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| author | Jani Nikula <jani.nikula@intel.com> | 2014-05-14 14:02:19 +0400 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2014-05-15 12:04:21 +0400 |
| commit | f4cdbc21444a45d207a8dc175f44d2facfbd0845 (patch) | |
| tree | 6dce3dadce11603c059d17a2dc9ac5360b1dce87 /drivers/ata/pata_cs5520.c | |
| parent | 05adaf1f101f25f40f12c29403e6488f0e45f6b6 (diff) | |
| download | linux-f4cdbc21444a45d207a8dc175f44d2facfbd0845.tar.xz | |
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 <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=76711
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Tested-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/ata/pata_cs5520.c')
0 files changed, 0 insertions, 0 deletions