linux-kernel - Re: [PATCH v4 1/5] usb: dwc3: core: Host wake up support from system suspend

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Date:   Sat, 28 Nov 2020 08:01:31 +0530
From:   mgautam@...eaurora.org
To:     Sandeep Maheswaram <sanm@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/5] usb: dwc3: core: Host wake up support from system
 suspend

Hi,


On 2020-10-28 02:07, Sandeep Maheswaram wrote:
> Avoiding phy powerdown in host mode so that it can be woken up by 
> devices.
> Added hs_phy_mode flag to check connection status and set phy mode
> and configure interrupts.
> 
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> ---
>  drivers/usb/dwc3/core.c | 14 +++-----------
>  drivers/usb/dwc3/core.h |  2 ++
>  2 files changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index bdf0925..0e4bc1e 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1672,10 +1672,6 @@ 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)) {
> -			dwc3_core_exit(dwc);
> -			break;
> -		}


This could be a problem for platforms that don't support runtime_suspend
and rely on dwc3_core_exit to power-down PHY.
IMO you can continue to do dwc3_core_exit() if runtime_pm isn't enabled
for the device.

> 
>  		/* Let controller to suspend HSPHY before PHY driver suspends */
>  		if (dwc->dis_u2_susphy_quirk ||
> @@ -1733,13 +1729,9 @@ 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)) {
> -			ret = dwc3_core_init_for_resume(dwc);
> -			if (ret)
> -				return ret;
> -			dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
> -			break;
> -		}
> +
> +		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
> +
>  		/* Restore GUSB2PHYCFG bits that were modified in suspend */
>  		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
>  		if (dwc->dis_u2_susphy_quirk)
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 74323b1..da63d4a3 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1101,6 +1101,8 @@ struct dwc3 {
> 
>  	bool			phys_ready;
> 
> +	unsigned int            hs_phy_mode;
> +

This change should instead be part of the other patch ?
"usb: dwc3: host: Add suspend_quirk for dwc3 host"


>  	struct ulpi		*ulpi;
>  	bool			ulpi_ready;