drm/i915: Start tracking voltage level in the cdclk state
For CNL we'll need to start considering the port clocks when we select the voltage level for the system agent. To that end start tracking the voltage in the cdclk state (since that already has to adjust it). v2: s/voltage/voltage_level/ (Rodrigo) Cc: Mika Kahola <mika.kahola@intel.com> Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171024095216.1638-3-ville.syrjala@linux.intel.com
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