linux-kernel - [PATCH v2] arm64: dts: qcom: sa8540p-ride: disable pcie2a node

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Date: Tue, 9 Jan 2024 10:20:50 -0500
From: Lucas Karpinski <lkarpins@...hat.com>
To: Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] arm64: dts: qcom: sa8540p-ride: disable pcie2a node

pcie2a and pcie3a both cause interrupt storms to occur. However, when
both are enabled simultaneously, the two combined interrupt storms will
lead to rcu stalls. Red Hat is the only company still using this board
and since we still need pcie3a, just disable pcie2a.

Signed-off-by: Lucas Karpinski <lkarpins@...hat.com>
---
v2:
- don't remove the entire pcie2a node, just set status to disabled.
- update commit message.

 arch/arm64/boot/dts/qcom/sa8540p-ride.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
index b04f72ec097c..177b9dad6ff7 100644
--- a/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
+++ b/arch/arm64/boot/dts/qcom/sa8540p-ride.dts
@@ -376,14 +376,14 @@ &pcie2a {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pcie2a_default>;
 
-	status = "okay";
+	status = "disabled";
 };
 
 &pcie2a_phy {
 	vdda-phy-supply = <&vreg_l11a>;
 	vdda-pll-supply = <&vreg_l3a>;
 
-	status = "okay";
+	status = "disabled";
 };
 
 &pcie3a {
-- 
2.43.0