drm/i915: Extract out gamma table and CSC to their own file
The moves a couple of functions programming the gamma LUT and CSC units into their own file. On generations prior to Haswell there is only a gamma LUT. From haswell on there is also a new enhanced color correction unit that isn't used yet. This is why we need to set the GAMMA_MODE register, either we're using the legacy 8bits LUT or enhanced LUTs (of 10 or 12bits). The CSC unit is only available from Haswell on. We also need to make a special case for CherryView which is recognized as a gen 8 but doesn't have the same enhanced color correction unit from Haswell on. v2: Fix access to GAMMA_MODE register on older generations than Haswell (from Matt Roper's comments) Signed-off-by: NLionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: NMatt Roper <matthew.d.roper@intel.com> Signed-off-by: NMatt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1458125837-2576-2-git-send-email-lionel.g.landwerlin@intel.com
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