Mesa (master): i965: Don't force x-tiling for 16-bpp formats on Gen>7

[Neil Roberts]

Module: Mesa
Branch: master
Commit: 67e3302497e90a4602921b4ac4621e97df60f850
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=67e3302497e90a4602921b4ac4621e97df60f850

Author: Neil Roberts <neil at linux.intel.com>
Date:   Thu Feb 19 16:09:41 2015 +0000

i965: Don't force x-tiling for 16-bpp formats on Gen>7

Sandybridge doesn't support y-tiling for surface formats with 16 or
more bpp. There was previously an override to explicitly allow this
for Gen7. However, this restriction is also removed in Gen8+ so we
should use y-tiling there too.

This is important to do for Skylake which doesn't support x-tiling for
3D surfaces.

Reviewed-by: Ben Widawsky <ben at bwidawsk.net>

---

 src/mesa/drivers/dri/i965/intel_mipmap_tree.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 0e3888f..e085841 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -515,10 +515,10 @@ intel_miptree_choose_tiling(struct brw_context *brw,
    /* From the Sandybridge PRM, Volume 1, Part 2, page 32:
     * "NOTE: 128BPE Format Color Buffer ( render target ) MUST be either TileX
     *  or Linear."
-    * 128 bits per pixel translates to 16 bytes per pixel.  This is necessary
-    * all the way back to 965, but is explicitly permitted on Gen7.
+    * 128 bits per pixel translates to 16 bytes per pixel. This is necessary
+    * all the way back to 965, but is permitted on Gen7+.
     */
-   if (brw->gen != 7 && mt->cpp >= 16)
+   if (brw->gen < 7 && mt->cpp >= 16)
       return I915_TILING_X;
 
    /* From the Ivy Bridge PRM, Vol4 Part1 2.12.2.1 (SURFACE_STATE for most