From: Niklas Cassel niklas.cassel@linaro.org
commit eac8ce86cb90ba96cb4bcbf2549d7a8b6938aa30 upstream.
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.
Fixes: 8faea8edbb35 ("arm64: dts: qcom: qcs404-evb: add spmi regulators") Cc: stable@vger.kernel.org Suggested-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Niklas Cassel niklas.cassel@linaro.org Reviewed-by: Vinod Koul vkoul@kernel.org Link: https://lore.kernel.org/r/20191014120920.12691-1-niklas.cassel@linaro.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm64/boot/dts/qcom/qcs404-evb.dtsi | 1 + 1 file changed, 1 insertion(+)
--- 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>; };