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7efea86c28
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. 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> |
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| .. | ||
| core.c | ||
| core.h | ||
| debug.h | ||
| debugfs.c | ||
| dwc3-exynos.c | ||
| dwc3-omap.c | ||
| dwc3-pci.c | ||
| ep0.c | ||
| gadget.c | ||
| gadget.h | ||
| host.c | ||
| io.h | ||
| Kconfig | ||
| Makefile | ||