drm/i915: FIFO space query code refactor
When querying the GTFIFOCTL register to check the FIFO space, the read value must be masked. The operation is repeated explicitly in several places. This change refactors the read-and-mask code into a function call. v2: rebased on top of Mika's forcewake patch set, specifically: [PATCH 8/8] drm/i915: Enum forcewake domains and domain identifiers Change-Id: Id1a9f3785cb20b82d4caa330c37b31e4e384a3ef Signed-off-by: NDave Gordon <david.s.gordon@intel.com> Reviewed-by: NMika Kuoppala <mika.kuoppala@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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