drm/i915: take display port power domain in DP HPD handler
Ville noticed that we can call ibx_digital_port_connected() which accesses the HW without holding any power well/runtime pm reference. Fix this by holding a display port power domain reference around the whole hpd_pulse handler. Signed-off-by: NImre Deak <imre.deak@intel.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NDave Airlie <airlied@redhat.com> Cc: stable@vger.kernel.org (3.16+) Signed-off-by: NJani Nikula <jani.nikula@intel.com>
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