linux-kernel - Re: [PATCH v4 9/9] usb: dwc3: core: don't break during suspend/resume while we're dual-role

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Date:	Thu, 3 Sep 2015 17:05:48 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Roger Quadros <rogerq@...com>, balbi@...com
Cc:	tony@...mide.com, Joao.Pinto@...opsys.com,
	peter.chen@...escale.com, jun.li@...escale.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v4 9/9] usb: dwc3: core: don't break during suspend/resume
 while we're dual-role

Hello.

On 09/03/2015 05:01 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 654aebf..25891e3 100644
>>> --- a/drivers/usb/dwc3/core.c
>>> +++ b/drivers/usb/dwc3/core.c
>>> @@ -1455,18 +1455,15 @@ 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)))
>>
>>     Hm, you're not very consistent about your parens. :-)
>
> You're right. Should be
>
> if ((dwc->dr_mode == USB_DR_MODE_PERIPHERAL) ||
>      ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))

    Parens around == are useless, I'd prefer if you deleted them. But if you'd 
like to keep them, let it be so. :-)

> --
> cheers,
> -roger

MBR, Sergei

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