drm/i915: Separate cherryview from valleyview

The cherryview device shares many characteristics with the valleyview
device.  When support was added to the driver for cherryview, the
corresponding device info structure included .is_valleyview = 1.
This is not correct and leads to some confusion.

This patch changes .is_valleyview to .is_cherryview in the cherryview
device info structure and simplifies the IS_CHERRYVIEW macro.
Then where appropriate, instances of IS_VALLEYVIEW are replaced with
IS_VALLEYVIEW || IS_CHERRYVIEW or equivalent.

v2: Use IS_VALLEYVIEW || IS_CHERRYVIEW instead of defining a new macro.
    Also add followup patches to fix issues discovered during the first
    review. (Ville)
v3: Fix some style issues and one gen check. Remove CRT related changes
    as CRT is not supported on CHV. (Imre, Ville)
v4: Make a few more optimizations. (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Wayne Boyer <wayne.boyer@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449692975-14803-1-git-send-email-wayne.boyer@intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index 5ad2e66..3db0623 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -376,7 +376,7 @@
 	if (HAS_PCH_IBX(dev_priv->dev)) {
 		aud_config = IBX_AUD_CFG(pipe);
 		aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
-	} else if (IS_VALLEYVIEW(dev_priv)) {
+	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 		aud_config = VLV_AUD_CFG(pipe);
 		aud_cntrl_st2 = VLV_AUD_CNTL_ST2;
 	} else {
@@ -436,7 +436,8 @@
 		aud_config = IBX_AUD_CFG(pipe);
 		aud_cntl_st = IBX_AUD_CNTL_ST(pipe);
 		aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
-	} else if (IS_VALLEYVIEW(connector->dev)) {
+	} else if (IS_VALLEYVIEW(connector->dev) ||
+		   IS_CHERRYVIEW(connector->dev)) {
 		hdmiw_hdmiedid = VLV_HDMIW_HDMIEDID(pipe);
 		aud_config = VLV_AUD_CFG(pipe);
 		aud_cntl_st = VLV_AUD_CNTL_ST(pipe);
@@ -562,7 +563,7 @@
 	if (IS_G4X(dev)) {
 		dev_priv->display.audio_codec_enable = g4x_audio_codec_enable;
 		dev_priv->display.audio_codec_disable = g4x_audio_codec_disable;
-	} else if (IS_VALLEYVIEW(dev)) {
+	} else if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
 		dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
 		dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
 	} else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8) {