drm/i915: handle bogus VBT panel timing
We've seen cases in the wild where the VBT sync data is wrong, so add some code to fix it up in that case, taking care to make sure that the total is greater than the sync end. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Dave Airlie <airlied@linux.ie>
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