This is a note to let you know that I've just added the patch titled usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed to the 4.4-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-gadget-f_uvc-sanity-check-wmaxpacketsize-for-superspeed.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Thu Dec 21 10:35:49 CET 2017 From: Roger Quadros <rogerq@xxxxxx> Date: Wed, 8 Mar 2017 16:05:44 +0200 Subject: usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed From: Roger Quadros <rogerq@xxxxxx> [ Upstream commit 16bb05d98c904a4f6c5ce7e2d992299f794acbf2 ] As per USB3.0 Specification "Table 9-20. Standard Endpoint Descriptor", for interrupt and isochronous endpoints, wMaxPacketSize must be set to 1024 if the endpoint defines bMaxBurst to be greater than zero. Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Signed-off-by: Roger Quadros <rogerq@xxxxxx> Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/gadget/function/f_uvc.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -594,6 +594,14 @@ uvc_function_bind(struct usb_configurati opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U); opts->streaming_maxburst = min(opts->streaming_maxburst, 15U); + /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */ + if (opts->streaming_maxburst && + (opts->streaming_maxpacket % 1024) != 0) { + opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024); + INFO(cdev, "overriding streaming_maxpacket to %d\n", + opts->streaming_maxpacket); + } + /* Fill in the FS/HS/SS Video Streaming specific descriptors from the * module parameters. * Patches currently in stable-queue which might be from rogerq@xxxxxx are queue-4.4/usb-gadget-f_uvc-sanity-check-wmaxpacketsize-for-superspeed.patch