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ALSA: hda-intel - add special 'hwio' model to bypass initialization

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Using the 'model=hwio' option, the driver bypasses any codec
initialization and the reset procedure for codecs is also
bypassed. This mode is usefull to enable direct access using
hwdep interface (using hdaverb or hda-analyzer tools) and
retain codec setup from BIOS.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela
2010-03-26 10:28:46 +01:00
parent 306ff3e473
commit cd508fe58b
3 changed files with 25 additions and 10 deletions
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5
Documentation/sound/alsa/HD-Audio.txt
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@@ -196,6 +196,11 @@ generic parser regardless of the codec. Usually the codec-specific
parser is much better than the generic parser (as now). Thus this
option is more about the debugging purpose.
Another special meaning has 'model=hwio'. For this model, the driver
bypasses any codec initialization and the reset procedure for codecs
is also bypassed. This mode is usefull to enable direct access using
hwdep interface (using hdaverb or hda-analyzer tools) and retain
codec setup from BIOS.
Speaker and Headphone Output
~~~~~~~~~~~~~~~~~~~~~~~~~~~~