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

[Zidan Wang]

On Fri, Aug 21, 2015 at 12:47:37AM -0700, Nicolin Chen wrote:
> On Tue, Aug 18, 2015 at 10:01:54AM +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.
> 
> > The runtime suspend function will be call after the power down time. So if i
> > playback again before the power down time, runtime suspend will not be called.
> 
> I see.. Can you provide me a test case to reproduce this issue?

1. aplay -Dhw:0 /unit_tests/audio8k16S.wav
2. ctrl+c

Set SAI to master mode, then try it several times.

Best Regards,
Zidan Wang