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ALSA: pcm: Add xrun_injection proc entry

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This patch adds a new proc entry for PCM substreams to inject an
XRUN.  When a PCM substream is running and any value is written to its
xrun_injection proc file, the driver triggers XRUN.  This is a useful
feature for debugging XRUN and error handling code paths.

Note that this entry is enabled only when CONFIG_SND_PCM_XRUN_DEBUG is
set.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-11-04 14:02:40 +01:00
parent f5914908a5
commit 2b30d411db
3 changed files with 40 additions and 0 deletions
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4
Documentation/sound/alsa/Procfile.txt
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@ -133,6 +133,10 @@ card*/pcm*/sub*/sw_params
card*/pcm*/sub*/prealloc
The buffer pre-allocation information.
card*/pcm*/sub*/xrun_injection
Triggers an XRUN to the running stream when any value is
written to this proc file. Used for fault injection.
This entry is write-only.
AC97 Codec Information
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