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authorHilda Wu <hildawu@realtek.com>2021-05-14 11:19:01 +0800
committerMarcel Holtmann <marcel@holtmann.org>2021-06-26 07:12:33 +0200
commite848dbd364aca44c9d23c04bef964fab79e2b34f (patch)
treea2fa49f81fad8d297de9935305efb7109082f7d0 /drivers/bluetooth
parentde895b43932cb47e69480540be7eca289af24f23 (diff)
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>
Diffstat (limited to 'drivers/bluetooth')
-rw-r--r--drivers/bluetooth/btusb.c7
1 files changed, 7 insertions, 0 deletions
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)