[Bug 217475] Foxconn / Hon Hai Bluetooth adapter 0489:e0cd stops working on ThinkPad T14s AMD Gen1

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217475

--- Comment #5 from Alberto Garcia (berto@igalia.com) ---
Hi, I'm on Linux 6.12.73 now.

I found that btusb.enable_autosuspend=n seems to solve the problem.

Commit 67dba2c28fe0 ("btmtk: Fix failed to send func ctrl for MediaTek
devices.") prevents the device from suspending during btmtk_usb_shutdown() to
avoid timeout errors similar to the ones I'm experiencing:

   btmtk_usb_hci_wmt_sync() hci0: Execution of wmt command timed out
   btmtk_usb_shutdown() hci0: Failed to send wmt func ctrl (-110)

So I wonder if the same thing is happening during btmtk_usb_setup().

There's a long gap until the bluetooth driver is loaded. This computer has an
external USB-C dock that sometimes takes a long time to initialize, also the
hard drive is encrypted with LUKS so the btusb driver (and its firmware) cannot
be loaded until I enter the password and the rootfs is decrypted. All this can
take easily 20 seconds.

So maybe the bluetooth adapter suspends before the driver is loaded and that's
why the initialization fails, does that make sense?

I tried patching btmtk_usb_setup() with the same approach and so far I haven't
been able to reproduce the issue anymore.

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