tree 50e4497fe2a3aae489c4749f135f031ff31430ca
parent 02d90cd42dafc401b2da437fedbef233a7bd5aeb
author Bhalchandra Gajare <gajare@codeaurora.org> 1317696881 -0700
committer Bhalchandra Gajare <gajare@codeaurora.org> 1319050905 -0700

ASoC: WCD9310: Switch micbias to VDDIO to avoid click noise in playback

The microphone bias used for headset microphone is also used for button
polling in case of headset. This causes fluctuation of current on the
headphone path, resulting in a periodic clicking noise.

Switching the microphone bias to VDDIO when headphone playback is in
progress and headset mic recording is not in progress avoids the click
noise problem

Change-Id: Ic9a1de508bbf48703f4e42c12c1cf4d08cad748b
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>