[Intel gfx][i-g-t PATCH 3/4] rendercopy/bdw: A workaround for 3D pipeline

["Xiang, Haihao" <haihao.xiang@intel.com>]

From: "Xiang, Haihao" <haihao.xiang@intel.com>

Emit PIPELINE_SELECT twice and make sure the commands in
the first batch buffer have been done.

However I don't know why this works !!!

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
---
 lib/rendercopy_gen8.c |   19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/lib/rendercopy_gen8.c b/lib/rendercopy_gen8.c
index 1a137dd..6eb1051 100644
--- a/lib/rendercopy_gen8.c
+++ b/lib/rendercopy_gen8.c
@@ -148,7 +148,8 @@ batch_copy(struct intel_batchbuffer *batch, const void *ptr, uint32_t size, uint
 
 static void
 gen6_render_flush(struct intel_batchbuffer *batch,
-		  drm_intel_context *context, uint32_t batch_end)
+		drm_intel_context *context, uint32_t batch_end,
+		int waiting)
 {
 	int ret;
 
@@ -157,6 +158,11 @@ gen6_render_flush(struct intel_batchbuffer *batch,
 		ret = drm_intel_gem_bo_context_exec(batch->bo, context,
 						    batch_end, 0);
 	assert(ret == 0);
+
+	if (waiting) {
+		dri_bo_map(batch->bo, 0);
+		dri_bo_unmap(batch->bo);
+	}
 }
 
 /* Mostly copy+paste from gen6, except height, width, pitch moved */
@@ -880,6 +886,15 @@ void gen8_render_copyfunc(struct intel_batchbuffer *batch,
 
 	intel_batchbuffer_flush_with_context(batch, context);
 
+	/* I don't know why it works !!! */
+	batch->ptr = batch->buffer;
+	OUT_BATCH(GEN6_PIPELINE_SELECT | PIPELINE_SELECT_3D);
+	OUT_BATCH(MI_BATCH_BUFFER_END);
+	batch_end = batch_align(batch, 8);
+	assert(batch_end < BATCH_STATE_SPLIT);
+	gen6_render_flush(batch, context, batch_end, 1);
+	intel_batchbuffer_reset(batch);
+
 	batch_align(batch, 8);
 
 	batch->ptr = &batch->buffer[BATCH_STATE_SPLIT];
@@ -968,6 +983,6 @@ void gen8_render_copyfunc(struct intel_batchbuffer *batch,
 
 	annotation_flush(&aub_annotations, batch);
 
-	gen6_render_flush(batch, context, batch_end);
+	gen6_render_flush(batch, context, batch_end, 0);
 	intel_batchbuffer_reset(batch);
 }
-- 
1.7.9.5