[PATCH] arm64: dts: qcom: qcs615-ride: Fixing power issue in LPM
From: Tingguo Cheng
Date: Wed Dec 11 2024 - 04:17:19 EST
Change all LPM to HPM for regulators init-mode and disallowed setting
mode. LPM mode provides at most 10/30mA current for consumers such as
UFS,eMMC,PCIe. That caused problems because consumers take much more
than that. At the same time, a lot of drivers didn't set load in code
that makes it impossible for regulator framework to know exaclty when
to switch mode.
Signed-off-by: Tingguo Cheng <quic_tingguoc@xxxxxxxxxxx>
---
At the beginning, The QCS615-ride device gets some power issues when
enabling peripherals on the board as well as in the SoC. After figuring
out the root cause which pointed to that drivers should tell the regula
tor framework the required current the devices need separately, so the
regulator framework can get to know when to switch modes to satisfy the
requirment. But a lot of drivers did not set load for peripherals. Some
did setting and some did not, which sometimes caused problem when LPM
of regulators is allowed. E.g. LDO12 supplies UFS and USB. UFS sets the
load of AmA(HPM), while USB PHY does not set any(0mA LPM). In this case,
USB can encounter insufficient power supply when UFS's going to sleep.
There is some discussion about this:
https://lore.kernel.org/all/5tbevb5wv2s43pccytv4qol4yhq4s7iw2mmqp23vt3ujqd6xev@hkioqmwoitbd/
---
arch/arm64/boot/dts/qcom/qcs615-ride.dts | 52 +++++---------------------------
1 file changed, 8 insertions(+), 44 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/qcs615-ride.dts b/arch/arm64/boot/dts/qcom/qcs615-ride.dts
index a25928933e2b66241258e418c6e5bc36c306101e..32db107dc660cff9d2ccbf19eceb5c5539c591a9 100644
--- a/arch/arm64/boot/dts/qcom/qcs615-ride.dts
+++ b/arch/arm64/boot/dts/qcom/qcs615-ride.dts
@@ -71,30 +71,21 @@ vreg_l1a: ldo1 {
regulator-name = "vreg_l1a";
regulator-min-microvolt = <488000>;
regulator-max-microvolt = <852000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l2a: ldo2 {
regulator-name = "vreg_l2a";
regulator-min-microvolt = <1650000>;
regulator-max-microvolt = <3100000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l3a: ldo3 {
regulator-name = "vreg_l3a";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1248000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l5a: ldo5 {
@@ -102,9 +93,6 @@ vreg_l5a: ldo5 {
regulator-min-microvolt = <875000>;
regulator-max-microvolt = <975000>;
regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
};
vreg_l7a: ldo7 {
@@ -112,9 +100,6 @@ vreg_l7a: ldo7 {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1900000>;
regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
};
vreg_l8a: ldo8 {
@@ -122,9 +107,6 @@ vreg_l8a: ldo8 {
regulator-min-microvolt = <1150000>;
regulator-max-microvolt = <1350000>;
regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
};
vreg_l10a: ldo10 {
@@ -132,59 +114,41 @@ vreg_l10a: ldo10 {
regulator-min-microvolt = <2950000>;
regulator-max-microvolt = <3312000>;
regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
};
vreg_l11a: ldo11 {
regulator-name = "vreg_l11a";
regulator-min-microvolt = <1232000>;
regulator-max-microvolt = <1260000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l12a: ldo12 {
regulator-name = "vreg_l12a";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1890000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l13a: ldo13 {
regulator-name = "vreg_l13a";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3230000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l15a: ldo15 {
regulator-name = "vreg_l15a";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1904000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l16a: ldo16 {
regulator-name = "vreg_l16a";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3312000>;
- regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
- regulator-allow-set-load;
- regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
- RPMH_REGULATOR_MODE_HPM>;
+ regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
};
vreg_l17a: ldo17 {
---
base-commit: 1b2ab8149928c1cea2d7eca30cd35bb7fe014053
change-id: 20241211-bug-fix-qcs615-ride-dts-lpm-power-issue-44e33c8dfd3d
Best regards,
--
Tingguo Cheng <quic_tingguoc@xxxxxxxxxxx>