linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sa8155p-adp: fix SDHC2 configuration

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Message-ID: <ZhfVsww6fL3O7tsC@gerhold.net>
Date: Thu, 11 Apr 2024 14:21:07 +0200
From: Stephan Gerhold <stephan@...hold.net>
To: Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>
Cc: "stable@...r.kernel.org" <stable@...r.kernel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bhupesh Sharma <bhupesh.sharma@...aro.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sa8155p-adp: fix SDHC2 configuration

On Thu, Apr 11, 2024 at 11:55:55AM +0000, Volodymyr Babchuk wrote:
> There are multiple issues with SDHC2 configuration for SA8155P-ADP,
> which prevent use of SDHC2 and causes issues with ethernet:
> 
> - Card Detect pin for SHDC2 on SA8155P-ADP is connected to gpio4 of
>   PMM8155AU_1, not to SoC itself. SoC's gpio4 is used for DWMAC
>   TX. If sdhc driver probes after dwmac driver, it reconfigures
>   gpio4 and this breaks Ethernet MAC.
> 
> - pinctrl configuration mentions gpio96 as CD pin. It seems it was
>   copied from some SM8150 example, because as mentioned above,
>   correct CD pin is gpio4 on PMM8155AU_1.
> 
> - L13C voltage regulator limits minimal voltage to 2.504V, which
>   prevents use 1.8V to power SD card, which in turns does not allow
>   card to work in UHS mode.
> 
> This patch fixes all the mentioned issues.
> 
> Fixes: 0deb2624e2d0 ("arm64: dts: qcom: sa8155p-adp: Add support for uSD card")
> Cc: stable@...r.kernel.org
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@...m.com>
> 
> ---
> 
> In v2:
>  - Added "Fixes:" tag
>  - CCed stable ML
>  - Fixed pinctrl configuration
>  - Extended voltage range for L13C voltage regulator
> ---
>  arch/arm64/boot/dts/qcom/sa8155p-adp.dts | 32 +++++++++++-------------
>  1 file changed, 14 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8155p-adp.dts b/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
> index 5e4287f8c8cd1..b9d56bda96759 100644
> --- a/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
> +++ b/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
> @@ -283,7 +283,7 @@ vreg_l12c_1p808: ldo12 {
>  
>  		vreg_l13c_2p96: ldo13 {
>  			regulator-name = "vreg_l13c_2p96";
> -			regulator-min-microvolt = <2504000>;
> +			regulator-min-microvolt = <1800000>;
>  			regulator-max-microvolt = <2960000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>  		};
> @@ -384,10 +384,10 @@ &remoteproc_cdsp {
>  &sdhc_2 {
>  	status = "okay";
>  
> -	cd-gpios = <&tlmm 4 GPIO_ACTIVE_LOW>;
> +	cd-gpios = <&pmm8155au_1_gpios 4 GPIO_ACTIVE_LOW>;
>  	pinctrl-names = "default", "sleep";
> -	pinctrl-0 = <&sdc2_on>;
> -	pinctrl-1 = <&sdc2_off>;
> +	pinctrl-0 = <&sdc2_on &pmm8155au_1_sdc2_cd>;
> +	pinctrl-1 = <&sdc2_off &pmm8155au_1_sdc2_cd>;
>  	vqmmc-supply = <&vreg_l13c_2p96>; /* IO line power */
>  	vmmc-supply = <&vreg_l17a_2p96>;  /* Card power line */
>  	bus-width = <4>;
> @@ -505,13 +505,6 @@ data-pins {
>  			bias-pull-up;		/* pull up */
>  			drive-strength = <16>;	/* 16 MA */
>  		};
> -
> -		sd-cd-pins {
> -			pins = "gpio96";
> -			function = "gpio";
> -			bias-pull-up;		/* pull up */
> -			drive-strength = <2>;	/* 2 MA */
> -		};
>  	};
>  
>  	sdc2_off: sdc2-off-state {
> @@ -532,13 +525,6 @@ data-pins {
>  			bias-pull-up;		/* pull up */
>  			drive-strength = <2>;	/* 2 MA */
>  		};
> -
> -		sd-cd-pins {
> -			pins = "gpio96";
> -			function = "gpio";
> -			bias-pull-up;		/* pull up */
> -			drive-strength = <2>;	/* 2 MA */
> -		};
>  	};
>  
>  	usb2phy_ac_en1_default: usb2phy-ac-en1-default-state {
> @@ -604,3 +590,13 @@ phy-reset-pins {
>  		};
>  	};
>  };
> +
> +&pmm8155au_1_gpios {
> +	pmm8155au_1_sdc2_cd: pmm8155au_1-sdc2-cd {
> +			pins = "gpio4";
> +			function = "normal";
> +			input-enable;
> +			bias-pull-up;
> +			power-source = <0>;

Nitpick: There is one indentation level too much here (remove a tab).

Barely worth mentioning, but I guess there will be a v3 to address
Krzysztof's comments. :)

Thanks,
Stephan