drm/i915: Add fifo underrun reporting state to debugfs

On platforms with shared interrupt enable bits (which are shared even
with the pipe CRC logic) there's some tricky corner cases. Add
information to make debugging those easier.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2357,6 +2357,10 @@ static int i915_display_info(struct seq_file *m, void *unused)
 				   x, y, crtc->cursor_addr,
 				   yesno(active));
 		}
+
+		seq_printf(m, "\tunderrun reporting: cpu=%s pch=%s \n",
+			   yesno(!crtc->cpu_fifo_underrun_disabled),
+			   yesno(!crtc->pch_fifo_underrun_disabled));
 	}
 
 	seq_printf(m, "\n");