On Tue, 12 Jan 2010 21:35:15 +0530 "Aggarwal, Anuj" anuj.aggarwal@ti.com wrote:
I want to check the status of suspend/resume functionality when audio subsystem is being used. Specifically, has some one tried the following tests on their omap3 based platforms:
a) echo mem > /sys/power/state, when audio playback is running in background b) same command, when audio capture is running in background b) same command, when audio loopback is running in background
I am facing some issues with (b) & (c) so wanted to confirm whether someone else has faced similar problem or not.
Unfortunately the proper OMAP ASoC suspend/resume functionality is still missing and the development progress has been slow. There are few issues in low-level McBSP code like proper clock management, context save/restore, how to deal with the FIFO, etc. and those should be addressed first.
Fortunately Janusz Krzysztofik has been cleaning up and developing the register cache support in McBSP and that work could help the PM work as well. Clock management changes don't look complicated but just requires that one develops it.
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-November/023119.ht...