Add phantom slice support on IVB+

HW requires driver to add a phantom slice when FirstMbX and FirstMbY are
not 0, in order to avc decoding error concealment. Otherwise, GPU may hang.
This patch is a workround for bug: https://bugs.freedesktop.org/show_bug.cgi?id=81447

v1->v2: Follow haihao's suggestion to use common funcion of gen6 phantom slice.
v2->v3: Remove an extraneous newline.

Signed-off-by: Zhong Li <zhong.li@intel.com>
Reviewed-by: Xiang Haihao <haihao.xiang@intel.com>
             Gwenole Beauchesne <gwenole.beauchesne@intel.com>
(cherry picked from commit 9672c5ab17c32f25ce1bbdb883abda689440b116)

3 files changed, 36 insertions, 0 deletions

diff --git a/src/gen75_mfd.c b/src/gen75_mfd.c
index a89640d..299f2b5 100644
--- a/src/gen75_mfd.c
+++ b/src/gen75_mfd.c
@@ -812,6 +812,15 @@ gen75_mfd_avc_directmode_state(VADriverContextP ctx,
 }
 
 static void
+gen75_mfd_avc_phantom_slice_first(VADriverContextP ctx,
+                                 VAPictureParameterBufferH264 *pic_param,
+                                 VASliceParameterBufferH264 *next_slice_param,
+                                 struct gen7_mfd_context *gen7_mfd_context)
+{
+    gen6_mfd_avc_phantom_slice(ctx, pic_param, next_slice_param, gen7_mfd_context->base.batch);
+}
+
+static void
 gen75_mfd_avc_slice_state(VADriverContextP ctx,
                          VAPictureParameterBufferH264 *pic_param,
                          VASliceParameterBufferH264 *slice_param,
@@ -1145,6 +1154,9 @@ gen75_mfd_avc_decode_picture(VADriverContextP ctx,
         else
             next_slice_group_param = (VASliceParameterBufferH264 *)decode_state->slice_params[j + 1]->buffer;
 
+        if (j == 0 && slice_param->first_mb_in_slice)
+            gen75_mfd_avc_phantom_slice_first(ctx, pic_param, slice_param, gen7_mfd_context); 
+
         for (i = 0; i < decode_state->slice_params[j]->num_elements; i++) {
             assert(slice_param->slice_data_flag == VA_SLICE_DATA_FLAG_ALL);
             assert((slice_param->slice_type == SLICE_TYPE_I) ||
diff --git a/src/gen7_mfd.c b/src/gen7_mfd.c
index 7ab2955..bfb95bf 100755
--- a/src/gen7_mfd.c
+++ b/src/gen7_mfd.c
@@ -506,6 +506,15 @@ gen7_mfd_avc_directmode_state(VADriverContextP ctx,
 }
 
 static void
+gen7_mfd_avc_phantom_slice_first(VADriverContextP ctx,
+                                 VAPictureParameterBufferH264 *pic_param,
+                                 VASliceParameterBufferH264 *next_slice_param,
+                                 struct gen7_mfd_context *gen7_mfd_context)
+{
+    gen6_mfd_avc_phantom_slice(ctx, pic_param, next_slice_param, gen7_mfd_context->base.batch);
+}
+
+static void
 gen7_mfd_avc_slice_state(VADriverContextP ctx,
                          VAPictureParameterBufferH264 *pic_param,
                          VASliceParameterBufferH264 *slice_param,
@@ -842,6 +851,9 @@ gen7_mfd_avc_decode_picture(VADriverContextP ctx,
         else
             next_slice_group_param = (VASliceParameterBufferH264 *)decode_state->slice_params[j + 1]->buffer;
 
+        if (j == 0 && slice_param->first_mb_in_slice)
+            gen7_mfd_avc_phantom_slice_first(ctx, pic_param, slice_param, gen7_mfd_context); 
+
         for (i = 0; i < decode_state->slice_params[j]->num_elements; i++) {
             assert(slice_param->slice_data_flag == VA_SLICE_DATA_FLAG_ALL);
             assert((slice_param->slice_type == SLICE_TYPE_I) ||
diff --git a/src/gen8_mfd.c b/src/gen8_mfd.c
index 5e1b70b..b482846 100644
--- a/src/gen8_mfd.c
+++ b/src/gen8_mfd.c
@@ -575,6 +575,15 @@ gen8_mfd_avc_directmode_state(VADriverContextP ctx,
 }
 
 static void
+gen8_mfd_avc_phantom_slice_first(VADriverContextP ctx,
+                                 VAPictureParameterBufferH264 *pic_param,
+                                 VASliceParameterBufferH264 *next_slice_param,
+                                 struct gen7_mfd_context *gen7_mfd_context)
+{
+    gen6_mfd_avc_phantom_slice(ctx, pic_param, next_slice_param, gen7_mfd_context->base.batch);
+}
+
+static void
 gen8_mfd_avc_slice_state(VADriverContextP ctx,
                          VAPictureParameterBufferH264 *pic_param,
                          VASliceParameterBufferH264 *slice_param,
@@ -908,6 +917,9 @@ gen8_mfd_avc_decode_picture(VADriverContextP ctx,
         else
             next_slice_group_param = (VASliceParameterBufferH264 *)decode_state->slice_params[j + 1]->buffer;
 
+        if (j == 0 && slice_param->first_mb_in_slice)
+            gen8_mfd_avc_phantom_slice_first(ctx, pic_param, slice_param, gen7_mfd_context); 
+
         for (i = 0; i < decode_state->slice_params[j]->num_elements; i++) {
             assert(slice_param->slice_data_flag == VA_SLICE_DATA_FLAG_ALL);
             assert((slice_param->slice_type == SLICE_TYPE_I) ||