drm/i915: split fdi code out from intel_display.c

This just refactors out the fdi code to a separate file.
Signed-off-by: Dave Airlie <airlied@redhat.com>
[Jani: cleaned up intel_fdi.h a bit.]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f9d52c3d91f0973af308ede16e266fc9b753ecf9.1610622609.git.jani.nikula@intel.com

drivers/gpu/drm/i915/Makefile

@@ -206,6 +206,7 @@ i915-y += \
 	display/intel_dpll_mgr.o \
 	display/intel_dsb.o \
 	display/intel_fbc.o \
+	display/intel_fdi.o \
 	display/intel_fifo_underrun.o \
 	display/intel_frontbuffer.o \
 	display/intel_global_state.o \

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

@@ -1852,4 +1852,13 @@ static inline u32 i9xx_dpll_compute_fp(struct dpll *dpll)
 	return dpll->n << 16 | dpll->m1 << 8 | dpll->m2;
 }
 
+static inline u32 intel_fdi_link_freq(struct drm_i915_private *dev_priv,
+				      const struct intel_crtc_state *pipe_config)
+{
+	if (HAS_DDI(dev_priv))
+		return pipe_config->port_clock; /* SPLL */
+	else
+		return dev_priv->fdi_pll_freq;
+}
+
 #endif /*  __INTEL_DISPLAY_TYPES_H__ */

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

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef _INTEL_FDI_H_
+#define _INTEL_FDI_H_
+
+struct drm_i915_private;
+struct intel_crtc;
+struct intel_crtc_state;
+
+#define I915_DISPLAY_CONFIG_RETRY 1
+int ilk_fdi_compute_config(struct intel_crtc *intel_crtc,
+			   struct intel_crtc_state *pipe_config);
+void intel_fdi_normal_train(struct intel_crtc *crtc);
+void ilk_fdi_disable(struct intel_crtc *crtc);
+void ilk_fdi_pll_disable(struct intel_crtc *intel_crtc);
+void ilk_fdi_pll_enable(const struct intel_crtc_state *crtc_state);
+void intel_fdi_init_hook(struct drm_i915_private *dev_priv);
+
+#endif