Mesa (master): intel/isl: Select Y-tiling for stencil on gen12

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Module: Mesa
Branch: master
Commit: d9565160b289b8ebf3d953e57e156382bc62ecc3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d9565160b289b8ebf3d953e57e156382bc62ecc3

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Mon Jan  8 16:28:46 2018 -0800

intel/isl: Select Y-tiling for stencil on gen12

Rework:
 * Disallow linear 1D stencil buffers (Nanley)
 * Force Y for gen12 stencil rather than ~W (Nanley)

Co-authored-by: Nanley Chery <nanley.g.chery at intel.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
Reviewed-by: Nanley Chery <nanley.g.chery at intel.com>

---

 src/intel/isl/isl_gen7.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/intel/isl/isl_gen7.c b/src/intel/isl/isl_gen7.c
index a9db21fba52..e1feae9b375 100644
--- a/src/intel/isl/isl_gen7.c
+++ b/src/intel/isl/isl_gen7.c
@@ -213,11 +213,14 @@ isl_gen6_filter_tiling(const struct isl_device *dev,
       *flags &= ISL_TILING_ANY_Y_MASK;
    }
 
-   /* Separate stencil requires W tiling, and W tiling requires separate
-    * stencil.
-    */
    if (isl_surf_usage_is_stencil(info->usage)) {
-      *flags &= ISL_TILING_W_BIT;
+      if (ISL_DEV_GEN(dev) >= 12) {
+         /* Stencil requires Y. */
+         *flags &= ISL_TILING_ANY_Y_MASK;
+      } else {
+         /* Stencil requires W. */
+         *flags &= ISL_TILING_W_BIT;
+      }
    } else {
       *flags &= ~ISL_TILING_W_BIT;
    }