From: Stuart Longland <redhatter@gentoo.org>
Date: Fri, 18 Jun 2010 02:56:10 +0000 (+1000)
Subject: ASoC: Fix overflow bug in SOC_DOUBLE_R_SX_TLV
X-Git-Tag: v2.6.36-rc1~493^2~1^2~69
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=20630c7f5966419dd6a1f00b669a7771e228510a;p=pandora-kernel.git

ASoC: Fix overflow bug in SOC_DOUBLE_R_SX_TLV

When SX_TLV widgets are read, if the gain is set to a value below 0dB,
the mixer control is erroniously read as being at maximum volume.

The value read out of the CODEC register is never sign-extended, and
when the minimum value is subtracted (read; added, since the minimum is
negative) the result is a number greater than the maximum allowed value
for the control, and hence it saturates.

Solution: Mask the result so that it "wraps around", emulating
sign-extension.

Signed-off-by: Stuart Longland <redhatter@gentoo.org>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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