From: Calvin Owens <jcalvinowens@gmail.com>
Date: Sat, 13 Apr 2013 03:33:59 +0000 (-0500)
Subject: ALSA: usb: Add quirk for 192KHz recording on E-Mu devices
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~52^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1539d4f82ad534431cc67935e8e442ccf107d17d;p=pandora-kernel.git

ALSA: usb: Add quirk for 192KHz recording on E-Mu devices

When recording at 176.2KHz or 192Khz, the device adds a 32-bit length
header to the capture packets, which obviously needs to be ignored for
recording to work properly.

Userspace expected:  L0 L1 L2 R0 R1 R2
...but actually got: R2 L0 L1 L2 R0 R1

Also, the last byte of the length header being interpreted as L0 of
the first sample caused spikes every 0.5ms, resulting in a loud 16KHz
tone (about the highest 'B' on a piano) being present throughout
captures.

Tested at all sample rates on an E-Mu 0404USB, and tested for
regressions on a generic USB headset.

Signed-off-by: Calvin Owens <jcalvinowens@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

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