drm/amdgpu: disable hw semaphores by default

These are buggy on some asics and not really used anymore
now that the GPU schedular is enabled.

Change-Id: I67182b409d64de308392a15d1a0a15018071dc0b
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -79,7 +79,7 @@ int amdgpu_exp_hw_support = 0;
 int amdgpu_enable_scheduler = 1;
 int amdgpu_sched_jobs = 16;
 int amdgpu_sched_hw_submission = 2;
-int amdgpu_enable_semaphores = 1;
+int amdgpu_enable_semaphores = 0;
 
 MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
 module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@@ -153,7 +153,7 @@ module_param_named(sched_jobs, amdgpu_sched_jobs, int, 0444);
 MODULE_PARM_DESC(sched_hw_submission, "the max number of HW submissions (default 2)");
 module_param_named(sched_hw_submission, amdgpu_sched_hw_submission, int, 0444);
 
-MODULE_PARM_DESC(enable_semaphores, "Enable semaphores (1 = enable (default), 0 = disable)");
+MODULE_PARM_DESC(enable_semaphores, "Enable semaphores (1 = enable, 0 = disable (default))");
 module_param_named(enable_semaphores, amdgpu_enable_semaphores, int, 0644);
 
 static struct pci_device_id pciidlist[] = {