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Add tracepoints for pipe enable/disable. We'll include the frame/scanline counters for all pipes in these tracepoints to help in diagnosing underruns and whatnot when enabling/disabling pipes in parallel with plane updates/flips on another pipe. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190206204910.13965-2-ville.syrjala@linux.intel.com Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>