drm/i915/dp: Power down sink before disable pipe/transcoder clock
Disabling pipe/transcoder clock before power down sink could cause sink lost signal, causing it to trigger a hotplug to notify source that link signal was lost. Cc: Lucas De Marchi <lucas.demarchi@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/20191202222513.337777-2-jose.souza@intel.com
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