Bluetooth: btusb: Dynamic alternate setting
The alternate setting must be dynamically set according to the number of
active SCO links, and the bit depth of the audio. The possible values
for the alternate setting are described in the Bluetooth Core
Specification, Volume 4, Part B, section 2.1.1.
Signed-off-by: Mikel Astiz <mikel.astiz.oss@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo@padovan.org>
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 9217121..de17121 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -855,6 +855,7 @@
{
struct btusb_data *data = container_of(work, struct btusb_data, work);
struct hci_dev *hdev = data->hdev;
+ int new_alts;
int err;
if (hdev->conn_hash.sco_num > 0) {
@@ -868,11 +869,19 @@
set_bit(BTUSB_DID_ISO_RESUME, &data->flags);
}
- if (data->isoc_altsetting != 2) {
+
+ if (hdev->voice_setting & 0x0020) {
+ static const int alts[3] = { 2, 4, 5 };
+ new_alts = alts[hdev->conn_hash.sco_num - 1];
+ } else {
+ new_alts = hdev->conn_hash.sco_num;
+ }
+
+ if (data->isoc_altsetting != new_alts) {
clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
usb_kill_anchored_urbs(&data->isoc_anchor);
- if (__set_isoc_interface(hdev, 2) < 0)
+ if (__set_isoc_interface(hdev, new_alts) < 0)
return;
}