usb: dwc3: workaround: bogus hibernation events (e1dadd3b) · Commits · 戴 / test

drivers/usb/dwc3/gadget.c

+31 −0

Original line number	Diff line number	Diff line
		@@ -2378,6 +2378,30 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
		dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
		}

		static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
		unsigned int evtinfo)
		{
		unsigned int is_ss = evtinfo & BIT(4);

		/**
		* WORKAROUND: DWC3 revison 2.20a with hibernation support
		* have a known issue which can cause USB CV TD.9.23 to fail
		* randomly.
		*
		* Because of this issue, core could generate bogus hibernation
		* events which SW needs to ignore.
		*
		* Refers to:
		*
		* STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
		* Device Fallback from SuperSpeed
		*/
		if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
		return;

		/* enter hibernation here */
		}

		static void dwc3_gadget_interrupt(struct dwc3 *dwc,
		const struct dwc3_event_devt *event)
		{
		@@ -2394,6 +2418,13 @@ static void dwc3_gadget_interrupt(struct dwc3 *dwc,
		case DWC3_DEVICE_EVENT_WAKEUP:
		dwc3_gadget_wakeup_interrupt(dwc);
		break;
		case DWC3_DEVICE_EVENT_HIBER_REQ:
		if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
		"unexpected hibernation event\n"))
		break;

		dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
		break;
		case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
		dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
		break;