From: Kenneth Graunke <kenneth@whitecape.org>
Date: Thu, 24 Oct 2013 07:32:52 +0000 (-0700)
Subject: i965: Emit post-sync non-zero flush before 3DSTATE_GS_SVB_INDEX.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=436e815a250a8fde22d79093f4b9eed56472693b;p=mesa.git

i965: Emit post-sync non-zero flush before 3DSTATE_GS_SVB_INDEX.

From the comments above intel_emit_post_sync_nonzero_flush:
"[DevSNB-C+{W/A}] Before any depth stall flush (including those
 produced by non-pipelined state commands), software needs to first
 send a PIPE_CONTROL with no bits set except Post-Sync Operation != 0."

This suggests that every non-pipelined (0x79xx) command needs a
post-sync non-zero flush before it.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Tested-by: Xinkai Chen <yeled.nova@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Cc: "9.2" <mesa-stable@lists.freedesktop.org>
---

diff --git a/src/mesa/drivers/dri/i965/gen6_sol.c b/src/mesa/drivers/dri/i965/gen6_sol.c
index 21da444247f..9a3feb52e71 100644
--- a/src/mesa/drivers/dri/i965/gen6_sol.c
+++ b/src/mesa/drivers/dri/i965/gen6_sol.c
@@ -153,6 +153,9 @@ brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
       = _mesa_compute_max_transform_feedback_vertices(xfb_obj,
                                                       linked_xfb_info);
 
+   /* 3DSTATE_GS_SVB_INDEX is non-pipelined. */
+   intel_emit_post_sync_nonzero_flush(brw);
+
    /* Initialize the SVBI 0 register to zero and set the maximum index. */
    BEGIN_BATCH(4);
    OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));