linux-kernel - [PATCH 1/2] usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval

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Date:   Wed, 8 Mar 2017 16:05:43 +0200
From:   Roger Quadros <rogerq@...com>
To:     <laurent.pinchart@...asonboard.com>, <balbi@...nel.org>
CC:     <b-liu@...com>, <nsekhar@...com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>,
        <stable@...r.kernel.org>
Subject: [PATCH 1/2] 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@...r.kernel.org
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/gadget/function/f_uvc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 29b41b5..c7689d0 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);
-- 
2.7.4