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Speaker amplifier feedback is not modeled as being dependent on any
active output. Even when there is no playback happening, parts of the
graph, specifically the IV sense->speaker protection->output remains
active and this prevents the DSP from entering low-power states.
This patch suggests a machine driver level approach where the speaker
pins are enabled/disabled dynamically depending on stream start/stop
events. DPAM graph representations show the feedback loop is indeed
disabled and low-power states can be reached.
Signed-off-by: Dharageswari R <dharageswari.r@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200625191308.3322-8-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
94d2d08974