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    • Chris Wilson's avatar
      drm/i915/display: Record the plane update times for debugging · 829270e4
      Chris Wilson authored
      Since we try and estimate how long we require to update the registers to
      perform a plane update, it is of vital importance that we measure the
      distribution of plane updates to better guide our estimate. If we
      underestimate how long it takes to perform the plane update, we may
      slip into the next scanout frame causing a tear. If we overestimate, we
      may unnecessarily delay the update to the next frame, causing visible
      jitter.
      
      Replace the warning that we exceed some arbitrary threshold for the
      vblank update with a histogram for debugfs.
      
      v2: Add a per-crtc debugfs entry so that the information is easier to
      extract when testing individual CRTC, and so that it can be reset before
      a test.
      
      v3: Flip the graph on its side; creates space to label the time axis.
      
      Updates: 4684
             |
         1us |
             |
         4us |********
             |**********
        16us |***********
             |*****
        66us |
             |
       262us |
             |
         1ms |
             |
         4ms |
             |
        17ms |
             |
      Min update: 5918ns
      Max update: 54781ns
      Average update: 16628ns
      Overruns > 250us: 0
      
      Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1982Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Jani Nikula <jani.nikula@linux.intel.com>
      Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
      Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> #v2
      Link: https://patchwork.freedesktop.org/patch/msgid/20201202212814.26320-1-chris@chris-wilson.co.uk
      829270e4