usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e
authorJulius Werner <jwerner@chromium.org>
Tue, 4 Mar 2014 18:52:39 +0000 (10:52 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 24 Mar 2014 04:38:15 +0000 (21:38 -0700)
commitd6f10324218d3edbb7f64c85ff5f36c2942b1163
tree3aaec587908792b90967880260faad48ea678473
parentb569c493e79db75017c8f505f7235459bd1a6f65
usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e

commit e0429362ab15c46ea4d64c3f8c9e0933e48a143a upstream.

We've encountered a rare issue when enumerating two Logitech webcams
after a reboot that doesn't power cycle the USB ports. They are spewing
random data (possibly some leftover UVC buffers) on the second
(full-sized) Get Configuration request of the enumeration phase. Since
the data is random this can potentially cause all kinds of odd behavior,
and since it occasionally happens multiple times (after the kernel
issues another reset due to the garbled configuration descriptor), it is
not always recoverable. Set the USB_DELAY_INIT quirk that seems to work
around the issue.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/quirks.c