linux-kernel - Re: [PATCH v2 1/4] dt-bindings: bluetooth: add new wcn3991 compatible to fix bd

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Date: Mon, 18 Mar 2024 17:34:50 +0100
From: Johan Hovold <johan@...nel.org>
To: Doug Anderson <dianders@...gle.com>, Rob Herring <robh@...nel.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Matthias Kaehlcke <mka@...omium.org>,
	Bjorn Andersson <quic_bjorande@...cinc.com>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	linux-bluetooth@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: bluetooth: add new wcn3991
 compatible to fix bd_addr

On Mon, Mar 18, 2024 at 08:58:40AM -0700, Doug Anderson wrote:
> On Mon, Mar 18, 2024 at 8:47 AM Johan Hovold <johan@...nel.org> wrote:
> > On Mon, Mar 18, 2024 at 08:31:09AM -0700, Doug Anderson wrote:

> > Thanks for the details. Sounds like we could get away with adding a new
> > property for the broken firmware in this case, which should resolve this
> > nicely without having to deprecate anything.
> >
> > Could you carry such a devicetree patch out-of-tree until the firmware
> > has been fixed?
> 
> IMO we shouldn't try to fix the firmware at all. Given the fact that
> it took me a year to get a firmware uprev completed for one trogdor
> variant for fixes that actually had functional impact, it's possible
> we'll never actually get an uprev completed that includes this fix or
> it will happen years from now when nobody remembers about it. I'm also
> certain this whole issue will also cause a bunch of debugging over the
> years if we try to fix it in firmware like that. There are cases where
> people end up running with old firmware since the developer workflow
> doesn't automatically update it.
> 
> The handling should be added upstream and we should just accept that
> the trogdor firmware gets it backward.

Fair enough.

Rob, are you OK with adding a 'qcom,local-bd-address-broken' or
similarly named property to indicate that the boot firmware passes the
address in the wrong order?

I'd then add that property to sc7180-trogdor.dtsi in mainline.

Johan