* [PATCH 1/2] arm64: dts: exynos: Fix silent hang after boot
[not found] <CGME20200705071805epcas5p37045f009655c40d573077babf17c51fa@epcas5p3.samsung.com>
@ 2020-07-05 6:57 ` Alim Akhtar
[not found] ` <CGME20200705071806epcas5p27abbd5b89689ab16328807bb5a213abf@epcas5p2.samsung.com>
0 siblings, 1 reply; 2+ messages in thread
From: Alim Akhtar @ 2020-07-05 6:57 UTC (permalink / raw)
To: rzk
Cc: devicetree, linux-arm-kernel, linux-samsung-soc, linux-kernel,
robh+dt, Alim Akhtar
Once regulators are disabled after kernel boot, on espresso
board silent hang observed because of LDO7 being disabled.
LDO7 actually provide power to CPU cores and non-cpu blocks
circuitries.
Keep this regulator always-on to fix this hang.
Fixes: 9589f7721e16 ("arm64: dts: Add S2MPS15 PMIC node on exynos7-espresso")
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
arch/arm64/boot/dts/exynos/exynos7-espresso.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
index 790f12ca8981..bb86950032d3 100644
--- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
@@ -157,6 +157,7 @@
regulator-min-microvolt = <700000>;
regulator-max-microvolt = <1150000>;
regulator-enable-ramp-delay = <125>;
+ regulator-always-on;
};
ldo8_reg: LDO8 {
base-commit: 9e50b94b3eb0d859a2586b5a40d7fd6e5afd9210
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 2/2] arm64: dts: exynos: keep LDO12 always-on
[not found] ` <CGME20200705071806epcas5p27abbd5b89689ab16328807bb5a213abf@epcas5p2.samsung.com>
@ 2020-07-05 6:57 ` Alim Akhtar
0 siblings, 0 replies; 2+ messages in thread
From: Alim Akhtar @ 2020-07-05 6:57 UTC (permalink / raw)
To: rzk
Cc: devicetree, linux-arm-kernel, linux-samsung-soc, linux-kernel,
robh+dt, Alim Akhtar
LDO12 on exynos7 supply power to VDDQ_UFS20_RESET,
in case this regulator is OFF, UFS host controller
can not send command to UFS device. To keep this supply
ON, set regulator-always-on property for this ldo.
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
arch/arm64/boot/dts/exynos/exynos7-espresso.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
index bb86950032d3..92fecc539c6c 100644
--- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
@@ -194,6 +194,7 @@
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1300000>;
regulator-enable-ramp-delay = <125>;
+ regulator-always-on;
};
ldo13_reg: LDO13 {
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-07-05 7:18 UTC | newest]
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2020-07-05 6:57 ` [PATCH 1/2] arm64: dts: exynos: Fix silent hang after boot Alim Akhtar
[not found] ` <CGME20200705071806epcas5p27abbd5b89689ab16328807bb5a213abf@epcas5p2.samsung.com>
2020-07-05 6:57 ` [PATCH 2/2] arm64: dts: exynos: keep LDO12 always-on Alim Akhtar
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