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authorTakashi Iwai <tiwai@suse.de>2010-07-08 09:01:17 +0200
committerTakashi Iwai <tiwai@suse.de>2010-07-08 09:01:17 +0200
commit54a3b8dc38d47834336400cbe376a3aca0437cae (patch)
treeaa6141675d3b806d506ae0a32dc34d2d0682da7b /Documentation/sound
parentf978d36da4024ee22957f74276e944624a8c7f6d (diff)
downloadlinux-linaro-android-54a3b8dc38d47834336400cbe376a3aca0437cae.tar.gz
ALSA: Update documents about new bits of xrun_debug proc file
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/Procfile.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/Procfile.txt b/Documentation/sound/alsa/Procfile.txt
index 07301de12cc..7fcd1ad96fc 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.