drm/i915: make sure eDP panel is turned on
When enabling the eDP port, we need to make sure the panel is turned on after training the link. If we don't, it likely won't come back after suspend or may not come up at all. For unknown reasons, unlocking the panel regs before initiating a power on sequence is necessary. There are known bugs in the PCH panel sequencing logic, apparently this is one possible workaround. Fixes https://bugs.freedesktop.org/show_bug.cgi?id=28739. Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Tested-by: N"Paulo J. S. Silva" <pjssilva@gmail.com> Signed-off-by: NEric Anholt <eric@anholt.net>
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