From ddefb00f1b76423543c4fc1d374dc2fe65b4a0dc Mon Sep 17 00:00:00 2001 From: Stephan Gerhold Date: Wed, 17 May 2023 20:48:40 +0200 Subject: [PATCH] arm64: dts: qcom: apq8016-sbc: Fix regulator constraints [ Upstream commit e27654df20d77ad7549a3cf6739ebaa3aa59a088 ] For some reason DB410c has completely bogus regulator constraints that actually just correspond to the programmable voltages which are already provided by the regulator driver. Some of them are not just outside the recommended operating conditions of the APQ8016E SoC but even exceed the absolute maximum ratings, potentially risking permanent device damage. In practice it's not quite as dangerous thanks to the RPM firmware: It turns out that it has its own voltage constraints and silently clamps all regulator requests. For example, requesting 3.3V for L5 (allowed by the current regulator constraints!) still results in 1.8V being programmed in the actual regulator hardware. Experimentation with various voltages shows that the internal RPM voltage constraints roughly correspond to the safe "specified range" in the PM8916 Device Specification (rather than the "programmable range" used inside apq8016-sbc.dtsi right now). Combine those together with some fixed voltages used in the old msm-3.10 device tree from Qualcomm to give DB410c some actually valid voltage constraints. Cc: Srinivas Kandagatla Fixes: 4c7d53d16d77 ("arm64: dts: apq8016-sbc: add regulators support") Signed-off-by: Stephan Gerhold Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20230510-msm8916-regulators-v1-1-54d4960a05fc@gerhold.net Signed-off-by: Sasha Levin --- arch/arm64/boot/dts/qcom/apq8016-sbc.dts | 64 ++++++++++++------------ 1 file changed, 32 insertions(+), 32 deletions(-) diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dts b/arch/arm64/boot/dts/qcom/apq8016-sbc.dts index 27ceaa94c8bda..d7d7a826b8be4 100644 --- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dts +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dts @@ -447,21 +447,21 @@ vdd_l7-supply = <&pm8916_s4>; s3 { - regulator-min-microvolt = <375000>; - regulator-max-microvolt = <1562000>; + regulator-min-microvolt = <1250000>; + regulator-max-microvolt = <1350000>; }; s4 { - regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <1800000>; + regulator-min-microvolt = <1850000>; + regulator-max-microvolt = <2150000>; regulator-always-on; regulator-boot-on; }; l1 { - regulator-min-microvolt = <375000>; - regulator-max-microvolt = <1525000>; + regulator-min-microvolt = <1225000>; + regulator-max-microvolt = <1225000>; }; l2 { @@ -470,13 +470,13 @@ }; l4 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <2050000>; + regulator-max-microvolt = <2050000>; }; l5 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; }; l6 { @@ -485,45 +485,45 @@ }; l7 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; }; l8 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <2900000>; + regulator-max-microvolt = <2900000>; }; l9 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; }; l10 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <2800000>; + regulator-max-microvolt = <2800000>; }; l11 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <2950000>; + regulator-max-microvolt = <2950000>; regulator-allow-set-load; regulator-system-load = <200000>; }; l12 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <2950000>; }; l13 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <3075000>; + regulator-max-microvolt = <3075000>; }; l14 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <3300000>; }; /** @@ -531,14 +531,14 @@ * for mezzanine boards */ l15 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <1800000>; regulator-always-on; }; l16 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <1800000>; + regulator-max-microvolt = <3300000>; }; l17 { @@ -547,8 +547,8 @@ }; l18 { - regulator-min-microvolt = <1750000>; - regulator-max-microvolt = <3337000>; + regulator-min-microvolt = <2700000>; + regulator-max-microvolt = <2700000>; }; }; -- 2.47.2