From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shawn Guo <shawn.guo@freescale.com>
Subject: Re: [PATCH] ASoC: fsl_ssi: Add suspend/resume support
Date: Fri, 23 May 2014 17:18:21 +0800
Message-ID: <20140523091820.GB2650@dragon>
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To: Fabio Estevam <festevam@gmail.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>, alsa-devel@alsa-project.org, broonie@kernel.org, timur@tabi.org
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On Fri, May 23, 2014 at 02:38:56AM -0300, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@freescale.com>
> 
> Doing a suspend/resume sequence while playing an audio track in the backgroung
> causes broken audio right after resume:
> 
> root@freescale /$ aplay clarinet.wav &
> 
> root@freescale /home$ Playing WAVE 'clarinet.wav' : Signed 16 bit Little Endian,
>  Rate 44100 Hz, Mono
> 
> root@freescale /home$ echo mem > /sys/power/state 
> PM: Syncing filesystems ... done.
> Freezing user space processes ... (elapsed 0.002 seconds) done.
> Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
> Suspending console(s) (use no_console_suspend to debug)
> PM: suspend of devices complete after 37.082 msecs
> PM: suspend devices took 0.040 seconds
> PM: late suspend of devices complete after 4.234 msecs
> PM: noirq suspend of devices complete after 4.618 msecs
> Disabling non-boot CPUs ...
> PM: noirq resume of devices complete after 4.013 msecs
> PM: early resume of devices complete after 4.000 msecs
> PM: resume of devices complete after 68.907 msecs
> PM: resume devices took 0.070 seconds
> Restarting tasks ... Suspended. Trying resume. Failed. Restarting stream. Done.
> Suspended. Trying resume. Failed. Restarting stream. Done.
> Suspended. Trying resume. Failed. Restarting stream. Done.
> Suspended. Trying resume. Failed. Restarting stream. Done.
> Suspended. Trying resume. Failed. Restarting stream. Done.
> Suspended. Trying resume. Failed. Restarting stream. Done.
> Suspended. Trying resume. Failed. Restarting stream. Done.
> ....
> 
> Add SNDRV_PCM_TRIGGER_RESUME/SUSPEND cases so that we can gracefully handle
> system suspend/resume.
> 
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

Acked-by: Shawn Guo <shawn.guo@freescale.com>