From: Jani Nikula Date: Wed, 14 May 2014 10:02:19 +0000 (+0300) Subject: drm/i915/dp: force eDP lane count to max available lanes on BDW X-Git-Tag: omap-for-v3.16/fixes-against-rc1~182^2^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4cdbc21444a45d207a8dc175f44d2facfbd0845;p=pandora-kernel.git 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 38aecea0ccbb909d635619cba22f1891e589b434 Author: Daniel Vetter 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=76711 Reviewed-by: Daniel Vetter Reviewed-by: Rodrigo Vivi Tested-by: Rodrigo Vivi Signed-off-by: Jani Nikula --- Reading git-diff-tree failed