tree 4406950a9497d0683687521c760430a02d907663
parent 51375ad75a99d395f3843e46783c0743b5fea29b
author Nico Huber <nico.huber@secunet.com> 1503660548 +0200
committer Nico Huber <nico.h@gmx.de> 1513088756 +0000

gma registers: Add procedures to set fence registers

Through fence registers, we can tell the hardware which parts of the
aperture cover tiled framebuffers. Only legacy X and Y tiling is sup-
ported. According to `i915_reg.h` there are 16 fence registers from
G4x on and 32 from Ivy Bridge on (this only partially matches docu-
mentation: Haswell has 16 regs documented and the fence registers
were not documented at all before).

Change-Id: I02edc99b315e24dc175c6f93aff627e59cb1ff0b
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/22708
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: Nico Huber <nico.h@gmx.de>