USB - UVC Gadget High Bandwidth Isochronous transfer Problem

[faizel-kb]

Hello,

We have a problem in working out high bandwidth Isochronous transfers for UVC gadget. (640x480 YUV). Not able to configure the descriptors for 3x1024 packets per microframe interval. (WmaxPacketSize = 0x1400). Its working for WmaxPacketSize=1024 which sends 1024 sized packets in a uFrame interval. Below is the error we are getting when we configure for 3x1024 size

"packet size beyond hardware FIFO size1024"

When we analyzed the bare metal example -
we have seen the below comment (which says, it is not implemented)

_" @param num_usb_pkt
The num_usb_pkt parameter has different meanings for different types of
transfers.

Low bandwidth ISO/interrupt transfers – This parameter must always be ‘1u’.
This parameter represents the number of packets transferred in one (micro)
frame.

High bandwidth ISO transfers – This parameter represents the number of
packets transferred in one (Micro) frame. In this case, this parameter can
have a value of 1 2 or 3. High bandwidth ISO transfers are not yet implemented.

"_

Do we have a method to enable high bandwidth isochronuos transfers in Linux UVC gagdet (Linux UVC gadget fs) ?
@ConchuOD