drm/i915: Pass intel_crtc to intel_lpt_pch_enable()

The function intel_lpt_pch_enable() needs an intel_crtc so pass that
instead of the generic crtc type.
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302125857.14665-3-ander.conselvan.de.oliveira@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -4249,10 +4249,10 @@ void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
 }
 
 /* Program iCLKIP clock to the desired frequency */
-static void lpt_program_iclkip(struct drm_crtc *crtc)
+static void lpt_program_iclkip(struct intel_crtc *crtc)
 {
-	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
-	int clock = to_intel_crtc(crtc)->config->base.adjusted_mode.crtc_clock;
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	int clock = crtc->config->base.adjusted_mode.crtc_clock;
 	u32 divsel, phaseinc, auxdiv, phasedir = 0;
 	u32 temp;
 
@@ -4545,19 +4545,17 @@ static void ironlake_pch_enable(struct intel_crtc *crtc)
 	ironlake_enable_pch_transcoder(dev_priv, pipe);
 }
 
-static void lpt_pch_enable(struct drm_crtc *crtc)
+static void lpt_pch_enable(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 transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
 
 	assert_pch_transcoder_disabled(dev_priv, TRANSCODER_A);
 
 	lpt_program_iclkip(crtc);
 
 	/* Set transcoder timing. */
-	ironlake_pch_transcoder_set_timings(intel_crtc, PIPE_A);
+	ironlake_pch_transcoder_set_timings(crtc, PIPE_A);
 
 	lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
 }
@@ -5394,7 +5392,7 @@ static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
 		intel_enable_pipe(intel_crtc);
 
 	if (intel_crtc->config->has_pch_encoder)
-		lpt_pch_enable(crtc);
+		lpt_pch_enable(intel_crtc);
 
 	if (intel_crtc_has_type(intel_crtc->config, INTEL_OUTPUT_DP_MST))
 		intel_ddi_set_vc_payload_alloc(crtc, true);