gpu: nvgpu: Support probing host1x link from apps

This patch adds support to check if the host1x link exists and is
supported using the gpu characteristics ioctl.

Bug 1459653

Change-Id: I832eea217ed7f007e341dfde5769887e0882d6bb
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/433058

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index 3388a2ff..629423c0 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -1817,6 +1817,13 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
         gpu->big_page_size = g->mm.big_page_size;
         gpu->compression_page_size = g->mm.compression_page_size;
         gpu->pde_coverage_bit_count = g->mm.pde_stride_shift;
+
+        gpu->flags = 0;
+
+        if (IS_ENABLED(CONFIG_TEGRA_GK20A) &&
+            gk20a_platform_has_syncpoints(g->dev))
+                gpu->flags |= NVHOST_GPU_FLAGS_HAS_SYNCPOINTS;
+
         gpu->reserved = 0;
 
         return 0;