Re: [PATCH v4] Bluetooth: Fix Bluetooth for BCM4377 on T2 Intel MacBooks

[Johan Hovold <johan@kernel.org>]

On Mon, Dec 25, 2023 at 03:21:04PM -0500, Felix Zhang wrote:
> Starting v6.5, Bluetooth does not work at all on my T2
> MacBookAir9,1 with the BCM4377 chip.  When I boot up the computer,
> go into bluetoothctl, and then try to run commands like scan on,
> show, list, it returns "No default controller available."  I have
> tried reloading the kernel module, in which the log outputs
> "{Added,Removed} hci0 (unconfigured)."  With this patch, I
> am able to use Bluetooth as normal without any errors regarding
> hci0 being unconfigured.  However, an issue is still present
> where sometimes hci_bcm4377 will have to be reloaded in order to
> get bluetooth to work.  I believe this was still present before
> the previously mentioned commit.
> 
> I would also like to thank Kerem Karabay <kekrby@gmail.com> for
> assisting me with this patch.
> 
> Fixes: 6945795bc81a ("Bluetooth: fix use-bdaddr-property quirk")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Felix Zhang <mrman@mrman314.tech>
> ---
> v4:
> * Adjust the format to pass the CI (again).
> * Shorten description

As explained here:

	https://lore.kernel.org/all/ZYv8tp3fMiAqK8OI@hovoldconsulting.com/

I don't this is necessarily the right fix. The BD_ADDR quirk property
should not be set unconditionally but it is still needed for devices
that lack storage for a unique device address.

So the following fix is needed either way and is probably all that is
needed here:

	https://lore.kernel.org/lkml/20231227101003.10534-1-johan+linaro@kernel.org/

Johan