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

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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 96b21b0dac1e8c15fb20c19c85d13a58ab95b285..3116edfcdc18558aa768d248f1ff1881448ced09 100644 (file)
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -223,6 +223,10 @@ static const struct usb_device_id usb_quirk_list[] = {
        /* Blackmagic Design UltraStudio SDI */
        { USB_DEVICE(0x1edb, 0xbd4f), .driver_info = USB_QUIRK_NO_LPM },
 
+       /* Hauppauge HVR-950q */
+       { USB_DEVICE(0x2040, 0x7200), .driver_info =
+                       USB_QUIRK_CONFIG_INTF_STRINGS },
+
        /* INTEL VALUE SSD */
        { USB_DEVICE(0x8086, 0xf1a5), .driver_info = USB_QUIRK_RESET_RESUME },