tree 9a2f82b403b6eaff89b1f439475892971a54f0de
parent c53786afcc281872371e068ab73597d29501a635
author Weiyin Jiang <wjiang@codeaurora.org> 1554821994 +0800
committer Gerrit - the friendly Code Review server <code-review@localhost> 1554975718 -0700

hal: optimize switch from combo to solo device

For playback usecases routing change, audio HAL disables sound device
if existing sound device does not match derived sound device and
enables the derived sound device. It does not check whether existing
sound device is a combination multiple devices and if one of those
devices matches with the derived sound device.

With scenarios like ringtone over speaker-and-bt-a2dp followed by
a2dp playback, we disable and re-enable bt-a2dp. This is unneeded
if a2dp backend is already active. Optimze such scenarios by
disabling only devices that do not match the derived sound device.

This change squashes the followings.
I171fbead85746a2a34632f7580f56ef40505665c
(hal: Prevent superfluous device tear down on routing change)
Id1bd00bfa5f0236400529e5771851749421ac84c
(hal: Fix combo device issue with routing change)
I4afb4a573de68f17d0ff9af63403713065bfec12
(hal: align ref_cnt of combo device and its split devices)

Change-Id: I359b8a98c76206acd9085431c393825aa6dd0425