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05dc698c2e
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: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt 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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