[alsa-devel] [PATCH] ASoC: fsl_sai: fix no frame clk in master mode

[Nicolin Chen]

On Wed, Aug 12, 2015 at 03:59:15PM +0800, Zidan Wang wrote:
> On Tue, Aug 11, 2015 at 08:53:25PM -0700, Nicolin Chen wrote:
> > On Wed, Aug 12, 2015 at 10:25:45AM +0800, Zidan Wang wrote:
> > > After several open/close sai test with ctrl+c, there will be I/O error.
> > > The SAI can't work anymore, can't recover. There will be no frame clock.
> > > With adding the software reset in trigger stop, the issue can be fixed.
> > 
> > It doesn't look like a decent fix to me. Is it the only fix that
> > IC team suggests? And why put this reset in the trigger function.
> > Your MEGA fast patch has already included a software reset in the
> > PM runtime functions. When dealing with CTRL+C test cases, that
> > software reset should have worked as well.
> > 
> The MEGA fast patch add the suspend/resume function, but CTRL+C will not trigger suspend/resume function.
> When CTRL+C, it will trigger stop and software reset SAI.
> IC team suggest us to rest it, but I don't know if it's the only fix.

You can try to add SET_RUNTIME_PM_OPS() and to see if the suspend
function is called right after pressing ctrl+c.