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Bluetooth: btusb: Add support USB ALT 3 for WBS 

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>
This commit is contained in:
Hilda Wu 2021-05-14 11:19:01 +08:00 committed by Marcel Holtmann
parent de895b4393
commit e848dbd364
1 changed files with 7 additions and 0 deletions
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7
drivers/bluetooth/btusb.c
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@ -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)