because buffers get unconditionally initialised by cpu writing.
Signed-off-by: Topi Pohjolainen <topi.pohjolai...@intel.com>
---
src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 9462e98..20b57d1 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -1519,7 +1519,12 @@ intel_miptree_alloc_mcs(struct brw_context *brw,
assert(temp_mcs_surf.size &&
(temp_mcs_surf.size % temp_mcs_surf.row_pitch == 0));
- const uint32_t alloc_flags = BO_ALLOC_FOR_RENDER;
+ /* Buffer needs to be initialised requiring the buffer to be immediately
+ * mapped to cpu space for writing. Therefore do not use the gpu access
+ * flag which can cause an unnecessary delay if the backing pages happened
+ * to be just used by the GPU.
+ */
+ const uint32_t alloc_flags = 0;
mt->mcs_buf = intel_alloc_aux_buffer(brw, "mcs-miptree",
&temp_main_surf, &temp_mcs_surf,
alloc_flags, mt);
--
2.5.5
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