Add USB quirk for HVR-950q to avoid intermittent device resets

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commit 6836796de4 upstream.

The USB core and sysfs will attempt to enumerate certain parameters
which are unsupported by the au0828 - causing inconsistent behavior
and sometimes causing the chip to reset.  Avoid making these calls.

This problem manifested as intermittent cases where the au8522 would
be reset on analog video startup, in particular when starting up ALSA
audio streaming in parallel - the sysfs entries created by
snd-usb-audio on streaming startup would result in unsupported control
messages being sent during tuning which would put the chip into an
unknown state.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Devin Heitmueller 2017-06-27 13:08:51 -04:00 • committed by Greg Kroah-Hartman

parent da8990d3c1

commit 3d10568742

1 changed files with 4 additions and 0 deletions

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drivers/usb/core/quirks.c

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