[Mesa-dev] [PATCH 2/6] i965/gen9: Only allow Y-Tiled MCS buffers

Ben Widawsky benjamin.widawsky at intel.com
Mon Jun 8 15:38:28 PDT 2015

For GEN9, much of the logic to use X-Tiled buffers has been stripped out. It is
still supported in some places, but it's never desirable. Unfortunately we don't
yet have the ability to have Y-Tiled scanout (see:

NOTE: This patch shouldn't actually do anything since SKL doesn't yet use fast
clears, and that's the only case we can get to this function (by way of

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Reviewed-by: Chad Versace <chad.versace at intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat at gmail.com>
 src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 6fc68a6..bc7029c 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -193,6 +193,8 @@ intel_is_non_msrt_mcs_buffer_supported(struct brw_context *brw,
       return false;
+   if (brw->gen >= 9 && mt->tiling != I915_TILING_Y)
+      return false;
    if (mt->tiling != I915_TILING_X &&
        mt->tiling != I915_TILING_Y)
       return false;

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