From e848dbd364aca44c9d23c04bef964fab79e2b34f Mon Sep 17 00:00:00 2001
From: Hilda Wu <hildawu@realtek.com>
Date: Fri, 14 May 2021 11:19:01 +0800
Subject: [PATCH] Bluetooth: btusb: Add support USB ALT 3 for WBS
Git-commit: e848dbd364aca44c9d23c04bef964fab79e2b34f
Patch-mainline: v5.14-rc1
References: git-fixes
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: Hilda Wu <hildawu@realtek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/bluetooth/btusb.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index ff41fb0fb557..f7131059469e 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1756,6 +1756,13 @@ 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)
--
2.26.2