drm/amdgpu: skip kfd suspend/resume for S0ix

GFX is in gfxoff mode during s0ix so we shouldn't need to
actually tear anything down and restore it.
Acked-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3734,6 +3734,7 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
 
 	r = amdgpu_device_ip_suspend_phase1(adev);
 
+	if (!adev->in_s0ix)
 		amdgpu_amdkfd_suspend(adev, adev->in_runpm);
 
 	/* evict vram memory */
@@ -3794,9 +3795,11 @@ int amdgpu_device_resume(struct drm_device *dev, bool fbcon)
 	queue_delayed_work(system_wq, &adev->delayed_init_work,
 			   msecs_to_jiffies(AMDGPU_RESUME_MS));
 
+	if (!adev->in_s0ix) {
 		r = amdgpu_amdkfd_resume(adev, adev->in_runpm);
 		if (r)
 			return r;
+	}
 
 	/* Make sure IB tests flushed */
 	flush_delayed_work(&adev->delayed_init_work);