Mesa (master): i965: Fix GPU hangs in the dummy fragment shader.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 393b42240f22dbbfb4f089036319031ad36173f3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=393b42240f22dbbfb4f089036319031ad36173f3

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sat Feb 18 12:59:40 2012 -0800

i965: Fix GPU hangs in the dummy fragment shader.

The dummy FB write failed to specify EOT and a message length, causing
the GPU to hang.  Now we can enjoy "everyone's favorite color" again.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index bf1da9d..f9b3064 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1809,6 +1809,8 @@ fs_visitor::emit_dummy_fs()
    fs_inst *write;
    write = emit(FS_OPCODE_FB_WRITE, fs_reg(0), fs_reg(0));
    write->base_mrf = 2;
+   write->mlen = 4;
+   write->eot = true;
 }
 
 /* The register location here is relative to the start of the URB