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-rw-r--r--Documentation/sound/alsa/Procfile.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/Procfile.txt b/Documentation/sound/alsa/Procfile.txt
index 381908d8ca42..719a819f8cc2 100644
--- a/Documentation/sound/alsa/Procfile.txt
+++ b/Documentation/sound/alsa/Procfile.txt
@@ -101,6 +101,8 @@ card*/pcm*/xrun_debug
101 bit 0 = Enable XRUN/jiffies debug messages 101 bit 0 = Enable XRUN/jiffies debug messages
102 bit 1 = Show stack trace at XRUN / jiffies check 102 bit 1 = Show stack trace at XRUN / jiffies check
103 bit 2 = Enable additional jiffies check 103 bit 2 = Enable additional jiffies check
104 bit 3 = Log hwptr update at each period interrupt
105 bit 4 = Log hwptr update at each snd_pcm_update_hw_ptr()
104 106
105 When the bit 0 is set, the driver will show the messages to 107 When the bit 0 is set, the driver will show the messages to
106 kernel log when an xrun is detected. The debug message is 108 kernel log when an xrun is detected. The debug message is
@@ -117,6 +119,9 @@ card*/pcm*/xrun_debug
117 buggy) hardware that doesn't give smooth pointer updates. 119 buggy) hardware that doesn't give smooth pointer updates.
118 This feature is enabled via the bit 2. 120 This feature is enabled via the bit 2.
119 121
122 Bits 3 and 4 are for logging the hwptr records. Note that
123 these will give flood of kernel messages.
124
120card*/pcm*/sub*/info 125card*/pcm*/sub*/info
121 The general information of this PCM sub-stream. 126 The general information of this PCM sub-stream.
122 127