drm/i915/gtt: grab wakeref in gen6_alloc_va_range
Some steps in gen6_alloc_va_range require the HW to be awake, so ideally we should be grabbing the wakeref ourselves and not relying on the caller already holding it for us. Suggested-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NMatthew Auld <matthew.auld@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190529123108.24422-1-matthew.auld@intel.com
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