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usb: gadget: uac2: add req_number as parameter

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There are only two requests for uac2, it may not be enough at high
loading system which usb interrupt handler can't be serviced on
time, then the data will be lost since it is isoc transfer for audio.

In this patch, we introduce a parameter for the number for usb request,
and the user can override it if current number for request is not enough
for his/her use case.

Besides, update this parameter for legacy audio gadget and documentation.

Signed-off-by: Peter Chen <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
This commit is contained in:
Peter Chen 2017-01-04 10:19:23 +08:00 • committed by Felipe Balbi
commit e92b9d449d
4 changed files with 34 additions and 10 deletions
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2
Documentation/usb/gadget-testing.txt
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@ -632,6 +632,8 @@ The uac2 function provides these attributes in its function directory:
p_chmask - playback channel mask
p_srate - playback sampling rate
p_ssize - playback sample size (bytes)
req_number - the number of pre-allocated request for both capture
and playback
The attributes have sane default values.