Patch "MIPS: DTS: CI20: Raise VDDCORE voltage to 1.125 volts" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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 5.10-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-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c38e49be2a238e8f490e00b93265dd7220445a14
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 2a8999efe50a0..9839daca65d53 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -183,8 +183,8 @@ 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;
 			};