linux-kernel - Re: [PATCH 3/8] arm64: dts: qcom: msm8916: Fix regulator constraints

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Date:   Fri, 26 May 2023 14:38:01 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 3/8] arm64: dts: qcom: msm8916: Fix regulator constraints

On 17/05/2023 19:48, Stephan Gerhold wrote:
> The regulator constraints for most MSM8916 devices (except DB410c) were
> originally taken from Qualcomm's msm-3.10 vendor device tree (for lack
> of better documentation). Unfortunately it turns out that Qualcomm's
> voltages are slightly off as well and do not match the voltage
> constraints applied by the RPM firmware.
> 
> This means that we sometimes request a specific voltage but the RPM
> firmware actually applies a much lower or higher voltage. This is
> particularly critical for pm8916_l11 which is used as SD card VMMC
> regulator: The SD card can choose a voltage from the current range of
> 1.8 - 2.95V. If it chooses to run at 1.8V we pretend that this is fine
> but the RPM firmware will still silently end up configuring 2.95V.
> This can be easily reproduced with a multimeter or by checking the
> SPMI hardware registers of the regulator.
> 
> Fix this by making the voltages match the actual "specified range" in
> the PM8916 Device Specification which is enforced by the RPM firmware.
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
>   arch/arm64/boot/dts/qcom/msm8916-acer-a1-724.dts           | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-alcatel-idol347.dts       | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-asus-z00l.dts             | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-gplus-fl8005a.dts         | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-huawei-g7.dts             | 12 ++++++------
>   arch/arm64/boot/dts/qcom/msm8916-longcheer-l8150.dts       | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-longcheer-l8910.dts       | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-samsung-gt5-common.dtsi   | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-samsung-j5-common.dtsi    | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts     | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-ufi.dtsi                  | 14 +++++++-------
>   arch/arm64/boot/dts/qcom/msm8916-wingtech-wt88047.dts      | 12 ++++++------
>   13 files changed, 89 insertions(+), 89 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8916-acer-a1-724.dts b/arch/arm64/boot/dts/qcom/msm8916-acer-a1-724.dts
> index 13cd9ad167df..0d517804e44e 100644
> --- a/arch/arm64/boot/dts/qcom/msm8916-acer-a1-724.dts
> +++ b/arch/arm64/boot/dts/qcom/msm8916-acer-a1-724.dts
> @@ -159,13 +159,13 @@ &smd_rpm_regulators {
>   	vdd_l7-supply = <&pm8916_s4>;
>   
>   	s3 {
> -		regulator-min-microvolt = <1200000>;
> -		regulator-max-microvolt = <1300000>;
> +		regulator-min-microvolt = <1250000>;
> +		regulator-max-microvolt = <1350000>;

Where are you getting these 5s from ?

>   	};
>   
>   	s4 {
> -		regulator-min-microvolt = <1800000>;
> -		regulator-max-microvolt = <2100000>;
> +		regulator-min-microvolt = <1850000>;
> +		regulator-max-microvolt = <2150000>;
>   	};
>   
>   	l1 {
> @@ -199,7 +199,7 @@ l7 {
>   	};
>   
>   	l8 {
> -		regulator-min-microvolt = <2850000>;
> +		regulator-min-microvolt = <2900000>;
>   		regulator-max-microvolt = <2900000>;
>   	};
>   
> @@ -209,12 +209,12 @@ l9 {
>   	};
>   
>   	l10 {
> -		regulator-min-microvolt = <2700000>;
> +		regulator-min-microvolt = <2800000>;
>   		regulator-max-microvolt = <2800000>;
>   	};
>   
>   	l11 {
> -		regulator-min-microvolt = <1800000>;
> +		regulator-min-microvolt = <2950000>;

Wouldn't 1v8 be the right voltage for eMMC !SD though have you tested 
eMMC instead of SD ?

---
bod