linux-kernel - [PATCH v1 1/4] arm64: dts: qcom: qrb2210-rb1: Fix UART3 wakeup IRQ storm

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Message-Id: <20251110101043.2108414-2-praveen.talari@oss.qualcomm.com>
Date: Mon, 10 Nov 2025 15:40:40 +0530
From: Praveen Talari <praveen.talari@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-serial@...r.kernel.org, alexey.klimov@...aro.org,
        krzk@...nel.org, bryan.odonoghue@...aro.org,
        jorge.ramirez@....qualcomm.com, dmitry.baryshkov@....qualcomm.com
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>, psodagud@...cinc.com,
        djaggi@...cinc.com, quic_msavaliy@...cinc.com,
        quic_vtanuku@...cinc.com, quic_arandive@...cinc.com,
        quic_shazhuss@...cinc.com, quic_cchiluve@...cinc.com,
        Praveen Talari <praveen.talari@....qualcomm.com>
Subject: [PATCH v1 1/4] arm64: dts: qcom: qrb2210-rb1: Fix UART3 wakeup IRQ storm

For BT use cases, pins are configured with pull-up state in sleep state
to avoid noise. If IRQ type is configured as level high and the GPIO line
is also in a high state, it causes continuous interrupt assertions leading
to an IRQ storm when wakeup irq enables at system suspend/runtime suspend.

Switching to edge-triggered interrupt (IRQ_TYPE_EDGE_FALLING) resolves
this by only triggering on state transitions (high-to-low) rather than
maintaining sensitivity to the static level state, effectively preventing
the continuous interrupt condition and eliminating the wakeup IRQ storm.

Fixes: 9380e0a1d449 ("arm64: dts: qcom: qrb2210-rb1: add Bluetooth support")
Signed-off-by: Praveen Talari <praveen.talari@....qualcomm.com>
---
 arch/arm64/boot/dts/qcom/qrb2210-rb1.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
index e0e362b140ad..1b9ca957a94b 100644
--- a/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
+++ b/arch/arm64/boot/dts/qcom/qrb2210-rb1.dts
@@ -704,7 +704,7 @@ key_volp_n: key-volp-n-state {
 &uart3 {
 	/delete-property/ interrupts;
 	interrupts-extended = <&intc GIC_SPI 330 IRQ_TYPE_LEVEL_HIGH>,
-			      <&tlmm 11 IRQ_TYPE_LEVEL_HIGH>;
+			      <&tlmm 11 IRQ_TYPE_EDGE_FALLING>;
 	pinctrl-0 = <&uart3_default>;
 	pinctrl-1 = <&uart3_sleep>;
 	pinctrl-names = "default", "sleep";
-- 
2.34.1