On 14-10-19, 14:09, Niklas Cassel wrote: > vdd_apc is the regulator that supplies the main CPU cluster. > > At sudden CPU load changes, we have noticed invalid page faults on > addresses with all bits shifted, as well as on addresses with individual > bits flipped. > > By putting the vdd_apc regulator in high power mode, the voltage drops > during sudden load changes will be less severe, and we have not been able > to reproduce the invalid page faults with the regulator in this mode.
Reviewed-by: Vinod Koul <vk...@kernel.org> This seems a good bug fix, maybe CC stable? > > Signed-off-by: Niklas Cassel <niklas.cas...@linaro.org> > Suggested-by: Bjorn Andersson <bjorn.anders...@linaro.org> > --- > arch/arm64/boot/dts/qcom/qcs404-evb.dtsi | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi > b/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi > index 501a7330dbc8..522d3ef72df5 100644 > --- a/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi > +++ b/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi > @@ -73,6 +73,7 @@ > regulator-always-on; > regulator-boot-on; > regulator-name = "vdd_apc"; > + regulator-initial-mode = <1>; > regulator-min-microvolt = <1048000>; > regulator-max-microvolt = <1384000>; > }; > -- > 2.21.0 -- ~Vinod
