From: Niklas Cassel <niklas.cassel@linaro.org>
To: Andy Gross <agross@kernel.org>,
David Brown <david.brown@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Cc: amit.kucheria@linaro.org, bjorn.andersson@linaro.org,
Niklas Cassel <niklas.cassel@linaro.org>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] arm64: dts: msm8996: fix PSCI entry-latency-us
Date: Tue, 4 Jun 2019 14:29:31 +0200 [thread overview]
Message-ID: <20190604122931.22235-1-niklas.cassel@linaro.org> (raw)
The current entry-latency-us is too short.
The proper way to convert between the device tree properties
from the vendor tree to the upstream PSCI device tree properties is:
entry-latency-us = qcom,time-overhead - qcom,latency-us
which gives
entry-latency-us = 210 - 80 = 130
Fixes: f6aee7af59b6 ("arm64: dts: qcom: msm8996: Add PSCI cpuidle low power states")
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
---
arch/arm64/boot/dts/qcom/msm8996.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
index b7cf2a17dcb5..e8c03b5c8990 100644
--- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
@@ -174,7 +174,7 @@
compatible = "arm,idle-state";
idle-state-name = "standalone-power-collapse";
arm,psci-suspend-param = <0x00000004>;
- entry-latency-us = <40>;
+ entry-latency-us = <130>;
exit-latency-us = <80>;
min-residency-us = <300>;
};
--
2.21.0
next reply other threads:[~2019-06-04 12:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-04 12:29 Niklas Cassel [this message]
2019-06-08 3:50 ` Bjorn Andersson
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