tree 11ee2c66d6e3c113cc5a6167b35a79cd08e93844
parent a14fb85d464bb6d0a1bf7f723407d4d6a544379d
author Kailang Yang <kailang@realtek.com> 1460429703 +0800
committer chrome-bot <chrome-bot@chromium.org> 1463497393 -0700

UPSTREAM: ALSA: usb-audio: Skip volume controls triggers hangup on Dell USB Dock

This is Dell usb dock audio workaround.
It was fixed the master volume keep lower.

[Some background: the patch essentially skips the controls of a couple
 of FU volumes.  Although the firmware exposes the dB and the value
 information via the usb descriptor, changing the values (we set the
 min volume as default) screws up the device.  Although this has been
 fixed in the newer firmware, the devices are shipped with the old
 firmware, thus we need the workaround in the driver side.  -- tiwai]

Signed-off-by: Kailang Yang <kailang@realtek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

BUG=chrome-os-partner:48451
TEST=Manual test Dell usb dock

Change-Id: I90764e3e41223232c395cd6780d3aea5c60e3059
Reviewed-on: https://chromium-review.googlesource.com/345351
Commit-Ready: Hsinyu Chao <hychao@chromium.org>
Tested-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>