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Make if clear whether we're talking tile widths in bytes or in pixels.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455569699-27905-3-git-send-email-ville.syrjala@linux.intel.com

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>