This is a note to let you know that I've just added the patch titled
MIPS: DTS: CI20: Raise VDDCORE voltage to 1.125 volts
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-dts-ci20-raise-vddcore-voltage-to-1.125-volts.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 944520f85d5b1fb2f9ea243be41f9c9af3d4cef3 Mon Sep 17 00:00:00 2001
From: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Date: Thu, 22 Jun 2023 19:59:34 +0200
Subject: MIPS: DTS: CI20: Raise VDDCORE voltage to 1.125 volts
From: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
commit 944520f85d5b1fb2f9ea243be41f9c9af3d4cef3 upstream.
Commit 08384e80a70f ("MIPS: DTS: CI20: Fix ACT8600 regulator node
names") caused the VDDCORE power supply (regulated by the ACT8600's
DCDC1 output) to drop from a voltage of 1.2V configured by the
bootloader, to the 1.1V set in the Device Tree.
According to the documentation, the VDDCORE supply should be between
0.99V and 1.21V; both values are therefore within the supported range.
However, VDDCORE being 1.1V results in the CI20 being very unstable,
with corrupted memory, failures to boot, or reboots at random. The
reason might be succint drops of the voltage below the minimum required.
Raising the minimum voltage to 1.125 volts seems to be enough to address
this issue, while still keeping a relatively low core voltage which
helps for power consumption and thermals.
Fixes: 08384e80a70f ("MIPS: DTS: CI20: Fix ACT8600 regulator node names")
Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/boot/dts/ingenic/ci20.dts | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -222,8 +222,8 @@
regulators {
vddcore: DCDC1 {
- regulator-min-microvolt = <1100000>;
- regulator-max-microvolt = <1100000>;
+ regulator-min-microvolt = <1125000>;
+ regulator-max-microvolt = <1125000>;
regulator-always-on;
};
vddmem: DCDC2 {
Patches currently in stable-queue which might be from paul@xxxxxxxxxxxxxxx are
queue-5.15/mips-dts-ci20-raise-vddcore-voltage-to-1.125-volts.patch
queue-5.15/mips-dts-ci20-fix-act8600-regulator-node-names.patch
