[PATCH libdrm] radeon: use SAMPLE_SPLIT=2 for better MSAA perf on EG/CM

[Marek Olšák <maraeo@xxxxxxxxx>]

From: Marek Olšák <marek.olsak@xxxxxxx>

---
 radeon/radeon_surface.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/radeon/radeon_surface.c b/radeon/radeon_surface.c
index 5ec9745..1424660 100644
--- a/radeon/radeon_surface.c
+++ b/radeon/radeon_surface.c
@@ -957,8 +957,10 @@ static int eg_surface_best(struct radeon_surface_manager *surf_man,
             }
             surf->stencil_tile_split = 64;
         } else {
-            /* tile split must be >= 256 for colorbuffer surfaces */
-            surf->tile_split = MAX2(surf->nsamples * surf->bpe * 64, 256);
+            /* tile split must be >= 256 for colorbuffer surfaces,
+             * SAMPLE_SPLIT = tile_split / (bpe * 64), the optimal value is 2
+             */
+            surf->tile_split = MAX2(2 * surf->bpe * 64, 256);
             if (surf->tile_split > 4096)
                 surf->tile_split = 4096;
         }
-- 
2.7.4

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