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

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Message-ID: <fbd241d2-d383-4476-8e2e-0f9dd9dae484@oss.qualcomm.com>
Date: Mon, 10 Nov 2025 12:10:48 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Praveen Talari <praveen.talari@....qualcomm.com>,
        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: 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
Subject: Re: [PATCH v1 1/4] arm64: dts: qcom: qrb2210-rb1: Fix UART3 wakeup
 IRQ storm

On 11/10/25 11:10 AM, Praveen Talari wrote:
> 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>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad