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commit34511dce4bupstream. It has been found out that in some HW combination the DisplayPort fast link training feature caused screen flickering. Let's revert this feature for now until we can ensure that the feature works for all platforms. This is a manual revert of commits5fa836a9d8("drm/i915: DP link training optimization") and4e96c97742("drm/i915: eDP link training optimization"). Fixes:5fa836a9d8("drm/i915: DP link training optimization") Fixes:4e96c97742("drm/i915: eDP link training optimization") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91393 Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Mika Kahola <mika.kahola@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1466410226-19543-1-git-send-email-mika.kahola@intel.com (cherry picked from commit91df09d92a) Signed-off-by: Joakim Tjernlund <joakim.tjernlund@infinera.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>