On Wed, Mar 20, 2024 at 08:55:52AM +0100, Johan Hovold wrote:
> Several Qualcomm 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 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.
>
> The boot firmware in SC7180 Trogdor Chromebooks is known to be affected
> so mark the 'local-bd-address' property as broken to maintain backwards
> compatibility with older firmware when fixing the underlying driver bug.
>
> Note that ChromeOS always updates the kernel and devicetree in lockstep
> so that there is no need to handle backwards compatibility with older
> devicetrees.
>
> Fixes: 7ec3e67307f8 ("arm64: dts: qcom: sc7180-trogdor: add initial trogdor and lazor dt")
> Cc: stable@xxxxxxxxxxxxxxx # 5.10
> Cc: Rob Clark <robdclark@xxxxxxxxxxxx>
> Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Acked-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Please merge this through the BT tree, together with the other patches.
Regards,
Bjorn
> ---
> arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> index 46aaeba28604..ebe37678102f 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> @@ -943,6 +943,8 @@ bluetooth: bluetooth {
> vddrf-supply = <&pp1300_l2c>;
> vddch0-supply = <&pp3300_l10c>;
> max-speed = <3200000>;
> +
> + qcom,local-bd-address-broken;
> };
> };
>
> --
> 2.43.2
>
