gpu: nvgpu: assume no syncpt support if no "nvidia,host1x" in dt

It'll let gpu tests pass by using sem before enabling syncpt.

Especially for vgpu, the plat data is shared across different GPUs, so
we can use dt to override and disable syncpt.

Jira VFND-3796

Change-Id: I2cc32a1ea1cc1097047427eb1e52ec50c3a0bf90
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: http://git-master/r/1507494
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Nirav Patel <nipatel@nvidia.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/nvhost.c b/drivers/gpu/nvgpu/common/linux/nvhost.c
index 19e41e17..e190096e 100644
--- a/drivers/gpu/nvgpu/common/linux/nvhost.c
+++ b/drivers/gpu/nvgpu/common/linux/nvhost.c
@@ -42,8 +42,11 @@ int nvgpu_get_nvhost_dev(struct gk20a *g)
                 }
 
         } else {
-                host1x_pdev = to_platform_device(g->dev->parent);
-                dev_warn(g->dev, "host1x reference not found. assuming host1x to be parent");
+                if (g->has_syncpoints) {
+                        dev_warn(g->dev, "host1x reference not found. assuming no syncpoints support\n");
+                        g->has_syncpoints = false;
+                }
+                return 0;
         }
 
         g->nvhost_dev = nvgpu_kzalloc(g, sizeof(struct nvgpu_nvhost_dev));