uhci: Increase bulk transfer STACKTDS to 16

Increase the number of simultaneous transfer descriptors that the
driver will build for uhci.  The old value of 4 was a leftover from
when SeaBIOS had a tiny 512 byte extra stack - now that there is a 2K
extra stack there is plenty of space for additional descriptors.
Using a value of 16 should allow for an entire 1ms frame of bulk
transfer content to be setup in advance (assuming the max packet size
is 64 bytes).

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
1 file changed
tree: 3841e42cd28532b3d605096b24831bccc3aa3745
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