New: MacBookPro13,1 (2016) Bluetooth not working

https://bugzilla.kernel.org/show_bug.cgi?id=205115

            Bug ID: 205115
           Summary: MacBookPro13,1 (2016) Bluetooth not working
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.3.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Bluetooth
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Since https://bugzilla.kernel.org/show_bug.cgi?id=110901 was closed, I would like to open a new bug to track the remaining issue on MacBookPro models without touchbar, where bluetooth fails to initialise without an additional patch.

$ dmesg | grep Bluetooth
[    9.416324] Bluetooth: Core ver 2.22
[    9.416343] Bluetooth: HCI device and connection manager initialized
[    9.416348] Bluetooth: HCI socket layer initialized
[    9.416350] Bluetooth: L2CAP socket layer initialized
[    9.416355] Bluetooth: SCO socket layer initialized
[    9.721375] Bluetooth: HCI UART driver ver 2.3
[    9.721377] Bluetooth: HCI UART protocol H4 registered
[    9.721377] Bluetooth: HCI UART protocol BCSP registered
[    9.721390] Bluetooth: HCI UART protocol LL registered
[    9.721390] Bluetooth: HCI UART protocol ATH3K registered
[    9.721400] Bluetooth: HCI UART protocol Three-wire (H5) registered
[    9.721433] Bluetooth: HCI UART protocol Intel registered
[    9.749504] Bluetooth: HCI UART protocol Broadcom registered
[    9.749517] Bluetooth: HCI UART protocol QCA registered
[    9.749518] Bluetooth: HCI UART protocol AG6XX registered
[    9.749526] Bluetooth: HCI UART protocol Marvell registered
[   11.995669] Bluetooth: hci0: command 0xfc18 tx timeout
[   12.663134] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   12.663136] Bluetooth: BNEP filters: protocol multicast
[   12.663140] Bluetooth: BNEP socket layer initialized
[   19.892179] Bluetooth: hci0: BCM: failed to write update baudrate (-110)
[   19.892196] Bluetooth: hci0: Failed to set baudrate
[   22.022193] Bluetooth: hci0: command 0x0c03 tx timeout
[   29.915576] Bluetooth: hci0: BCM: Reset failed (-110)

The issue has been previously discussed at:
https://github.com/Dunedan/mbp-2016-linux/issues/29

Current workarounds are either:
https://github.com/lategoodbye/rpi-zero/commit/ed5900296dfb
or:
https://github.com/christophgysin/linux/commit/ddf622a0a19697af473051c8019fffc1eb66efe7

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