linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sc8280xp-crd: add wifi calibration variant

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Message-ID: <ZBg7tA8NLDnjPp+k@hovoldconsulting.com>
Date:   Mon, 20 Mar 2023 11:55:48 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Kalle Valo <kvalo@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sc8280xp-crd: add wifi calibration
 variant

On Mon, Mar 20, 2023 at 11:50:30AM +0100, Konrad Dybcio wrote:
> 
> 
> On 20.03.2023 11:46, Johan Hovold wrote:
> > Describe the bus topology for PCIe domain 6 and add the ath11k
> > calibration variant so that the board file (calibration data) can be
> > loaded.
> > 
> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=216036
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts | 17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> > index 90a5df9c7a24..5dfda12f669b 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> 
> 
> Was mixing
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> 
> this /\
> 
> [...]
> 
> and this \/
> > +			qcom,ath11k-calibration-variant = "LE_X13S";
> Intentional? Especially given Kalle's comment on bugzilla?

Yes, it is intentional. The corresponding calibration data allows the
wifi to be used on the CRD. I measure 150 MBits/s which may a bit lower
than expected, but it's better than having no wifi at all.

Johan