drm/i915: No need to power up PG2 for GMBUS on BXT
GMBUS lives in PG1, so no need to power up PG2. We do want to prevent the DMC from making a mess of things though, so add GMBUS to the DC off power well. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171208213739.16388-2-ville.syrjala@linux.intel.comReviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
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