tree d9e21bb029ecfd41e7d35478dcf3ac4f1df65bbe
parent e13a70423152cf88be13d35f28b911d4b22259f6
author Stephen Warren <swarren@nvidia.com> 1398383560 -0600
committer Marek Vasut <marex@denx.de> 1398846658 +0200

usb: ums: use only 1 buffer for CI_UDC

ci_udc.c allocates only a single buffer for each endpoint, which
ci_ep_alloc_request() returns as a hard-coded value rather than
dynamically allocating. Consequently, storage_common.c must limit
itself to using a single buffer at a time. Add a special case
to the definition of FSG_NUM_BUFFERS for this.

Another option would be to fix ci_ep_alloc_request() to dynamically
allocate the buffers like some/all(?) other device mode drivers do.
However, I don't think that ci_ep_queue() supports queueing up
multiple buffers either yet, and I'm not familiar enough with the
controller yet to implement that. As such, any attempt to use multiple
buffers simply results in data corruption and other errors.

Signed-off-by: Stephen Warren <swarren@nvidia.com>