drm/amdgpu: check SMU NULL ptr on gfx hw init

Check SMU NULL ptr before load smu fw.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -6540,14 +6540,16 @@ static int gfx_v10_0_hw_init(void *handle)
 		 * loaded firstly, so in direct type, it has to load smc ucode
 		 * here before rlc.
 		 */
-		r = smu_load_microcode(&adev->smu);
-		if (r)
-			return r;
+		if (adev->smu.ppt_funcs != NULL) {
+			r = smu_load_microcode(&adev->smu);
+			if (r)
+				return r;
 
-		r = smu_check_fw_status(&adev->smu);
-		if (r) {
-			pr_err("SMC firmware status is not correct\n");
-			return r;
+			r = smu_check_fw_status(&adev->smu);
+			if (r) {
+				pr_err("SMC firmware status is not correct\n");
+				return r;
+			}
 		}
 	}