drm/i915/bxt: Restrict PORT_CLK_SEL programming below gen9
Satheeshakrishna M authored

PORT_CLK_SEL programming is needed only on HSW/BDW.

v2:
- don't program PORT_CLK_SEL from mst encoders either (imre)
v3:
- fix the check for GEN9+ in intel_mst_pre_enable_dp() (damien)
Signed-off-by: default avatarSatheeshakrishna M <satheeshakrishna.m@intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarSagar Kamble <sagar.a.kamble@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
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