linux-kernel - Re: [PATCH 5/5] arm64: dts: qcom: msm8916: Enable modem and WiFi

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Date:   Fri, 19 Mar 2021 16:19:14 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, wcn36xx@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] arm64: dts: qcom: msm8916: Enable modem and WiFi

Hi Bjorn,

On Thu, Mar 11, 2021 at 04:33:18PM -0800, Bjorn Andersson wrote:
> Enable the modem and WiFi subsystems and specify msm8916 specific
> firmware path for these and the WCNSS control service.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>

The changes itself look good to me, but the commit message is really
misleading. It does not mention anywhere that the change actually just
enables "modem" on apq8016-sbc instead of "msm8916". :)

Also, WCNSS was actually enabled before already (with the default
firmware path). In my opinion, it would be clearer to change the
firmware-name for it in an extra patch.

> ---
>  arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 12 ++++++++++++
>  arch/arm64/boot/dts/qcom/msm8916.dtsi     |  2 +-
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> index 6aef0c2e4f0a..448e3561ef63 100644
> --- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> @@ -305,6 +305,12 @@ &mdss {
>  	status = "okay";
>  };
>  
> +&mpss {
> +	status = "okay";
> +
> +	firmware-name = "qcom/msm8916/mba.mbn", "qcom/msm8916/modem.mbn";
> +};
> +
>  &pm8916_resin {
>  	status = "okay";
>  	linux,code = <KEY_VOLUMEDOWN>;
> @@ -312,6 +318,8 @@ &pm8916_resin {
>  
>  &pronto {
>  	status = "okay";
> +
> +	firmware-name = "qcom/msm8916/wcnss.mbn";
>  };
>  

How do I get a .mbn from the wcnss.{mdt,.b??} files provided in the
DB410c firmware package? I guess I should just run them through
https://github.com/andersson/pil-squasher?

Also, is the single file format (mbn) preferred now? Not sure if there
is any significant difference except having less files laying around.

Thanks,
Stephan