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From: Paul Cercueil <paul@crapouillou.net>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Alim Akhtar <alim.akhtar@samsung.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Paul Cercueil <paul@crapouillou.net>,
	stable@vger.kernel.org
Subject: [PATCH] ARM: dts: exynos/i9100: Unconditionally enable LDO12
Date: Tue,  8 Aug 2023 13:03:41 +0200	[thread overview]
Message-ID: <20230808110341.57891-1-paul@crapouillou.net> (raw)

The kernel hangs for a good 12 seconds without any info being printed to
dmesg, very early in the boot process, if this regulator is not enabled.

Force-enable it to work around this issue, until we know more about the
underlying problem.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Fixes: 8620cc2f99b7 ("ARM: dts: exynos: Add devicetree file for the Galaxy S2")
Cc: <stable@vger.kernel.org> # v5.8+
---
 arch/arm/boot/dts/exynos4210-i9100.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4210-i9100.dts b/arch/arm/boot/dts/exynos4210-i9100.dts
index a9ec1f6c1dea..a076a1dfe41f 100644
--- a/arch/arm/boot/dts/exynos4210-i9100.dts
+++ b/arch/arm/boot/dts/exynos4210-i9100.dts
@@ -527,6 +527,14 @@ vtcam_reg: LDO12 {
 				regulator-name = "VT_CAM_1.8V";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
+
+				/*
+				 * Force-enable this regulator; otherwise the
+				 * kernel hangs very early in the boot process
+				 * for about 12 seconds, without apparent
+				 * reason.
+				 */
+				regulator-always-on;
 			};
 
 			vcclcd_reg: LDO13 {
-- 
2.40.1


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WARNING: multiple messages have this Message-ID (diff)
From: Paul Cercueil <paul@crapouillou.net>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Alim Akhtar <alim.akhtar@samsung.com>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Paul Cercueil <paul@crapouillou.net>,
	stable@vger.kernel.org
Subject: [PATCH] ARM: dts: exynos/i9100: Unconditionally enable LDO12
Date: Tue,  8 Aug 2023 13:03:41 +0200	[thread overview]
Message-ID: <20230808110341.57891-1-paul@crapouillou.net> (raw)

The kernel hangs for a good 12 seconds without any info being printed to
dmesg, very early in the boot process, if this regulator is not enabled.

Force-enable it to work around this issue, until we know more about the
underlying problem.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Fixes: 8620cc2f99b7 ("ARM: dts: exynos: Add devicetree file for the Galaxy S2")
Cc: <stable@vger.kernel.org> # v5.8+
---
 arch/arm/boot/dts/exynos4210-i9100.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4210-i9100.dts b/arch/arm/boot/dts/exynos4210-i9100.dts
index a9ec1f6c1dea..a076a1dfe41f 100644
--- a/arch/arm/boot/dts/exynos4210-i9100.dts
+++ b/arch/arm/boot/dts/exynos4210-i9100.dts
@@ -527,6 +527,14 @@ vtcam_reg: LDO12 {
 				regulator-name = "VT_CAM_1.8V";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
+
+				/*
+				 * Force-enable this regulator; otherwise the
+				 * kernel hangs very early in the boot process
+				 * for about 12 seconds, without apparent
+				 * reason.
+				 */
+				regulator-always-on;
 			};
 
 			vcclcd_reg: LDO13 {
-- 
2.40.1


             reply	other threads:[~2023-08-08 11:04 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-08 11:03 Paul Cercueil [this message]
2023-08-08 11:03 ` [PATCH] ARM: dts: exynos/i9100: Unconditionally enable LDO12 Paul Cercueil
2023-08-10  6:21 ` Krzysztof Kozlowski
2023-08-10  6:21   ` Krzysztof Kozlowski
2023-08-10  9:20   ` Paul Cercueil
2023-08-10  9:20     ` Paul Cercueil

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