linux-kernel - Re: [PATCH 9/9] arm64: dts: qcom: qcm6490-fairphone-fp5: Enable WiFi

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Message-ID: <87zfzhu9kx.fsf@kernel.org>
Date:   Mon, 13 Nov 2023 14:22:22 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Luca Weiss <luca.weiss@...rphone.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        cros-qcom-dts-watchers@...omium.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Matti Lehtimäki <matti.lehtimaki@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        ath11k@...ts.infradead.org
Subject: Re: [PATCH 9/9] arm64: dts: qcom: qcm6490-fairphone-fp5: Enable WiFi

(adding ath11k list)

Dmitry Baryshkov <dmitry.baryshkov@...aro.org> writes:

> [Added Kalle to the CC list]
>
> On Tue, 31 Oct 2023 at 12:31, Luca Weiss <luca.weiss@...rphone.com> wrote:
>>
>> On Mon Oct 30, 2023 at 8:26 PM CET, Konrad Dybcio wrote:
>> > On 27.10.2023 16:20, Luca Weiss wrote:
>> > > Now that the WPSS remoteproc is enabled, enable wifi so we can use it.
>> > >
>> > > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
>> > > ---
>> > >  arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 4 ++++
>> > >  1 file changed, 4 insertions(+)
>> > >
>> > > diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
>> > > index d65eef30091b..e7e20f73cbe6 100644
>> > > --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
>> > > +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
>> > > @@ -713,3 +713,7 @@ &venus {
>> > >     firmware-name = "qcom/qcm6490/fairphone5/venus.mbn";
>> > >     status = "okay";
>> > >  };
>> > > +
>> > > +&wifi {
>> > > +   status = "okay";
>> > qcom,ath11k-calibration-variant?
>>
>> What value would I put there for my device? Based on existing usages
>> (mostly for ath10k) I'd say "Fairphone_5"?
>
> I think this is fine.

>From style point of view I would prefer lower case and dashes, for
example "fairphone-5" but I'm just nitpicking, uppercase and underscores
work fine as well.

If you have different SKUs or similar which need different ath11k board
files being more specific like "fairphone-5-eu" and "fairphone-5-us" is
one option. But I'm sure Luca knows best what is needed for Fairphone,
just throwing out ideas here.

>> And you mean I should add this property in dts before even looking into
>> the firmware/calibration side of it?
>
> From my experience some (most?) of the device manufacturers do the
> wrong thing here. They do not program a sensible board_id, leaving it
> as 0xff or some other semi-random value. The calibration variant is
> the only way for the kernel to distinguish between such poor devices.
>
> The kernel will do a smart thing though. If the device-specific
> calibration data is not present, it will try to fall back to the
> generic data.

You are correct, just to be specific it's ath11k which will choose which
board file to use. I recommend always setting
qcom,ath11k-calibration-variant in DTS if you can.

Back in the day I have tried to push for the firmware team to improve
the board file selection but no success. So the only practical solution
we have is qcom,ath11k-calibration-variant in DTS.

-- 
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