DMA Engine verbose debugging

configname: CONFIG_DMADEVICES_VDEBUG

Linux Kernel Configuration
└─>Device Drivers
└─>DMA Engine verbose debugging
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
This is an option for use by developers; most people should
say N here. This enables deeper (more verbose) debugging of
the DMA engine core and drivers.