On Thu, Jun 22, 2023 at 07:59:34PM +0200, Paul Cercueil wrote:
> 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>
>
> ---
> Cc: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
> ---
> arch/mips/boot/dts/ingenic/ci20.dts | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
> index cec0caa2350c..a141a699b790 100644
> --- a/arch/mips/boot/dts/ingenic/ci20.dts
> +++ b/arch/mips/boot/dts/ingenic/ci20.dts
> @@ -298,8 +298,8 @@ 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;
> };
> --
> 2.40.1
applied to mips-next.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
