drm/i915: Pass intel_crtc to ironlake_fdi_disable()

Switch to intel_crtc from drm_crtc.
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118164430.27265-6-ville.syrjala@linux.intel.com

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

@@ -5061,12 +5061,10 @@ static void ironlake_fdi_pll_disable(struct intel_crtc *intel_crtc)
 	udelay(100);
 }
 
-static void ironlake_fdi_disable(struct drm_crtc *crtc)
+static void ironlake_fdi_disable(struct intel_crtc *crtc)
 {
-	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	enum pipe pipe = intel_crtc->pipe;
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
 	i915_reg_t reg;
 	u32 temp;
 
@@ -6772,7 +6770,7 @@ static void ironlake_crtc_disable(struct intel_crtc_state *old_crtc_state,
 	ironlake_pfit_disable(old_crtc_state);
 
 	if (old_crtc_state->has_pch_encoder)
-		ironlake_fdi_disable(crtc);
+		ironlake_fdi_disable(intel_crtc);
 
 	intel_encoders_post_disable(state, intel_crtc);