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ALSA: Enable PCM hw_ptr_jiffies check only in xrun_debug mode

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The PCM hw_ptr jiffies check results sometimes in problems when a
hardware doesn't give smooth hw_ptr updates.  So far, au88x0 and some
other drivers appear not working due to this strict check.
However, this check is a nice debug tool, and the capability should be
still kept.

Hence, we disable this check now as default unless the user enables it
by setting the xrun_debug mode to the specific stream via a proc file.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2009-05-27 10:53:33 +02:00
parent 6af3fb72d2
commit c87d973200
2 changed files with 13 additions and 1 deletions
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5
Documentation/sound/alsa/Procfile.txt
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@@ -104,6 +104,11 @@ card*/pcm*/xrun_debug
When this value is greater than 1, the driver will show the
stack trace additionally. This may help the debugging.
Since 2.6.30, this option also enables the hwptr check using
jiffies. This detects spontaneous invalid pointer callback
values, but can be lead to too much corrections for a (mostly
buggy) hardware that doesn't give smooth pointer updates.
card*/pcm*/sub*/info
The general information of this PCM sub-stream.