The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
308c316d16cb ("usb: dwc3: gadget: Don't set IMI for no_interrupt") 0a695d4c75ff ("usb: dwc3: gadget: never ever kill the machine") 6b9018d4c1e5 ("usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 308c316d16cbad99bb834767382baa693ac42169 Mon Sep 17 00:00:00 2001 From: Thinh Nguyen Thinh.Nguyen@synopsys.com Date: Tue, 25 Oct 2022 15:10:20 -0700 Subject: [PATCH] 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: 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
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 230b3c660054..5fe2d136dff5 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/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: