DRM Support for STMicroelectronics SoC stiH4xx Series

modulename: sti-drm.ko

and/or

sti_vtg.ko

configname: CONFIG_DRM_STI

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Device Tree and Open Firmware support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>DRM Support for STMicroelectronics SoC stiH4xx Series
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Choose this option to enable DRM on STM stiH4xx chipset

source code:
drivers/gpu/drm//sti/