tree e331ac757e54adeee16b8c9c42c4c3332a00e27a
parent e7ac6ebddc771fb7262c5f15decd617deea1bb50
author Nico Huber <nico.h@gmx.de> 1503578646 +0200
committer Nico Huber <nico.h@gmx.de> 1513087483 +0000

Add Tiling setting to Framebuffer

Beside linear framebuffers, we can, on Intel hardware, easily support X
and Y tiled framebuffers too. If we access the framebuffer through the
aperture window, we can let the hardware handle the tiling.

Tiling generally divides the framebuffer into rectangular pieces of
fixed size where each piece, or tile, is represented by one page of
memory. Even inside one tile, the pixels are not always ordered linearly
but either in a row-major (aka. X tiled) or column-major (aka. Y tiled)
manner.

Change-Id: I3e6f93caa8f2485a5792d72cfe2e8b3902add7a3
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22707
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: Stefan Reinauer <stefan.reinauer@coreboot.org>