1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/sound/alsa/Procfile.txt b/Documentation/sound/alsa/Procfile.txt
index 07301de12cc4..7fcd1ad96fcc 100644
--- a/Documentation/sound/alsa/Procfile.txt
+++ b/Documentation/sound/alsa/Procfile.txt
@@ -103,6 +103,8 @@ card*/pcm*/xrun_debug
           bit 2 = Enable additional jiffies check
           bit 3 = Log hwptr update at each period interrupt
           bit 4 = Log hwptr update at each snd_pcm_update_hw_ptr()
+          bit 5 = Show last 10 positions on error
+          bit 6 = Do above only once
 
         When the bit 0 is set, the driver will show the messages to
         kernel log when an xrun is detected.  The debug message is
@@ -122,6 +124,12 @@ card*/pcm*/xrun_debug
         Bits 3 and 4 are for logging the hwptr records.  Note that
         these will give flood of kernel messages.
 
+        When bit 5 is set, the driver logs the last 10 xrun errors and
+        the proc file shows each jiffies, position, period_size,
+        buffer_size, old_hw_ptr, and hw_ptr_base values.
+
+        When bit 6 is set, the full xrun log is shown only once.
+
 card*/pcm*/sub*/info
         The general information of this PCM sub-stream.