This condition inside drm_output_render() checks if we can reuse the existing renderer buffer for the primary plane; this occurs in mixed-mode composition where a client buffer promoted to a plane has changed, but the primary plane is unchanged. We accomplish this by checking if there is no damage on the primary/renderer plane, and then if there is already a renderer buffer active on the primary plane: in that case, we can reuse the buffer we already have. There was a further condition checking if the width and height were identical. This was designed to prevent against issues on mode changes. However, runtime mode changes are already quite broken, and a mode change will also cause damage on the full plane. We can simply remove this condition. Signed-off-by: Daniel Stone <daniels@collabora.com>dev
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