drm/i915/dp: Add a standalone function to obtain shared dpll for HSW/BDW/SKL/BXT
Add the PLL selection code for HSW/BDW/BXT/SKL into a stand-alone function in order to allow for the implementation of a platform neutral upfront link training function. v4: * Removed dereferencing NULL pointer in case of failure (Dhinakaran Pandiyan) v3: * Add Hooks for all DDI platforms into this standalone function v2: * Change the macro to use dev_priv instead of dev (David Weinehall) Reviewed-by: NDurgadoss R <durgadoss.r@intel.com> Signed-off-by: NManasi Navare <manasi.d.navare@intel.com> Signed-off-by: NJim Bride <jim.bride@linux.intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
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