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VGA detection requires the reference clock to be on, so make sure this is the case. This fixes VGA hotplug/manual detection where all pipes are off and so we would normally disable all clocks. v2: - Instead of disabling PSR clock gating, force the reference clock on through the DPLL_A register. (Kin Chan S <kin.s.chan@intel.com>) v3: - Move enabling of the clock to intel_reset_dpio() and use the DPLL_B register instead, where we already have a similar tweak for the CRI clock. (Ville) Reported-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>