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H A Dehci-hcd.c41b1f0ac2e4c1d54807f90ae9aa2f2fad22a5151 Mon Apr 09 02:13:00 UTC 2012 Marek Vasut <marex@denx.de> USB: Document the QH and qTD antics in EHCI-HCD

The construction of QH and qTD lists in ehci_submit_async() call is cryptic
business, add at least a bit of comments so if someone is reading it, he can at
least reference the intel ehci manual (ehci-r10.pdf).

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>