commit 1e6f4fc06f6411adf98bbbe7fcd79442cd2b2a75
author Ricard Wanderlof <ricard.wanderlof@axis.com> Thu Sep 07 15:31:38 2017 +0200
committer Mark Brown <broonie@kernel.org> Thu Sep 07 14:46:34 2017 +0100
tree 75f148ede163ca0690cd6ed0141b648e6b35b249
parent 7051334672e54fae67e02d5d3296fb62b3343be7

ASoC: adau17x1: Workaround for noise bug in ADC

The ADC in the ADAU1361 (and possibly other Analog Devices codecs)
exhibits a cyclic variation in the noise floor (in our test setup between
-87 and -93 dB), a new value being attained within this range whenever a
new capture stream is started. The cycle repeats after about 10 or 11
restarts.

The workaround recommended by the manufacturer is to toggle the ADOSR bit
in the Converter Control 0 register each time a new capture stream is
started.

I have verified that the patch fixes this problem on the ADAU1361, and
according to the manufacturer toggling the bit in question in this manner
will at least have no detrimental effect on other chips served by this
driver.

Signed-off-by: Ricard Wanderlof <ricardw@axis.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org