[alsa-devel] [PATCH v2 1/2] ASoC: core: Add flag to ignore pmdown_time at pcm_close

Nallasellan, Singaravelan singaravelan.nallasellan at intel.com
Fri Oct 21 22:24:23 CEST 2011

Agree. System integrator may not like to delay closing modem ports for 6 seconds either. Need to close the ports immediately or delay. 
Do you suggest that we shouldn't delay in the driver and introduce delay in the user pace?
I prefer to remove the delay altogether from the driver. Do you see any issue which might cause glitches?

-----Original Message-----
From: Mark Brown [mailto:broonie at opensource.wolfsonmicro.com] 
Sent: Friday, October 21, 2011 12:42 PM
To: Nallasellan, Singaravelan
Cc: Babu, Ramesh; Peter Ujfalusi; alsa-devel at alsa-project.org; Liam Girdwood; Misael Lopez Cruz
Subject: Re: [alsa-devel] [PATCH v2 1/2] ASoC: core: Add flag to ignore pmdown_time at pcm_close

On Fri, Oct 21, 2011 at 10:31:40PM +0530, Nallasellan, Singaravelan wrote:

Fix your mailer to word wrap within paragraphs and don't top post when posting to public mailing lists.

> I think the requirement is to delay the power down the link during the 
> music playback. There is a possibility that next song will start 
> playing sooner. In this case, try to avoid power down and power up the 
> DAI immediately. In case of voice call, it is not expected to have 
> voice call immediately after a call. It can be closed. Phone stack can 
> go ahead and close the modem path but codec path will still be open.
> This will cause glitches.

You can't decide this on the basis of the DAI, though - the system integrator may have thought of another use for the DAI.

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