This isuue got introduced in -
commit 
24ee0e64909bf7f1953d87d3e1e29d93eafcad73
Author: Gaurav K Singh <gaurav.k.singh@intel.com>
Date:   Fri Dec 5 14:24:21 2014 +0530
    drm/i915: Update the DSI enable path to support dual
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
 
 
 
                /* recovery disables */
-               I915_WRITE(MIPI_EOT_DISABLE(port), val);
+               I915_WRITE(MIPI_EOT_DISABLE(port), tmp);
 
                /* in terms of low power clock */
                I915_WRITE(MIPI_INIT_COUNT(port), intel_dsi->init_count);