On Thu, 21 Aug 2003, David Brownell wrote:
If you want to try stalling in the completion handler for the OUT data, some hardware might allow that; net2280 does.
It turns out that's the best way to report certain errors, like invalid-length command. Does the PXA250 driver also support it?
It doesn't yet implement control-OUT unless the data stage is empty ... patches accepted! No drivers are yet relying on that functionality. :)
But as far as I've been able to tell, the only synchronization point supported by the PXA2xx UDC is after the SETUP packet, before the DATA stage begins. (And maybe not even there for set_config/set_interface requests -- except for the PXA 255.)
Once the data stage starts, the status stage will succeed as soon as the host asks it to. It's not a friendly chip for anyone wanting precise handling of control transfers.
- Dave
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