drm/i915: Do not read GAMMA_MODE register
Implement Daniel Stone's recommendation to not read registers to infer the hardware's state. v2: Read GAMMA_MODE register value at init (Matt Roper's comment) v3: Read GAMMA_MODE register in intel_modeset_readout_hw_state along with other registers (Matt Roper's comment). v4: Mask GAMMA_MODE register with interesting bits when reading 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: http://patchwork.freedesktop.org/patch/msgid/1458125837-2576-3-git-send-email-lionel.g.landwerlin@intel.com
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