When I test the uvc gadget function, I find that the uvc
gadget can only transfer the first frame image and then
stop unexpectedly.
Without this patch, the isochronous endpoints doesn't wait
for a XferNotReady event to start the next frame image, and
fail to transfer data. In this case, we will get an endpoint
event DWC3_DEPEVT_XFERINPROGRESS and the event status is
DEPEVT_STATUS_MISSED_ISOC, and the original code try to
issue an EndTransfer command if the started_list is empty.
However, the started_list is never empty, so it doesn't issue
an EndTransfer command and not XferNotReady event happens.
To fix this problem, this patch firstly checks if the event
status is DEPEVT_STATUS_MISSED_ISOC and then unmap the isoc
request and move the request to the pending list. Then it
issue an EndTransfer command if the started_list is empty.
After the EndTransfer is completed, we will get a XferNotReady
event and it can start the isoc requests again.
Change-Id: Ieac3ca9a177bc7599b29ae30bee243e47b3ba7c9
Signed-off-by: William Wu <william.wu@rock-chips.com>
cb3db5f6a5