drm/i915: Move most cdclk/rawclk related code to intel_cdclk.c

Let's try to shrink intel_display.c a bit by moving the cdclk/rawclk
stuff to a new file. It's all reasonably self contained so we don't
even have to add that many non-static symbols.

We'll also take the opportunity to shuffle around the functions a bit
to get things in a more consistent order based on the platform.

v2: Add kernel-docs (Ander)
v3: Deal with IS_GEN9_BC()
v4: Deal with i945gm_get_cdclk()
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170207183305.19656-1-ville.syrjala@linux.intel.com

Documentation/gpu/i915.rst

@@ -213,6 +213,15 @@ Video BIOS Table (VBT)
 .. kernel-doc:: drivers/gpu/drm/i915/intel_vbt_defs.h
    :internal:
 
+Display clocks
+--------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_cdclk.c
+   :doc: CDCLK / RAWCLK
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_cdclk.c
+   :internal:
+
 Display PLLs
 ------------
 

drivers/gpu/drm/i915/Makefile

@@ -72,6 +72,7 @@ i915-y += intel_audio.o \
 	  intel_atomic.o \
 	  intel_atomic_plane.o \
 	  intel_bios.o \
+	  intel_cdclk.o \
 	  intel_color.o \
 	  intel_display.o \
 	  intel_dpio_phy.o \

drivers/gpu/drm/i915/intel_drv.h

@@ -1246,12 +1246,19 @@ void intel_audio_codec_disable(struct intel_encoder *encoder);
 void i915_audio_component_init(struct drm_i915_private *dev_priv);
 void i915_audio_component_cleanup(struct drm_i915_private *dev_priv);
 
+/* intel_cdclk.c */
+void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv);
+void intel_update_max_cdclk(struct drm_i915_private *dev_priv);
+void intel_update_cdclk(struct drm_i915_private *dev_priv);
+void intel_update_rawclk(struct drm_i915_private *dev_priv);
+
 /* intel_display.c */
 enum transcoder intel_crtc_pch_transcoder(struct intel_crtc *crtc);
-void skl_set_preferred_cdclk_vco(struct drm_i915_private *dev_priv, int vco);
 void intel_update_rawclk(struct drm_i915_private *dev_priv);
 int vlv_get_cck_clock(struct drm_i915_private *dev_priv,
 		      const char *name, u32 reg, int ref_freq);
+int vlv_get_cck_clock_hpll(struct drm_i915_private *dev_priv,
+			   const char *name, u32 reg);
 void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv);
 void lpt_disable_iclkip(struct drm_i915_private *dev_priv);
 extern const struct drm_plane_funcs intel_plane_funcs;