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 --- sound/soc/codecs/tlv320aic31xx.c | 100 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+)

diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c index 2f94cfda0e33..7e624c4b77b6 100644 --- a/sound/soc/codecs/tlv320aic31xx.c +++ b/sound/soc/codecs/tlv320aic31xx.c @@ -12,6 +12,7 @@ * and mono/stereo Class-D speaker driver. */

+#include <asm/unaligned.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> @@ -22,6 +23,7 @@ #include <linux/gpio/consumer.h> #include <linux/regulator/consumer.h> #include <linux/acpi.h> +#include <linux/firmware.h> #include <linux/of.h> #include <linux/slab.h> #include <sound/core.h> @@ -1638,6 +1640,98 @@ static const struct i2c_device_id aic31xx_i2c_id[] = { }; MODULE_DEVICE_TABLE(i2c, aic31xx_i2c_id);

+static int tlv320dac3100_fw_load(struct aic31xx_priv *aic31xx, + const u8 *data, size_t size) +{ + int ret, reg; + u16 val16; + + /* + * Coefficients firmware binary structure. Multi-byte values are big-endian. + * + * @0, 16bits: Magic (0xB30C) + * @2, 16bits: Version (0x0100 for version 1.0) + * @4, 8bits: DAC Processing Block Selection + * @5, 62 16-bit values: Page 8 buffer A DAC programmable filter coefficients + * @129, 12 16-bit values: Page 9 Buffer A DAC programmable filter coefficients + * + * Filter coefficients are interpreted as two's complement values + * ranging from -32 768 to 32 767. For more details on filter coefficients, + * please refer to the TLV320DAC3100 datasheet, tables 6-120 and 6-123. + */ + + if (size != 153) { + dev_err(aic31xx->dev, "firmware size is %zu, expected 153 bytes\n", size); + return -EINVAL; + } + + /* Check magic */ + val16 = get_unaligned_be16(data); + if (val16 != 0xb30c) { + dev_err(aic31xx->dev, "fw magic is 0x%04x expected 0xb30c\n", val16); + return -EINVAL; + } + data += 2; + + /* Check version */ + val16 = get_unaligned_be16(data); + if (val16 != 0x0100) { + dev_err(aic31xx->dev, "invalid firmware version 0x%04x! expected 1", val16); + return -EINVAL; + } + data += 2; + + ret = regmap_write(aic31xx->regmap, AIC31XX_DACPRB, *data); + if (ret) { + dev_err(aic31xx->dev, "failed to write PRB index: err %d\n", ret); + return ret; + } + data += 1; + + /* Page 8 Buffer A coefficients */ + for (reg = 2; reg < 126; reg++) { + ret = regmap_write(aic31xx->regmap, AIC31XX_REG(8, reg), *data); + if (ret) { + dev_err(aic31xx->dev, + "failed to write page 8 filter coefficient %d: err %d\n", reg, ret); + return ret; + } + data++; + } + + /* Page 9 Buffer A coefficients */ + for (reg = 2; reg < 26; reg++) { + ret = regmap_write(aic31xx->regmap, AIC31XX_REG(9, reg), *data); + if (ret) { + dev_err(aic31xx->dev, + "failed to write page 9 filter coefficient %d: err %d\n", reg, ret); + return ret; + } + data++; + } + + dev_info(aic31xx->dev, "done loading DAC filter coefficients\n"); + + return ret; +} + +static int tlv320dac3100_load_coeffs(struct aic31xx_priv *aic31xx, + const char *fw_name) +{ + const struct firmware *fw; + int ret; + + ret = request_firmware(&fw, fw_name, aic31xx->dev); + if (ret) + return ret; + + ret = tlv320dac3100_fw_load(aic31xx, fw->data, fw->size); + + release_firmware(fw); + + return ret; +} + static int aic31xx_i2c_probe(struct i2c_client *i2c) { struct aic31xx_priv *aic31xx; @@ -1727,6 +1821,12 @@ static int aic31xx_i2c_probe(struct i2c_client *i2c) } }

+ if (aic31xx->codec_type == DAC3100) { + ret = tlv320dac3100_load_coeffs(aic31xx, "tlv320dac3100-coeffs.bin"); + if (ret) + dev_warn(aic31xx->dev, "Did not load any filter coefficients\n"); + } + if (aic31xx->codec_type & DAC31XX_BIT) return devm_snd_soc_register_component(&i2c->dev, &soc_codec_driver_aic31xx,

--- base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b change-id: 20240806-tlv320-filter-189edd66496c

Best regards,