From: Roger Quadros Date: Wed, 8 Mar 2017 14:05:43 +0000 (+0200) Subject: usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=09424c50b7dff40cb30011c09114404a4656e023;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval 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. Cc: stable@vger.kernel.org Reviewed-by: Laurent Pinchart Signed-off-by: Roger Quadros Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 29b41b5dee04..c7689d05356c 100644 --- 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_configuration *c, struct usb_function *f) 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);