diff options
| author | Roger Quadros | 2017-03-08 16:05:44 +0200 |
|---|---|---|
| committer | Felipe Balbi | 2017-03-22 11:21:09 +0200 |
| commit | 16bb05d98c904a4f6c5ce7e2d992299f794acbf2 (patch) | |
| tree | d9e261e28cea84e01639ec82cb5df06e6402b18c /drivers/usb | |
| parent | 09424c50b7dff40cb30011c09114404a4656e023 (diff) | |
usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed
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>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/function/f_uvc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index c7689d05356c..f8a1881609a2 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -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. * |