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The common atomic_get_output_bus_fmts helper for HDMI bridge connectors, called drm_atomic_helper_bridge_get_hdmi_output_bus_fmts, should return an array of output bus formats depending on the supported formats of the connector, and the current output BPC. Add a test to exercise some of this helper. Reviewed-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Daniel Stone <daniel@fooishbar.org> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Link: https://patch.msgid.link/20260609-color-format-v17-22-35739b5782cc@collabora.com Signed-off-by: Daniel Stone <daniels@collabora.com>