tree 56f16face1b92caae14e04c96f07cb114c66567c
parent 6a3d1aef6b580f62cec826f1dff10ea9e900ca07
author Pratyush Anand <pratyush.anand@st.com> 1358159372 +0530
committer Jay Chokshi <jchokshi@codeaurora.org> 1360867739 -0800

usb: dwc3: gadget: fix missed isoc

There are two reasons to generate missed isoc.

1. when the host does not poll for all the data.
2. because of application-side delays that prevent all the data from
being transferred in programmed microframe.

Current code was able to handle first case only.  This patch handles
scenario 2 as well.Scenario 2 sometime may occur with complex gadget
application, however it can be easily reproduced for testing purpose as
follows:

a. use isoc binterval as 1 in f_sourcesink.
b. use pattern=0
c. introduce a delay of 150us deliberately in source_sink_complete, so
that after few frames it lands into scenario 2.
d. now run testusb 16 (isoc in  test). You will notice that if this
patch is not applied then isoc transfer is not able to recover after
first missed.

Current patch's approach is as under:

If missed isoc occurs and there is no request queued then issue END
TRANSFER, so that core generates next xfernotready and we will issue a
fresh START TRANSFER.
If there are still queued request then wait, do not issue either END or
UPDATE TRANSFER, just attach next request in request_list during giveback.
If any future queued request is successfully transferred then we will issue
UPDATE TRANSFER for all request in the request_list.

Change-Id: I993bb609662745c9a97a1afcc5ee564ff95908d8
Cc: <stable@vger.kernel.org> # v3.6 v3.7 v3.8
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>