Date:   Tue, 28 Dec 2021 05:53:59 +0000
To:     Aditya Garg <gargaditya08@live.com>
From:   Orlando Chamberlain <redecorating@protonmail.com>
Cc:     Marcel Holtmann <marcel@holtmann.org>,
        Johan Hedberg <johan.hedberg@intel.com>,
        "johan.hedberg@gmail.com" <johan.hedberg@gmail.com>,
        Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "admin@kodeit.net" <admin@kodeit.net>
Reply-To: Orlando Chamberlain <redecorating@protonmail.com>
Subject: Re: [BUG] Slow bluetooth speed on Apple MacBook Pro 16,1
Message-ID: <20211228055353.1b4c09e9@localhost>
In-Reply-To: <3352A23E-EA42-4366-BBAA-459CEAE6F51B@live.com>
References: <3352A23E-EA42-4366-BBAA-459CEAE6F51B@live.com>
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On Tue, 28 Dec 2021 14:24:09 +1100
"Aditya Garg" <gargaditya08@live.com> wrote:

> The file transfer speed on MacBook Pro 16,1 from an Android device to
> Mac is too slow even if I transfer a file of a few Kbs. In case of a
> transfer from Mac to my Android device, it simply fails.
>=20
> Some logs that might be helpful :-
>=20
> -- Logs begin at Fri 2021-11-26 21:34:04 IST, end at Tue 2021-12-28 08:38=
:16 IST. --
> Dec 28 08:28:29 MacBook kernel: Bluetooth: Core ver 2.22
> Dec 28 08:28:29 MacBook kernel: NET: Registered PF_BLUETOOTH protocol fam=
ily
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI device and connection mana=
ger initialized
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI socket layer initialized
> Dec 28 08:28:29 MacBook kernel: Bluetooth: L2CAP socket layer initialized
> Dec 28 08:28:29 MacBook kernel: Bluetooth: SCO socket layer initialized
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART driver ver 2.3
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol H4 registere=
d
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol BCSP registe=
red
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol LL registere=
d
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol ATH3K regist=
ered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol Three-wire (=
H5) registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol Intel regist=
ered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol Broadcom reg=
istered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol QCA register=
ed
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol AG6XX regist=
ered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol Marvell regi=
stered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM: failed to write upd=
ate baudrate (-16)
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: Failed to set baudrate

When it fails to set baud rate, btmon has the following:

< HCI Command: Broadcom Update UART Baud Rate (0x3f|0x0018) plen 6=20
        Encoded baud rate: Not used (0x0000)
        Explicit baud rate: 3000000 Mbps
> HCI Event: Command Complete (0x0e) plen 4                       =20
      Broadcom Update UART Baud Rate (0x3f|0x0018) ncmd 1
        Status: Command Disallowed (0x0c)

Not sure if this means the command is unsupported by this chip, or if an "E=
ncoded
baud rate" needs to be specified.

> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM: chip id 150
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM: features 0x07
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM4364B3 Trinidad Olymp=
ic GEN (MFG)
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM (001.016.075) build =
0099
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM: firmware Patch file=
 not found, tried:
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM: 'brcm/BCM.hcd'
> Dec 28 08:28:40 MacBook kernel: Bluetooth: BNEP (Ethernet Emulation) ver =
1.3
> Dec 28 08:28:40 MacBook kernel: Bluetooth: BNEP filters: protocol multica=
st
> Dec 28 08:28:40 MacBook kernel: Bluetooth: BNEP socket layer initialized
> Dec 28 08:35:02 MacBook kernel: Bluetooth: RFCOMM TTY layer initialized
> Dec 28 08:35:02 MacBook kernel: Bluetooth: RFCOMM socket layer initialize=
d
> Dec 28 08:35:02 MacBook kernel: Bluetooth: RFCOMM ver 1.11