This is a note to let you know that I've just added the patch titled
usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-add-device-quirk-for-logitech-hd-pro-webcams-c920-and-c930e.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e0429362ab15c46ea4d64c3f8c9e0933e48a143a Mon Sep 17 00:00:00 2001
From: Julius Werner <jwerner@xxxxxxxxxxxx>
Date: Tue, 4 Mar 2014 10:52:39 -0800
Subject: usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e
From: Julius Werner <jwerner@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/quirks.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -46,6 +46,10 @@ static const struct usb_device_id usb_qu
/* 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 },
Patches currently in stable-queue which might be from jwerner@xxxxxxxxxxxx are
queue-3.10/usb-add-device-quirk-for-logitech-hd-pro-webcams-c920-and-c930e.patch
queue-3.10/usb-make-delay_init-quirk-wait-100ms-between-get-configuration-requests.patch
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