linux-kernel - Re: [PATCH RESEND 2/2] Bluetooth: fix use-bdaddr-property quirk

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Message-ID: <ecef83c8-497f-4011-607b-a63c24764867@samsung.com>
Date:   Fri, 2 Jun 2023 00:01:55 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 2/2] Bluetooth: fix use-bdaddr-property quirk

On 31.05.2023 11:04, Johan Hovold wrote:
> Devices that lack persistent storage for the device address can indicate
> this by setting the HCI_QUIRK_INVALID_BDADDR which causes the controller
> to be marked as unconfigured until user space has set a valid address.
>
> The related HCI_QUIRK_USE_BDADDR_PROPERTY was later added to similarly
> indicate that the device lacks a valid address but that one may be
> specified in the devicetree.
>
> As is clear from commit 7a0e5b15ca45 ("Bluetooth: Add quirk for reading
> BD_ADDR from fwnode property") that added and documented this quirk and
> commits like de79a9df1692 ("Bluetooth: btqcomsmd: use
> HCI_QUIRK_USE_BDADDR_PROPERTY"), the device address of controllers with
> this flag should be treated as invalid until user space has had a chance
> to configure the controller in case the devicetree property is missing.
>
> As it does not make sense to allow controllers with invalid addresses,
> restore the original semantics, which also makes sure that the
> implementation is consistent (e.g. get_missing_options() indicates that
> the address must be set) and matches the documentation (including
> comments in the code, such as, "In case any of them is set, the
> controller has to start up as unconfigured.").
>
> Fixes: e668eb1e1578 ("Bluetooth: hci_core: Don't stop BT if the BD address missing in dts")
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

This patch has been recently merged to linux-next as commit 6ac517d8cf8b 
("Bluetooth: fix use-bdaddr-property quirk"). Unfortunately it breaks 
bluetooth operation on my Raspberry Pi 3b+, 4b+ and Khadas VIM3 based 
test systems.

Before this patch on Raspberry Pi 4b+:

root@...get:~# dmesg | grep hci0
[   14.459292] Bluetooth: hci0: BCM: chip id 107
[   14.464283] Bluetooth: hci0: BCM: features 0x2f
[   14.470632] Bluetooth: hci0: BCM4345C0
[   14.474483] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0000
[   14.487275] Bluetooth: hci0: BCM4345C0 'brcm/BCM4345C0.hcd' Patch
[   15.347542] Bluetooth: hci0: BCM: features 0x2f
[   15.354588] Bluetooth: hci0: BCM43455 37.4MHz Raspberry Pi 3+-0159
[   15.361076] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0290
root@...get:~# hcitool dev
Devices:
         hci0    DC:A6:32:12:38:D1
root@...get:~#
root@...get:~# hcitool scan
Scanning ...
         88:57:1D:AB:19:B2    Samsung Family Hub
root@...get:~# hcitool | head -n1
hcitool - HCI Tool ver 5.50
root@...get:~#


After this patch:

root@...get:~# dmesg | grep hci0
[   13.979860] Bluetooth: hci0: BCM: chip id 107
[   13.984969] Bluetooth: hci0: BCM: features 0x2f
[   13.991444] Bluetooth: hci0: BCM4345C0
[   13.995300] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0000
[   14.005131] Bluetooth: hci0: BCM4345C0 'brcm/BCM4345C0.hcd' Patch
[   14.839465] Bluetooth: hci0: BCM: features 0x2f
[   14.846047] Bluetooth: hci0: BCM43455 37.4MHz Raspberry Pi 3+-0159
[   14.859859] Bluetooth: hci0: BCM4345C0 (003.001.025) build 0290
root@...get:~# hcitool dev
Devices:
root@...get:~# hcitool scan
Device is not available: No such device
root@...get:~# hcitool | head -n1
hcitool - HCI Tool ver 5.50
root@...get:~#

Reverting $subject on top of linux-next fixes this 'issue'.

Let me know if you need more information about my test systems or to 
make some other tests.

 > ...

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland