[alsa-devel] [PATCH v5] ASoC: add RT286 CODEC driver

[Mark Brown]

On Thu, Mar 13, 2014 at 09:04:49PM +0100, Takashi Iwai wrote:
> Mark Brown wrote:

> > We don't really *need* the cache, it just makes it easier to do resume
> > and gives a bit of a performance boost.

> Well, the caching isn't just a bit.  Without caching, you'd have to
> whip the sound hardware powered up/down at each time querying the
> current mixer value.

Realistically most hardware can't actually do that - there's a couple of
the idle_bias_off devices that have built in LDOs which can but it's
relatively unusual to be able to remove enough power to loose register
I/O (and in any case you wind up needing to cache the values per control
or something in order to do system suspend).
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