This is a note to let you know that I've just added the patch titled usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval 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-fix-superspeed-companion-descriptor-s-wbytesperinterval.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 09424c50b7dff40cb30011c09114404a4656e023 Mon Sep 17 00:00:00 2001 From: Roger Quadros <rogerq@xxxxxx> Date: Wed, 8 Mar 2017 16:05:43 +0200 Subject: usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval From: Roger Quadros <rogerq@xxxxxx> commit 09424c50b7dff40cb30011c09114404a4656e023 upstream. The streaming_maxburst module parameter is 0 offset (0..15) so we must add 1 while using it for wBytesPerInterval calculation for the SuperSpeed companion descriptor. Without this host uvcvideo driver will always see the wrong wBytesPerInterval for SuperSpeed uvc gadget and may not find a suitable video interface endpoint. e.g. for streaming_maxburst = 0 case it will always fail as wBytePerInterval was evaluating to 0. 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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/gadget/function/f_uvc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -625,7 +625,7 @@ uvc_function_bind(struct usb_configurati uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst; uvc_ss_streaming_comp.wBytesPerInterval = cpu_to_le16(max_packet_size * max_packet_mult * - opts->streaming_maxburst); + (opts->streaming_maxburst + 1)); /* Allocate endpoints. */ ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep); Patches currently in stable-queue which might be from rogerq@xxxxxx are queue-4.4/usb-gadget-f_uvc-fix-superspeed-companion-descriptor-s-wbytesperinterval.patch