patch "usb: Add device quirk for Logitech PTZ cameras" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: Add device quirk for Logitech PTZ cameras

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Vincent Palatin <[email protected]>
Date: Thu, 1 Oct 2015 14:10:22 -0700
Subject: usb: Add device quirk for Logitech PTZ cameras

Add a device quirk for the Logitech PTZ Pro Camera and its sibling the ConferenceCam CC3000e Camera.
This fixes the failed camera enumeration on some boot, particularly on machines with fast CPU.

Tested by connecting a Logitech PTZ Pro Camera to a machine with a Haswell Core i7-4600U CPU @ 2.10GHz, and doing thousands of reboot cycles while recording the kernel logs and taking camera picture after each boot. Before the patch, more than 7% of the boots show some enumeration transfer failures and in a few of them, the kernel is giving up before actually enumerating the webcam. After the patch, the enumeration has been correct on every reboot.

---
 drivers/usb/core/quirks.c | 7 +++++++
 1 file changed, 7 insertions(+)

index 41fe3ba528df..f5a381945db2 100644
@@ -54,6 +54,13 @@ static const struct usb_device_id usb_quirk_list[] = {
 	{ USB_DEVICE(0x046d, 0x082d), .driver_info = USB_QUIRK_DELAY_INIT },
 	{ USB_DEVICE(0x046d, 0x0843), .driver_info = USB_QUIRK_DELAY_INIT },
 
+	/* Logitech ConferenceCam CC3000e */
+	{ USB_DEVICE(0x046d, 0x0847), .driver_info = USB_QUIRK_DELAY_INIT },
+	{ USB_DEVICE(0x046d, 0x0848), .driver_info = USB_QUIRK_DELAY_INIT },
+
+	/* Logitech PTZ Pro Camera */
+	{ USB_DEVICE(0x046d, 0x0853), .driver_info = USB_QUIRK_DELAY_INIT },
+
 	/* Logitech Quickcam Fusion */
 	{ USB_DEVICE(0x046d, 0x08c1), .driver_info = USB_QUIRK_RESET_RESUME },
 

2.6.0