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drm/i915: cleanup rc6 code
Cleanup several aspects of the rc6 code:
- misnamed intel_disable_clock_gating function (was only about rc6)
- remove commented call to intel_disable_clock_gating
- rc6 enabling code belongs in its own function (allows us to move the
actual clock gating enable call back into restore_state)
- allocate power & render contexts up front, only free on unload
(avoids ugly lazy init at rc6 enable time)
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: checkpatch cleanup]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>