drm/i915: Store struct intel_crtc * in {pipe,plane}_to_crtc_mapping[]

A lot of users of the {pipe,plane}_to_crtc_mapping[] will end up
casting the result to intel_crtc, so let's just store the intel_crtc
pointer in the first place.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477946245-14134-7-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index bf19192..1696f7b 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4065,8 +4065,7 @@ static void hsw_trans_edp_pipe_A_crc_wa(struct drm_i915_private *dev_priv,
 					bool enable)
 {
 	struct drm_device *dev = &dev_priv->drm;
-	struct intel_crtc *crtc =
-		to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_A]);
+	struct intel_crtc *crtc = dev_priv->pipe_to_crtc_mapping[PIPE_A];
 	struct intel_crtc_state *pipe_config;
 	struct drm_atomic_state *state;
 	int ret = 0;
@@ -4134,8 +4133,7 @@ static int pipe_crc_set_source(struct drm_i915_private *dev_priv,
 {
 	struct drm_device *dev = &dev_priv->drm;
 	struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
-	struct intel_crtc *crtc =
-			to_intel_crtc(intel_get_crtc_for_pipe(dev, pipe));
+	struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev, pipe);
 	enum intel_display_power_domain power_domain;
 	u32 val = 0; /* shut up gcc */
 	int ret;
@@ -4206,8 +4204,7 @@ static int pipe_crc_set_source(struct drm_i915_private *dev_priv,
 	/* real source -> none transition */
 	if (source == INTEL_PIPE_CRC_SOURCE_NONE) {
 		struct intel_pipe_crc_entry *entries;
-		struct intel_crtc *crtc =
-			to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
+		struct intel_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
 
 		DRM_DEBUG_DRIVER("stopping CRCs for pipe %c\n",
 				 pipe_name(pipe));