[alsa-devel] [PATCH 12/13] ASoC: tlv320aic32x4: Propery Set Processing Blocks

[Mark Brown]

On Tue, Mar 19, 2019 at 09:24:00AM -0700, Annaliese McDermond wrote:

> It’s not really a bug fix.  The codec has a variety of “processing blocks”
> that enable different filters (there’s an onboard FIR, Biquad, etc.) and
> such.  The big thing they change with regard to how the driver is written
> now is that they change the decimation filter used.  The documentation
> specifies to use certain filters for certain sample rates.  This
> hasn’t mattered very much in the past because the default filters
> (P1 and R1) are the ones recommended for 48kHz and below.  This is
> particularly important for 192kHz operation because it won’t
> work with P1 and R1.  So, it’s not really a bug fix.  It’s part
> of the road to enabling 192kHz operation.

It does sound like a bug fix for higher sample rates (96kHz is
supported?) even if it's a fairly niche case.
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