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From: Johan Hovold <johan+linaro@kernel.org>
To: Bjorn Helgaas <bhelgaas@google.com>,
	Bjorn Andersson <andersson@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	=?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= <kw@linux.com>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	linux-arm-msm@vger.kernel.org,
	linux-pci@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Johan Hovold <johan+linaro@kernel.org>,
	stable@vger.kernel.org
Subject: [PATCH v3 07/10] arm64: dts: qcom: sc8280xp-crd: disable ASPM L0s for modem and Wi-Fi
Date: Tue,  5 Mar 2024 09:11:02 +0100
Message-ID: <20240305081105.11912-8-johan+linaro@kernel.org>
In-Reply-To: <20240305081105.11912-1-johan+linaro@kernel.org>
References: <20240305081105.11912-1-johan+linaro@kernel.org>
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There are indications that ASPM L0s is not working very well on this
machine so disable it also for the modem and Wi-Fi controllers for now.

This specifically avoids having the modem and Wi-Fi controllers bounce
in an out of L0s when not used (the modem still bounces in and out of
L1) as well as intermittent Correctable errors on the Wi-Fi link when
not used.

Fixes: 9f4f3dfad8cf ("PCI: qcom: Enable ASPM for platforms supporting 1.9.0 ops")
Cc: stable@vger.kernel.org      # 6.7
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp-crd.dts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
index 7e94a68d5d9f..8fc0380f65a0 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
+++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
@@ -546,6 +546,8 @@ &pcie2a_phy {
 };
 
 &pcie3a {
+	aspm-no-l0s;
+
 	perst-gpios = <&tlmm 151 GPIO_ACTIVE_LOW>;
 	wake-gpios = <&tlmm 148 GPIO_ACTIVE_LOW>;
 
@@ -566,6 +568,7 @@ &pcie3a_phy {
 
 &pcie4 {
 	max-link-speed = <2>;
+	aspm-no-l0s;
 
 	perst-gpios = <&tlmm 141 GPIO_ACTIVE_LOW>;
 	wake-gpios = <&tlmm 139 GPIO_ACTIVE_LOW>;
-- 
2.43.0