[alsa-devel] [PATCH] ALSA: core: Allow drivers to set R/W wait time.

[Liam Girdwood]

On Thu, 2018-03-15 at 15:30 +0100, Takashi Iwai wrote:
> > It's not atm, as it was being set by the driver. Would probably mean an ABI
> > change to PCM ops or a new ioctl ? The latter wont break the ABI and the
> > default
> > value would remain if the ioctl was not called.
> 
> Basically this timeout is merely for a safety, wasn't considered as a
> part of the real functionality.
> 
> So, with your plan, this is exposed as a real PCM feature, as a part
> of API?  For what kind of scenario / purpose?

Use case is XRUN handling, DMA failure or FW crash detection. The shortened
timeout means we can recover far faster leaving a smaller gap in any audio.

Liam