linux-kernel - [PATCH] Bluetooth: btusb: Add support USB ALT 3 for WBS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210513101806.5666-1-hildawu@realtek.com>
Date:   Thu, 13 May 2021 18:18:06 +0800
From:   <hildawu@...ltek.com>
To:     <marcel@...tmann.org>
CC:     <johan.hedberg@...il.com>, <luiz.dentz@...il.com>,
        <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <max.chou@...ltek.com>, <alex_lu@...lsil.com.cn>,
        <kidman@...ltek.com>
Subject: [PATCH] Bluetooth: btusb: Add support USB ALT 3 for WBS

From: hildawu <hildawu@...ltek.com>

Because mSBC frames do not need to be aligned to the SCO packet
boundary. Using USB ALT 3 let HCI payload >= 60 bytes, let mSBC
data satisfy 60 Bytes avoid payload unaligned situation and fixed
some headset no voise issue.

USB Alt 3 supported also need HFP support transparent MTU in 72 Bytes.

Signed-off-by: hildawu <hildawu@...ltek.com>
---
 drivers/bluetooth/btusb.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 6f253378e893..872034e7a232 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1752,6 +1752,13 @@ static void btusb_work(struct work_struct *work)
 			 * which work with WBS at all.
 			 */
 			new_alts = btusb_find_altsetting(data, 6) ? 6 : 1;
+			/* Because mSBC frames do not need to be aligned to the
+			 * SCO packet boundary. If support the Alt 3, use the
+			 * Alt 3 for HCI payload >= 60 Bytes let air packet
+			 * data satisfy 60 bytes.
+			 */
+			if ((new_alts == 1) && (btusb_find_altsetting(data, 3)))
+				new_alts = 3;
 		}
 
 		if (btusb_switch_alt_setting(hdev, new_alts) < 0)
-- 
2.17.1