drm/amdgpu/vcn: enable VCN DPG mode for dimgrey_cavefish

Enable VCN DPG mode for dimgrey_cavefish.
Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -905,7 +905,7 @@ static int nv_common_early_init(void *handle)
 		break;
 	case CHIP_DIMGREY_CAVEFISH:
 		adev->cg_flags = 0;
-		adev->pg_flags = 0;
+		adev->pg_flags = AMD_PG_SUPPORT_VCN_DPG;
 		adev->external_rev_id = adev->rev_id + 0x3c;
 		break;
 	default: