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authorRoger Quadros <rogerq@ti.com>2017-03-08 16:05:43 +0200
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-03-22 11:21:09 +0200
commit09424c50b7dff40cb30011c09114404a4656e023 (patch)
treee48ed2d80dce86f37cc771e359c1ea352eae22e6 /drivers/usb
parent74098c4ac782afd71b35ac56f9536ae2f5cd7da7 (diff)
downloadlinux-09424c50b7dff40cb30011c09114404a4656e023.tar.bz2
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 <laurent.pinchart@ideasonboard.com> Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/function/f_uvc.c2
1 files changed, 1 insertions, 1 deletions
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);