drm/i915/fbc: Extract snb_fbc_program_fence()
We have two identical copies of the snb+ system agent CPU fence programming code. Extract into a helper. Also there's no real point in insisting that we program 0 into DPFC_CPU_FENCE_OFFSET when the fence is disabled. So just always stick the computed Y offset there whether or not the fence is actually used or not. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211104144520.22605-2-ville.syrjala@linux.intel.comAcked-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Mika Kahola <mika.kahola@intel.com>
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