linux-kernel - Re: [PATCH] usb: dwc3: qcom: Honor wakeup enabled/disabled state

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Date:   Tue, 15 Sep 2020 18:50:32 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <agross@...nel.org>, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Douglas Anderson <dianders@...omium.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: qcom: Honor wakeup enabled/disabled state

On Tue 15 Sep 14:31 CDT 2020, Matthias Kaehlcke wrote:

> The dwc3-qcom currently enables wakeup interrupts unconditionally
> when suspending, however this should not be done when wakeup is
> disabled (e.g. through the sysfs attribute power/wakeup). Only
> enable wakeup interrupts when device_may_wakeup() returns true.
> 
> Fixes: a4333c3a6ba9 ("usb: dwc3: Add Qualcomm DWC3 glue driver")
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> 
>  drivers/usb/dwc3/dwc3-qcom.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index e1e78e9824b1..56d14c09506d 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -251,8 +251,10 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
>  	for (i = qcom->num_clocks - 1; i >= 0; i--)
>  		clk_disable_unprepare(qcom->clks[i]);
>  
> +	if (device_may_wakeup(qcom->dev))
> +		dwc3_qcom_enable_interrupts(qcom);
> +
>  	qcom->is_suspended = true;
> -	dwc3_qcom_enable_interrupts(qcom);
>  
>  	return 0;
>  }
> @@ -265,7 +267,8 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
>  	if (!qcom->is_suspended)
>  		return 0;
>  
> -	dwc3_qcom_disable_interrupts(qcom);
> +	if (device_may_wakeup(qcom->dev))
> +		dwc3_qcom_disable_interrupts(qcom);
>  
>  	for (i = 0; i < qcom->num_clocks; i++) {
>  		ret = clk_prepare_enable(qcom->clks[i]);
> -- 
> 2.28.0.618.gf4bc123cb7-goog
>