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>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 169fc2d8c554e85f86adf2cf4f5e0b4b32edc432..98ab492ee60adef54cff0e90f071c12be0ab7a2c 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/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");