On Tue, Oct 4, 2022 at 12:46 PM Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com wrote:
On 10/4/22 11:07 AM, Daniel Baluta wrote:
Hello all,
It looks like system suspend is not implemented for Compress streams.
Any story behind this? Were there any attempts on implementing this?
It depends on the definition of 'system suspend'.
What we had in mind back in the early 2010s was to allow for 'active suspend' aka S0ix or low-power playback. That was the main reason for introducing the API.
For suspend to S3/D3, the plan was to just completely stop any playback/capture and restart on resume. I am not sure if this was ever implemented, that may be a miss.
I see. Yes, we are looking at S3/D3 suspend and this doesn't look to be implemented.
There is a corner case we may have overlooked. I am not sure what happens if the S3/D3 suspend while playing. This is supported with e.g. aplay but for the compressed case it's a bit more complicated. Not all formats support rendering for a random position.
True. We want to implement the same behavior as for aplay. Stop any playback/capture and restart on resume.
Thanks!