drm/i915/dp: force eDP lane count to max available lanes on BDW
There are certain BDW high res eDP machines that regressed due to commit 38aecea0 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Mar 3 11:18:10 2014 +0100 drm/i915: reverse dp link param selection, prefer fast over wide again The commit lead to 2 lanes at 5.4 Gbps being used instead of 4 lanes at 2.7 Gbps on the affected machines. Link training succeeded for both, but the screen remained blank with the former config. Further investigation showed that 4 lanes at 5.4 Gbps worked also. The root cause for the blank screen using 2 lanes remains unknown, but apparently the driver for a certain other operating system by default uses the max available lanes. Follow suit on Broadwell eDP, for at least until we figure out what is going on. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76711Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: NRodrigo Vivi <rodrigo.vivi@gmail.com> Tested-by: NRodrigo Vivi <rodrigo.vivi@gmail.com> Signed-off-by: NJani Nikula <jani.nikula@intel.com>
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