| From eb4f8d2951913d2b1e7331e7447c1beac250b675 Mon Sep 17 00:00:00 2001 |
| From: Niklas Cassel <niklas.cassel@linaro.org> |
| Date: Mon, 14 Oct 2019 14:09:20 +0200 |
| Subject: [PATCH] arm64: dts: qcom: qcs404-evb: Set vdd_apc regulator in high |
| power mode |
| |
| 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: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi b/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi |
| index d987d6741e40..9c1803f7e493 100644 |
| --- a/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi |
| +++ b/arch/arm64/boot/dts/qcom/qcs404-evb.dtsi |
| @@ -63,6 +63,7 @@ |
| regulator-always-on; |
| regulator-boot-on; |
| regulator-name = "vdd_apc"; |
| + regulator-initial-mode = <1>; |
| regulator-min-microvolt = <1048000>; |
| regulator-max-microvolt = <1352000>; |
| }; |
| -- |
| 2.7.4 |
| |
