drm/i915: Add hardware readout for FEC
Readout the FEC state in encoder->get_config(), this will allow us to ensure that we can correctly inherit the state from boot, and that we set FEC during modeset. Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190925082110.17439-2-maarten.lankhorst@linux.intel.comReviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
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