linux-kernel - Re: [PATCH v7 5/5] usb: dwc3: qcom: Keep power domain on to support wakeup

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Message-ID: <87lf92k9ms.fsf@kernel.org>
Date:   Wed, 28 Apr 2021 13:04:43 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Sandeep Maheswaram <sanm@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Manu Gautam <mgautam@...eaurora.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>
Subject: Re: [PATCH v7 5/5] usb: dwc3: qcom: Keep power domain on to support
 wakeup


Hi,

Sandeep Maheswaram <sanm@...eaurora.org> writes:
> If wakeup capable devices are connected to the controller (directly
> or through hubs) at suspend time keep the power domain on in order
> to support wakeup from these devices.
>
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 82125bc..1e220af 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"
>  
> @@ -354,10 +356,19 @@ 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;
> +	struct generic_pm_domain *genpd = pd_to_genpd(qcom->dev->pm_domain);
>  
>  	if (qcom->is_suspended)
>  		return 0;
>  
> +	if (dwc->xhci) {
> +		hcd = platform_get_drvdata(dwc->xhci);
> +		if (usb_wakeup_enabled_descendants(hcd->self.root_hub))
> +			genpd->flags |= GENPD_FLAG_ACTIVE_WAKEUP;
> +	}

wow, you really need to find a way to do these things generically
instead of bypassing a bunch of layers and access stuff $this doesn't
directly own.

I'm gonna say 'no' to this, sorry. It looks like xhci should, directly,
learn about much of this instead of hiding it 3-layers deep into the
dwc3 glue layer for your specific SoC.

-- 
balbi

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