drivers/gpu/radeon: Add MSPOS regs to safe list.

Permits MSAA and D3D-style rasterization.

[airlied: add rs600]

Signed-off-by: Corbin Simpson <MostAwesomeDude@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/reg_srcs/r420 b/drivers/gpu/drm/radeon/reg_srcs/r420
index 989f7a0..e958980 100644
--- a/drivers/gpu/drm/radeon/reg_srcs/r420
+++ b/drivers/gpu/drm/radeon/reg_srcs/r420
@@ -125,6 +125,8 @@
 0x4000 GB_VAP_RASTER_VTX_FMT_0
 0x4004 GB_VAP_RASTER_VTX_FMT_1
 0x4008 GB_ENABLE
+0x4010 GB_MSPOS0
+0x4014 GB_MSPOS1
 0x401C GB_SELECT
 0x4020 GB_AA_CONFIG
 0x4024 GB_FIFO_SIZE