drm/i915/display: add intel_fdi_link_train wrapper.

This wraps the fdi link training vfunc to make it clearer.

Suggested by Jani.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1bb978bcb6f16fbdaf08f2800a179b774525b59e.1632869550.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -2165,7 +2165,7 @@ static void ilk_pch_enable(const struct intel_atomic_state *state,
 	assert_pch_transcoder_disabled(dev_priv, pipe);
 
 	/* For PCH output, training FDI link */
-	dev_priv->display.fdi_link_train(crtc, crtc_state);
+	intel_fdi_link_train(crtc, crtc_state);
 
 	/* We need to program the right clock selection before writing the pixel
 	 * mutliplier into the DPLL. */

drivers/gpu/drm/i915/display/intel_fdi.c

@@ -10,6 +10,14 @@
 #include "intel_fdi.h"
 #include "intel_sideband.h"
 
+void intel_fdi_link_train(struct intel_crtc *crtc,
+			  const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+
+	dev_priv->display.fdi_link_train(crtc, crtc_state);
+}
+
 /* units of 100MHz */
 static int pipe_required_fdi_lanes(struct intel_crtc_state *crtc_state)
 {

drivers/gpu/drm/i915/display/intel_fdi.h

@@ -26,4 +26,6 @@ void hsw_fdi_link_train(struct intel_encoder *encoder,
 void intel_fdi_pll_freq_update(struct drm_i915_private *i915);
 void lpt_fdi_program_mphy(struct drm_i915_private *i915);
 
+void intel_fdi_link_train(struct intel_crtc *crtc,
+			  const struct intel_crtc_state *crtc_state);
 #endif