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COOLING4d

[PATCH 3/8] arm64: dts: qcom: monaco: Add t-power-on-us property for PCIe root ports

From: Krishna Chaitanya Chundru <hidden>
Date: 2026-09-11 06:50:28
Also in: linux-arm-msm, lkml
Subsystem: arm/qualcomm mailing list, arm/qualcomm support, the rest · Maintainers: Bjorn Andersson, Konrad Dybcio, Linus Torvalds

Currently the PCIe controller is not programming the T_POWER_ON value,
which can result in improper L1.2 exit behavior. Add the
t-power-on-us property to the PCIe root ports so that this value is
correctly programmed during host initialization.

Signed-off-by: Krishna Chaitanya Chundru <redacted>
---
 arch/arm64/boot/dts/qcom/monaco.dtsi | 4 ++++
 1 file changed, 4 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/monaco.dtsi b/arch/arm64/boot/dts/qcom/monaco.dtsi
index cfe39f923224..d9c3669b5e1b 100644
--- a/arch/arm64/boot/dts/qcom/monaco.dtsi
+++ b/arch/arm64/boot/dts/qcom/monaco.dtsi
@@ -2402,6 +2402,8 @@ pcieport0: pcie@0 {
 				#size-cells = <2>;
 				ranges;
 				phys = <&pcie0_phy>;
+
+				t-power-on-us = <80>;
 			};
 		};
 
@@ -2593,6 +2595,8 @@ pcieport1: pcie@0 {
 				#size-cells = <2>;
 				ranges;
 				phys = <&pcie1_phy>;
+
+				t-power-on-us = <80>;
 			};
 		};
 
-- 
2.34.1
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