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

commit 41c32e5d upstream.

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>
[nc: Backport to 4.9, drop unneeded hunks]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/i915/intel_fifo_underrun.c

@@ -185,11 +185,11 @@ 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)
@@ -201,7 +201,7 @@ 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);
 
 	assert_spin_locked(&dev_priv->irq_lock);
@@ -212,12 +212,12 @@ static void cpt_check_pch_fifo_underruns(struct intel_crtc *crtc)
 	I915_WRITE(SERR_INT, SERR_INT_TRANS_FIFO_UNDERRUN(pch_transcoder));
 	POSTING_READ(SERR_INT);
 
-	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);
@@ -235,8 +235,8 @@ 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));
 		}
 	}
 }
@@ -388,8 +388,8 @@ 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))
-		DRM_ERROR("PCH transcoder %s FIFO underrun\n",
-			  transcoder_name(pch_transcoder));
+		DRM_ERROR("PCH transcoder %c FIFO underrun\n",
+			  pipe_name(pch_transcoder));
 }
 
 /**