[SRU] [OEM-5.14] [PATCH 0/1] Fix non-working MT7921 BT after reboot

Kai-Heng Feng kai.heng.feng at canonical.com
Fri Mar 25 15:53:46 UTC 2022


BugLink: https://bugs.launchpad.net/bugs/1966497

[Impact]
There's a high chance that MT7921 BT may go out to lunch after reboot.
Worse, there's no way to recover the controller unless the power cord is
unplugged.

[Fix]
In addition to SRU "Need to reset MT7921 BT when the firmware hang or
command no response", enable MSFT extension can magically solve the
issue.

[Test]
With the patch applied, the MT7921 BT continues to work after 100 times
reboots.

[Where problems could occur]
This fix is specific to MTK BT controllers, so the change is limited.

I totally don't understand why this patch can fix the issue, other than
it just does the trick. So I guess we have to accept the reality that
hardwares can have their own quirks.

mark-yw.chen (1):
  Bluetooth: btusb: Enable MSFT extension for Mediatek Chip (MT7921)

 drivers/bluetooth/btusb.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.34.1




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