On 13/06/11 16:53, Mark Brown wrote:
Normally DAPM will power up any connected audio path. This is not ideal for sidetone paths as with sidetone paths the audio path is not wanted in itself, it is only desired if the two paths it provides a sidetone between are both active. If the sidetone path causes a power up then it can be hard to minimise pops as we first power up either the sidetone or the main output path and then power the other, with the second power up potentially introducing a DC offset.
Address this by introducing the concept of a weak path. If a path is marked as weak then DAPM will ignore that path when walking the graph, though all the relevant controls are still available to the application layer to allow these paths to be configured.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com
include/sound/soc-dapm.h | 2 + sound/soc/soc-dapm.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 89 insertions(+), 0 deletions(-)
Acked-by: Liam Girdwood lrg@ti.com