mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-16 13:41:48 -04:00
Code Issues Packages Projects Releases Wiki Activity

Bluetooth: btmtk: fix ISO interface setup for single alt setting

Browse Source 
Some MT6639 Bluetooth USB interfaces (e.g. IMC Networks 13d3:3588 on
ASUS ROG STRIX X870E-E and ProArt X870E-Creator boards) expose only a
single alternate setting (alt 0) on the ISO interface. The driver
unconditionally requests alt setting 1, which fails with EINVAL on
these devices, causing a ~20 second initialization delay and no LE
audio support.

Check the number of available alternate settings before selecting one.
If only alt 0 exists, use it; otherwise request alt 1 as before.

Closes: https://github.com/jetm/mediatek-mt7927-dkms/pull/39
Signed-off-by: Javier Tia <floss@jetm.me>
Reported-by: Ryan Gilbert <xelnaga@gmail.com>
Tested-by: Ryan Gilbert <xelnaga@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Javier Tia
2026-03-30 14:39:24 -06:00
committed by Luiz Augusto von Dentz
parent 28b7c5a6db
commit e4f6bc7f82
1 changed files with 2 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/bluetooth/btmtk.c
View File

@@ -1029,7 +1029,8 @@ static int __set_mtk_intr_interface(struct hci_dev *hdev)
if (!btmtk_data->isopkt_intf)
return -ENODEV;
err = usb_set_interface(btmtk_data->udev, MTK_ISO_IFNUM, 1);
err = usb_set_interface(btmtk_data->udev, MTK_ISO_IFNUM,
(intf->num_altsetting > 1) ? 1 : 0);
if (err < 0) {
bt_dev_err(hdev, "setting interface failed (%d)", -err);
return err;