drm/i915/display: Check the old state to find port sync slave
If the CRTC is going from enabled to disabled and it is a port sync slave, it needs to check to the old state to be disabled before the port sync master. Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by:Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191202222513.337777-1-jose.souza@intel.com
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