linux-kernel - Re: [PATCH 1/8] usb: dwc3: fix PHY disable sequence

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Date:   Wed, 3 Aug 2022 10:33:29 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krishna Kurapati <quic_kriskura@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Pavankumar Kondeti <quic_pkondeti@...cinc.com>,
        quic_ppratap@...cinc.com, quic_vpulyala@...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 1/8] usb: dwc3: fix PHY disable sequence

On Tue, Aug 02, 2022 at 05:13:57PM +0200, Johan Hovold wrote:
> Generic PHYs must be powered-off before they can be tore down.
> 
> Similarly, suspending legacy PHYs after having powered them off makes no
> sense.
> 
> Fix the dwc3_core_exit() (e.g. called during suspend) and open-coded
> dwc3_probe() error-path sequences that got this wrong.
> 
> Note that this makes dwc3_core_exit() match the dwc3_core_init() error
> path with respect to powering off the PHYs.
> 
> Fixes: 03c1fd622f72 ("usb: dwc3: core: add phy cleanup for probe error handling")
> Fixes: c499ff71ff2a ("usb: dwc3: core: re-factor init and exit paths")
> Cc: stable@...r.kernel.org      # 4.8
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

I also wondered about this earlier, but didn't take action.

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>