drm/i915: Split write of pattern to DP reg from intel_dp_set_link_train

Split the register write with the new link training pattern out of
intel_dp_set_link_train(), so that the i915 specific code is in a
separate function.

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1445594525-7174-3-git-send-email-ander.conselvan.de.oliveira@intel.com

drivers/gpu/drm/i915/intel_dp.c

@@ -3594,20 +3594,28 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp)
 	intel_dp->DP = (intel_dp->DP & ~mask) | signal_levels;
 }
 
-static bool
-intel_dp_set_link_train(struct intel_dp *intel_dp,
-			uint8_t dp_train_pat)
+static void
+intel_dp_program_link_training_pattern(struct intel_dp *intel_dp,
+				       uint8_t dp_train_pat)
 {
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 	struct drm_i915_private *dev_priv =
 		to_i915(intel_dig_port->base.base.dev);
-	uint8_t buf[sizeof(intel_dp->train_set) + 1];
-	int ret, len;
 
 	_intel_dp_set_link_train(intel_dp, &intel_dp->DP, dp_train_pat);
 
 	I915_WRITE(intel_dp->output_reg, intel_dp->DP);
 	POSTING_READ(intel_dp->output_reg);
+}
+
+static bool
+intel_dp_set_link_train(struct intel_dp *intel_dp,
+			uint8_t dp_train_pat)
+{
+	uint8_t buf[sizeof(intel_dp->train_set) + 1];
+	int ret, len;
+
+	intel_dp_program_link_training_pattern(intel_dp, dp_train_pat);
 
 	buf[0] = dp_train_pat;
 	if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) ==