drm/i915: Keep the AKSV details in intel_dp_hdcp_write_an_aksv()
Let's try to keep the details on the AKSV stuff concentrated in one place. So move the control bit and +5 data size handling there. v2: Increase txbuf[] to include the payload which intel_dp_aux_xfer() will still load into the registers even though the hardware will ignore it Cc: Sean Paul <seanpaul@chromium.org> Cc: Ramalingam C <ramalingam.c@intel.com> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180222212732.4665-1-ville.syrjala@linux.intel.comReviewed-by: NRamalingam C <ramalingam.c@intel.com>
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