AMD DC support for Southern Islands ASICs

configname: CONFIG_DRM_AMD_DC_SI

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>Display Engine Configuration
└─>AMD DC support for Southern Islands ASICs
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Choose this option to enable new AMD DC support for SI asics
by default. This includes Tahiti, Pitcairn, Cape Verde, Oland.
Hainan is not supported by AMD DC and it has no physical DCE6.