From: Thinh Nguyen Thinh.Nguyen@synopsys.com
commit 308c316d16cbad99bb834767382baa693ac42169 upstream.
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: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver") Cc: stable@vger.kernel.org Signed-off-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Reviewed-by: Jeff Vanhoof jdv1029@gmail.com Tested-by: Jeff Vanhoof jdv1029@gmail.com Link: https://lore.kernel.org/r/ced336c84434571340c07994e3667a0ee284fefe.166673545... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/gadget.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -981,8 +981,8 @@ static void __dwc3_prepare_one_trb(struc 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: