]> git.baikalelectronics.ru Git - kernel.git/commit
usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests
authorJulius Werner <jwerner@chromium.org>
Tue, 4 Mar 2014 19:27:38 +0000 (11:27 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 7 Mar 2014 19:46:51 +0000 (11:46 -0800)
commitd696837cd59f566b6ab463eafcd9534bdcaff376
tree4cd6a19f0f6004f5cce7ddb5a85f52e3db7dd9d0
parenta4679d06e00b48c898b1f3e897fd9ced77ac6c73
usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests

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@chromium.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/config.c