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Instead of only tracking if the FE is running, use a enum to better describe the various states the GPU can be in. This allows some additional validation to make sure that functions that expect a certain GPU state are only called when the GPU is actually in that state. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>