drm/exynos: g2d: move PM management to runqueue worker
Do all pm_runtime_{get,put}() calls in the runqueue worker. Also keep track of the engine's idle/busy state. Signed-off-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de> Acked-by: NMarek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NInki Dae <inki.dae@samsung.com>
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