linux-kernel - Re: [PATCH v2 8/9] usb: dwc3: qcom: fix wakeup implementation

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Message-ID: <20220806145719.GG14384@thinkpad>
Date:   Sat, 6 Aug 2022 20:27:19 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.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>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krishna Kurapati <quic_kriskura@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...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
Subject: Re: [PATCH v2 8/9] usb: dwc3: qcom: fix wakeup implementation

On Thu, Aug 04, 2022 at 05:10:00PM +0200, Johan Hovold wrote:
> It is the Qualcomm glue wakeup interrupts that may be able to wake the
> system from suspend and this can now be described in the devicetree.
> 
> Move the wakeup-source property handling over from the core driver and
> instead propagate the capability setting to the core device during
> probe.
> 

The "wakeup-source" property is still defined in the DWC binding, so other
platform glue drivers are free to assume that wakeup capability is handled by
the DWC driver.

> This is needed as there is currently no way for the core driver to query
> the wakeup setting of the glue device, but it is the core driver that
> manages the PHY power state during suspend.
> 
> Also don't leave the PHYs enabled when system wakeup has been disabled
> through sysfs.
> 

Can you please elaborate on how this is handled in the patch?

Thanks,
Mani

> Fixes: 649f5c842ba3 ("usb: dwc3: core: Host wake up support from system suspend")
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  drivers/usb/dwc3/core.c      | 5 ++---
>  drivers/usb/dwc3/dwc3-qcom.c | 6 +++++-
>  2 files changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 16d1f328775f..8c8e32651473 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1822,7 +1822,6 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, dwc);
>  	dwc3_cache_hwparams(dwc);
> -	device_init_wakeup(&pdev->dev, of_property_read_bool(dev->of_node, "wakeup-source"));
>  
>  	spin_lock_init(&dwc->lock);
>  	mutex_init(&dwc->mutex);
> @@ -1984,7 +1983,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
>  		dwc3_core_exit(dwc);
>  		break;
>  	case DWC3_GCTL_PRTCAP_HOST:
> -		if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
> +		if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {
>  			dwc3_core_exit(dwc);
>  			break;
>  		}
> @@ -2045,7 +2044,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
>  		spin_unlock_irqrestore(&dwc->lock, flags);
>  		break;
>  	case DWC3_GCTL_PRTCAP_HOST:
> -		if (!PMSG_IS_AUTO(msg) && !device_can_wakeup(dwc->dev)) {
> +		if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {
>  			ret = dwc3_core_init_for_resume(dwc);
>  			if (ret)
>  				return ret;
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 6ae0b7fc4e2c..b05f67d206d2 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -786,6 +786,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	struct resource		*res, *parent_res = NULL;
>  	int			ret, i;
>  	bool			ignore_pipe_clk;
> +	bool			wakeup_source;
>  
>  	qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
>  	if (!qcom)
> @@ -901,7 +902,10 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto interconnect_exit;
>  
> -	device_init_wakeup(&pdev->dev, 1);
> +	wakeup_source = of_property_read_bool(dev->of_node, "wakeup-source");
> +	device_init_wakeup(&pdev->dev, wakeup_source);
> +	device_init_wakeup(&qcom->dwc3->dev, wakeup_source);
> +
>  	qcom->is_suspended = false;
>  	pm_runtime_set_active(dev);
>  	pm_runtime_enable(dev);
> -- 
> 2.35.1
> 

-- 
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