Populated port_base with the correct DDI_BUF_CTL register addresses
for Kaby Lake (Gen9): DDI A: 0x64000, B: 0x64100, C: 0x64200,
D: 0x64300. Previously all were None, blocking display output
on all Kaby Lake systems.
Cross-referenced with Linux 7.1 i915 display/intel_ddi.c and
IHD-OS-KBL-Vol 2c-1.17. This enables DDI buffer control,
AUX channel communication, and display mode setting for
Intel HD/UHD Graphics 6xx/7xx/8xx (Kaby Lake, Skylake,
Coffee Lake, Whiskey Lake, Comet Lake).
Red Bear OS
a8a591b44c