drm/i915: always set FDI composite sync bit
commit c4f9c4c2 upstream. It's needed for 3 pipe support as well as just regular functionality (e.g. DisplayPort). Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: Adam Jackson <ajax@redhat.com> Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com> Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Robert Hooker <robert.hooker@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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