linux-kernel - [PATCH 4.9 084/212] arm64: dts: exynos: Fix silent hang after boot on Espresso

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Message-Id: <20200820091606.601139326@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:20:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 084/212] arm64: dts: exynos: Fix silent hang after boot on Espresso

From: Alim Akhtar <alim.akhtar@...sung.com>

[ Upstream commit b072714bfc0e42c984b8fd6e069f3ca17de8137a ]

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@...sung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 c528dd52ba2d3..2f7d144d556da 100644
--- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
@@ -131,6 +131,7 @@ ldo7_reg: LDO7 {
 				regulator-min-microvolt = <700000>;
 				regulator-max-microvolt = <1150000>;
 				regulator-enable-ramp-delay = <125>;
+				regulator-always-on;
 			};
 
 			ldo8_reg: LDO8 {
-- 
2.25.1