ASoC: tlv320aic31xx: Add support for loading filter coefficients

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The TLV320DAC3100 Audio DAC has 25 built-in digital audio processing blocks
(PRBs). Each of these PRBs has a static filter structure with programmable
coefficients. Once a PRB is selected for use by the DAC, its filter
coefficients can be configured via a dedicated set of registers.

Define a new optional firmware which can be loaded by the TLV320DAC driver.
This firmware describes a full set of filter coefficients for all blocks
used by the various PRBs.

The firmware's binary format is heavily inspired by the one used in the
peb2466 driver. It includes a version marker to allow for potential
evolutions of the format.

Note that adaptive filtering is not supported i.e. filter coefficients are
loaded once before power-on and then cannot be changed while the DAC is
powered. This is why only page A coefficients are modified. Page B
coefficients are only used for adaptive filtering.

Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
Link: https://patch.msgid.link/20240906-tlv320-filter-v1-1-6955f53ff435@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Romain Gantois 2024-09-06 14:20:58 +02:00 • committed by Mark Brown

parent 241c044e74

commit 77b696f489

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sound/soc/codecs/tlv320aic31xx.c

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