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usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed

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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@ideasonboard.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Roger Quadros 2017-03-08 16:05:44 +02:00 committed by Felipe Balbi
parent 09424c50b7
commit 16bb05d98c
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/gadget/function/f_uvc.c
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@ -594,6 +594,14 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
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.
*