This is a note to let you know that I've just added the patch titled
usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests
to the 3.13-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-make-delay_init-quirk-wait-100ms-between-get-configuration-requests.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d86db25e53fa69e3e97f3b55dd82a70689787c5d Mon Sep 17 00:00:00 2001
From: Julius Werner <jwerner@xxxxxxxxxxxx>
Date: Tue, 4 Mar 2014 11:27:38 -0800
Subject: usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests
From: Julius Werner <jwerner@xxxxxxxxxxxx>
commit d86db25e53fa69e3e97f3b55dd82a70689787c5d upstream.
The DELAY_INIT quirk only reduces the frequency of enumeration failures
with the Logitech HD Pro C920 and C930e webcams, but does not quite
eliminate them. We have found that adding a delay of 100ms between the
first and second Get Configuration request makes the device enumerate
perfectly reliable even after several weeks of extensive testing. The
reasons for that are anyone's guess, but since the DELAY_INIT quirk
already delays enumeration by a whole second, wating for another 10th of
that isn't really a big deal for the one other device that uses it, and
it will resolve the problems with these webcams.
Signed-off-by: Julius Werner <jwerner@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/config.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -718,6 +718,10 @@ int usb_get_configuration(struct usb_dev
result = -ENOMEM;
goto err;
}
+
+ if (dev->quirks & USB_QUIRK_DELAY_INIT)
+ msleep(100);
+
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
bigbuffer, length);
if (result < 0) {
Patches currently in stable-queue which might be from jwerner@xxxxxxxxxxxx are
queue-3.13/usb-add-device-quirk-for-logitech-hd-pro-webcams-c920-and-c930e.patch
queue-3.13/usb-make-delay_init-quirk-wait-100ms-between-get-configuration-requests.patch
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