drm/amd/display: Avoid get/put vblank when stream disabled

[Why]
amdgpu_dm_crtc_set_crc_source() will call
amdgpu_dm_crtc_configure_crc_source() to enable/disable CRC
generation. However, configuration will be deferred to stream enabled.
If stream is not enabled, current flow will still try to get/put vblank
refcount.

[How]
Return EINVAL to skip actions on vblank refcount when stream is not
enabled.
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Chao-kai Wang <Stylon.Wang@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -9036,8 +9036,9 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 			}
 
 			if (configure_crc)
-				amdgpu_dm_crtc_configure_crc_source(
-					crtc, dm_new_crtc_state, cur_crc_src);
+				if (amdgpu_dm_crtc_configure_crc_source(
+					crtc, dm_new_crtc_state, cur_crc_src))
+					DRM_DEBUG_DRIVER("Failed to configure crc source");
 #endif
 		}
 	}

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c

@@ -176,7 +176,7 @@ int amdgpu_dm_crtc_configure_crc_source(struct drm_crtc *crtc,
 
 	/* Configuration will be deferred to stream enable. */
 	if (!stream_state)
-		return 0;
+		return -EINVAL;
 
 	mutex_lock(&adev->dm.dc_lock);