linux-kernel - Re: [PATCH 1/3] arm64: dts: qcom: sc8280xp-crd: enable wifi

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Message-ID: <ZsdRrHK7kCYs7MJF@hovoldconsulting.com>
Date: Thu, 22 Aug 2024 16:56:44 +0200
From: Johan Hovold <johan@...nel.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 1/3] arm64: dts: qcom: sc8280xp-crd: enable wifi

On Tue, Aug 13, 2024 at 09:06:36PM +0200, Bartosz Golaszewski wrote:
> From: Konrad Dybcio <konradybcio@...nel.org>
> 
> Add nodes for the WCN6855 PMU, the WLAN module and relevant regulators
> and pin functions to enable wifi support on sc8280xp-crd.

What are you guys smoking? The Wi-Fi has been enabled on the CRD since
6.2 and commit d907fe5acbf1 ("arm64: dts: qcom: sc8280xp-crd: enable
WiFi controller").

> Signed-off-by: Konrad Dybcio <konradybcio@...nel.org>
> [Bartosz:
>   - write the commit message,
>   - rebase Konrad's commit,
>   - fix one of the supplies' name]
> Co-developed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts | 112 ++++++++++++++++++++++
>  1 file changed, 112 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> index 6020582b0a59..57efeefbc89e 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> @@ -177,6 +177,17 @@ vreg_misc_3p3: regulator-misc-3p3 {
>  		regulator-always-on;
>  	};
>  
> +	vreg_s10b: regulator-s10b {
> +		compatible = "regulator-fixed";

I don't think this is a fixed regulator.

> +
> +		regulator-name = "VREG_S10B";
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +
> +		regulator-always-on;
> +		regulator-boot-on;
> +	};
> +
>  	vreg_wlan: regulator-wlan {
>  		compatible = "regulator-fixed";
>  
 
> +&pcie4_port0 {
> +	wifi@0 {
> +		compatible = "pci17cb,1103";
> +		reg = <0x10000 0x0 0x0 0x0 0x0>;
> +
> +		vddrfacmn-supply = <&vreg_pmu_rfa_cmn_0p8>;
> +		vddaon-supply = <&vreg_pmu_aon_0p8>;
> +		vddwlcx-supply = <&vreg_pmu_wlcx_0p8>;
> +		vddwlmx-supply = <&vreg_pmu_wlmx_0p8>;
> +		vddpcie1p8-supply = <&vreg_pmu_pcie_1p8>;
> +		vddpcie0p9-supply = <&vreg_pmu_pcie_0p9>;
> +		vddrfa0p8-supply = <&vreg_pmu_rfa_0p8>;
> +		vddrfa1p2-supply = <&vreg_pmu_rfa_1p2>;
> +		vddrfa1p8-supply = <&vreg_pmu_rfa_1p7>;
> +
> +		qcom,ath11k-calibration-variant = "LE_X13S";

This is not the right calibration variant either. In fact, Qualcomm has
not yet released any calibration data for this CRD yet:

	https://bugzilla.kernel.org/show_bug.cgi?id=216036

I use a patch like this locally, but we shouldn't merge this upstream.
 
> +	wlan_en: wlan-en-state {
> +		pins = "gpio134";
> +		function = "gpio";
> +		drive-strength = <8>;

Why increase the drive strength?

> +		bias-pull-down;
> +	};

Johan