drm/amd/display: reset stream slice count for new ODM policy

[why]
ODM combine could prevent us from supporting more planes
we will reset ODM slice count back to 1 when all planes have
been removed to maximize the amount of planes supported when
new planes are added.

[how]
reset ODM slice count when all planes are removed.
Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -2874,6 +2874,15 @@ bool dc_remove_plane_from_context(
 
 	stream_status->plane_states[stream_status->plane_count] = NULL;
 
+	if (stream_status->plane_count == 0 && dc->config.enable_windowed_mpo_odm)
+		/* ODM combine could prevent us from supporting more planes
+		 * we will reset ODM slice count back to 1 when all planes have
+		 * been removed to maximize the amount of planes supported when
+		 * new planes are added.
+		 */
+		resource_update_pipes_for_stream_with_slice_count(
+				context, dc->current_state, dc->res_pool, stream, 1);
+
 	return true;
 }