drm/i915/dp: Ensure the HW is powered during HW state readout
authorImre Deak <imre.deak@intel.com>
Fri, 12 Feb 2016 16:55:18 +0000 (18:55 +0200)
committerJani Nikula <jani.nikula@intel.com>
Mon, 22 Feb 2016 15:44:38 +0000 (17:44 +0200)
commitaef882ee118c81b665bd95e2466ff403fe022cfc
tree75c5036ea2142cd60588268fc5335f9bbb70e710
parenta7b484e60080f9b9955237b2efe4eb486170eb75
drm/i915/dp: Ensure the HW is powered during HW state readout

The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-10-git-send-email-imre.deak@intel.com
(cherry picked from commit 6fa9a5ecf7a54450b255229ac1fc6df276cf0653)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
drivers/gpu/drm/i915/intel_dp.c