tree df411938303a20ab2710bb939526252a74572900
parent d3babd3fcd92f345ab3c627ad6bfa1463de52ba2
author Ville Syrjälä <ville.syrjala@linux.intel.com> 1415351762 +0200
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1415957360 +0100

drm/i915: Pass the current pipe from eDP init to backlight setup

On VLV/CHV both pipes A and B have their own backlight control
registers. In order to correctly read out the current hardware state at
init we need to know which pipe is driving the eDP port. Pass that
information down from the eDP init code into the backlight code.

To determine the correct pipe we first look at which pipe is currently
configured in the port control register, if that look invalid we look
at which pipe's PPS is currently controlling the port, and if that
too looks invalid we just assume pipe A.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>