| Message ID | 20240320075554.8178-3-johan+linaro@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Bluetooth: qca: fix device-address endianness | expand |
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@vger.kernel.org # 5.10 > Cc: Rob Clark <robdclark@chromium.org> > Reviewed-by: Douglas Anderson <dianders@chromium.org> > Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Acked-by: Bjorn Andersson <andersson@kernel.org> Reviewed-by: Bjorn Andersson <andersson@kernel.org> 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 >
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; }; };
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@vger.kernel.org # 5.10 Cc: Rob Clark <robdclark@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> --- arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 2 ++ 1 file changed, 2 insertions(+)