gpu: nvgpu: fix setting gr_pd_ab_dist_cfg1_r()

gr_*__set_alpha_circular_buffer_size() left max_batches field of
  gr_pd_ab_dist_cfg1_r as 0 which results in too many alpha beta
  transitions and poor performance when tessellation or geometry
  shaders are used

Change-Id: Ic3673f45b60674b3527641a6fdda0cedc6861db5
Signed-off-by: David Li <davli@nvidia.com>
Reviewed-on: http://git-master/r/840079
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
index 04856e44..6bdb9a7c 100644
--- a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
+++ b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
@@ -388,7 +388,8 @@ static void gr_gp10b_set_alpha_circular_buffer_size(struct gk20a *g, u32 data)
                 gr_pd_ab_dist_cfg1_max_output_granularity_v();
 
         gk20a_writel(g, gr_pd_ab_dist_cfg1_r(),
-                gr_pd_ab_dist_cfg1_max_output_f(pd_ab_max_output));
+                gr_pd_ab_dist_cfg1_max_output_f(pd_ab_max_output) |
+                gr_pd_ab_dist_cfg1_max_batches_init_f());
 
         for (gpc_index = 0; gpc_index < gr->gpc_count; gpc_index++) {
                 stride = proj_gpc_stride_v() * gpc_index;