drm/i915: apply DP bandwidth workaround for PCH eDP as well
Fixes https://bugs.freedesktop.org/show_bug.cgi?id=29141 though the workaround itself is still a bit of a mystery. Tested-by: NAdam Hill <sidepipeuk@yahoo.co.uk> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NEric Anholt <eric@anholt.net>
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