[alsa-devel] [PATCH] ASoC: fsl_sai: mark regmap as fast_io

[Mark Brown]

On Wed, Jul 17, 2019 at 12:51:56PM +0200, Lucas Stach wrote:

> The regmap is only ever used to access MMIO registers, so it's fair
> to say that register access is fast.

Are you sure there's no caches that try to do allocations at
runtime?  The main thing fast_io does is change the locking to
spinlocks which means we shouldn't do any allocations under lock,
such as when updating the cache.
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