diff options
| author | Roger Quadros <rogerq@ti.com> | 2017-03-08 16:05:44 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-25 14:20:06 +0100 |
| commit | af2dec74ed463bbf8194272d6ea3b003cd9934ba (patch) | |
| tree | d090b486b2f71714a032febba874a9691c568c69 /drivers | |
| parent | 9829550de5aaaabb2c3490fbdd3f0a71fa123cf7 (diff) | |
usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed
[ Upstream commit 16bb05d98c904a4f6c5ce7e2d992299f794acbf2 ]
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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -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 f4a0b25d1810..5e679fec4e33 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -612,6 +612,14 @@ 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. * |