linux-kernel - Re: [PATCH v3 9/9] usb: dwc3: core: don't break during suspend/resume while we're dual-role

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Message-ID: <559D217B.5000500@cogentembedded.com>
Date:	Wed, 8 Jul 2015 16:11:23 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Roger Quadros <rogerq@...com>, balbi@...com
Cc:	tony@...mide.com, Joao.Pinto@...opsys.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v3 9/9] usb: dwc3: core: don't break during suspend/resume
 while we're dual-role

Hello.

On 7/8/2015 1:37 PM, Roger Quadros wrote:

> We can't rely just on dr_mode to decide if we're in host or gadget
> mode when we're configured as otg/dual-role. So while dr_mode is
> OTG, we find out from  the otg state machine if we're in host
> or gadget mode and take the necessary actions during suspend/resume.

> Also make sure that we disable OTG irq and events during system suspend
> so that we don't lockup the system during system suspend/resume.

> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>   drivers/usb/dwc3/core.c | 27 +++++++++------------------
>   1 file changed, 9 insertions(+), 18 deletions(-)

> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index e3c094d..3784287 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1444,18 +1444,15 @@ static int dwc3_suspend(struct device *dev)
>   		dwc->octl = dwc3_readl(dwc->regs, DWC3_OCTL);
>   		dwc->oevt = dwc3_readl(dwc->regs, DWC3_OEVT);
>   		dwc->oevten = dwc3_readl(dwc->regs, DWC3_OEVTEN);
> +		dwc3_writel(dwc->regs, DWC3_OEVTEN, 0);
> +		disable_irq(dwc->otg_irq);
>   	}
>
> -	switch (dwc->dr_mode) {
> -	case USB_DR_MODE_PERIPHERAL:
> -	case USB_DR_MODE_OTG:
> +	if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL ||
> +	    ((dwc->dr_mode == USB_DR_MODE_OTG) && dwc->fsm->protocol == PROTO_GADGET))

    Hum, enclosing the first == op into parens and not doing it to the second 
== op doesn't look very consistent... :-)

[...]
> @@ -1495,18 +1492,12 @@ static int dwc3_resume(struct device *dev)
>   		dwc3_writel(dwc->regs, DWC3_OCTL, dwc->octl);
>   		dwc3_writel(dwc->regs, DWC3_OEVT, dwc->oevt);
>   		dwc3_writel(dwc->regs, DWC3_OEVTEN, dwc->oevten);
> +		enable_irq(dwc->otg_irq);
>   	}
>
> -	switch (dwc->dr_mode) {
> -	case USB_DR_MODE_PERIPHERAL:
> -	case USB_DR_MODE_OTG:
> +	if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL ||
> +	    ((dwc->dr_mode == USB_DR_MODE_OTG) && dwc->fsm->protocol == PROTO_GADGET))

    Same here...

[...]

WBR, Sergei

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