[alsa-devel] [PATCH 4/4] ASoC: firmware core: Add core support to create and destroy firmware components.

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Nov 21 12:52:31 CET 2012

On Wed, Nov 21, 2012 at 11:16:18AM +0000, Liam Girdwood wrote:
> On 21/11/12 10:37, Mark Brown wrote:

> >Right, but the decision we took at the ASoC conference and have been
> >implementing was to move away from that to just letting applications set
> >the binary blob to change the enumeration value instead and then putting
> >the management of multiple names for the blobs into userspace.

> Ok, this is fine and works well for larger or multiple blobs that
> will be frequently changed at runtime depending on use case.
> However, the ABE coefficients here (around 400 bytes per EQU) are
> only loaded once at boot (where the number and graph positions of
> the EQUs is tightly coupled to the FW) and are not unloaded. The
> simplification here is that we dont have to write any new userspace
> code to manage the ABE EQUs and treat them as regular alsamixer
> controls which makes the integration and testing easier in this
> case.

That's the case for essentially all blobs right now (nobody got round to
fixing the ABI limit of 512 bytes!).  Are we saying we want to use this
infrastructure for all blobs?  If that's the case then we definitely
need to support multiple files per device...
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