drm/amdgpu/gfx9.4.3: Explicitly halt MEC before init

Need to make sure it's halted as we don't know what state
the GPU may have been left in previously.

Tested-by: Amber Lin <Amber.Lin@amd.com>
Acked-by: Amber Lin <Amber.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

@@ -2248,6 +2248,8 @@ static int gfx_v9_4_3_xcc_cp_resume(struct amdgpu_device *adev, int xcc_id)
 		r = gfx_v9_4_3_xcc_cp_compute_load_microcode(adev, xcc_id);
 		if (r)
 			return r;
+	} else {
+		gfx_v9_4_3_xcc_cp_compute_enable(adev, false, xcc_id);
 	}
 
 	r = gfx_v9_4_3_xcc_kiq_resume(adev, xcc_id);