Re: [PATCH v3 2/5] Bluetooth: add quirk for broken address properties

[Doug Anderson]

Hi,

On Tue, Mar 19, 2024 at 8:29 AM Johan Hovold <johan+linaro@xxxxxxxxxx> wrote:
>
> Some Bluetooth controllers lack persistent storage for the device
> address and instead one can be provided by the boot firmware using the
> 'local-bd-address' devicetree property.
>
> The Bluetooth devicetree bindings clearly states that the address should
> be specified in little-endian order, but due to a long-standing bug in
> the Qualcomm driver which reversed the address some boot firmware has
> been providing the address in big-endian order instead.
>
> Add a new quirk that can be set on platforms with broken firmware and
> use it to reverse the address when parsing the property so that the
> underlying driver bug can be fixed.
>
> Fixes: 5c0a1001c8be ("Bluetooth: hci_qca: Add helper to set device address")
> Cc: stable@xxxxxxxxxxxxxxx      # 5.1
> Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
> ---
>  include/net/bluetooth/hci.h | 9 +++++++++
>  net/bluetooth/hci_sync.c    | 5 ++++-
>  2 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
> index bdee5d649cc6..191077d8d578 100644
> --- a/include/net/bluetooth/hci.h
> +++ b/include/net/bluetooth/hci.h
> @@ -176,6 +176,15 @@ enum {
>          */
>         HCI_QUIRK_USE_BDADDR_PROPERTY,
>
> +       /* When this quirk is set, the Bluetooth Device Address provided by
> +        * the 'local-bd-address' fwnode property is incorrectly specified in
> +        * big-endian order.
> +        *
> +        * This quirk can be set before hci_register_dev is called or
> +        * during the hdev->setup vendor callback.
> +        */
> +       HCI_QUIRK_BDADDR_PROPERTY_BROKEN,

Like with the binding, I feel like
"HCI_QUIRK_BDADDR_PROPERTY_BACKWARDS" or
"HCI_QUIRK_BDADDR_PROPERTY_SWAPPED" would be more documenting but I
don't feel strongly.

Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>