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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>