[Mesa-stable] [PATCH 3/3] i965/gen6/blorp: Remove too heavy HiZ workaround

[Chad Versace]

Commit 1a92881 added extra flushes to fix a HiZ hang in
WebGL Google Maps. With the extra flushes emitted by the previous two
patches, the flushes added by 1a92881 are redundant.

Tested with the same criteria as in 1a92881: by zooming in and out
continuously for 2 hours on Sandybridge Chrome OS (codename
Stumpy) without a hang.

CC: mesa-stable at lists.freedesktop.org
CC: Kenneth Graunke <kenneth at whitecape.org>
CC: Paul Berry <stereotype441 at gmail.com>
CC: Stéphane Marchesin <marcheu at chromium.org>
Signed-off-by: Chad Versace <chad.versace at linux.intel.com>
---
 src/mesa/drivers/dri/i965/gen6_blorp.cpp | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/gen6_blorp.cpp b/src/mesa/drivers/dri/i965/gen6_blorp.cpp
index 9db0840..2e8e8ab 100644
--- a/src/mesa/drivers/dri/i965/gen6_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/gen6_blorp.cpp
@@ -1015,19 +1015,6 @@ gen6_blorp_emit_primitive(struct brw_context *brw,
    brw->batch.need_workaround_flush = true;
 }
 
-static void
-gen6_emit_hiz_workaround(struct brw_context *brw, enum gen6_hiz_op hiz_op)
-{
-   /* This fixes a HiZ hang in WebGL Google Maps. A more minimal fix likely
-    * exists, but this gets the job done.
-    */
-   if (hiz_op == GEN6_HIZ_OP_DEPTH_RESOLVE ||
-       hiz_op == GEN6_HIZ_OP_HIZ_RESOLVE) {
-      intel_emit_post_sync_nonzero_flush(brw);
-      intel_emit_depth_stall_flushes(brw);
-   }
-}
-
 /**
  * \brief Execute a blit or render pass operation.
  *
@@ -1053,7 +1040,6 @@ gen6_blorp_exec(struct brw_context *brw,
    /* Emit workaround flushes when we switch from drawing to blorping. */
    brw->batch.need_workaround_flush = true;
 
-   gen6_emit_hiz_workaround(brw, params->hiz_op);
    gen6_emit_3dstate_multisample(brw, params->dst.num_samples);
    gen6_emit_3dstate_sample_mask(brw,
                                  params->dst.num_samples > 1 ?
-- 
1.8.5.2