drm/i915: merge VLV eDP and DP AUX clock divider calculation

On ValleyView for both eDP and DP the AUX input clock is 200MHz, so we
can calculate for both the clock divider for the 2MHz target rate at the
same place. Afterwards we can also replace the is_cpu_edp() check with a
check for port A.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -317,12 +317,12 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
 	 * Note that PCH attached eDP panels should use a 125MHz input
 	 * clock divider.
 	 */
-	if (is_cpu_edp(intel_dp)) {
+	if (IS_VALLEYVIEW(dev)) {
+		aux_clock_divider = 100;
+	} else if (intel_dig_port->port == PORT_A) {
 		if (HAS_DDI(dev))
 			aux_clock_divider = DIV_ROUND_CLOSEST(
 				intel_ddi_get_cdclk_freq(dev_priv), 2000);
-		else if (IS_VALLEYVIEW(dev))
-			aux_clock_divider = 100;
 		else if (IS_GEN6(dev) || IS_GEN7(dev))
 			aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
 		else