drm/amdgpu: enable async gfx ring by default

VDDGFX requires gfx queue to be installed via MAP_QUEUES packet.
Hence, enable async gfx ring by default.

Signed-off-by: Jack Xiao <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 uint amdgpu_smu_memory_pool_size = 0;
 /* FBC (bit 0) disabled by default*/
 uint amdgpu_dc_feature_mask = 0;
-int amdgpu_async_gfx_ring = 0;
+int amdgpu_async_gfx_ring = 1;
 
 struct amdgpu_mgpu_info mgpu_info = {
 	.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
···
  * It is used to enable gfx rings that could be configured with different prioritites or equal priorities
  */
 MODULE_PARM_DESC(async_gfx_ring,
-	"Asynchronous GFX rings that could be configured with either different priorities (HP3D ring and LP3D ring), or equal priorities (0 = disabled (default), 1 = enabled)");
+	"Asynchronous GFX rings that could be configured with either different priorities (HP3D ring and LP3D ring), or equal priorities (0 = disabled, 1 = enabled (default))");
 module_param_named(async_gfx_ring, amdgpu_async_gfx_ring, int, 0444);
 
 #ifdef CONFIG_HSA_AMD