linux-kernel - Re: [BUG] Slow bluetooth speed on Apple MacBook Pro 16,1

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Message-ID: <20211228055353.1b4c09e9@localhost>
Date:   Tue, 28 Dec 2021 05:53:59 +0000
From:   Orlando Chamberlain <redecorating@...tonmail.com>
To:     Aditya Garg <gargaditya08@...e.com>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...el.com>,
        "johan.hedberg@...il.com" <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "admin@...eit.net" <admin@...eit.net>
Subject: Re: [BUG] Slow bluetooth speed on Apple MacBook Pro 16,1

On Tue, 28 Dec 2021 14:24:09 +1100
"Aditya Garg" <gargaditya08@...e.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.
> 
> Some logs that might be helpful :-
> 
> -- 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 family
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI device and connection manager 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 registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol BCSP registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol LL registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol ATH3K registered
> 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 registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol Broadcom registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol QCA registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol AG6XX registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: HCI UART protocol Marvell registered
> Dec 28 08:28:29 MacBook kernel: Bluetooth: hci0: BCM: failed to write update 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 
        Encoded baud rate: Not used (0x0000)
        Explicit baud rate: 3000000 Mbps
> HCI Event: Command Complete (0x0e) plen 4                        
      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 "Encoded
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 Olympic 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 multicast
> 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 initialized
> Dec 28 08:35:02 MacBook kernel: Bluetooth: RFCOMM ver 1.11