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>
diff --git a/common/hw-gfx.ads b/common/hw-gfx.ads
index ae19235..c5d9631 100644
--- a/common/hw-gfx.ads
+++ b/common/hw-gfx.ads
@@ -28,6 +28,7 @@
subtype BPC_Type is Int64 range Auto_BPC .. 16;
type Tiling_Type is (Linear, X_Tiled, Y_Tiled);
+ subtype XY_Tiling is Tiling_Type range X_Tiled .. Y_Tiled;
type Framebuffer_Type is
record