drm/radeon/rv740: fix backend setup

This patch fixes occlusion queries and rendering errors
on rv740 boards. Hardcoding the backend map is not an optimal
solution, but a better fix is being worked on.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 12 insertions, 6 deletions

diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
index d9712a1023b1..fca96aa28818 100644
--- a/drivers/gpu/drm/radeon/r600_cp.c
+++ b/drivers/gpu/drm/radeon/r600_cp.c
@@ -1439,9 +1439,12 @@ static void r700_gfx_init(struct drm_device *dev,
 
         gb_tiling_config |= R600_BANK_SWAPS(1);
 
-        backend_map = r700_get_tile_pipe_to_backend_map(dev_priv->r600_max_tile_pipes,
-                                                        dev_priv->r600_max_backends,
-                                                        (0xff << dev_priv->r600_max_backends) & 0xff);
+        if ((dev_priv->flags & RADEON_FAMILY_MASK) == CHIP_RV740)
+                backend_map = 0x28;
+        else
+                backend_map = r700_get_tile_pipe_to_backend_map(dev_priv->r600_max_tile_pipes,
+                                                                dev_priv->r600_max_backends,
+                                                                (0xff << dev_priv->r600_max_backends) & 0xff);
         gb_tiling_config |= R600_BACKEND_MAP(backend_map);
 
         cc_gc_shader_pipe_config =
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 323fa6be5082..f4bb0b129a0f 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -556,9 +556,12 @@ static void rv770_gpu_init(struct radeon_device *rdev)
 
         gb_tiling_config |= BANK_SWAPS(1);
 
-        backend_map = r700_get_tile_pipe_to_backend_map(rdev->config.rv770.max_tile_pipes,
-                                                        rdev->config.rv770.max_backends,
-                                                        (0xff << rdev->config.rv770.max_backends) & 0xff);
+        if (rdev->family == CHIP_RV740)
+                backend_map = 0x28;
+        else
+                backend_map = r700_get_tile_pipe_to_backend_map(rdev->config.rv770.max_tile_pipes,
+                                                                rdev->config.rv770.max_backends,
+                                                                (0xff << rdev->config.rv770.max_backends) & 0xff);
         gb_tiling_config |= BACKEND_MAP(backend_map);
 
         cc_gc_shader_pipe_config =