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

Roger Quadros
2015-09-03T14:02:37Z

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On 02/09/15 17:48, Felipe Balbi wrote:
> On Wed, Sep 02, 2015 at 05:24:24PM +0300, 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@ti.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);
>
> you don't need disable_irq() here. In fact, it causes problems since
> you're calling it with IRQs disabled.

OK. will remove it.

>
>> }
>>
>> - 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)))
>> dwc3_gadget_suspend(dwc);
>> - /* FALLTHROUGH */
>> - case USB_DR_MODE_HOST:
>> - default:
>> - dwc3_event_buffers_cleanup(dwc);
>> - break;
>> - }
>> +
>> + dwc3_event_buffers_cleanup(dwc);
>>
>> dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
>> spin_unlock_irqrestore(&dwc->lock, flags);
>> @@ -1506,18 +1503,12 @@ 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)))
>> dwc3_gadget_resume(dwc);
>> - /* FALLTHROUGH */
>> - case USB_DR_MODE_HOST:
>> - default:
>> - /* do nothing */
>> - break;
>> - }
>>
>> spin_unlock_irqrestore(&dwc->lock, flags);
>>
>> --
>> 2.1.4
>>
>

- --
cheers,
- -roger
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