drm/amdgpu: skip suspend/resume on DRM_SWITCH_POWER_DYNAMIC_OFF

Missed this case previously. No need to do anything if the
device is already off.  runtime pm will handle it.
Acked-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1839,7 +1839,8 @@ int amdgpu_device_suspend(struct drm_device *dev, bool suspend, bool fbcon)
 
 	adev = dev->dev_private;
 
-	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
+	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF ||
+	    dev->switch_power_state == DRM_SWITCH_POWER_DYNAMIC_OFF)
 		return 0;
 
 	drm_kms_helper_poll_disable(dev);
@@ -1920,7 +1921,8 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon)
 	struct drm_crtc *crtc;
 	int r;
 
-	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
+	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF ||
+	    dev->switch_power_state == DRM_SWITCH_POWER_DYNAMIC_OFF)
 		return 0;
 
 	if (fbcon) {