linux-kernel - [PATCH v3 09/10] arm64: dts: qcom: sc8280xp-x13s: disable ASPM L0s for NVMe and modem

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Message-ID: <20240305081105.11912-10-johan+linaro@kernel.org>
Date: Tue,  5 Mar 2024 09:11:04 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Bjorn Andersson <andersson@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	linux-arm-msm@...r.kernel.org,
	linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>,
	stable@...r.kernel.org
Subject: [PATCH v3 09/10] arm64: dts: qcom: sc8280xp-x13s: disable ASPM L0s for NVMe and modem

There are indications that ASPM L0s is not working very well on this
machine so disable it also for the NVMe and modem controllers for now.

Note that this is done as a precaution based on problems with the Wi-Fi
on the X13s as well as the NVMe, modem and Wi-Fi on the sc8280xp-crd
reference design (the NVMe controller on my X13s does not support L0s
and the machine lacks a modem).

Fixes: 9f4f3dfad8cf ("PCI: qcom: Enable ASPM for platforms supporting 1.9.0 ops")
Cc: stable@...r.kernel.org      # 6.7
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
index 9567b82db9a5..057e4d9d3c0f 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
+++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
@@ -695,6 +695,8 @@ keyboard@68 {
 };
 
 &pcie2a {
+	aspm-no-l0s;
+
 	perst-gpios = <&tlmm 143 GPIO_ACTIVE_LOW>;
 	wake-gpios = <&tlmm 145 GPIO_ACTIVE_LOW>;
 
@@ -714,6 +716,8 @@ &pcie2a_phy {
 };
 
 &pcie3a {
+	aspm-no-l0s;
+
 	perst-gpios = <&tlmm 151 GPIO_ACTIVE_LOW>;
 	wake-gpios = <&tlmm 148 GPIO_ACTIVE_LOW>;
 
-- 
2.43.0