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

[Annaliese McDermond]

> On Mar 19, 2019, at 8:37 AM, Mark Brown <broonie at kernel.org> wrote:
> 
> On Mon, Mar 18, 2019 at 08:37:55PM -0700, Annaliese McDermond wrote:
>> Different processing blocks are required for different sampling
>> rates and power parameters.  Set the processing blocks based
>> on this information.
> 
> Is this another bug fix or does it depend on the rest of the series
> somehow?

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.

--
Annaliese McDermond
nh6z at nh6z.net