Replaced three TODO comments with proper documentation:
1. fetch_framebuffer stride: documented that stride=64*stride_64 is
correct for linear (untiled) planes. Tiled memory (X-tiled GTT)
is for the 3D rendering path, not yet implemented.
2. fetch_framebuffer bits-per-pixel: documented ARGB8888 = 4 bytes
per pixel, surface aligned to 4K pages for GTT reservation.
3. set_framebuffer PLANE_CTL: documented all register bits — pixel
format (ARGB8888), rotation (0), tiling (linear), alpha (none).
Future 3D path will configure rotation and X-tiled memory.
All three were 'TODO: ...' comments; the implementations are correct
for the display-only compositor use case.
Red Bear OS
0eae5a8420