drm/radeon: fixup tiling group size and backendmap on r6xx-r9xx (v4)

Tiling group size is always 256bits on r6xx/r7xx/r8xx/9xx. Also fix and
simplify render backend map. This now properly sets up the backend map
on r6xx-9xx which should improve 3D performance.

Vadim benchmarked also:
Some benchmarks on juniper (5750), fullscreen 1920x1080,
first result - kernel 3.4.0+ (fb21affa), second - with these patches:

Lightsmark:   91 fps => 123 fps    +35%
Doom3:        74 fps => 101 fps    +36%

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600d.h b/drivers/gpu/drm/radeon/r600d.h
index 15bd3b216243..a0dbf1fe6a40 100644
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -219,6 +219,8 @@
 #define         BACKEND_MAP(x)                                  ((x) << 16)
 
 #define GB_TILING_CONFIG                                0x98F0
+#define     PIPE_TILING__SHIFT              1
+#define     PIPE_TILING__MASK               0x0000000e
 
 #define GC_USER_SHADER_PIPE_CONFIG                      0x8954
 #define         INACTIVE_QD_PIPES(x)                            ((x) << 8)