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.
commit c96a8fa07d1e6047ee16bc780ce2d85e79f61d86
Author: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Date: Thu Jun 22 19:59:34 2023 +0200
MIPS: DTS: CI20: Raise VDDCORE voltage to 1.125 volts
[ Upstream commit 944520f85d5b1fb2f9ea243be41f9c9af3d4cef3 ]
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: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 2a6c971867795..d3661ff0f0003 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -222,8 +222,8 @@ act8600: act8600@5a {
regulators {
vddcore: DCDC1 {
- regulator-min-microvolt = <1100000>;
- regulator-max-microvolt = <1100000>;
+ regulator-min-microvolt = <1125000>;
+ regulator-max-microvolt = <1125000>;
vp1-supply = <&vcc_33v>;
regulator-always-on;
};
