drm/i915/skl: WaIgnoreDDIAStrap is forever, always init DDI A
authorJani Nikula <jani.nikula@intel.com>
Fri, 14 Aug 2015 07:53:17 +0000 (10:53 +0300)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 14 Aug 2015 15:50:43 +0000 (17:50 +0200)
commit5a2376d1360bfc9ebf3b554dd8db1922d42cee4b
tree538fb3e9a38bb7b4043dc6f635d92d9936a09f8a
parentf79b468eca20dae31b6fcaaa738a7f99b764837d
drm/i915/skl: WaIgnoreDDIAStrap is forever, always init DDI A

There is currently conflicting documentation on which steppings the
workaround is needed, up to C vs. forever. However there is post-C
stepping hardware that doesn't report port presence on DDI A, leading to
black screen on eDP. Assume the strap isn't connected, and try to enable
DDI A on these machines. (We'll still check the VBT for the info in DDI
init.)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/intel_display.c