Debug support

configname: CONFIG_FB_OMAP2_DSS_DEBUG

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Frame buffer Devices
└─>Device Tree and Open Firmware support
└─>OMAP2+ frame buffer support
└─>Debug support
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This enables printing of debug messages. Alternatively, debug messages
can also be enabled by setting CONFIG_DYNAMIC_DEBUG and then setting
appropriate flags in <debugfs>/dynamic_debug/control.