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Date:   Tue, 29 Sep 2020 12:01:44 -0700
From:   Matthias Kaehlcke <mka@chromium.org>
To:     Sandeep Maheswaram <sanm@codeaurora.org>
Cc:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Felipe Balbi <balbi@kernel.org>,
        Stephen Boyd <swboyd@chromium.org>,
        Doug Anderson <dianders@chromium.org>,
        linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Manu Gautam <mgautam@codeaurora.org>
Subject: Re: [PATCH v3 3/5] usb: dwc3: qcom: Configure wakeup interrupts and
 set genpd active wakeup flag
Message-ID: <20200929190144.GD1621304@google.com>
References: <1601376452-31839-1-git-send-email-sanm@codeaurora.org>
 <1601376452-31839-4-git-send-email-sanm@codeaurora.org>
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In-Reply-To: <1601376452-31839-4-git-send-email-sanm@codeaurora.org>
Precedence: bulk

On Tue, Sep 29, 2020 at 04:17:30PM +0530, Sandeep Maheswaram wrote:
> Configure interrupts based on hs_phy_flag to avoid triggering of
> interrupts during system suspend and suspends successfully.
> Set genpd active wakeup flag for usb gdsc if wakeup capable devices
> are connected so that wake up happens without reenumeration.
> 
> Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 74 +++++++++++++++++++++++++++++++++++---------
>  1 file changed, 59 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index c703d55..b6f36bd 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -17,9 +17,11 @@
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/phy/phy.h>
> +#include <linux/pm_domain.h>
>  #include <linux/usb/of.h>
>  #include <linux/reset.h>
>  #include <linux/iopoll.h>
> +#include <linux/usb/hcd.h>
>  
>  #include "core.h"
>  
> @@ -293,19 +295,33 @@ static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom)
>  
>  static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
>  {
> +	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +
>  	if (qcom->hs_phy_irq) {
>  		disable_irq_wake(qcom->hs_phy_irq);
>  		disable_irq_nosync(qcom->hs_phy_irq);
>  	}
>  
> -	if (qcom->dp_hs_phy_irq) {
> -		disable_irq_wake(qcom->dp_hs_phy_irq);
> -		disable_irq_nosync(qcom->dp_hs_phy_irq);
> -	}
> +	if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_LS) {
> +		if (qcom->dp_hs_phy_irq) {
> +			disable_irq_wake(qcom->dp_hs_phy_irq);
> +			disable_irq_nosync(qcom->dp_hs_phy_irq);
> +		}
> +	} else if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_HS) {
> +		if (qcom->dm_hs_phy_irq) {
> +			disable_irq_wake(qcom->dm_hs_phy_irq);
> +			disable_irq_nosync(qcom->dm_hs_phy_irq);
> +		}
> +	} else {
> +		if (qcom->dp_hs_phy_irq) {
> +			disable_irq_wake(qcom->dp_hs_phy_irq);
> +			disable_irq_nosync(qcom->dp_hs_phy_irq);
> +		}
>  
> -	if (qcom->dm_hs_phy_irq) {
> -		disable_irq_wake(qcom->dm_hs_phy_irq);
> -		disable_irq_nosync(qcom->dm_hs_phy_irq);
> +		if (qcom->dm_hs_phy_irq) {
> +			disable_irq_wake(qcom->dm_hs_phy_irq);
> +			disable_irq_nosync(qcom->dm_hs_phy_irq);
> +		}

This function would benefit from a helper like this:

static void dwc3_qcon_enable_wakeup_irq(int wake_irq)
{
	if (wake_irq) {
		disable_irq_wake(wake_irq);
		disable_irq_nosync(wake_irq);
	}
}

>  	}
>  
>  	if (qcom->ss_phy_irq) {
> @@ -316,19 +332,33 @@ static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
>  
>  static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
>  {
> +	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +
>  	if (qcom->hs_phy_irq) {
>  		enable_irq(qcom->hs_phy_irq);
>  		enable_irq_wake(qcom->hs_phy_irq);
>  	}
>  
> -	if (qcom->dp_hs_phy_irq) {
> -		enable_irq(qcom->dp_hs_phy_irq);
> -		enable_irq_wake(qcom->dp_hs_phy_irq);
> -	}
> +	if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_LS) {
> +		if (qcom->dp_hs_phy_irq) {
> +			enable_irq(qcom->dp_hs_phy_irq);
> +			enable_irq_wake(qcom->dp_hs_phy_irq);
> +		}
> +	} else if (dwc->hs_phy_flags & PHY_MODE_USB_HOST_HS) {
> +		if (qcom->dm_hs_phy_irq) {
> +			enable_irq(qcom->dm_hs_phy_irq);
> +			enable_irq_wake(qcom->dm_hs_phy_irq);
> +		}
> +	} else {
> +		if (qcom->dp_hs_phy_irq) {
> +			enable_irq(qcom->dp_hs_phy_irq);
> +			enable_irq_wake(qcom->dp_hs_phy_irq);
> +		}
>  
> -	if (qcom->dm_hs_phy_irq) {
> -		enable_irq(qcom->dm_hs_phy_irq);
> -		enable_irq_wake(qcom->dm_hs_phy_irq);
> +		if (qcom->dm_hs_phy_irq) {
> +			enable_irq(qcom->dm_hs_phy_irq);
> +			enable_irq_wake(qcom->dm_hs_phy_irq);
> +		}
>  	}

Same as for _disable(), a helper would make this function more
digestable.

>  	if (qcom->ss_phy_irq) {
> @@ -341,6 +371,15 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
>  {
>  	u32 val;
>  	int i, ret;
> +	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +	struct usb_hcd  *hcd;

nit: remove extra blank

> +	struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
> +
> +	if (dwc->xhci) {
> +		hcd = platform_get_drvdata(dwc->xhci);
> +		if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
> +			genpd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
> +	}

Do this after the check for 'qcom->is_suspended' below

>  
>  	if (qcom->is_suspended)
>  		return 0;
> @@ -366,6 +405,11 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
>  {
>  	int ret;
>  	int i;
> +	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
> +	struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
> +
> +	if (dwc->xhci)
> +		genpd->flags &= ~GENPD_FLAG_ACTIVE_WAKEUP;

ditto

>  
>  	if (!qcom->is_suspended)
>  		return 0;
> @@ -764,7 +808,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto interconnect_exit;
>  
> -	device_init_wakeup(&pdev->dev, 1);
> +	device_init_wakeup(&pdev->dev, of_property_read_bool(np, "wakeup-source"));
>  	qcom->is_suspended = false;
>  	pm_runtime_set_active(dev);
>  	pm_runtime_enable(dev);
>