6 +1316,7 @@ 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; @@ -3931,6 +3940,9 @@ static int btusb_probe(struct usb_interface *intf, /* Realtek devices need to set remote wakeup on auto-suspend */ set_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags); set_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags); + + /* Some Realtek devices need to transmit mSBC data continuously */ + set_bit(BTUSB_ALT6_CONTINUOUS_TX, &data->flags); } if (!reset)