usb: dwc3: gadget: Don't set IMI for no_interrupt

The gadget driver may have a certain expectation of how the request
completion flow should be from to its configuration. Make sure the
controller driver respect that. That is, don't set IMI (Interrupt on
Missed Isoc) when usb_request->no_interrupt is set. Also, the driver
should only set IMI to the last TRB of a chain.

Fixes: 72246da ("usb: Introduce DesignWare USB3 DRD Driver")
Cc: [email protected]
Signed-off-by: Thinh Nguyen <[email protected]>
Reviewed-by: Jeff Vanhoof <[email protected]>
Tested-by: Jeff Vanhoof <[email protected]>
Link: https://lore.kernel.org/r/ced336c84434571340c07994e3667a0ee284fefe.1666735451.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Thinh Nguyen

drivers/usb/dwc3/gadget.c

@@ -1292,8 +1292,8 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 			trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
 		}
 
-		/* always enable Interrupt on Missed ISOC */
-		trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
+		if (!no_interrupt && !chain)
+			trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
 		break;
 
 	case USB_ENDPOINT_XFER_BULK: