From: Julius Werner Date: Tue, 4 Mar 2014 18:52:39 +0000 (-0800) Subject: usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e X-Git-Tag: firefly_0821_release~3679^2~2621 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d6f10324218d3edbb7f64c85ff5f36c2942b1163;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 01fe36273f3b..1053eb651b2f 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -46,6 +46,10 @@ static const struct usb_device_id usb_quirk_list[] = { /* Microsoft LifeCam-VX700 v2.0 */ { USB_DEVICE(0x045e, 0x0770), .driver_info = USB_QUIRK_RESET_RESUME }, + /* Logitech HD Pro Webcams C920 and C930e */ + { USB_DEVICE(0x046d, 0x082d), .driver_info = USB_QUIRK_DELAY_INIT }, + { USB_DEVICE(0x046d, 0x0843), .driver_info = USB_QUIRK_DELAY_INIT }, + /* Logitech Quickcam Fusion */ { USB_DEVICE(0x046d, 0x08c1), .driver_info = USB_QUIRK_RESET_RESUME },