[PATCH v2] Bluetooth: btusb: Add support USB ALT 3 for WBS
From: <hidden>
Date: 2021-05-14 03:19:19
Also in:
lkml
Subsystem:
bluetooth drivers, the rest · Maintainers:
Marcel Holtmann, Luiz Augusto von Dentz, Linus Torvalds
From: Hilda Wu <redacted> 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 <redacted> --- Changes in v2: - Updated signed off name. - Adjusted coding style. --- --- drivers/bluetooth/btusb.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 6f253378e893..1e98f985740b 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