linux-kernel - Re: [PATCH 2/3] USB: dwc3: qcom: fix wakeup after probe deferral

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Message-ID: <ZVzANwndkuzhBOiO@hovoldconsulting.com>
Date:   Tue, 21 Nov 2023 15:35:35 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
Cc:     Andrew Halaney <ahalaney@...hat.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 2/3] USB: dwc3: qcom: fix wakeup after probe deferral

On Tue, Nov 21, 2023 at 07:38:18PM +0530, Krishna Kurapati PSSNV wrote:
> >>    Just one query. Even if it wakes up after closing the lid and removing
> >> the mouse, wouldn't pm suspend be triggered again later by the system
> >> once it sees that usb is also good to be suspended again ? I presume a
> >> laptop form factor would be having this facility of re-trigerring
> >> suspend. Let me know if this is not the case.
> > 
> > No, we generally don't use opportunistic suspend (e.g. unlike android)
> > so the laptop will not suspend again.
> > 
> > So this is an actual bug affecting, for example, the Lenovo ThinkPad
> > X13s.

> Thanks for the clarification. I was thinking in android perspective 
> only. But if we don't wake up the system upon disconnect, wouldn't the 
> controller still be under the assumption that device is connected when 
> it is actually not and only realise this when we resume later ?

Correct.

Johan