drm/i915: Fix enum pipe vs. enum transcoder for the PCH transcoder

Use enum pipe for PCH transcoders also in the FIFO underrun code.

Fixes the following new sparse warnings:
intel_fifo_underrun.c:340:49: warning: mixing different enum types
intel_fifo_underrun.c:340:49:     int enum pipe  versus
intel_fifo_underrun.c:340:49:     int enum transcoder
intel_fifo_underrun.c:344:49: warning: mixing different enum types
intel_fifo_underrun.c:344:49:     int enum pipe  versus
intel_fifo_underrun.c:344:49:     int enum transcoder
intel_fifo_underrun.c:397:57: warning: mixing different enum types
intel_fifo_underrun.c:397:57:     int enum pipe  versus
intel_fifo_underrun.c:397:57:     int enum transcoder
intel_fifo_underrun.c:398:17: warning: mixing different enum types
intel_fifo_underrun.c:398:17:     int enum pipe  versus
intel_fifo_underrun.c:398:17:     int enum transcoder

Cc: Matthias Kaehlcke <mka@chromium.org>
Fixes: a2196033 ("drm/i915: Consistently use enum pipe for PCH transcoders")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170901143123.7590-3-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_trace.h

@@ -38,7 +38,7 @@ TRACE_EVENT(intel_cpu_fifo_underrun,
 );
 
 TRACE_EVENT(intel_pch_fifo_underrun,
-	    TP_PROTO(struct drm_i915_private *dev_priv, enum transcoder pch_transcoder),
+	    TP_PROTO(struct drm_i915_private *dev_priv, enum pipe pch_transcoder),
 	    TP_ARGS(dev_priv, pch_transcoder),
 
 	    TP_STRUCT__entry(
@@ -48,7 +48,7 @@ TRACE_EVENT(intel_pch_fifo_underrun,
 			     ),
 
 	    TP_fast_assign(
-			   enum pipe pipe = (enum pipe)pch_transcoder;
+			   enum pipe pipe = pch_transcoder;
 			   __entry->pipe = pipe;
 			   __entry->frame = dev_priv->drm.driver->get_vblank_counter(&dev_priv->drm, pipe);
 			   __entry->scanline = intel_get_crtc_scanline(intel_get_crtc_for_pipe(dev_priv, pipe));

drivers/gpu/drm/i915/intel_fifo_underrun.c

@@ -187,11 +187,11 @@ static void broadwell_set_fifo_underrun_reporting(struct drm_device *dev,
 }
 
 static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,
-					    enum transcoder pch_transcoder,
+					    enum pipe pch_transcoder,
 					    bool enable)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	uint32_t bit = (pch_transcoder == TRANSCODER_A) ?
+	uint32_t bit = (pch_transcoder == PIPE_A) ?
 		       SDE_TRANSA_FIFO_UNDER : SDE_TRANSB_FIFO_UNDER;
 
 	if (enable)
@@ -203,7 +203,7 @@ static void ibx_set_fifo_underrun_reporting(struct drm_device *dev,
 static void cpt_check_pch_fifo_underruns(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	enum transcoder pch_transcoder = (enum transcoder) crtc->pipe;
+	enum pipe pch_transcoder = crtc->pipe;
 	uint32_t serr_int = I915_READ(SERR_INT);
 
 	lockdep_assert_held(&dev_priv->irq_lock);
@@ -215,12 +215,12 @@ static void cpt_check_pch_fifo_underruns(struct intel_crtc *crtc)
 	POSTING_READ(SERR_INT);
 
 	trace_intel_pch_fifo_underrun(dev_priv, pch_transcoder);
-	DRM_ERROR("pch fifo underrun on pch transcoder %s\n",
-		  transcoder_name(pch_transcoder));
+	DRM_ERROR("pch fifo underrun on pch transcoder %c\n",
+		  pipe_name(pch_transcoder));
 }
 
 static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
-					    enum transcoder pch_transcoder,
+					    enum pipe pch_transcoder,
 					    bool enable, bool old)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -238,8 +238,8 @@ static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
 
 		if (old && I915_READ(SERR_INT) &
 		    SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder)) {
-			DRM_ERROR("uncleared pch fifo underrun on pch transcoder %s\n",
-				  transcoder_name(pch_transcoder));
+			DRM_ERROR("uncleared pch fifo underrun on pch transcoder %c\n",
+				  pipe_name(pch_transcoder));
 		}
 	}
 }
@@ -395,8 +395,8 @@ void intel_pch_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv,
 	if (intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder,
 						  false)) {
 		trace_intel_pch_fifo_underrun(dev_priv, pch_transcoder);
-		DRM_ERROR("PCH transcoder %s FIFO underrun\n",
-			  transcoder_name(pch_transcoder));
+		DRM_ERROR("PCH transcoder %c FIFO underrun\n",
+			  pipe_name(pch_transcoder));
 	}
 }