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SSP in MASTER_BIDIR mode




Hello:

When I configure SSP in MASTER_BIDIR mode my program runs very, very,
slowly 
and CLOCK_GATED does not work (master output mode works ok).

Here is part of my program:
devspi = open ("/dev/syncser0", O_RDWR | O_SYNC | O_NONBLOCK);    
ioctl (devspi, SSP_MODE, MASTER_BIDIR);  
ioctl (devspi, SSP_FRAME_SYNC, FLOW_CONTROL_DISABLE);    
ioctl (devspi, SSP_FRAME_SYNC, CLOCK_GATED);      

Anybody knows why or have any clue?

Regards,
Carlos