On Tue, Aug 21, 2012 at 11:08 AM, Felipe Balbi [off-list ref] wrote:

Then stick to a workqueue... but could you let me know why exactly you
have to fake SET_CONFIGURATION/SET_INTERFACE requests ? Is this a
silicon bug or a silicon feature ? That's quite weird to me.

It is a silicon feature: the core will intercept SET_CONFIGURATION /
SET_INTERFACE requests, store wValue/wIndex in the appropriate
USBD_STATUS_REG field (cfg/intf/altintf), send an acknowledgement to
the host, and raise a control interrupt.

I haven't found it to be terribly helpful, but I don't know of a way
to turn it off.

I will reinstate the workqueue and submit V3.

Thanks.