drm/i915: extract lpt_enable_clkout_dp from lpt_init_pch_refclk

The next step is to modify lpt_enable_clkout_dp to enable support for
"Sequence to enable CLKOUT_DP" and "Sequence to enable CLKOUT_DP
without spread".

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -5264,24 +5264,10 @@ static void lpt_program_fdi_mphy(struct drm_i915_private *dev_priv)
 }
 
 /* Sequence to enable CLKOUT_DP for FDI usage and configure PCH FDI I/O. */
-static void lpt_init_pch_refclk(struct drm_device *dev)
+static void lpt_enable_clkout_dp(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct drm_mode_config *mode_config = &dev->mode_config;
-	struct intel_encoder *encoder;
-	bool has_vga = false;
-	u32 tmp;
-
-	list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
-		switch (encoder->type) {
-		case INTEL_OUTPUT_ANALOG:
-			has_vga = true;
-			break;
-		}
-	}
-
-	if (!has_vga)
-		return;
+	uint32_t tmp;
 
 	mutex_lock(&dev_priv->dpio_lock);
 
@@ -5307,6 +5293,26 @@ static void lpt_init_pch_refclk(struct drm_device *dev)
 	mutex_unlock(&dev_priv->dpio_lock);
 }
 
+static void lpt_init_pch_refclk(struct drm_device *dev)
+{
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct intel_encoder *encoder;
+	bool has_vga = false;
+
+	list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
+		switch (encoder->type) {
+		case INTEL_OUTPUT_ANALOG:
+			has_vga = true;
+			break;
+		}
+	}
+
+	if (!has_vga)
+		return;
+
+	lpt_enable_clkout_dp(dev);
+}
+
 /*
  * Initialize reference clocks when the driver loads
  */