drm/amdgpu: no need load microcode at sdma if powerplay is enabled

SDMA firmware will be loaded by SMU manager if powerplay is enabled.
So it needn't load at SDMA.
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c

@@ -567,6 +567,7 @@ static int sdma_v2_4_start(struct amdgpu_device *adev)
 {
 	int r;
 
+	if (!adev->pp_enabled) {
 		if (!adev->firmware.smu_load) {
 			r = sdma_v2_4_load_microcode(adev);
 			if (r)
@@ -581,6 +582,7 @@ static int sdma_v2_4_start(struct amdgpu_device *adev)
 			if (r)
 				return -EINVAL;
 		}
+	}
 
 	/* halt the engine before programing */
 	sdma_v2_4_enable(adev, false);