linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sc8280xp-crd: Add PCIe CLKREQ# sleep state

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Message-ID: <20231229171425.GC9098@thinkpad>
Date: Fri, 29 Dec 2023 22:44:25 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sc8280xp-crd: Add PCIe CLKREQ#
 sleep state

On Wed, Dec 27, 2023 at 11:28:28PM +0100, Konrad Dybcio wrote:
> The CLKREQ pin should not be muxed to its active function when the RC
> is asleep. Add the missing pin sleep states to resolve that.
> 

I don't understand why it should not be muxed and wondering what is the actual
issue you are seeing that lead to this conclusion.

- Mani

> Fixes: d907fe5acbf1 ("arm64: dts: qcom: sc8280xp-crd: enable WiFi controller")
> Fixes: 17e2ccaf65d1 ("arm64: dts: qcom: sc8280xp-crd: enable SDX55 modem")
> Fixes: 6a1ec5eca73c ("arm64: dts: qcom: sc8280xp-crd: enable NVMe SSD")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts | 78 ++++++++++++++++++++-----------
>  1 file changed, 51 insertions(+), 27 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> index ffc4406422ae..58c0c2d10cb3 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> @@ -530,8 +530,9 @@ &pcie2a {
>  
>  	vddpe-3v3-supply = <&vreg_nvme>;
>  
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pcie2a_default>;
> +	pinctrl-0 = <&pcie2a_default>, <&pcie2a_clkreq_default>;
> +	pinctrl-1 = <&pcie2a_default>, <&pcie2a_clkreq_sleep>;
> +	pinctrl-names = "default", "sleep";
>  
>  	status = "okay";
>  };
> @@ -549,8 +550,9 @@ &pcie3a {
>  
>  	vddpe-3v3-supply = <&vreg_wwan>;
>  
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pcie3a_default>;
> +	pinctrl-0 = <&pcie3a_default>, <&pcie3a_clkreq_default>;
> +	pinctrl-1 = <&pcie3a_default>, <&pcie3a_clkreq_sleep>;
> +	pinctrl-names = "default", "sleep";
>  
>  	status = "okay";
>  };
> @@ -568,8 +570,9 @@ &pcie4 {
>  
>  	vddpe-3v3-supply = <&vreg_wlan>;
>  
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pcie4_default>;
> +	pinctrl-0 = <&pcie4_default>, <&pcie4_clkreq_default>;
> +	pinctrl-1 = <&pcie4_default>, <&pcie4_clkreq_sleep>;
> +	pinctrl-names = "default", "sleep";
>  
>  	status = "okay";
>  };
> @@ -835,13 +838,6 @@ nvme_reg_en: nvme-reg-en-state {
>  	};
>  
>  	pcie2a_default: pcie2a-default-state {
> -		clkreq-n-pins {
> -			pins = "gpio142";
> -			function = "pcie2a_clkreq";
> -			drive-strength = <2>;
> -			bias-pull-up;
> -		};
> -
>  		perst-n-pins {
>  			pins = "gpio143";
>  			function = "gpio";
> @@ -857,14 +853,21 @@ wake-n-pins {
>  	       };
>  	};
>  
> -	pcie3a_default: pcie3a-default-state {
> -		clkreq-n-pins {
> -			pins = "gpio150";
> -			function = "pcie3a_clkreq";
> -			drive-strength = <2>;
> -			bias-pull-up;
> -		};
> +	pcie2a_clkreq_default: pcie2a-clkreq-default-state {
> +		pins = "gpio142";
> +		function = "pcie2a_clkreq";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
> +
> +	pcie2a_clkreq_sleep: pcie2a-clkreq-sleep-state {
> +		pins = "gpio142";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
>  
> +	pcie3a_default: pcie3a-default-state {
>  		perst-n-pins {
>  			pins = "gpio151";
>  			function = "gpio";
> @@ -880,14 +883,21 @@ wake-n-pins {
>  		};
>  	};
>  
> -	pcie4_default: pcie4-default-state {
> -		clkreq-n-pins {
> -			pins = "gpio140";
> -			function = "pcie4_clkreq";
> -			drive-strength = <2>;
> -			bias-pull-up;
> -		};
> +	pcie3a_clkreq_default: pcie3a-clkreq-default-state {
> +		pins = "gpio150";
> +		function = "pcie3a_clkreq";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
>  
> +	pcie3a_clkreq_sleep: pcie3a-clkreq-sleep-state {
> +		pins = "gpio150";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
> +
> +	pcie4_default: pcie4-default-state {
>  		perst-n-pins {
>  			pins = "gpio141";
>  			function = "gpio";
> @@ -903,6 +913,20 @@ wake-n-pins {
>  		};
>  	};
>  
> +	pcie4_clkreq_default: pcie4-clkreq-default-state {
> +		pins = "gpio140";
> +		function = "pcie4_clkreq";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
> +
> +	pcie4_clkreq_sleep: pcie4-clkreq-sleep-state {
> +		pins = "gpio140";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
> +
>  	sdc2_default_state: sdc2-default-state {
>  		clk-pins {
>  			pins = "sdc2_clk";
> 
> -- 
> 2.43.0
> 
> 

-- 
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