This is a note to let you know that I've just added the patch titled
usb: dwc3: gadget: Don't set IMI for no_interrupt
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc3-gadget-don-t-set-imi-for-no_interrupt.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 308c316d16cbad99bb834767382baa693ac42169 Mon Sep 17 00:00:00 2001
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Date: Tue, 25 Oct 2022 15:10:20 -0700
Subject: usb: dwc3: gadget: Don't set IMI for no_interrupt
From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Reviewed-by: Jeff Vanhoof <jdv1029@xxxxxxxxx>
Tested-by: Jeff Vanhoof <jdv1029@xxxxxxxxx>
Link: https://lore.kernel.org/r/ced336c84434571340c07994e3667a0ee284fefe.1666735451.git.Thinh.Nguyen@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1263,8 +1263,8 @@ static void dwc3_prepare_one_trb(struct
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:
Patches currently in stable-queue which might be from Thinh.Nguyen@xxxxxxxxxxxx are
queue-5.15/usb-dwc3-gadget-don-t-set-imi-for-no_interrupt.patch
queue-5.15/usb-dwc3-gadget-stop-processing-more-requests-on-imi.patch
